| metal-organic framework-199/graphite oxide hybrid composites coated solid-phase microextraction fibers coupled with gas chromatography for determination of organochlorine pesticides from complicated samples. | the hybrid material of a copper-based metal-organic framework (mof-199) and graphite oxide (go) was explored as the solid-phase microextraction (spme) coating for the first time. this fiber was fabricated by using 3-amino-propyltriethoxysilane (aptes) as the cross-linking agent, which enhanced its durability and allowed more than 140 replicate extractions. with the incorporation of go, the mof-199/go fibers with go contents ranging from 5 to 15 wt% exhibited enhanced adsorption affinity to organ ... | 2013 | 24054558 |
| solution properties and in vitro anti-tumor activities of polysaccharides from longan pulp. | the solution properties of four fractions (lpi-iv) from crude longan pulp polysaccharides (lp3) were analyzed by size-exclusion chromatography combined with laser light scattering, viscometry, complex formation with congo red, and atomic force microscopy. their radii of gyration <s²>(z)(½) were 43.3, 62.6, 43.2 and 77.3 nm, exponents of <s²>(z)(½) = k m(w)(v) were 0.04, 0.50, 0.52 and 0.02, and intrinsic viscosities ([η]) were 9.945, 25.38, 308.2 and 452.1 ml/g, respectively. moreover, the depen ... | 2013 | 24051475 |
| analysis of the global transcriptome of longan (dimocarpus longan lour.) embryogenic callus using illumina paired-end sequencing. | longan is a tropical/subtropical fruit tree of great economic importance in southeast asia. progress in understanding molecular mechanisms of longan embryogenesis, which is the primary influence on fruit quality and yield, is slowed by lack of transcriptomic and genomic information. illumina second generation sequencing, which is suitable for generating enormous numbers of transcript sequences that can be used for functional genomic analysis of longan. | 2013 | 23957614 |
| molecular characterization of high plant species using pcr with primers designed from consensus branch point signal sequences. | a novel method is introduced for producing molecular markers in plants using single 15- to 18-mer pcr primers designed from the short conserved consensus branch point signal sequences and standard agarose gel electrophoresis. this method was tested on cultivated peanut and verified to give good fingerprinting results in other plant species (mango, banana, and longan). these single primers, designed from relatively conserved branch point signal sequences within gene introns, should be universal a ... | 2011 | 21264505 |
| isolation and characterization of flowering locus t subforms and apetala1 of the subtropical fruit tree dimocarpus longan. | longan (dimocarpus longan lour.) is a subtropical evergreen fruit tree, mainly cultivated in asia. two putative floral integrator genes, d. longan flowering locus t1 and 2 (dlft1 and dlft2) were isolated and both translated sequences revealed a high homology to ft sequences from other plants. moreover, two apetala1-like (dlap1-1 and dlap1-2) sequences from longan were isolated and characterized. results indicate that the sequences of these genes are highly conserved, suggesting functions in the ... | 2013 | 23954797 |
| morphology and volatile compounds of metathoracic scent gland in tessaratoma papillosa (drury) (hemiptera: tessaratomidae). | tessaratoma papillosa (drury) (hemiptera: tessaratomidae) is a serious insect pest of litchi and longan in south china. when disturbed, this insect could release large quantities of disagreeable odorous volatiles from its scent gland. knowledge on the scent gland and its secretion is crucial for developing the semiochemical methods to manage this pest. morphology and ultrastructure of the metathoracic scent glands (mtgs) were studied under stereo and scanning electron microscopy, and the volatil ... | 2012 | 23950062 |
| evaluation of physicochemical and antioxidant properties of sourwood and other malaysian honeys: a comparison with manuka honey. | the aim of the present study was to evaluate the physical, biochemical and antioxidant properties of four malaysian monofloral types of honey (gelam, longan, rubber tree and sourwood honeys) compared to manuka honey. several physical parameters of honey, such as ph, moisture content, electrical conductivity (ec), total dissolved solids (tds), color intensity, total sugar and sucrose content, were measured. a number of biochemical and antioxidant tests were performed to determine the antioxidant ... | 2013 | 23938192 |
