歧管式装置中细菌试验菌株的冻干:冷冻和干燥参数、安瓿填充体积和棉花过滤器密度的影响

A. A. Voropaev, O. V. Fadeikina, T. N. Ermolaeva, D. S.  Davydov
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引用次数: 0

摘要

科学的相关性。冻干法是俄罗斯联邦卫生部药品专家评价科学中心国家病原微生物收集(NCPM)的首选方法。冻干用于提供高标准的试验菌株沉积、储存和运输,并确保试验菌株保持其特性。成功的冻干需要进行实验来确定过程的关键参数和关键条件。的目标。本研究旨在评价冷冻的速度和时间、干燥的时间、安瓿的填充体积和棉花过滤器的密度对在歧管式装置中冻干的NCPM指示微生物的质量的影响。材料和方法。铜绿假单胞菌NCTC 12924、金黄色葡萄球菌NCTC 10788和Abony沙门氏菌NCTC 6017采用多管式冻干装置(m.s.r.18, Usifroid)进行冻干。作者使用-70±2°C低温冷冻器进行慢速冷冻,使用干冰和酒精的混合物进行速冻。采用Microsoft Excel和Statistica 10进行统计分析。结果。样品在-70±2°C低温冷冻室中冷冻的最短时间为4小时。在此温度下进一步储存长达1个月是可能的,而不会影响最终产品的质量。在干冰和酒精的混合物中冷冻样品所需的时间不到1分钟。除了蛋糕外观外,在缓慢或快速冷冻的冻干样品之间没有观察到质量参数的差异。快速冷冻导致蛋糕不均匀,易碎,并从安瓿瓶壁上脱落,这是不受欢迎的。填充量为0.2 mL的安瓿瓶的初级干燥阶段需要6-8小时。第二次干燥阶段11,18,35和59小时的冻干液质量相当:作者在冻干结束和压力测试结束时观察到活细胞计数(CFU/mL)无统计学显著差异。二次干燥59 h后残余水分含量小于2%。棉花过滤密度对冻干液品质有重要影响。因此,作者建议使用重量不超过50毫克的棉质过滤器。结论。作者分析了用于NCPM试验菌株的冻干过程的主要阶段,并考虑了冷冻的速度和时间、干燥的时间、安瓿的填充体积和棉花过滤器的密度对最终冻干产品质量的影响。NCPM在其工作中实施了这项研究的结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Lyophilisation of bacterial test strains in a manifold-type apparatus: Effects of freezing and drying parameters, ampoule fill volume, and cotton filter density
Scientific relevance. Lyophilisation is the preferred method at the National Collection of Pathogenic Microorganisms (NCPM) of the Scientific Centre for Expert Evaluation of Medicinal Products of the Ministry of Health of the Russian Federation. Lyophilisation is used to provide for high standards of test-strain deposition, storage, and transportation and to ensure that test strains maintain their properties. Successful lyophilisation requires conducting experiments to establish the key parameters and critical conditions of the process. Aim. The study aimed to evaluate the effects that the speed and time of freezing, the time of drying, the fill volume of ampoules, and the density of cotton filters have on the quality of NCPM indicator microorganisms lyophilised in a manifold-type apparatus. Materials and methods. Pseudomonas aeruginosa NCTC 12924, Staphylococcus aureus NCTC 10788, and Salmonella Abony NCTC 6017 were freeze-dried using a manifold-type apparatus (M. S. R. 18, Usifroid). The authors used a low-temperature freezer at –70±2 °C for slow freezing and a mixture of dry ice and alcohol for quick freezing. The statistical analysis was performed using Microsoft Excel and Statistica 10. Results. The minimum time needed for freezing the samples in a low-temperature freezer at –70±2 °C was 4 hours. Further storage at this temperature for up to 1 month was shown possible without compromising the quality of the final product. The time needed for freezing the samples in a mixture of dry ice and alcohol was under 1 minute. No differences in quality parameters were observed between the lyophilised samples frozen slowly or quickly, except for the cake appearance. Quick freezing resulted in cakes that were non-uniform, crumbled, and pulled away from the ampoule walls, which is considered undesirable. The primary drying stage for ampoules with a fill volume of 0.2 mL took 6–8 hours. The secondary drying stage of 11, 18, 35, and 59 hours resulted in comparable lyophilisate quality: the authors observed no statistically significant differences in viable cell counts (CFU/mL) at the end of lyophilisation and at the end of stress testing. The residual moisture content after 59-hour secondary drying was less than 2%. The cotton filter density had a critical influence on the lyophilisate quality. Therefore, the authors recommend using cotton filters weighing 50 mg or less. Conclusions. The authors analysed the main stages of the lyophilisation process used for NCPM test strains and considered the effects that the speed and time of freezing, the time of drying, the fill volume of ampoules, and the density of cotton filters have on the quality of the final lyophilised product. The NCPM has implemented the results of this study in its work.
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