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Control of microbial contamination of Franz diffusion cell receptor phase in the development of transcutaneous breast cancer therapeutics

Davison, Zoe, Nicholson, Robert Ian, Maillard, Jean-Yves, Denyer, Stephen Paul and Heard, Charles Martin 2009. Control of microbial contamination of Franz diffusion cell receptor phase in the development of transcutaneous breast cancer therapeutics. Letters in Applied Microbiology 49 (4) , pp. 456-460. 10.1111/j.1472-765X.2009.02685.x

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Abstract

AIMS: To determine the micro-organism contamination of excised porcine (pig) ear, and evaluate the use of Cyclopore track-etched membranes (CTEM) for preventing ingress into Franz-type diffusion cells. METHODS: Swabs were taken from four locations and used to inoculate Tryptone Soya Agar (TSA) and Sabouraud Dextrose Agar (SDA) plates. Diffusion cells were assembled to include porcine skin with and without CTEM, and the receptor phase sampled periodically and spread onto plates. RESULTS: Five distinct colony types were isolated after incubation of all swabs on TSA plates at 37 degrees C; on SDA plates, one fungal colony was found at 30 degrees C and one at 37 degrees C. The SDA agar plate incubated at 30 degrees C resulted in the growth of a large diffused white fungal colony. No regional differences were observed. Without the CTEM, the receptor phase became contaminated within 6 h. With the CTEM present, microbial ingress was substantially retarded with visible presumptive fungal growth occurring at 24 h and detectable contamination on both microbiological media at 48 h. CONCLUSIONS: As expected, the native porcine ears were considerably contaminated. The ingress of contamination into the diffusion cell receptor phases can be largely, but not entirely, eliminated using CTEM. The addition of antimicrobial agents was necessary to eliminate micro-organisms that were observed at later time points. SIGNIFICANCE AND IMPACT OF THE STUDY: This article, while highlighting the presence of a high number of micro-organisms on native porcine skin, presents a practical means to reduce the risk of microbial contamination in transdermal/transcutaneous permeation studies, particularly in the study of cell cultures grown within Franz diffusion cell receptor compartments.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Pharmacy
Subjects: Q Science > QR Microbiology
R Medicine > RC Internal medicine > RC0254 Neoplasms. Tumors. Oncology (including Cancer)
R Medicine > RM Therapeutics. Pharmacology
Uncontrolled Keywords: bacteria; Cyclopore track-etched membrane; Franz diffusion cell; fungus; porcine ear; skin; transdermal delivery
Publisher: Wiley-Blackwell
ISSN: 0266-8254
Last Modified: 15 Dec 2017 10:18
URI: http://orca.cf.ac.uk/id/eprint/44323

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