• Environmental Analysis Health and Toxicology
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• v.22 no.4
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• pp.287-297
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• 2007

유산균(Lactic acid bacteria)은 Escherichia coli와 Salmonella typhimurium과 같은 병원균에 항균 활성을 지니며 면역 증강효과를 나타내는 등 건강에 이로운 다양한 역할을 한다. 유산균에 의한 항균 효과는 E. coli와 S. typhiumurium에 대항하는 항균 활성으로 측정되어 졌으며, 면역 증강 효과는 유산균을 처리한 RAW264.7 대식세포의 활성화로 측정하였다. Lactobacillus acidophilus, Streptococcus thermophilus, Bifidobacterium bifidum의 E. coli와 S. typhimurium에 대한 항균활성은 9시간 이상 혼합 배양하였을 때 가장 좋은 항균효과를 나타내었고 E. coli와 S. typhiumurium 두 균주가 9시간 이후에는 모두 콜로니를 형성하지 않았다. RAW264.7 세포는 유산균에 의한 NO와 $TNF-{\alpha}$의 생성과 대식세포의 형태 변화를 알아보기 위한 대식세포로서 이용되었다. NO와 $TNF-{\alpha}$의 생성은 유산균을 처리한 RAW264.7세포의 24,48시간 배양 시 농도 의존적으로 증가하였고 대식세포의 형태 변화 역시 유산균에 의해 영향을 받았음을 확인할 수 있었다. 이를 통하여 (주)쎌바이텍으로부터 분양받은 유산균은 항균활성과 대식세포의 활성을 유도하여 면역을 증강시키는 효과를 지니고 있음을 in vitro 실험을 통해 확인하였다.

• Korean Journal of Agricultural Science
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• v.11 no.1
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• pp.34-44
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• 1984

This experiment was carried out to obtain the fundamental data for development of digestibility and quality enhanced product of soy yogurt. Soy yogurt was processed from raw materials of soybean, defatted soybean and sprouted soybean which inoculated with Lactobacillus acidophilus and Bifidobacterium bifidum as a starter. Changes of chemical compositions, viable cell count and saccharides during processing were investigated including acceptibility of manufactured products. The results were summarized as follows; 1. Defatted soy milk ferment ed with Lactobacillus acidophilus was showed the greatest initial acid productivity and sprouted soy milk was showed the greatest growth of Loctobacillus acidophilus. 2. Acid production was accelerated when 2% glucose was used in soy milk. 3. Addition of reconstituted skim milk in soy milk and defatted roy milk increased acid production but was not showed the effect in the sprouted soy milk. 4. Sprouting soybean, the contents of raffinose and stachyose were decreased but those of glucose was increased. 5. When soy milk was fermented with Lactobacillus acidophilus. the contents of raffinose and stachyose were decreased. 6. As a result of panel test, sprouted soy yogurt which was produced by addition of reconstituted skim milk of 10% showed the greatest flavor and tastes.

• Food Science of Animal Resources
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• v.30 no.4
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• pp.575-581
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• 2010

This investigation was aimed at developing a ready-to-reconstitute beverage by utilizing probiotics and whey protein hydrolysates carrying bioactive peptides. Cheddar cheese whey was ultrafiltered. The 18% protein retentate was subjected to protein hydrolysis using Neutrase. The hydrolyzed retentate was further condensed to 35% total solids and spray-dried at $75^{\circ}C$ outlet air temperature. Different levels of sugar, citric acid and stabilizer were blended for spray-dried hydrolysates. Spray-dried hydrolysate was further inoculated with different levels of probiotics grown in a whey medium and dried in fluidized-bed drier at $40^{\circ}C$ to obtain a ready-to-reconstitute beverage. Hydrolysis was greatest at an enzyme:substrate ratio of 1:25 for 3 h. Spray-dried hydrolysate reconstituted to 1% protein and blended with 15% sugar, 0.2% citric acid and 0.15% xantham gum resulted in a superior product with no sedimentation. Accordingly, sugar, citric acid and xanthum gum were dry-blended with spray-dried hydrolysates. Bifidobacterium bifidum and Lactobacillus acidophilus that was grown separately in a whey medium, blended to produce 2% spray-dried hydrolysate and dried as described above resulted in a readyto-reconstitute beverage mix. The fluidized dried product typically exhibited a probiotic count of $10^8$colony forming units (CFU)/g. However, blending of probiotic to the retentate and direct spray-drying precipitously reduced the probiotic count to $10^4$ CFU/g of powder.

