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|Section2= |Section3= }} Procyanidin A2 is a A type proanthocyanidin. It can be found in horse chestnut (''Aesculus hippocastanum''), in cranberry juice concentrate, in peanut〔 skins in ''Cinchona cinchona'' and ''Cinchona pubescens'' rind, bark and cortex, in ''Cinnamomum verum'' (Ceylon cinnamon) rind, bark and cortex, in the fruit of ''Persea americana'' (avocado or alligator pear),〔(Proanthocyanidin-A-2 on liberherbarum.com )〕 in ''Urvillea ulmaceae'', and in ''Ecdysanthera utilis''. == Synthesis == Procyanidin B2 can be converted into procyanidin A2 by radical oxidation using 1,1-diphenyl-2-picrylhydrazyl (DPPH) radicals under neutral conditions.〔Conversion of procyanidin B-type (catechin dimer) to A-type: evidence for abstraction of C-2 hydrogen in catechin during radical oxidation. Kazunari Kondo, Masaaki Kurihara, Kiyoshi Fukuhara, Takashi Tanaka, Takashi Suzuki, Naoki Miyata and Masatake Toyoda, Tetrahedron Letters, 22 January 2000, Volume 41, Issue 4, Pages 485–488, 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Procyanidin A2」の詳細全文を読む スポンサード リンク
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