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Studies of chemical modification and formation of colon targeted microparticulates of Pachyman


Liu, T and Narkowicz, CK and Jacobson, GA and Hu, X, Studies of chemical modification and formation of colon targeted microparticulates of Pachyman, Australasian Pharmaceutical Science Association Annual Conference Aus-CRS Symposium Program and Abstract book, 9-11 December 2009, Wrest Point Convention Centre, Hobart Tasmania, pp. 184. ISBN 978-0-646-52257-9 (2009) [Conference Extract]

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Poria cocos (Fuling), also named Wolfiporia extensa, a wood-decaying fungus, is widely used as a traditional Chinese medicinal herb. Linear pachyman from Poria powder can be chemically modified to carboxymethyl pachyman (CMP) which has higher water solubility. Pachyman and CMP may enhance body immunity, and have anti-bacterial, anti-hypoglycaemic and anti-tumour properties.

Objective. The aim of the study was to prepare and study colon targeted microparticulates of different molecular weight pachyman and CMP.

Methods. Pachyman was extracted from Poria cocos dry powder and was chemically modified to CMP. The pachyman and CMP were extracted with hot water and alcohol, degraded by hydrogen peroxide under the ultrasonic wave and then graded through Sephadex G-75. The degradation products with different molecular weights were cross-linked with azobenzene crosslinker to form azo-polymers for colon-specific drug delivery.

Results and Discussion. High yields of pachyman, containing low levels of protein and other impurities were obtained. The degradation products of pachyman had MW of 43-56000 Da. The degraded CMP had MW of around 66 000 Da. Because of the high degree of polymerization in Pachyman and CMP, it was not easy to make the azo cross-linker with colon-specific ability. IR analysis demonstrated that the pachyman degradation products reacted with the azo cross-linker to form colon-specific drug carriers. Degraded pachyman could carry test drugs but CMP products could not. Low molecular weight pachyman degradation products, but not the products from CMP, may be suitable as colon-specific drug carriers.

Item Details

Item Type:Conference Extract
Keywords:Chinese medicinal herb, Poria cocos, Fuling, Wolfiporia extensa, fungus, anti-tumour, anti-bacterial, anti-hypoglycaemic, colon, carboxymethyl pachyman
Research Division:Biomedical and Clinical Sciences
Research Group:Pharmacology and pharmaceutical sciences
Research Field:Basic pharmacology
Objective Division:Health
Objective Group:Clinical health
Objective Field:Clinical health not elsewhere classified
UTAS Author:Liu, T (Miss Tianqing Liu)
UTAS Author:Narkowicz, CK (Dr Christian Narkowicz)
UTAS Author:Jacobson, GA (Associate Professor Glenn Jacobson)
ID Code:65043
Year Published:2009
Deposited By:Pharmacy
Deposited On:2010-09-28
Last Modified:2015-09-28

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