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Variatio. in Catechin Co.po.itio. o. Po.ularly Cultivated Tea Clo.es in East Africa (Kenya)

American Jo.rnal o. Plant Sciences 2013年第3期4卷 628-640页

作者： Leo.ida Chero.ich Samso. M. Kamunya Amo. Alako.ya So.o.o. W. Mso.ba Marie A. Uwimana Jo.n K. Wanyo.o.phillip o. owuor Department o. Chemistry Maseno University Maseno Kenya Institute o. Bio.echno.o.y Research (IBR) Jomo Kenyatta University of Agriculture and Technology Nairobi Kenya o.fice Des Cultures Industrielles du Rwanda The’ (o.IR The’) Kigali Rwanda Tea Research Fo.ndatio. o. Kenya Kericho Kenya Tea Research Institute o. Tanzania Dar Es Salaam Tanzania

Tea po.ypheno.s and catechins have gained pro.inence in determinatio. o. tea quality. Tea leaves co.tain large amo.nts o. catechins and their derivatives and these have sho.n po.itive effects o. human health. An experiment was carried o.t to.determine the level o. catechins and po.ypheno.s in 20 new clo.es fo.nd in two.distinct tea gro.ing areas. The trial co.prising twenty clo.es was established in two.distinct sites in Kenya using rando.ized co.plete blo.k design with three replicates and co.sisted o. 10 po.ular cultivars widely cultivated in the Lake Victo.ia Basin and additio.al 10 newly impro.ed clo.es. Tea leaf samples were co.lected acro.s two.seaso.s;dry and wet seaso.s. Tea quality parameters entailing catechins, caffeine and to.al po.ypheno.s was generated fo. the 20 clo.es acro.s the two.seaso.s and sites. The ISo.14502-1 and ISo.14502-1:2005 pro.edures were used fo. po.ypheno. and catechin analyses, respectively. The ANo.A results generated indicated that the level o. catechins and po.ypheno.s in tea were significantly different (p 0.05) and varietal dependent. Generally, the assam varieties had higher levels o. catechins and po.ypheno.s than the chinary and cambo. varieties, indicating why they are po.ularly cultivated in the East African regio. and who.e tea quality is highly regarded. Furthermo.e, the results fro. principle co.po.ent analysis (PCA) gro.ped the clo.es into.three majo. clusters with o.e co.prising o. high quality assam varieties, a mixture o. mo.erate quality assam, cambo. and chinary varieties and lo. catechin co.tent assam antho.yanin-rich variety. It is co.cluded that the level o. catechins in tea plants are varietal dependent, altho.gh enviro.mental stress has effects o. the synthesis o. flavano.ds. The results demo.strated that the differences in the accumulatio. o. catechins amo.g the tea clo.es co.ld be impo.tant fo. the discriminatio. o. clo.al diversity.

关键词： Tea Health Camellia sinensis Catechins Variatio. Kenya

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