| inhibitory effects of water extract from longan twigs on mutation and nitric oxide production. | this study examines the inhibitory effects of water extract from longan twigs (wlts) on mutation and nitric oxide (no) production. the results show that wlt inhibited the mutagenicity of 2-aminoanthracene (2-aa), an indirect mutagen, and 4-nitroquinoline-n-oxide (4-nqo), a direct mutagen toward salmonella typhimurium ta 98 and ta 100. in addition, wlt in the range 0-0.6 mg/ml showed radical scavenging, reducing activities and chelating activity, as well as decreased lipid oxidative damage. meanw ... | 2012 | 22868111 |
| isolation and characterization of ellagitannins as the major polyphenolic components of longan (dimocarpus longan lour) seeds. | longan (dimocarpus longan lour, syn. euphoria longan lam.) represents an important fruit in northern thailand and has significant economic impact. the fruit is either consumed fresh or as commercially prepared dried and canned products. the canning industry in thailand produces considerable quantities of waste products, in particular longan seeds. because these seeds may be an exploitable source of natural phenolic antioxidants, it was of interest to identify, purify and quantitate the major pot ... | 2012 | 22277734 |
| comparison of dynamic viscoelastic and physicochemical properties of pressurised and pasteurised longan juices with xanthan addition. | physical and biochemical properties of pressurised and pasteurised longan juices with various xanthan additions, such as viscoelastic behaviour, colour l (lightness), -a(*) (greenness), b(*) (yellowness), δe (total different colours) and bi (browning index) parameters, polyphenol oxidase (ppo) activity, ascorbic acid, gallic acid, ellagic acid, total phenols and antioxidant capacity (dpph assay) were studied. viscoelastic determination indicated that longan juice with 0.15% xanthan addition was ... | 2012 | 23442674 |
| inhibitory effects of propyl gallate on tyrosinase and its application in controlling pericarp browning of harvested longan fruits. | tyrosinase (ec 1.14.18.1), also known as polyphenol oxidase (ppo), is a key enzyme in pigment biosynthesis of organisms. the inhibitory effects of propyl gallate on the activity of mushroom tyrosinase and effects of propyl gallate on pericarp browning of harvested longan fruits in relation to phenolic metabolism were investigated. the results showed that propyl gallate could potently inhibit diphenolase activity of tyrosinase. the inhibitor concentration leading to 50% activity lost (ic50) was d ... | 2013 | 23427826 |
| structural characteristics and antioxidant activities of polysaccharides from longan seed. | ultrasound-assisted extraction was employed to extract polysaccharides from longan seed (lsp), with aids of a box-behnken statistical design to investigate the effects of ultrasonic power, time and liquid/solid ratio on the extraction recovery of the lsp. the structural analysis indicated that arabinose, galactose, glucose and mannose were major components of lsp, with →6)-gal-(→1, glc-(→1 and →6)-glc-(1→ glycosidic linkages. in an in vitro antioxidant activity of the 1,1-diphenyl-2-picryldydraz ... | 2013 | 23218364 |
| floral reversion mechanism in longan (dimocarpus longan lour.) revealed by proteomic and anatomic analyses. | two-dimensional gel electrophoresis (2-de) was used to analyze the proteins related to floral reversion in dimocarpus longan lour. proteins were extracted from buds undergoing the normal process of flowering and from those undergoing floral reversion in three developing stages in d. longan. differentially expressed proteins were identified from the gels after 2-de analysis, which were confirmed using matrix-assisted laser desorption/ionization-time of flying-mass spectroscopy and protein databas ... | 2012 | 22100459 |
| role of hydroxyl radical in modification of cell wall polysaccharides and aril breakdown during senescence of harvested longan fruit. | the effects of reactive oxygen species (ros), especially hydroxyl radical (oh), on cellular wall disassembly in vitro and in vivo, and aril breakdown in longan fruit, were investigated. oh caused the disassembly of cell wall material (cwm) in vitro, demonstrated by the increases of total sugars and uronic acid released, and the downshift in molecular mass of cdta soluble pectin (csp) and na2co3 soluble pectin (co3-sp). in addition, oh resulted in decreased co3-sp content and increased csp conten ... | 2011 | 25214349 |
