10. Phytochemicals Zeyuan Deng.

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Presentation transcript:

10. Phytochemicals Zeyuan Deng

Herbals and botanicals are supplements that contain extracts or active ingredients from the roots, berries, seeds, stems, leaves, buds芽 or flowers of plants. It is a common misconception that supplements made from plants are safe because they are "natural" or "organic".

Classification of phytochemicals According to the chemical structures and functional characteristics, the phytochemicals are classified into: carotinoids, phytosterols植物甾醇类, saponins皂角苷, glucosinolates芥子油甙, polyphenols, monoterpenes单萜, Phyto-oestrogens雌激素, sulphides硫化物, lectins植物血凝素

1) Flavonoids Flavonoids are a group of polyphenolic compounds diverse in chemical structure and characteristics. They occur naturally in fruit, vegetables, nuts, seeds, flowers, and bark and are an integral part of the human diet.

The Generic structure of flavonoids

2) Ginkgo biloba银杏树 Ginkgo biloba is an extract from the leaves of the Ginkgo tree, also known as the Maidenhair tree. The Ginkgo is the oldest living tree species on earth and has been used medicinally by the Chinese for some 4,000 years.

3) St. John's Wort St. John's Wort is an extract from the herb tops and flowers of the Hypericum perforatum金丝桃属植物 plant and it is thought that it was first used in Greek and Roman times.

4) Echinacea金花菊 Echinacea, also known as purple coneflower金花菊 or snakeroot蛇根草, is a prairie (草原) flower native to central North America.

5) Garlic Garlic, or Allium sativum, has been cultivated for thousands of years for its therapeutic benefits. Garlic was used as a treatment for tumors, headaches, weakness and fatigue, wounds, sores and infections. It was regarded as a physically enhancing tonic滋补品, and was used by the first Olympic athletes as an energizer. The active ingredient is allicin. 蒜素

6) Ginseng Ginseng is the most famous Asian herb. Various forms of ginseng have been used in medicine for more than 7,000 years.