[Latin Name] Hypericum perforatum

[Plant Source] From China

[Appearance] Brown fine powder

[Specifications] 0.3% Hypericin

[Particle size] 80 Mesh

[Loss on drying] ≤5.0%

[Heavy Metal] ≤10PPM

[Pesticide residue] EC396-2005, USP 34, EP 8.0, FDA

[Storage] Store in cool & dry area, keep away from the direct light and heat.

[Package] Packed in paper-drums and two plastic-bags inside.

[What is St. John's wort]

St. John’s wort (Hypericum perforatum) has a history of use as a medicine dating back to ancient Greece, where it was used for a range of illnesses, including various nervous disorders. St. John’s wort also has antibacterial, antioxidant, and antiviral properties. Because of its anti-inflammatory properties, it has been applied to the skin to help heal wounds and burns. St. John’s wort is one of the most commonly purchased herbal products in the United States.

In recent years, St. John’s wort has been studied extensively as a treatment for depression. Most studies show that St. John’s wort may help treat mild-to-moderate depression, and has fewer side effects than most other prescription antidepressants.

[Functions]

1. Anti-depressive and sedative properties;

2. Effective remedy for the nervous system, relaxing tension, and anxiety and lifting the spirits;

3. Anti-inflammatory

4. Improve capillary circulation

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Moof’s Medical Biochemistry Video Course: https://moof-university.thinkific.com/courses/medical-biochemistry-for-usmle-step-1-exam

For Related Practice Problems with Worked Video Solutions on Carbohydrates, visit courses.moofuniversity.com.

In this video, I depict and describe some key disaccharides and polysaccharides that any and every biochemistry student should be familiar with.

Maltose is a disaccharide with two glucose molecules connected by an alpha-1,4-glycosidic bond. Maltose is a reducing sugar because it has a free anomeric OH group.
Lactose is a disaccharide with a galactose and a glucose connected by a beta-1,4-glycosidic bond. Lactose is a reducing sugar because it has a free anomeric OH group.
Sucrose is a disaccharide with a glucose and a fructose connected by an alpha,beta-1,2-glycosidic bond. Sucrose is not a reducing sugar because it does not have a free anomeric OH group.

Cellulose is a polysaccharide with a bunch of glucose molecules connected by beta-1,4-linkages.
Starch and glycogen are both polysaccharides with a bunch of glucose molecules connected by alpha-1,4-linkages. Glycogen is more highly branched.

Humans have the enzyme to digest alpha-1,4-linkages, not beta-1,4-linkages. That’s why we can digest starch and glycogen, but not cellulose.

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