• Preventive Nutrition and Food Science
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• v.20 no.2
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• pp.126-132
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• 2015

This study investigated the anti-amnesic effect of fermented Ganoderma lucidum water extracts (GW) on scopolamine- induced memory impairment in rats. GW were fermented by the lactic acid bacterium Bifidobacterium bifidum (FGWB), followed by Lactobacillus sakei LI033 (FGWBL). To induce amnesia, scopolamine (1 mg/kg) was intraperitoneally injected into rats 30 min before the behavioral tests. Step-through latencies of rats treated with primary fermented extracts (300 mg/kg, FGWB) and secondary fermented extracts (300 mg/kg, FGWBL) were significantly longer than those of rats treated with GW (300 mg/kg) in the retention trial of the multiple trial passive avoidance test. In the Morris water maze task, FGWBL significantly shortened escape latencies in training trials. Furthermore, swimming times within the target zone during the probe trial with FGWBL were significantly higher than the GW and FGWB treatments. In addition, acetylcholinesterase activities were lower in the brains of scopolamine-treated rats treated with FGWBL. These results suggest that FGWBL could be useful to enhance learning memory and cognitive function via cholinergic dysfunction.

• Journal of Applied Biological Chemistry
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• v.42 no.4
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• pp.202-204
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• 1999

Methanol extracts of leaves from 15 Pinus species belonging to the family Pinaceae were tested for their in vitro growth-inhibiting activities against 10 bacteria commonly found in the gastrointestinal tracts of human, using impregnated paper disk methods. The inhibitory activities varied with both bacterial strain and Pinus species used. At a concentration of 10 mg/disk, a clear growth inhibition was produced from the extracts of Pinus armandii, P. banksiana, P. bungeana, P. densiflora, P. rigida, and P. thunbergii against Clostridium perfringens, whereas all Pinus samples revealed weak or little growth-inhibiting activity against Escherichia coli, Bacteroides fragilis, and Staphylococcus aureus. At 5 mg/disk, the extracts of P. banksiana and P. thunbergii exhibited potent growth inhibition toward C. perfringens. All the extracts except the one from P. densiflora did not adversely affect growth of Bifidobacterium adolescentis, B. longum, B. bifidum, B. breve, B. animalis, and Lactobacillus casei. The growth-inhibiting activity was more pronounced in C. perfringens, as compared to the lactic acid-producing bacteria. These results may be an indication of at least one of the pharmacological activities of these Pinus species.

• Journal of the Korean Society of Food Culture
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• v.21 no.2
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• pp.179-186
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• 2006

To investigate the production of yogurt added with desalted bamboo shoots, the component analysis was conducted. Desalted bamboo shoots contained 82.59 % of moisture, 4.56 % of protein, 0.52 % of lipid, 0.50 % of ash and 11.72 % of total dietary fiber. The main mineral elements were Ca, P, S, Na, Mg and K. Yogurt base fermented with 0.005 % ABT-5 starter inoculum at $40\;^{\circ}C$ for 13 hr. For the preparation of bamboo shoots yogurt, various sugaring bamboo shoots were added to the yogurt base. Results of sensory evaluation of the yogurt containing bamboo shoots indicated that color, odor, taste, flesh size, flesh amount, mouth feel, and overall acceptability of the 15 %(w/v) bamboo shoots dicing $(5{\times}5{\times}5\;mm)$ showed higher preference than others. When bamboo shoot yogurt was kept at $4\;^{\circ}C$ for 15 days, pH, titratable acidity, viable counts of lactic acid bacteria and Bifidobacterium bifidum of yogurt were not changed.

• Journal of Microbiology and Biotechnology
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• v.33 no.9
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• pp.1228-1237
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• 2023

The CRISPR-Cas system has emerged as the most efficient genome editing technique for a wide range of cells. Delivery of the Cas9-sgRNA ribonucleoprotein complex (Cas9 RNP) has gained popularity. The objective of this study was to develop a quantitative polymerase chain reaction (qPCR)-based assay to quantify the double-strand break reaction mediated by Cas9 RNP. To accomplish this, the dextransucrase gene (dsr) from Leuconostoc citreum was selected as the target DNA. The Cas9 protein was produced using recombinant Escherichia coli BL21, and two sgRNAs were synthesized through in vitro transcription to facilitate binding with the dsr gene. Under optimized in vitro conditions, the 2.6 kb dsr DNA was specifically cleaved into 1.1 and 1.5 kb fragments by both Cas9-sgRNA365 and Cas9-sgRNA433. By monitoring changes in dsr concentration using qPCR, the endonuclease activities of the two Cas9 RNPs were measured, and their efficiencies were compared. Specifically, the specific activities of dsr365RNP and dsr433RNP were 28.74 and 34.48 (unit/㎍ RNP), respectively. The versatility of this method was also verified using different target genes, uracil phosphoribosyl transferase (upp) gene, of Bifidobacterium bifidum and specific sgRNAs. The assay method was also utilized to determine the impact of high electrical field on Cas9 RNP activity during an efficient electroporation process. Overall, the results demonstrated that the qPCR-based method is an effective tool for measuring the endonuclease activity of Cas9 RNP.

