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Chemical modification of polyvinyl chloride and silicone elastomer in inhibiting adhesion of Aeromonas hydrophila

机译：化学改性聚氯乙烯和有机硅弹性体抑制嗜水气单胞菌的粘附

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Disease-causing bacteria of the genus Aeromonas are able to adhere to pipe materials, colonizing the surfaces and forming biofilms in water distribution systems. The aim of our research was to study how the modification of materials used commonly in the water industry can reduce bacterial cell attachment. Polyvinyl chloride and silicone elastomer surfaces were activated and modified with reactive organo-silanes by coupling or co-crosslinking silanes with the native material. Both the native and modified surfaces were tested using the bacterial strain Aeromonas hydrophila, which was isolated from the Polish water distribution system. The surface tension of both the native and modified surfaces was measured. To determine cell viability and bacterial adhesion two methods were used, namely plate count and luminometry. Results were expressed in colony-forming units (c.f.u.) and in relative light units (RLU) per cm2. Almost all the chemically modified surfaces exhibited higher anti-adhesive and anti-microbial properties in comparison to the native surfaces. Among the modifying agents examined, poly[dimethylsiloxane-co-(N,N-dimethyl-N-n-octylammoniopropyl chloride) methylsiloxane)] terminated with hydroxydimethylsilyl groups (20 %) in silicone elastomer gave the most desirable results. The surface tension of this modifier, was comparable to the non-polar native surface. However, almost half of this value was due to the result of polar forces. In this case, in an adhesion analysis, only 1 RLU cm−2 and less than 1 c.f.u. cm−2 were noted. For the native gumosil, the results were 9,375 RLU cm−2 and 2.5 × 108 c.f.u. cm−2, respectively. The antibacterial activity of active organo-silanes was associated only with the carrier surface because no antibacterial compounds were detected in liquid culture media, in concentrations that were able to inhibit cell growth.
机译：气单胞菌属的致病细菌能够粘附在管道材料上，在水分配系统中定植表面并形成生物膜。我们研究的目的是研究水工业中常用材料的改性如何减少细菌细胞的附着。通过将硅烷与天然材料偶联或共交联，可以用反应性有机硅烷活化和改性聚氯乙烯和有机硅弹性体表面。使用从波兰水分配系统中分离出的嗜水气单胞菌菌株对天然和改良表面进行了测试。测量了天然表面和改性表面的表面张力。为了确定细胞活力和细菌粘附，使用了两种方法，即板计数和发光法。结果以每厘米 2 的菌落形成单位（c.f.u.）和相对光照单位（RLU）表示。与天然表面相比，几乎所有经过化学修饰的表面均表现出更高的抗粘着性和抗微生物特性。在所研究的改性剂中，以有机硅弹性体中的羟基二甲基甲硅烷基（20％）封端的聚[二甲基硅氧烷-共-（N，N-二甲基-N-正辛基氨丙基氯）甲基硅氧烷）]给出了最理想的结果。该改性剂的表面张力与非极性天然表面相当。但是，该值的几乎一半是极性力的结果。在这种情况下，在附着力分析中，只有1 RLU cm -2 并且小于1 c.f.u.记录了cm −2 。对于天然树胶硅脂，结果为9,375 RLU cm -2 和2.5×10 8 c.f.u。 cm −2 。活性有机硅烷的抗菌活性仅与载体表面有关，因为在液体培养基中未检测到能够抑制细胞生长的抗菌化合物。

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