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Screening of preservatives and evaluation of sterilized cellulose nanofibers for toxicity studies
Journal of Occupational Health ( IF 3 ) Pub Date : 2020-01-01 , DOI: 10.1002/1348-9585.12176
Takafumi Sai 1 , Junko Maru 2 , Sawae Obara 2 , Shigehisa Endoh 2 , Hideo Kajihara 2 , Katsuhide Fujita 2
Affiliation  

Abstract Objectives The aim of this study is to establish a sterilization method for cellulose nanofibers (CNFs) dispersions that uses multiple preservatives with different hydrophilicities without affecting the physical and chemical properties of CNFs, and to provide useful information for sample preparation in future toxicity study of CNFs. Methods Various preservatives were added to the phosphorylated CNF dispersions, endotoxin level and the numbers of bacteria and fungi in the CNF dispersion were analyzed. The pH values and viscosity of sterilized CNF dispersions were compared with those of control and autoclaved CNF dispersions. Results Phosphorylated CNF dispersions at a concentration of 2.0 mg/mL or lower and the addition of 10 µg/mL benzalkonium chloride alone or 250 µg/mL methyl parahydroxybenzoate and 250 µg/mL propyl parahydroxybenzoate in combination can sterilize CNF dispersions without changing the physical and chemical properties of CNFs. Conclusions We developed sterilization method for CNF dispersions that uses multiple preservatives with different hydrophilicities without affecting the physical and chemical properties of CNFs. This sterilization method for CNFs dispersions can be applied to the safety assessment of CNF with different physicochemical properties in the future.

中文翻译:

用于毒性研究的防腐剂的筛选和灭菌纤维素纳米纤维的评价

摘要 目的本研究的目的是建立一种使用多种不同亲水性防腐剂的纤维素纳米纤维(CNFs)分散体的灭菌方法,同时不影响CNFs的物理和化学性质,并为未来毒性研究的样品制备提供有用的信息。 CNF。方法在磷酸化的CNF分散液中加入各种防腐剂,分析CNF分散液中的内毒素水平和细菌和真菌的数量。将灭菌的 CNF 分散体的 pH 值和粘度与对照和高压灭菌的 CNF 分散体的 pH 值和粘度进行比较。结果 浓度为 2 的磷酸化 CNF 分散体。0 mg/mL 或更低以及单独添加 10 µg/mL 苯扎氯铵或 250 µg/mL 对羟基苯甲酸甲酯和 250 µg/mL 对羟基苯甲酸丙酯的组合可以对 CNF 分散体进行消毒,而不会改变 CNF 的物理和化学性质。结论 我们开发了 CNF 分散体的灭菌方法,该方法使用具有不同亲水性的多种防腐剂,而不影响 CNF 的物理和化学性质。这种CNFs分散体的灭菌方法可以应用于未来不同理化性质的CNF的安全性评估。结论 我们开发了 CNF 分散体的灭菌方法,该方法使用具有不同亲水性的多种防腐剂,而不影响 CNF 的物理和化学性质。这种CNFs分散体的灭菌方法可以应用于未来不同理化性质的CNF的安全性评估。结论 我们开发了 CNF 分散体的灭菌方法,该方法使用具有不同亲水性的多种防腐剂,而不影响 CNF 的物理和化学性质。这种CNFs分散体的灭菌方法可以应用于未来不同理化性质的CNF的安全性评估。
更新日期:2020-01-01
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