The effects of diet on people's health are various and can be expressed through the skin from inside to outside. Eat right, good skin; eat wrong, it hurts. 10 kinds of skin care foods A few days ago, an American magazine published an article listing 11 skin-healthy foods summarized by dermatologists. Experts pointed out that eating these foods helps skin health. 1. Romaine lettuce. 6 lettuce leaves can provide 1 day of vitamin A, which can promote cell metabolism. In addition, the potassium in lettuce can promote blood circulation and allow the skin to get more nutrients. 2. Tomatoes. Lycopene in tomatoes protects the collagen in the skin from peeling off. German research found that lycopene helps smooth wrinkles and makes skin smooth and delicate. Eat tomatoes are not easy to appear dark circles. 3. Strawberry. Vitamin C in strawberries promotes the production of collagen fibers, making the skin smooth and elastic. 4. Apple. The antioxidant quercetin in apple peel protects the skin from UVA. Therefore, in addition to sunscreen, you may wish to eat another apple before going out in the sun. 5. Soybeans. The study found that women in their 30s and 40s often eat lobster sauce (enriched with soy isoflavone aglycone), which helps to improve skin relaxation. 6. Eggs. Studies have found that eggs are rich in lutein and zeaxanthin, which can increase the body's ability to resist ultraviolet light by four times. 7. Almonds. Eating a handful of almonds daily can increase vitamin E levels. Vitamin E can inhibit skin aging and prevent pigmentation. 8. Walnuts. Walnut is rich in alpha linolenic acid, which nourishes the skin and maintains its elasticity. 9. Dark chocolate. Fat in cocoa can promote blood circulation. The study found that drinking a half cup of a cocoa-beverage-rich cocoa drink (including dark chocolate) for 12 consecutive weeks can make the skin softer, smoother, and more moisturized. 10. Premium virgin olive oil. A study found that essential fatty acids (EFAs) contained in healthy virgin olive oil help prevent UV damage to the skin and help moisturize the skin. The body cannot synthesize EFAs, so it is best to consume 1 tablespoon of olive oil daily. Whole grain food. The antioxidants in bread and other cereals play an important role in protecting the skin. Natural antioxidants in the human body will decrease with age, and therefore must be replenished through diet.
Plant extraction process
1. Select plants/herbs. No more than ancient prescriptions, prescriptions, folk herbs to find. At present, common and uncommon herbs have been studied. At present, it is mostly to increase the amount of medicinal materials to extract and separate components with low content, or to find medicinal plants that have never been studied from miao medicine, Tibetan medicine, Mongolian medicine, Africa, Latin America and other places.
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2. The extraction. Solvent petroleum ether, n-hexane, cyclohexane, benzene, chloroform, ethyl acetate, n-butanol, acetone, ethanol, methanol, water (low polarity → high polarity). Daily medicine decoction effective, water and ethanol and other solvents with large polarity, such as artemisinin boiling ineffective extraction with petroleum ether and other solvents with small polarity. Common medicinal materials water/alcohol/ether to go through, separation and identification of more compounds.
3. The separation. This is the most important work. In the solution extracted from the second step, there are dozens of compounds, usually by column chromatography, which is often referred to as the column flushing. It's a lot of work, it's boring, it's low tech. A master's student might do this every day for two years. The column for separating compounds, as shown below, is as large as 2 meters high and as small as 10 centimeters. Change the solvent condition of mobile phase, change the material of column, different conditions and different separation principles of column repeatedly punching, can be separated from the monomer compound.