Angoal's Black Soybean Skin Extract is extracted from the natural black soybean hull with grain alcohol solution. It is soluble in water and ethanol. It contains lots of Anthocyanins which is efficient antioxidant. Cyanidin-3-glucoside is the main active ingredient in Anthocyanins. It can be used as health food additive or natural color. It shows pink in acid solution, purplish-red in neutral solution and blue-black in alkaline solution.
Synonyms: Black Soybean Skin Extract, Black Bean Extract, Glycine soja Extract, Semen Glycine Extract, Anthocyanosides, Anthocyanins, Cyanidin-3-glucoside
Molecular Structure of Cyanidin-3-glucoside:

Molecular Formula: C21H21ClO11
Molecular Weight: 484.84
CAS No.: 7084-24-4
Specifications:
Botanical Origin: Glycine soja Sieb. - Black Soybean Hull
Appearance: Purple powder
Odor & Taste: Characteristic odor and taste
Mesh Size: 90% Min. through 80 mesh
Assay: Anthocyanins 10% Min. (UV)
Moisture: 5.0% Max.
Heavy Metals: 10ppm Max.
Arsenic (As): 2ppm Max.
Total Aerobic Count: 1,000cfu/g Max.
Yeast & Mold: 100cfu/g Max.
E. coli: Negative
Salmonella: Negative
Packing: 25kgs/Fibre drum, two plastic-bags inside
Storage: Stored in a well-closed container away from moisture and light
Shelf Life: Two years