• The Korean Journal of Food And Nutrition
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• v.26 no.1
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• pp.137-145
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• 2013

Biological activities of wax gourd (Benincase hispida) extract and lactic acid bacteria (Lactobacillus casei and Bifidobacterium bifidum) were investigated in this study. Wax gourd extract reduced the activity of angiotensin-converting enzyme (ACE) by 47.9%, of tyrosinase by 13.2%, and had an anti-oxidant activity of 23.4%. Oral administration of wax gourd extract for 72 hours improved the symptom of loose bowels for 120 patients with its highest improvement rates within 6 to 12 hours. The improvement rates were standardized by the curative state by 80%. Lactic acid bacteria preparations reduced the activity of ACE by 21.49%. Oral administration of lactic acid bacteria preparations for 72 hours improved the symptom of loose bowels for 108 patients with its highest improvement rates after 24 hours. On the basis of these results, the tablets containing both wax gourd extract and lactic acid bacteria preparations for the improvement of irritable bowel syndromes were developed. The tablets reduced the activity of ACE by 27.1% and exhibited an anti-oxidant activity of 20.3%. Treatment of the tablets at 100 ${\mu}g/m{\ell}$ and 250 ${\mu}g/m{\ell}$ for 24 hours inhibited the growth of A549 human lung cancer cells by 67%, which was much higher than that of each wax gourd extract or lactic acid bacteria. In addition, treatment of the tablets at 100 ${\mu}g/m{\ell}$ for 24 hours reduced the growth of HCT-116 human colon cancer cells by 70%. Oral administration of the tablets to the patients with loose bowels led to higher improvement rates and speed than each wax gourd extract or lactic acid bacteria. Oral administration of the tablets to the patients with irritable bowel syndromes of loose bowels, constipation, or general type for 72 hours improved their symptoms by 100% with the highest improvement rates within 3 to 6 hours. Furthermore, the improvement rates and speed by the tablets was much higher than each wax gourd extract or lactic acid bacteria.

• Journal of the Korean Society of Food Science and Nutrition
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• v.46 no.9
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• pp.1071-1080
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• 2017

This study examined the adhesiveness of beneficial intestinal bacteria to whole-grains using confocal scanning laser microscopy (CLSM), to demonstrate the prebiotic effects of whole-grains, and to develop prebiotic puffed snacks with these whole-grains. CLSM has been used to observe the adhesiveness of Lactobacillus acidophilus, which belongs to beneficial intestinal bacteria, to whole-grain powders using optical sectioning techniques. The enhanced effects on the growth of beneficial intestinal bacteria with the hot water grain extract were verified using an indirect count method. Finally, a puffed snack was produced with the prebiotic effect and the quality was evaluated by checking the chromaticity and degree of hardness. As a result, L. acidophilus exhibited adhesive ability to whole-grain powders and growth of selected beneficial intestinal bacteria were improved significantly. The Hunter L value of the developed puffed snack increased when seasoning was added. The hardness of the puffed snack with seasoning was higher than that of the control. The results of a sensory evaluation showed that the puffed snack with seasoning was highly rated in the overall preference compared to the control.

• Korean Journal of Food Science and Technology
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• v.41 no.6
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• pp.673-680
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• 2009

This study was conducted to screen for plant food materials that improve human intestinal microflora, especially microorganisms associated with obesity. Among 30 tested plant food materials, the extract of Schizandra chinensis inactivated Eubacterium limosum, Bacteroides fragilis and Clostridium spp. Additionally, S. chinensis extract was also found to have a growth-promoting effect on Bifidobacterium spp.. The antimicrobial activity and antioxidant activity of the water extract did not decrease in respond to heating. Additionally, the water extract of S. chinensis did not show a toxic effect on the growth of Caco-2 cells. In vivo feeding tests were performed to investigate the influence of extract on the intestinal microflora in rats. Although the extract did not reduce obesity induced by a high fat diet, it led to significant increase in the population of Bifidobacterium spp. and a decrease in the population of Clostridium spp. in rats. Taken together, these results indicate that S. chinensis could be useful as a functional food component to control intestinal microbial flora.