Measurement of bacterial adhesion to metal surfaces with different chemical composition - evaluation of different methods

A. Żywicka, K. Fijałkowski
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引用次数: 1

Abstract

In the current study attention has been focused on the evaluation of different methods of measurement of bacterial adhesion to the metal surfaces with different chemical composition. The direct methods, which included determination of the number of bacterial cells using fluorescence microscopy and Colony Forming Units (CFU) on agar medium, and indirect methods using Alamar Blue (AB) and MTT assays, were evaluated. The chemical compositions of the metal surfaces included: copper, iron, chromium and nickel. Interaction effects of assay and metal compound have been specifically demonstrated in this study. It was found that metal ions reacted with components of the indirect colorimetric tests used in this study (AB and MTT assay). Consequently, those tests gave positive false results. In contrast to the indirect methods, direct counting methods such as microscopy techniques and CFU counting, were successfully applied for evaluation of bacterial adhesion to the metal surfaces. However, considering the limits for the surfaces of the examined samples for microscopy, the determination of the CFU was found to be the best method for testing the adhesion to metal surfaces. The method, combined with the appropriate detachment procedures allowed for a precise determination of the number of bacteria on the entire surface of the evaluated metal samples.
不同化学成分金属表面细菌粘附量的测定。不同方法的评价
在目前的研究中,人们关注的焦点是对不同化学成分的金属表面细菌粘附的不同测量方法的评价。对直接法(利用荧光显微镜和琼脂培养基上的菌落形成单位(CFU)测定细菌细胞数量)和间接法(利用Alamar Blue (AB)和MTT法)进行了评价。金属表面的化学成分包括:铜、铁、铬和镍。本研究特别证明了测定剂与金属化合物的相互作用。发现金属离子与本研究中使用的间接比色法(AB和MTT法)的组分发生反应。因此,这些测试给出了阳性的错误结果。与间接方法相比,显微镜技术和CFU计数等直接计数方法已成功应用于评估细菌对金属表面的粘附。然而,考虑到检测样品表面的显微镜限制,发现CFU的测定是测试金属表面附着力的最佳方法。该方法与适当的剥离程序相结合,可以精确测定被评估金属样品整个表面上的细菌数量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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