Document Type

Journal Article

Department/Unit

School of Chinese Medicine

Title

Non-toxic agarose/gelatin-based microencapsulation system containing gallic acid for antifungal application

Language

English

Abstract

Aspergillus niger (A. Niger) is a common species of Aspergillus molds. Cutaneous aspergillosis usually occurs in skin sites near intravenous injection and approximately 6% of cutaneous aspergillosis cases which do not involve burn or HIV-infected patients are caused by A. Niger. Biomaterials and biopharmaceuticals produced from microparticle-based drug delivery systems have received much attention as microencapsulated drugs offer an improvement in therapeutic efficacy due to better human absorption. The frequently used crosslinker, glutaraldehyde, in gelatin-based microencapsulation systems is considered harmful to human beings. In order to tackle the potential risks, agarose has become an alternative polymer to be used with gelatin as wall matrix materials of microcapsules. In the present study, we report the eco-friendly use of an agarose/gelatin-based microencapsulation system to enhance the antifungal activity of gallic acid and reduce its potential cytotoxic effects towards human skin keratinocytes. We used optimal parameter combinations, such as an agarose/gelatin ratio of 1:1, a polymer/oil ratio of 1:60, a surfactant volume of 1% w/w and a stirring speed of 900 rpm. The minimum inhibitory concentration of microencapsulated gallic acid (62.5 μg/ml) was significantly improved when compared with that of the original drug (>750 μg/ml). The anti-A. Niger activity of gallic acid-containing microcapsules was much stronger than that of the original drug. Following 48 h of treatment, skin cell survival was approximately 90% with agarose/gelatin microcapsules containing gallic acid, whereas cell viability was only 25-35% with free gallic acid. Our results demonstrate that agarose/gelatin-based microcapsules containing gallic acid may prove to be helpful in the treatment of A. Niger-induced skin infections near intravenous injection sites.

Keywords

Agarose, Aspergillus niger, Gallic acid, Gelatin, Micro-capsules

Publication Date

2015

Source Publication Title

International Journal of Molecular Medicine

Volume

35

Issue

2

Start Page

503

End Page

510

Publisher

Spandidos Publications

DOI

10.3892/ijmm.2014.2027

Link to Publisher's Edition

http://dx.doi.org/10.3892/ijmm.2014.2027

ISSN (print)

11073756

ISSN (electronic)

1791244X

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