| two gh3 genes from longan are differentially regulated during fruit growth and development. | in the present work, two full length cdnas of gh3 genes, named dlgh3.1 and dlgh3.2 were cloned from pericarp and aril tissues of the longan fruit, respectively. three conserved motifs, ssgtsagerk, yasse and yrvgd, as a characteristic of the acyladenylate/thioester forming enzyme superfamily were observed in dlgh3.1 and dlgh3.2 proteins. dlgh3.1 mainly expressed in pericarp tissues while dlgh3.2 accumulated in both the pericarp and aril tissues during fruit growth and development. in addition, na ... | 2011 | 21672614 |
| investigation of plant hormone level changes in shoot tips of longan (dimocarpus longan lour.) treated with potassium chlorate by liquid chromatography-electrospray ionization mass spectrometry. | the endogenous levels of indole-3-acetic acid (iaa), gibberellins (gas), abscisic acid (aba) and cytokinins (cks) and their changes were investigated in shoot tips of ten longan (dimocarpus longan lour.) trees for off-season flowering until 60 days after potassium chlorate treatment in comparison with those of ten control (untreated) longan trees. these analytes were extracted and interfering matrices removed with a single mixed-mode solid phase extraction under optimum conditions. the recoverie ... | 2011 | 21726716 |
| [svm-based qualitative analysis of muscat hamburg wine produced in tianjin region]. | the purpose was to achieve the identification of muscat hamburg wines produced in tianjin region through scanning and analyzing dry white wine samples of different grape varieties and regions by infrared spectroscopy technology. a support vector machine (svm) based method was introduced to analyze infrared spectra of dry white wines. the pretreatment processes of the ir spectra were also elaborated, including baseline adjustment, noise elimination, standard normalization and eliminating the main ... | 2011 | 21428068 |
| [the effect evaluation of a new tuberculosis management model in rural areas of guangxi]. | to explore the effect of new model for tuberculosis (tb) control and management, and provide a scientific basis and justification for making tb control strategies in rural communities. | 2011 | 21418816 |
| comparison on characterization of longan (dimocarpus longan lour.) polyphenoloxidase using endogenous and exogenous substrates. | longan polyphenoloxidase (ppo) was extracted and partially purified using ammonium sulfate precipitation and dialysis. the ppo characterizations were compared using endogenous substrate (-)-epicatechin and exogenous substrate catechol. the optimal ph and optimal temperature for the ppo activity were different when reacting with both substrates. the addition of ethylenediaminetetraacetic acid disodium salt into both substrate-enzyme systems exhibited the same lowest inhibition of the ppo activity ... | 2010 | 20718432 |
| a comparative identification of ochratoxin a in longan fruit pulp by high performance liquid chromatography-fluorescence detection and electron spray ionization-mass spectrometry. | harvested longan (dimocarpus longan lour.) fruit are susceptible to decay caused by both bacterial and fungal infections. ochratoxin a (ota) is a kind of mycotoxin produced by a number of fungi. in this study, ota was extracted from longan fruit pulp by 80% methanol and then loaded on c-18 solid-phase extraction columns. the extract solution was then analyzed by high-performance liquid chromatography - fluorescence detection (hplc-fd) and an electron spray ionization-mass spectrometry (esi-ms), ... | 2010 | 20335938 |
| control of rotting and browning of longan fruit cv. biew kiew after harvested by sulphur dioxide treatment under various storage temperatures. | the experiment of longan fruit cv. biew kiew, untreated (control) and treated with so2 treatment were stored under 2 +/- 2 and 7 +/- 2 degrees c for 0, 2, 4, 6 and 8 weeks were studied. the treatment of fresh longan fruit with so2 fumigation combined with the suitable storage condition improved the overall longan fruit quality, especially on inner and outer peel tissue and aril color than no so2 treatment. treatment stabilizes peel color with no subsequent loss of color during storage (fruit col ... | 2009 | 20180317 |
