• 제목/요약/키워드: Bile and Acid Tolerance

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Isolation and Characterization of Lactic Acid Bacteria from Kimchi, Korean Traditional Fermented Food to Apply into Fermented Dairy Products

  • Cho, Young-Hee;Hong, Sung-Moon;Kim, Cheol-Hyun
    • 한국축산식품학회지
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    • 제33권1호
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    • pp.75-82
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    • 2013
  • This study aimed to isolate lactic acid bacteria (LAB) from Kimchi and to identify suitable probiotic strain for application in fermented dairy product as a commercial starter culture. A total of 106 (LAB) strains were isolated from Kimchi collected from different regions in Korea and their phenotypic characteristics were assayed. Four isolates from MRS agar plates were selected and designated as DKL109, DKL119, DKL121 and DKL128. They were identified first by API 50 CHL kit and then 16S rRNA gene sequencing. DKL121 and DKL128 were identified as Lactobacillus paracasei and Lactobacillus casei, respectively. Other two isolates (DKL109 and DKL119) were identified as Lactobacillus plantarum. To estimate their applicability in dairy products, the characteristics including acid and bile tolerance, cold shock induced cryotolerance and enzymatic activities were determined. There was wide variation in ability of strains to acid tolerance, but no significant differences in bile tolerance, cold shock induced cryotolerance within selected strains. DKL119 and DKL121 showed the highest resistance to acid and bile and the highest ${\beta}$-galactosidase activity, respectively. When these two strains were used for yogurt preparation as a single starter culture, their viable cell counts reached to $1.0{\times}10^9CFU/mL$. Lactobacillus plantarum DKL119 showed faster acid development than commercial starter culture. Also storage trials at $10^{\circ}C$ showed that the viability of these strains was retained over 15 d. With these results, it was indicated that probiotics isolated from Kimchi can be used in yogurt manufacturing as a starter culture.

순물의 Lactobacillus acidophilus 배지로서으 이용 및 생육균주의 내산성과 내담즙산성 (Utilization of Soybean Curd Whey as a Medium for Lactobacillus acidophilus and Acid-and Bile-tolerance of Cultured Strains)

  • 정수현;서형주;이호
    • 한국식품영양과학회지
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    • 제26권5호
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    • pp.872-877
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    • 1997
  • Soybean curd whey(SCW) containing plenty of nutrients is the discarded by-product in soybean curd processing. To test the potential utilization of SCW as a medium for the cultivation of Lactobacilus acidophilus, the chemical composition of SCW, as well as the growth, acid production, acid-tolerance, and bile-tolerance of L. acidophilus in SCW-based media were investigated. Sucrose and stachyose, the main free sugars of SCW, were 0.42% and 0.41%, respectively. SCW contained 36.1mg/L of total free amino acids. L. acidophilus KFRI 150 showed lower cell growth and acid production in SCW than those in MRS broth. In optimized SCW-based medium supplemented with 1.0% glucose, 0.5% yeast extract, and 0.2% $K_{2}HPO_{4}$, the growth and acid production of L. acidophilus KFRI 150 increased by twice against those in SCW. In optimized SCW-based medium, the viable counts of four L. acidophilus strains were mostly at the level of $10^{9}$/ml, which is similar to those in MRS broth. Each acid-tolerance and biletolerance of four L. acidophilus strains cultured in optimized SCW-based medium and MRS broth showed no dist-inguishable difference.

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양돈용 생균제 개발을 위한 유산균주 선발 (In vitro selection of lactic acid bacteria for probiotic use in pigs)

