Proanthocyanidin B2 is a B type proanthocyanidin

B type proanthocyanidin

B type proanthocyanidins are a specific type of proanthocyanidin, which are a class of flavanoids. They are oligomers of flavan-3-ols.-Dimeric B type proanthoanthocyanidins :...

 ((−)-Epicatechin-(4β→8)-(−)-epicatechin).

Proanthocyanidin B2 can be found in Cinchona pubescens

Cinchona pubescens

Cinchona pubescens is known for its bark's high quinine content- and has similar uses to Cinchona officinalis in the production of quinine, most famously used for treatment of malaria . Its native range spans Costa Rica, Venezuela, Ecuador, Peru and Bolivia. In Ecuador, C...

(Chinchona, in the rind, bark and cortex), in Cinnamomum verum

Cinnamomum verum

Cinnamomum verum, called "true cinnamon", Ceylon cinnamon or Sri Lanka cinnamon is a small evergreen tree belonging to the family Lauraceae, native to Sri Lanka...

(Ceylon cinnamon, in the rind, bark and cortex), in Crataegus monogyna (Common hawthorn, in the flower and blossom), in Uncaria guianensis

Uncaria guianensis

Uncaria guianensis, the cat's claw, is a plant species in the genus Uncaria found in Guyana. Other names for the plant include Garabato, Garabato Amarillo, Garabato Colorado, Hawk's Claw, Life-giving vine of Peru, Paraguayo, Samento, Saventaro, Tambor huasca, Una de Gato, and Una de Gavilan.U...

(Cat's claw, in the root), in Vitis vinifera

Vitis vinifera

Vitis vinifera is a species of Vitis, native to the Mediterranean region, central Europe, and southwestern Asia, from Morocco and Portugal north to southern Germany and east to northern Iran....

(Common grape vine, in the leaf), in Litchi chinensis (litchi, in the pericarp), in the apple

Apple

The apple is the pomaceous fruit of the apple tree, species Malus domestica in the rose family . It is one of the most widely cultivated tree fruits, and the most widely known of the many members of genus Malus that are used by humans. Apple grow on small, deciduous trees that blossom in the spring...

, and in Ecdysanthera utilis

Ecdysanthera utilis

Ecdysanthera utilis is a plant species in the genus Ecdysanthera. It is a shrub found in Taïwan where it is used in folk medicine as an analgesic, antiphlogistic and spasmolytic agent....

.

Proanthocyanidin B2 has been shown to inhibit the formation of the advanced glycation end-products pentosidine

Pentosidine

Pentosidine is a biomarker for advanced glycation endproducts, or AGEs. It is a well characterized and easily detected member of this large class of compounds.-Background:...

, carboxymethyllysine

N(6)-carboxymethyllysine

N-Carboxymethyllysine , also known as N-lysine, is an advanced glycation endproduct . CML has been the most used marker for AGEs in food analysis....

 (CML), and methylglyoxal

Methylglyoxal

Methylglyoxal, also called pyruvaldehyde or 2-oxopropanal is the aldehyde form of pyruvic acid. It has two carbonyl groups, so it is a dicarbonyl compound. Methylglyoxal is both an aldehyde and a ketone....

 (MGO).