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자료유형
학술저널
저자정보
저널정보
한국차학회 한국차학회지 한국차학회지 제21권
발행연도
2015.1
수록면
252 - 258 (7page)

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The worldwide consumption of tea is second only to water. Thus any health effects of drinking tea could have a significant impact on public health. Although tea has historically been thought to promote good health, research into the possible health benefits of tea is more recent. Tea polysaccharides sources show various important biological activities together with proteins and polynucleotides, such as anti-blood coagulation, anti-radiation, antioxidant, reducing blood sugar levels, hypoglycemic activities, anti-HIV, anti-cancer, cell-cell communication, cell adhesion and molecular recognition in the immune system, which are strongly affected by their chemical structures and chain conformations. In recent years, some tea polysaccharides sources have attracted much attention in the field of biochemistry and pharmacology. Observational studies have repeatedly shown that tea polysaccharides were mostly glycoconjugates in which a protein carries one or more carbohydrate chains covalently associated with a polypeptide backbone, usually some forms of via N- or O-linkages. It is interesting and important to elucidate the relation among chemical structures, chain conformations of tea polysaccharides and their biological activities. However, tea polysaccharides are usually composed of various monosaccharides linked with different glucosidic bonds. Some tea polysaccharides have hyperbranched structures. Moreover, tea polysaccharides often have high molecular weights, and tend to form aggregates in solution that can mask the behavior of individual macromolecules. In consequence, to characterize the chemical structures and chain conformations of polysaccharides is not an easy task. To make clear the chemical structures and chain conformations of tea polysaccharides is important to understand their biological activities. This article attempts to review the current development on structural and conformational characterization of some tea polysaccharides. In this paper, the various aspects of the investigation results of tea polysaccharides chemical structures in the recent decades were summarized. The chemical structures were analyzed by FTIR, NMR (one and two dimensions), CD and AFM, and so on.

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