  • 변재원;김경태;배형석;백영진;이완규
    • 대한수의학회지
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    • 제40권4호
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    • pp.701-706
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    • 2000
  • This study was carried out to select the lactic acid bacteria(Lactobacillus, Streptococcus and Bifidobacterium) and yeast for probiotic use in pigs. Acid-tolerant 536 strains were isolated from the feces of 30 pigs. To select useful strains, the first screened strains were treated with strong acid solution(pH 2.5 to 3.0) for 3 hours and subsequentely treated with the anaerobic diluent solution containing 0.15% Oxgall for 3 hours. Among these strains, 151 strains showed strong tolerance to both acid and bile. Lactobacillus and Streptococcus tolerant to the acid and bile were treated with heat at $80^{\circ}C$ for 15 min, and at $70^{\circ}C$ for 5 min in Bifidobacterium and yeast. As a result of heat treatment, 38 strains were obtained as heat-tolerant strains. All of heat-tolerant strains were tested for antibiotic resistance against virginiamycin, sulfathiazole, aureomycin, neomycin, linsmycin, tiamulin and ASP250 which were used as feed additives for growth promotion in pigs. Finally, one strain each from Lactobacillus, Streptococcus, Bifidobacterium and yeast that showed resistance to acid, bile, heat and antibiotics was selected for probiotic use in pigs.

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젖산 발효제품에서 분리한 유산균의 내산성 비교 (Comparative Tests on the Acid Tolerance of Some Lactic-Acid-Bacteria Species Isolated from Lactic Fermented Products)

  • 심재헌;오세종;김상교;백영진
    • 한국식품과학회지
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    • 제27권1호
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    • pp.101-104
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    • 1995
  • 유제품 30여종과 야채발효 제품 2종에서 Lactobacillus casei ssp.(5 strains), Lactobacillus acidophilus(2 strains), Lactobacillus delbrueckii ssp. bulgaricus(6 strains), Lactobacillus plantarum(3 strains), Streptococcus salivarius ssp. thermophilus(11 strains), and Streptococcus faecalis(2 strains)를 각각 분리하여 이들의 내산성과 담즙산 내성을 평가하였다. 초기생균수를 고려하여 공분산분석으로 내산성을 비교한 결과, L. casei에 속하는 균주들의 내산성이 가장 우수하였으며, L. bulgaricus와 균주들은 가장 낮은 내산성을 보였다(p<0.05). 담즙산 내성은 L. casei, L. plantarum, L. acidophilus, S. feacalis 균주들의 경우 비슷한 경향을 보였으나, L. bulgaridus와 S. thermophilus 그룹에 속하는 균주들의 담즙산 내성은 거의 없는 것으로 나타났다.

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Isolation of Cholesterol-Lowering Lactic Acid Bacteria from Pig and Human Feces

  • Ryu Hye Myung;Kim Sang Gyo;Kim Su Won;Choi Ju Yun;Nam Jin Sik;Yoo Min
    • 대한의생명과학회지
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    • 제11권4호
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    • pp.539-543
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    • 2005
  • Elevated level of serum cholesterol in humans is a risk factor correlated with the development of coronary heart disease. We have screened lactic acid bacteria from pig and human feces for the development of probiotics which have an anti-cholesterol effect. We have used special media to isolate only lactic acid bacteria and they were subjected to the experiments such as oxgal test, carbohydrate fermentation test. Results from the acid tolerance test and growth test in the presence of oxgal demonstrated that some strains would likely survive in thuman stomach, where acidity is high, and in small intestine, where bile fluid is present. In conclusion, we were able to screen lactic acid bacteria which were tolerant against bile acid and supposed to be prominent to lower the cholesterol level in human serum.

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Bile and Acid Tolerance of Lactic Acid Bacteria Isolated from Dadih and Their Antimutagenicity against Mutagenic Heated Tauco

