◆ Different chemical structure
Anthocyanins are flavonoid compounds widely found in plants in nature; (flavonoids refer to derivatives of flavonoids) Proanthocyanidins are polyphenolic compounds formed by the condensation of flavan-3-ol monomers and their polymers (polyphenol-like compounds are derivatives of polyphenolic compounds), usually composed of catechins and epicatechins. Two kinds of proanthocyanidin monomers are composed; proanthocyanidins are also called proanthocyanidins.
◆ Different plants exist
Anthocyanins are widely found in fruits and vegetables such as blueberries, cherries, strawberries, grapes, black beans, and purple potatoes;
Proanthocyanidins are widely found in the skin, shells and seeds of plants, such as grape seeds, apple peels, pine bark, ginkgo leaves, and black rice seeds.
◆ Different effects
Although anthocyanins and proanthocyanidins have antioxidant effects to remove free radicals, proanthocyanidins are much more antioxidant than anthocyanins.
◆ Different colors
Anthocyanin is a water-soluble pigment that is one of the main pigments that make up the color of petals and fruits. It can change color with the acidity and alkalinity of cell fluid.
Proanthocyanidins are generally reddish brown powder;
◆ Difference 5: Material conversion
Proanthocyanidins are heated in an acidic medium to produce anthocyanins, so they are called proanthocyanidins. However, anthocyanins cannot be converted into proanthocyanidins, and this process cannot be reversed.
Anthocyanins: a class of compounds in which anthocyanins + sugars are combined by glycosidic bonds. In plants, anthocyanins are mostly present in the form of anthocyanins.