PRODUCTION-RELEVANT PARAMETERS REQUIRED FOR THE SELECTION OF ACTIVE STRAINS FOR NOVEL LACTOSE-CONTAINING MEDICINAL PROBIOTIC

2025

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DOI 10.53729/mv-as.2025.03.13
Data confidence 70 medium
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Abstract

This study focuses on selection and characterisation of morphological, biochemical, and cultural traits of Lactobacillus fermentum 30 and Lactobacillus cellobiosus 36 for a new lactose-containing medicinal probiotic, “AS-Probiunorm”. Among 150 isolates of lyophilized microbial cultures grown on de Man–Rogosa–Sharpe selective medium, the more active variants 30/1 and 36/1 were selected based on their antimicrobial spectrum, antagonistic activity against pathogenic and opportunistic microorganisms, and viable cells. Strain profiles of isolates 30/1 and 36/1 were established according to morphological, biochemical, and cultural characteristics, and two optimal culture media No. 1 and No. 2 were identified for their cultivation. According to the International Gene Bank database, strains 36/1 and 30/1were classified as Lacticaseibacillus paracasei. Certificates of deposition were obtained for Lacticaseibacillus paracasei 30/1 – B-RKM 1166 and Lacticaseibacillus paracasei 36/1 – B-RKM 1167 in the collection of the “Republican Collection of Microorganisms” LLP. Strains Lacticaseibacillus paracasei 30/1 and 36/1 are assigned to hazard class IV according to the current classification of non-pathogenic strains. Исследование посвящено отбору и изучению морфологических, биохимических, культуральных признаков Lactobacillus fermentum 30 и Lactobacillus cellobiosus 36 для нового лактосодержащего лекарственного пробиотика «АС-Пробионорм». Из 150 изолятов лиофильно высушенных культур микроорганизмов на селективной питательной среде Де Мана–Рогоза–Шарпа по спектру действия и по антагонистической активности в отношении патогенных и условно-патогенных микроорганизмов, а также по количеству жизнеспособных клеток отобраны более активные варианты - 30/1 и 36/1. Составлены паспорта микроорганизмов 30/1 и 36/1 по морфологическим, биохимическим и культуральным признакам и выбраны две оптимальные питательные среды №1 и № 2 для их культивирования. В международной базе данных Gene Bank образцы 36/1 и 30/1 отнесены к Lacticaseibacillus paracasei. Получены свидетельства о депонировании микроорганизмов Lacticaseibacillus paracasei30/1 – B-RKM 1166 и Lacticaseibacillus paracasei 36/1 – B-RKM 1167 в коллекции ТОО «Республиканская коллекция микроорганизмов». Штаммы Lacticaseibacillus paracasei 30/1 и 36/1 принадлежат к 4-му классу опасности согласно существующей классификации штаммов о непатогенности.