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2013-01-01 - Article/Dans un journal avec peer-review - Anglais - 7 page(s)

Giang Trung Khoa, Nguyen Thanh Hai, Ngo Xuan Manh, Nguyen Thi Bich Thuy, Pham Duc Nghia, Nguyen Thi Oanh, Phan Thu Huong, Duez Pierre , "Effects of raw material types on the chemical composition of Trung du tea variety (Camellia sinensis var. sinensis)" in Journal of Science and Development, 11, 3, 373-379

  • Edition : Hanoi University of Agriculture, Hanoi (Vietnam)
  • Codes CREF : Chimie analytique (DI1314), Pharmacognosie (DI3410), Sciences pharmaceutiques (DI3400)
  • Unités de recherche UMONS : Chimie thérapeutique et Pharmacognosie (M136)
  • Instituts UMONS : Institut des Sciences et Technologies de la Santé (Santé)
Texte intégral :

Abstract(s) :

(Anglais) The chemical composition of the four raw material types of Trung du tea variety has been identified (a bud with three leaves, B type, C type and old tea leaves). The results indicated that the moisture content, soluble substance, total catechin content, cafein and total polyphenol content significantly varied with the raw material type. The younger the material is, the higher the levels of these components are, and vice versa. In the sample materials, the total polyphenol content ranges from 13.23% dry matter (DM) to 21.73% DM, cafein content from 2.06% DM to 4.68%DM, and the total catechin content from 10.80% DM to 15.93% DM. With regard to catechins, the following relationship was observed: EGCG>EGC>ECG>EC>C. Contents of EGCG and ECG increase from the old leaves to the bud with three leaves. In contrast, EGC content reduces from the old leaves to the bud with three leaves.