comparative assessment of copper, iron, and zinc contents in selected indian (assam) and south african (thohoyandou) tea (camellia sinensis l.) samples and their infusion: a quest for health risks to consumer.the current study aims to assess the infusion pattern of three important micronutrients namely copper (cu), iron (fe), and zinc (zn) contents from black tea samples produced in assam (india) and thohoyandou (south africa). average daily intakes and hazardous quotient were reported for these micronutrients. total content for cu, fe, and zn varied from 2.25 to 48.82 mg kg(-1), 14.75 to 148.18 mg kg(-1), and 28.48 to 106.68 mg kg(-1), respectively. the average contents of each of the three micronut ...201727339254
specific fluctuations in the composition of lipoxygenase- and glycosidase-generated flavors in some cultivated teas of assam.variations of fatty acid compositions, glycosides precursors, and lipoxygenase and glycosidase enzymatic activities were used simultaneously to differentiate for nine genetically different cultivated teas, four seasonal changes, and the affect of leaf maturity. the muscatel flavor of second-flush teas was associated with increased activities of glycosidase and several terpenes, phenolics, and aliphatic compounds bound to glycosides, whereas high levels of fatty acids and lipoxygenase activity bi ...200212475290
diversity of catechin in northeast indian tea cultivars.tea (camellia sinensis l.) leaf contains a large amount of catechins (a group of very active flavonoids) which contribute to major quality attributes of black tea. based on morphological characters tea plants were classified as assam, china, and cambod varieties. the present study is an attempt for biochemical fingerprinting of the tea varieties based on catechin composition in green leaf of cultivars grown in northeast india. assam variety cultivars contained the highest level of catechins foll ...201222448135
polyphenolic compounds and antioxidant activity of ctc black tea of north-east india.sixty black tea samples from different agro climatic zones of northeast india were assessed for biochemical constituents that determine quality and also influence organoleptic perception. the antioxidant activities such as α,α-diphenyl-β-picrylhydrazyl (dpph) free radical scavenging, lipid peroxidation inhibition, nitrite scavenging and super oxide scavenging, of the collected samples were analysed. out of the four antioxidant activities, the super oxide scavenging activity was lowest and nitrit ...201323993544
indications for three independent domestication events for the tea plant (camellia sinensis (l.) o. kuntze) and new insights into the origin of tea germplasm in china and india revealed by nuclear microsatellites.tea is the world's most popular non-alcoholic beverage. china and india are known to be the largest tea producing countries and recognized as the centers for the domestication of the tea plant (camellia sinensis (l.) o. kuntze). however, molecular studies on the origin, domestication and relationships of the main teas, china type, assam type and cambod type are lacking.201627218820
diversity among various forms of catechins and its synthesizing enzyme (phenylalanine ammonia lyase) in relation to quality of black tea (camellia spp.).quality of tea depends on the cultivar and climatic conditions. biochemical pathways within the plant and climatic factors can result in noticeable changes in chemical composition, which determine the quality of tea. black tea quality attributes are influenced by various forms of catechins, namely gallated, non-gallated, dihydroxylated and trihydroxylated catechins and their ratios. hence the variations in grouped catechins and their synthesizing enzyme in relation to quality of south indian bla ...201020549808
catechin and catechin fractions as biochemical markers to study the diversity of indian tea (camellia sinensis (l.) o. kuntze) germplasm.the heterogeneous indian tea germplasm includes 'china', 'assam', 'cambod', and their hybrids which were evaluated using biochemical markers viz., total catechin and their fractions, for varietal identification and characterization. principal component analysis (pca) of biochemical characters showed that the total catechin and trihydroxylated catechin has higher eigenvalues. the first two principal components (pcs) could differentiate more than 90% of the clones studied. this grouping based on f ...200919623550
genetic diversity of upasi tea clones (camellia sinensis (l.) o. kuntze) on the basis of total catechins and their fractions.tea leaf catechins and the ratio of dihydroxylated to trihydroxylated catechin fractions were analysed to identify the genetic diversity of 26 upasi released tea clones. principal component analysis (pca) based on regression factor separated tea clones into five groups according to their jats (jats are region based rays for e.g., assam, china and cambod origin) as well as their quality constituents (such as total polyphenols, total catechins, amino acids in the green leaves and liquor characteri ...200515721948
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