  • Pato, Usman
    • Asian-Australasian Journal of Animal Sciences
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    • 제16권11호
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    • pp.1680-1685
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    • 2003
  • Antimutagenicity of milk cultured with lactic acid bacteria isolated from dadih on the mutagenicity of heated salty and sweet tauco was examined using streptomycin dependent (SD) 510 strain of Salmonella typhimurium TA 98 as a tester culture. Cultured milk samples exhibited widely antimutagenic activity against mutagenic heated salty and sweet tauco. Lc. lactis subsp. lactis R-22, Lc. lactis subsp. casei R-35, Lc. lactis subsp. casei R-52 and E. faecalis subsp. liquefaciens R-55 exhibited no inhibitory effect on the mutagenic heated salty tauco. Mutagenicity of heated sweet tauco was inhibited by cultured milks stronger than that of heated salty tauco. Milk cultured with Lc. lactis subsp. cremoris R-48, Leuc. mesentroides R-51 and Lc. lactis subsp. casei R-68 showed high inhibition against the mutagenicity of both heated salty and sweet taucos. Antimutagenic activity of the cultured milks against mutagenic heated tauco was attributed to the bacterial cells. Among the three strains which showed high antimutagenicity, only Leuc. mesentroides R-51 was tolerant to both acid and bile; so this strain can be used as probiotic in preventing the occurrence of mutagenesis caused by mutagenic heated food like tauco.

산, 담즙산, 산소 노출에 대한 비피도박테리아의 생존에 관한 연구 (Viability of Bifidobacterial Strains against Acid, Bile Acid, and Oxygen Exposure)

  • 임광세;허철성
    • 한국축산식품학회지
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    • 제26권4호
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    • pp.503-510
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    • 2006
  • 한국인 유아에서 분리한 13개 균주를 포함한 19개 bifidobacteria 균주를 대상으로 산, 담즙산 및 산소 노출시의 생균수의 변화를 측정하였다. 내산성은 pH 4.0, 3.0, 2.0에서 2시간까지 측정하였는데, 실험 균주마다 매우 상이한 결과를 나타내었으며, 실험 균주 중에서 B. bifidum B3, B. longum D6, B. adolescentis Fl이 우수한 생존력을 나타내었다. 실험 균주를 0.2% thioglycolic acid와 0.2% oxgall이 함유된 MRS 배지에서 생장을 측정한 결과, B. bififdum B3과 B. longum D6이 담즙산에 우수한 저항성을 나타냈으며, 균종간의 경향은 관찰되지 않았다. 호기 상태에서 48시간 노출시킨 후에 생균수의 변화를 측정한 결과, 실험 균주마다 상이한 결과를 나타내었으며 상대적으로 B. bifidum과 B. longum균주들의 생존력이 우수하였다. 산, 담즙, 산소 노출에 대한 생존력은 균종간의 경향을 나타내지 않고 균주마다 상이한 결과를 나타내었는데, 실험 균주 중에는 B. bifidum B3과 B. longum D6 균주가 모두 우수한 생존율을 나타내었다. 이들 균주는 현재 시판되는 상업용 종균과 비교해서도 동등한 성적을 나타내어 상업용 종균으로서의 사용 가능성을 시사하였다.

Assessment of lactic acid bacteria isolated from the chicken digestive tract for potential use as poultry probiotics

  • Merisa Sirisopapong;Takeshi Shimosato;Supattra Okrathok;Sutisa Khempaka
    • Animal Bioscience
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    • 제36권8호
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    • pp.1209-1220
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    • 2023
  • Objective: The use of probiotics as an alternative to antibiotics in animal feed has received considerable attention in recent decades. Lactic acid bacteria (LAB) have remarkable functional properties promoting host health and are major microorganisms for probiotic purposes. The aim of this study was to characterize LAB strains of the chicken digestive tract and to determine their functional properties for further use as potential probiotics in poultry. Methods: A total of 2,000 colonies were isolated from the ileum and cecal contents of the chickens based on their phenotypic profiles and followed by a preliminary detection for acid and bile tolerance. The selected 200 LAB isolates with exhibited well-tolerance in acid and bile conditions were then identified by sequencing the 16S rDNA gene, followed by acid and bile tolerance, antimicrobial activity, adhesion to epithelial cells and additional characteristics on the removal of cholesterol. Then, the two probiotic strains (L. ingluviei and L. salivarious) which showed the greatest advantage in vitro testing were selected to assess their efficacy in broiler chickens. Results: It was found that 200 LAB isolates that complied with all measurement criteria belonged to five strains, including L. acidophilus (63 colonies), L. ingluviei (2 colonies), L. reuteri (58 colonies), L. salivarius (72 colonies), and L. saerimneri (5 colonies). We found that the L. ingluviei and L. salivarius can increase the population of LAB and Bifidobacterium spp. while reducing Enterobacteria spp. and Escherichia coli in the cecal content of chickens. Additionally, increased concentrations of valeric acid and short chain fatty acids were also observed. Conclusion: This study indicates that all five Lactobacillus strains isolated from gut contents of chickens are safe and possess probiotic properties, especially L. ingluviei and L. salivarius. Future studies should evaluate the potential for growth improvement in broilers.

