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12. Selection and characterization of broad-spectrum antibacterial substance-producingLactobacillus curvatusPA40 as a potential probiotic for feed additives

Author

Jun-Sang Ham, Sung Wook Hong, Kun Sub Chung, Jong-Hui Kim, Bae Hyo Ju, Jae Gyu Yoo, and Mi-Hwa Oh

Subjects
0301 basic medicine, Feed additive, 030106 microbiology, Bacillus cereus, Escherichia coli O157, medicine.disease_cause, law.invention, Bile Acids and Salts, 03 medical and health sciences, Probiotic, chemistry.chemical_compound, Listeria monocytogenes, law, Drug Resistance, Bacterial, medicine, Food science, Gastric Juice, biology, Chemistry, Probiotics, Salmonella enterica, food and beverages, General Medicine, biology.organism_classification, Animal Feed, Anti-Bacterial Agents, Lactic acid, Lactobacillus, Food Additives, Fermentation, General Agricultural and Biological Sciences, Antibacterial activity, Bacteria
Abstract

Lactic acid bacteria were screened for potential probiotics for use as feed additives. We obtained 3,000 isolates from feces of: cattle, dogs, goats, and infants; milk; yogurt; cheese; fermented sausages; Kimchi; and Cheonggukjang and tested their antibacterial activity toward indicator pathogens, including Bacillus cereus, Listeria monocytogenes, Escherichia coli O157:H7, and Salmonella enterica Enteritidis. We further tested their tolerance to artificial gastric juice (1% [w/v] pepsin, pH 2.5) and bile acid (0.1% [w/v] oxgall, pH 6.8). Six isolates exhibited strong antibacterial activity against indicator pathogens. The PA40 isolate from Kimchi exhibited marked resistance to artificial gastric juice and bile acid. The antibacterial substances produced by PA40 were stable to heat, pH, and enzymes. Strain PA40 was identified as a Lactobacillus curvatus strain using chemical tests and 16S rDNA sequencing and produced 248.4 mmol/L lactic acid after 48 hr of fermentative growth. The L. curvatus PA40 strain was also highly tolerant of the artificial gastrointestinal model system. Our results indicate that L. curvatus PA40 could be used as a potential probiotic feed additive.

Published
2018
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14. Selection and characterization of broad‐spectrum antibacterial substance‐producing Lactobacillus curvatus PA40 as a potential probiotic for feed additives.

Author

Hong, Sung Wook, Kim, Jong‐Hui, Bae, Hyo Ju, Ham, Jun‐Sang, Yoo, Jae Gyu, Chung, Kun Sub, and Oh, Mi‐Hwa

Subjects
SPECTRUM analysis, ANTIBACTERIAL agents, LACTOBACILLUS, PROBIOTICS, LISTERIA monocytogenes, GASTRIC juice, THERAPEUTICS
Abstract

Abstract: Lactic acid bacteria were screened for potential probiotics for use as feed additives. We obtained 3,000 isolates from feces of: cattle, dogs, goats, and infants; milk; yogurt; cheese; fermented sausages; Kimchi; and Cheonggukjang and tested their antibacterial activity toward indicator pathogens, including Bacillus cereus, Listeria monocytogenes, Escherichia coli O157:H7, and Salmonella enterica Enteritidis. We further tested their tolerance to artificial gastric juice (1% [w/v] pepsin, pH 2.5) and bile acid (0.1% [w/v] oxgall, pH 6.8). Six isolates exhibited strong antibacterial activity against indicator pathogens. The PA40 isolate from Kimchi exhibited marked resistance to artificial gastric juice and bile acid. The antibacterial substances produced by PA40 were stable to heat, pH, and enzymes. Strain PA40 was identified as a Lactobacillus curvatus strain using chemical tests and 16S rDNA sequencing and produced 248.4 mmol/L lactic acid after 48 hr of fermentative growth. The L. curvatus PA40 strain was also highly tolerant of the artificial gastrointestinal model system. Our results indicate that L. curvatus PA40 could be used as a potential probiotic feed additive. [ABSTRACT FROM AUTHOR]

Published
2018
Full Text
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