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Actinidain (EC 3.4.22.14, actinidin, Actinidia anionic protease, proteinase A2 of Actinidia chinensis) is a type of cysteine protease enzyme found in fruits including kiwifruit (genus Actinidia), pineapple, mango, banana, figs, and papaya. This enzyme is part of the peptidase C1 family of papain-like proteases. [1] [2] [3] [4]
It has a characteristic reddish-purple color, though this can change with pH; solutions of the compound are red at pH < 3, violet at pH 7-8, and blue at pH > 11. In certain fruits, the highest concentrations of cyanidin are found in the seeds and skin. [citation needed] Cyanidin has been found to be a potent sirtuin 6 (SIRT6) activator. [2] [3]
Anthocyanins may be used as pH indicators because their color changes with pH; they are red or pink in acidic solutions (pH < 7), purple in neutral solutions (pH ≈ 7), greenish-yellow in alkaline solutions (pH > 7), and colorless in very alkaline solutions, where the pigment is completely reduced. [57]
Delphinidin (also delphinidine [1] [2]) is an anthocyanidin, a primary plant pigment, and also an antioxidant. [3] Delphinidin gives blue hues to flowers in the genera Viola and Delphinium . It also gives the blue-red color of the grape variety Cabernet Sauvignon , and can be found in cranberries and Concord grapes as well as pomegranates , [ 4 ...
Hesperidin is a flavanone glycoside found in citrus fruits. Its aglycone is hesperetin.Its name is derived from the word "hesperidium", for fruit produced by citrus trees. ...
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The name comes from the French term acide ellagique, from the word galle spelled backward [1] because it can be obtained from noix de galle , and to distinguish it from acide gallique (gallic acid). The molecule structure resembles to that of two gallic acid molecules being assembled "head to tail" and bound together by a C–C bond (as in ...