Screening and Characterization of Pro biotic Lactic Acid Bacteria Isolated from Korean Fermented Foods

  • Lim, Sung-Mee;Im, Dong-Soon
    • Journal of Microbiology and Biotechnology
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    • 제19권2호
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    • pp.178-186
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    • 2009
  • To examine their potential as probiotics, acid and bile tolerance, antibiotics resistance, adhesion capacity to Caco-2 and HT-29, and antibacterial activity, of LAB isolated from Korean fermented foods such. as dongchimi, kimchi, Meju, and doenjang were assayed against foodborne pathogenic bacteria. DC 55, DC 136, DC 222, KC 21, KC 24, KC 34, KC 43, KC 117, MJ 54, MJ 301, SP 33, and SP 170 strains were resistant to acid and bile conditions. In particular, DC 55, DC 136, KC 24, KC 43, and MJ 301 strains were highly resistant to higher than 20 ${\mu}g/ml$ concentrations of vancomycin, streptomycin sulfate, or amoxicillin, whereas, DC 222, KC 21, KC 34, KC 117, MJ 54, and SP 33 strains were susceptible to lower than 2 ${\mu}g/ml$ concentrations of those antibiotics. The adhesion to HT-29 and Caco-2 cells varied with the strains tested in a strain-dependent manner. The highest level of adhesion was observed with DC 55, KC 21, KC 24, and MJ 301 strains, having higher than 50% of adhesion to HT-29 or Caco-2 cells. In addition, Staphylococcus aureus was the most sensitive to KC 21, showing an inhibition of about 70%, and the antibacterial activity of KC 21 against S. aureus resulted most likely from both organic acids and bacteriocin. Based on its phenotypic characteristics and utilization of various sugars, the KC 21 strain was identified as Lactobacillus plantarum.

산란계 맹장 유산균의 특성에 관한 연구 (Study on Characteristics of Lactobacillus Isolated from Hen′s Cecum)

  • 김상호;박수영;유동조;이상진;나재천;최철환;이상진;류경선
    • 한국가금학회지
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    • 제27권3호
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    • pp.227-233
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    • 2000
  • Preset study was carried out to evaluate characteristics of lactic acid producing bacteria(LAB) in hen's cecum as probiotics value. Distribution of LAB in intestinal tracts was investigated using 5∼25 weeks - old hens. So, 12 strains to LAB with different morphology were isolated purely. Acid tolerance of LAB tested at pH 1, 2, 3, and 4, and bile resistant also tested at 0, 0.3% and 0.5% bile salt concentration. Growth pattern of LAB observed to 60h. All strains of cecal LAB couldn't survive at pH 1, and decreased linearly survival colony after incubation at pH 2 although some strains could survive for 2h. Most of LAB maintained constant number at pH 3 and 4. The bacterial action could increase linearly at 0% bile salt concentration in all of tested strains. However, only one strain could multiply at 0.3% bile salt, others were influenced by bile salt. That tendency was similar at 0.5% bile salt. Growth was peaked at 12 to 18 h after innoculation. After peak, the decreasing pattern of colony was different to strains which some strains decreased rapidly or maintained for long time. The LAB of hen's cecum was similar to intolerance acidity, but different to resistant to bile salt and growth pattern by strain. So, we choose three strains which have probiocs value, and identified as Lactobacillus amylovorus LLA7, Lactobacillus crispatus LLA9 and Lactobacillus vaginalis LLA11.

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