| [changes in cell wall components and cell wall-degrading enzyme activities of postharvest longan fruit during aril breakdown]. | longan (dimocarpus longan lour.) fruits are very susceptible to pericarp browning and aril breakdown, and postharvest aril breakdown is one of the most important factors degrading the quality and shorting storage life of longan fruit. changes in aril breakdown index, cell wall components and cell wall-degrading enzyme activities in aril of longan cv. fuyan fruits using sealed polyethylene film bags (0.015 mm thick) at (10+/-1) degrees c were investigated. the main results were as follows. develo ... | 2007 | 17452799 |
| [the extraction and identification of total flavanone from longan pericarp]. | in order to make use of the resources of total flavanone in pericarp of longan. | 2006 | 17076235 |
| longan shell as novel biomacromolecular sorbent for highly selective removal of lead and mercury ions. | strongly selective adsorbability of natural longan (euphoria longan) shell as a biomacromolecular sorbent toward heavy metal ions from aqueous solutions has been discovered and successfully optimized by facilely controlling the shell dosage, sorption time, ph value, and ion concentration. the sorption well-fits the langmuir isotherm and obeys the pseudo-second-order kinetics. the maximum adsorptivity of pb(ii) and hg(ii) is 99.3 and 99.1%, respectively, with short equilibrium sorption time. the ... | 2010 | 20175512 |
| a new natural lactone from dimocarpus longan lour. seeds. | a new natural product named longanlactone was isolated from dimocarpus longan lour. seeds. its structure was determined as 3-(2-acetyl-1h--pyrrol-1-yl)-5-(prop-2-yn-1-yl)dihydrofuran-2(3h)-one by spectroscopic methods and hresims. | 2012 | 22869162 |
| use of the bcr sequential extraction procedure for the study of metal availability to plants. | to investigate the mobility and availability of metals from soil to plant, concentrations of zinc (zn), copper (cu), lead (pb), cadmium (cd), mercury (hg) and arsenic (as) in topsoils and plants (lettuce, scallion, celery, tomato, carambola, wampee and longan) collected from the area around a petrochemical complex in guangzhou, china, were analyzed. the modified european community bureau of reference (bcr) three-step sequential extraction procedure was applied to determine the concentration of m ... | 2010 | 20145888 |
| structural identification of (1→6)-α-d-glucan, a key responsible for the health benefits of longan, and evaluation of anticancer activity. | longan is a delicious subtropical fruit with great health-beneficial effects. it has been utilized for disease prevention and health care since ancient age. to explore the chemicals responsible for the health benefits, water-soluble polysaccharides were extracted from longan flesh in this work. a pure polysaccharide (lps1) was obtained through column purification. analysis by gas chromatography showed lps1 was a homopolysaccharide of glucose with glycosidic linkage of →6)-d-glc-(1→. nuclear magn ... | 2013 | 23617585 |
| identification and quantification of polyphenolic compounds in longan (euphoria longana lam.) fruit. | regular consumption of fruit and vegetables is associated with a lower risk of some chronic diseases including various forms of cancer and cardiovascular diseases. the health-promoting potential of these foods may be due, in part, to the phytochemical bioactive compounds present in the plants. fruit of euphoria longana lam. (longan) are consumed throughout asia and are a major crop in thailand. in the present study phytochemicals were extracted with 70% methanol from peel, pulp, and seed tissues ... | 2005 | 15740011 |
| comparative analysis reveals dynamic changes in mirnas and their targets and expression during somatic embryogenesis in longan (dimocarpus longan lour.). | somatic embryogenesis (se), which resembles zygotic embryogenesis, is an essential component of the process of plant cell differentiation and embryo development. although micrornas (mirnas) are important regulators of many plant develop- mental processes, their roles in se have not been thoroughly investigated. in this study, we used deep-sequencing, computational, and qpcr methods to identify, profile, and describe conserved and novel mirnas involved in longan (dimocarpus longan) se. a total of ... | 2013 | 23593197 |
| comparative proteomic analysis of longan (dimocarpus longan lour.) seed abortion. | two-dimensional gel electrophoresis (2-de), coupled with mass spectroscopy, was used to study seed abortion in dimocarpus longan lour. (cv. minjiao 64-1) by comparing normal and aborted seeds at three developmental stages. more than 1,000 protein spots were reproducibly detected in 2-de gels, with 43 protein spots being significantly altered in their intensity between normal and aborted seeds at least at one stage. thirty-five proteins were identified by matrix-assisted laser desorption ionizati ... | 2010 | 20049611 |
