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|Section2= }} Procyanidin A1 is a A type proanthocyanidin dimer. It is an epicatechin-(2β→7,4β→8)-catechin dimer found in ''Rhododendron spiciferum'', in peanut skins and in ''Ecdysanthera utilis''. Procyanidin B1 can be converted into procyanidin A1 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, 〕 == References == 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 A1」の詳細全文を読む スポンサード リンク
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