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Polymeric Proanthocyanidins from Psidium guajava

School of Pharmacy, The University of Petra, P.O.Box: 961343, Amman, Jordan
lnstitut für Pharmazeutische Biologie und Phytochemie, Hittorfstrasse 56, 48149 Münster, Germany
Author to whom correspondence should be addressed.
Sci. Pharm. 2005, 73(3), 113-125;
Received: 10 October 2004 / Accepted: 20 May 2005 / Published: 30 September 2005


From the aqueous acetone extract of the leaves of Psidium guajava L. the flavanols catechin and gallocatechin, the procyanidins B1, B2, B3 and two prodelphinidins (gallocatechin - (4α→8) - catechin; gallocatechin - (4α→8) - gallo-catechin) were isolated. A more abundant proanthocyanidin polymer was also isolated, purified and its chemical constitution studied by 13C-NMR and phloroglucinol degradation. The mean molecular weight of the polymer was estimated to be about 9 to 10 flavan-3-ol-units with a ratio of procyanidin: prodelphinidin units at 2 : 1 some of which are derivatized by gallic acid.
Keywords: Psidium guajava; Myrtaceae; proanthocyanidins; phloroglucinol degradation Psidium guajava; Myrtaceae; proanthocyanidins; phloroglucinol degradation

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MDPI and ACS Style

Qa'dan, F.; Petereit, F.; Nahrstedt, A. Polymeric Proanthocyanidins from Psidium guajava. Sci. Pharm. 2005, 73, 113-125.

AMA Style

Qa'dan F, Petereit F, Nahrstedt A. Polymeric Proanthocyanidins from Psidium guajava. Scientia Pharmaceutica. 2005; 73(3):113-125.

Chicago/Turabian Style

Qa'dan, Fadi, Frank Petereit, and Adolf Nahrstedt. 2005. "Polymeric Proanthocyanidins from Psidium guajava" Scientia Pharmaceutica 73, no. 3: 113-125.

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