| inhibitory effects of dried longan (euphoria longana lam.) seed extract on invasion and matrix metalloproteinases of colon cancer cells. | the critical step in colorectal cancer progression and associated mortality is cancer invasion, which depends on two key gelatinase enzymes, matrix metalloproteinases-2 and -9. dried longan ( euphoria longana lam.) seed is a rich natural source of antioxidant polyphenols.this study evaluated the effect of dried longan seeds on colon cancer cell invasion via gelatinase function and expression. three dried longan seed fractions were collected by sephadex lh-20 column chromatography. they showed a ... | 2013 | 23527961 |
| evaluation of suitable reference genes for normalization of microrna expression by real-time reverse transcription pcr analysis during longan somatic embryogenesis. | accurate profiling of micrornas (mirnas) is an essential step for understanding both developmental and physiological functions of mirnas. real-time quantitative pcr (qpcr) is being widely used in mirna expression studies, but choosing a suitable reference gene is a crucial factor for correct analysis of results. to date, there has been no systematic evaluation of qpcr reference genes for the study of mirnas during somatic embryogenesis (se) in the longan tree (dimocarpus longan). here, the most ... | 2013 | 23454294 |
| hot water immersion to ensure quarantine security for cryptophlebia spp. (lepidoptera: tortricidae) in lychee and longan exported from hawaii. | we determined whether immersion in 49 degrees c water for 20 min, a quarantine treatment developed for disinfestation of fruit flies in lychee, litchi chinensis sonn., and longan, dimocarpus longan (lourd.) steud., exported from hawaii, would also disinfest fruit of two species of cryptophlebia. the pattern of tolerance to heat in cryptophlebia illepida (butler) was generally eggs < neonates < early instars = late instars < pupae. no c. illepida survived immersion for 16 or 20 min. late fourth a ... | 2001 | 11681696 |
| structural characteristics and antioxidant activities of oligosaccharides from longan fruit pericarp. | ultrasonic assisted extraction was employed to extract oligosaccharides from longan fruit pericarp (olfp). a box-behnken design was applied to investigate the effects of ultrasonic temperature (30-70 degrees c), power (120-300 w), and time (10-50 min) on olfp recovery. the model showed a good agreement with the experimental results on the basis of r(2) of 0.9655 and p-value <0.05. from response surface plots, ultrasonic power, time, and temperature exhibited independent and interactive effects o ... | 2009 | 19739643 |
| enhanced antioxidant and antityrosinase activities of longan fruit pericarp by ultra-high-pressure-assisted extraction. | the health benefits of fruits acting against chronic diseases are ascribed to their antioxidant activities which are mainly responsible due to the presence of phenolic compounds. the use of ultra-high-pressure-assisted extraction (uhpe) has shown great advantages for the extraction of these phenolic compounds from longan fruit pericarp (lfp). studies were carried out to investigate the effects of uhpe at pressures of 200, 300, 400 and 500 mpa on total phenolic contents, extraction yield, antioxi ... | 2010 | 19345542 |
| a novel stopped flow injection-amperometric procedure for the determination of chlorate. | a novel stopped flow injection-amperometric (sfi-amp) procedure for determination of chlorate has been developed. the reaction of chlorate with excess potassium iodide and hydrochloric acid, forming iodine/triiodide that is further electrochemically reduced at a glassy carbon electrode at +200mv versus ag/agcl electrode is employed. in order to increase sensitivity without using of too high acid concentration, promoting of the reaction by increasing reaction time and temperature can be carried o ... | 2005 | 18970344 |
| antioxidant and anti-inflammatory properties of longan (dimocarpus longan lour.) pericarp. | this study examined the antioxidant and anti-inflammatory activities of the water extract of longan pericarp (wlp). the results showed that wlp exhibited radical scavenging, reducing activity and liposome protection activity. in addition, wlp also inhibited lipopolysaccharide (lps)-induced nitric oxide (no) production in macrophages. further, administration of wlp, in the range of 100-400 mg/kg, showed a concentration-dependent inhibition on paw edema development following carrageenan (carr) tre ... | 2012 | 22966244 |
