Title Isolation, Characterization, and Evaluation of Wild Isolates of Lactobacillus reuteri from Pig Feces
Author Deog Yong Lee, Yeon-Soo Seo, Nabin Rayamajhi, Mi Lan Kang, Su In Lee, and Han Sang Yoo*
Address Department of Infectious Diseases, College of Veterinary Medicine, KRF Zoonotic Priority Research Institute and Brain Korea 21 Program for Veterinary Science, Seoul National University, Seoul 151-742, Republic of Korea
Bibliography Journal of Microbiology, 47(6),663-672, 2009,
Key Words probiotics, Lactobacillus spp., safety, characteristics, tolerance
Abstract Lactic acid bacteria (LAB) are a well-used probiotics for health improvements in both humans and animals. Despite of several benefits, non-host-specific LAB showed poor probiotics effects due to difficulty in colonization and competition with normal flora. Therefore, the feasibility of porcine LAB isolates was evaluated as a probiotics. Ten of 49 Lactobacillus spp. isolates harbored 2~10 kb plasmid DNA. Seven strains were selected based on the safety test, such as hemolytic activity, ammonia, indole, and phenylalanine production. After safety test, five strains were selected again by several tests, such as epithelial adherence, antimicrobial activity, tolerance against acid, bile, heat, and cold-drying, and production of acid and hydrogen peroxide. Then, enzyme profiles (ZYM test) and antibiotics resistance were analyzed for further characterization. Five Lactobacillus reuteri isolates from pig feces were selected by safety and functional tests. The plasmid DNA which was able to develop vector system was detected in the isolates. Together with these approaches, pig-specific Lactobacillus spp. originated from pigs were selected. These strains may be useful tools to develop oral delivery system.