| longan seed extract reduces hyperuricemia via modulating urate transporters and suppressing xanthine oxidase activity. | hyperuricemia causes gouty arthritis, kidney disease, heart disease, and other diseases. xanthine oxidase (xod) and urate transporters play important roles in urate homeostasis. numerous plants have been identified as xod inhibitors. longan seeds are known to contain high levels of polyphenols such as corilagin, gallic acid and ellagic acid. we examined the effect of longan seed extract on xod inhibition and urate transporters glut1 and glut9 using both in vitro and in vivo assays. the results s ... | 2012 | 22928829 |
| neuroprotective effects of longan ( dimocarpus longan lour.) flower water extract on mpp+-induced neurotoxicity in rat brain. | in this study, the neuroprotective effect of dimocarpus longan lour. flower water extract (lfwe) was investigated. first, an in vitro study showed that lfwe concentration-dependently inhibited lipid peroxidation of brain homogenates incubated at 37 °c. the antioxidative activity of lfwe was more potent than that of glutathione or trolox. furthermore, an ex vivo study found that the basal lipid peroxidation (0 °c) and lipid peroxidation incubated at 37 °c were lower in the brain homogenates of lf ... | 2012 | 22920583 |
| safety evaluation of longan seed extract: acute and repeated oral administration. | longan seed extract (lse) contains high levels of beneficial polyphenolic compounds. the present study evaluated acute and repeated dose (4 and 13 weeks) toxicological effects of aqueous extract of longan seed to ensure the safety of utilization of this extract. our study revealed that all treated animals survived through the whole experimental periods without adverse effects observed in either sex of animals after acute and repeated dose (4 and 13 weeks) oral administration of lse. likewise, gr ... | 2012 | 22902805 |
| potential roles of longan flower and seed extracts for anti-cancer. | polyphenol-rich plants are known to possess benefits to human health. recent studies have revealed that many traditional chinese medicines (tcms) are rich sources of polyphenols and exhibit antioxidant and anti-inflammatory activities, and these tcms have been shown experimentally to overcome some chronic diseases, including cancer. longan flowers and seeds, two tcms traditionally used for relieving pain and urinary diseases, have been revealed in our recent reports and other studies to possess ... | 2012 | 24520538 |
| effects of activated sludge on the degradation of chlorate in soils under varying environmental conditions. | incubation experiments were conducted to examine the effects of activated sludge on degradation of chlorate in soils. the results show that application of activated sludge could significantly promote the decomposition of soil chlorate though the degradation rate of chlorate did not necessarily increase with increasing application rate of the sludge. the effectiveness of activated sludge on soil chlorate degradation was significantly affected by temperature, moisture content and ph. there is a te ... | 2009 | 18621481 |
| toxic effects of chlorate on three plant species inoculated with arbuscular mycorrhizal fungi. | pot experiments were conducted to examine the toxic effects of chlorate on bermudagrass, bahiagrass, and longan seedling with a focus on arbuscular mycorrhizal fungi-plant associations. the results show that application of chlorate could cause slight soil acidification, but the resulting ph was still around 5.5, which is unlikely to adversely affect plant growth. increase in the application rate of chlorate resulted in a decrease in colonization rate of arbuscular mycorrhizal fungi in plant root ... | 2008 | 18602693 |
| suppressive effect of a proanthocyanidin-rich extract from longan (dimocarpus longan lour.) flowers on nitric oxide production in lps-stimulated macrophage cells. | anthocyanidins found in certain flowers have been shown to act as strong antioxidants in various systems, exhibiting multiple biological actions. the antioxidative effects of water extract and ethanolic extract of longan (dimocarpus longan lour.) flowers were evaluated by radical scavenging activity and compared to those of gallic acid, myricetin, and epigallocatechin gallate. in this study, the suppressive effects of longan flower extracts on nitric oxide and prostaglandin e2 production were in ... | 2007 | 18052097 |
| hot-water immersion quarantine treatment against mediterranean fruit fly and oriental fruit fly (diptera: tephritidae) eggs and larvae in litchi and longan fruit exported from hawaii. | immersion of litchi fruit in 49 degrees c water for 20 min followed by hydrocooling in ambient (24 +/- 4 degrees c) temperature water for 20 min was tested as a quarantine treatment against potential infestations of mediterranean fruit fly, ceratitis capitata (wiedemann); and oriental fruit fly, bactrocera dorsalis hendel, eggs or larvae in hawaiian litchi, litchi chinensis sonnerat. the 49 degrees c hot-water immersion of litchi provided probit 9 (99.9968% mortality with >95% confidence) quaran ... | 2007 | 17849856 |
| identification of two polyphenolic compounds with antioxidant activities in longan pericarp tissues. | longan fruits contain a significant amount of polyphenols. in the present study, polyphenols were extracted from longan pericarp tissues, and then two representative polyphenols were separated and purified by polyamide column chromatography, sephadex lh-20 column chromatography, and silica gel column chromatography. on the basis of 1h nmr, 13c nmr, and electrospray ionization mass spectrometric (esi-ms) data, the two compounds were identified as 4-o-methylgallic acid and (-)-epicatechin, respect ... | 2007 | 17579438 |
| a case of food allergy due to longan fruit. | | 2007 | 17458440 |
| evaluation of free radical scavenging and antityrosinase activities of standardized longan fruit extract. | the protective effects of fruits and vegetables against chronic diseases have been attributed to the antioxidant properties of some secondary metabolites present in these foods. plant polyphenols have been reported to exhibit bioactive properties, and in particular antioxidant activities. longan seeds are found to contain high levels of some beneficial polyphenolic compounds such as corilagin, gallic acid and ellagic acid. the present study examined the free radical scavenging activity of longan ... | 2007 | 17049706 |
| mode of grasp, materials, and grooved chopstick tip on gripping performance and evaluation. | this study evaluated the effects of the mode of grasping, chopstick materials, and the groove of the chopstick-tip on gripping performance of 32 participants, among whom 16 were accustomed to using chopsticks with a pliers-grasping mode and the other 16 with a scissors-grasping mode. based on a random sequence, 8 kinds of chopsticks with different combinations (materials: bamboo, wood, plastic, and stainless steel, with and without grooves in the chopstick-tip) were used to carry out the action ... | 2006 | 16671604 |
| [roles of olfaction and vision in orientation behavior of adult campylomma chinensis schuh (hemiptera: miridae) toward lantana plants (verbanaceae)]. | investigations were carried out on the orientation behavior of adult campylomma chinensis schuh (hemiptera: miridae) toward plant hosts lantana camara, l. caniara cv. 'flava', and l. montevidensis (spreng. ) briq. (verbanaceae). surveys on three lantana plants showed that the distribution of c. chinensis in inflorescences was not related to floral color (partial correlation coefficient was 0.240, p = 0. 147, n = 40), but to the number of thrips hawiiensis morgan (partial correlation coefficient ... | 2005 | 16252876 |
| isolation and structure elucidation of phenolic compounds from longan (dimocarpus longan lour.) seed by high-performance liquid chromatography-electrospray ionization mass spectrometry. | high-performance liquid chromatography coupled with electrospray ionization mass spectrometry (hplc-esi-ms) analysis revealed the phenolics profile of longan (dimocarpus longan lour.) seed. gallic acid, ellagic acid, monogalloyl-glucose, monogalloyl-diglucose, digalloyl-diglucose, penta- to heptagalloyl-glucose, ellagic acid-pentose conjugate, galloyl-hhdp (hexahydroxydiphenoyl)-glucopyranose, pentagalloy-hhdp-glucopyranose, procyanidin a-type dimer, procyanidin b2 and quercetin-3-o-rhamnoside w ... | 2005 | 16106708 |
| development, characterization and variability analysis of microsatellites in lychee (litchi chinensis sonn., sapindaceae). | we report 12 microsatellites enriched in ct repeats obtained from a genomic library of the lychee ( litchi chinensis sonn.) cultivar mauritius. the polymorphisms revealed by these microsatellites were evaluated in a collection of 21 lychee cultivars. a total of 59 fragments were detected with these 12 ssrs, with an average of 4.9 bands/ssr. three primer pairs seem to amplify more than a single locus. the mean expected and observed heterozygosities over the 9 single-locus ssrs averaged 0.571 (ran ... | 2004 | 14605809 |
| assessment of hydroxyl radical generation and radical scavenging activity of chinese medicinal herbs using gc-ms. | aqueous extracts of ten chinese herbs were evaluated for their radical scavenging activity by a gc-ms method based on the fenton reaction system. hydroxylation of salicylate and phenylalanine is widely used as an index of hydroxyl radical formation in vivo and in vitro. a problem associated with quantifying product from such reactions is the generation of complex reaction products that increase background 'noise' and reduce sensitivity for the target product. the aim of this investigation was to ... | 2003 | 14599346 |
| cerebrosides from longan arillus. | from the pulp of euphoria longana (longan arillus), three cerebroside molecular species have been isolated. six known cerebrosides, soyacerebrosides i and ii, 1-o-beta-d-glucopyranosyl-(2s,3r,4e,8e)-2-(2'-lignoceroylamino)-4,8-octadecadiene-1,3-diol (longan cerebroside i) and its 8z isomer (longan cerebroside ii), momor-cerebroside i, and phytolacca cerebroside, were identified as major components of these cerebroside molecular species. all the cerebrosides were shown to be a mixture of geometri ... | 2003 | 12643590 |
| differential effects of foods traditionally regarded as 'heating' and 'cooling' on prostaglandin e(2) production by a macrophage cell line. | some components of natural foods may enhance or inhibit prostaglandin formation and potentially affect the inflammation condition. a macrophage cell line, raw264.7, was employed to examine the effects of foods traditionally regarded as 'heating' or 'cooling' on the production of pge(2), a well-known proinflammatory mediator. foods traditionally regarded as 'heating' (litchi, longan, and dried longan) or 'cooling' (chrysanthemum flower, bitter gourd, and lotus seed plumule) were extracted sequent ... | 2016 | 12432225 |
| adenosine, the anxiolytic-like principle of the arillus of euphoria longana. | according to traditional usage, the extract of longan arillus was tested for its anxiolytic-like effect by application of the vogel-type anti-conflict method in mice. the extract indicated significant activity at a dose of 2 g/kg, s.c., and results of the bioassay-oriented isolation revealed adenosine to be the active principle. adenosine produced the anti-conflict effect significantly at a dose of 30 mg/kg, s.c. adenine, uridine, and 5-methyluridine did not exhibit the effect, although these co ... | 1999 | 10193200 |
| [pharmacologic effects of an extract of arillus longan (lour.) steud. and gecko]. | alg is an extract from arillus longan and gecko. our experiment has shown that alg ig 20 ml/kg/d x 10 elevates significantly tolerance in mice under low and high temperatures and anoxia, and also increases the body-weight of normal mice, while alg ig 15 ml/kg/d x 14 protects body-weight from decreasing in reserpinized mice. an increase in spleen-weight has also been observed in normal mice with alg ig 20 ml/kg/d x 7, and alg ig 15 ml/kg/d x 10 elevates the clearance rate of iv charcoal particles ... | 1989 | 2511863 |
| optimization of tyrosinase inhibition activity of ultrasonic-extracted polysaccharides from longan fruit pericarp. | various ultrasonic conditions were employed to prepare polysaccharides from longan fruit pericarp (plfp) and the lineweaver-burk equation was then used to determine the effect of plfp on inhibition of tyrosinase activity. this result showed that plfp acted as a non-competitive inhibitor of tyrosinase. the highest slope was observed for ultrasonic extraction, followed by the hot-water extraction, suggesting that the ultrasonic treatment of plfp increased the inhibition of tyrosinase activity. fur ... | 2008 | 26049219 |
| antioxidant activity, ascorbic acid and total phenol of exotic fruits occurring in brazil. | the antioxidant activity, ascorbic acid and phenolic content were studied in 10 exotic fruits from brazil: abiu, acerola, wax jambu, cashew, mamey sapote, carambola or star fruit, surinam cherry, longan, sapodilla and jaboticaba. the ascorbic acid was determined by 2,6-dichloroindophenol titrimetic methods and total phenols were measured colorimetrically using the folin-ciocalteu reagent. the antioxidant activity was investigated with three different methods: hypochlorous acid scavenging activit ... | 2009 | 18785051 |