• Journal of Microbiology and Biotechnology
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• 제32권7호
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• pp.892-901
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• 2022

The rising demand for carotenoids can be met by microbial biosynthesis as a promising alternative to chemical synthesis and plant extraction. Several species of lactic acid bacteria (LAB) specifically produce C₃₀ carotenoids and offer the added probiotic benefit of improved gut health and protection against chronic conditions. In this study, the recently characterized Lactiplantibacillus plantarum subsp. plantarum KCCP11226^T produced the rare C₃₀ carotenoid, 4,4'-diaponeurosporene, and its yield was optimized for industrial production. The one-factor-at-a-time (OFAT) method was used to screen carbon and nitrogen sources, while the abiotic stresses of temperature, pH, and salinity, were evaluated for their effects on 4,4'-diaponeurosporene production. Lactose and beef extract were ideal for optimal carotenoid production at 25℃ incubation in pH 7.0 medium with no salt. The main factors influencing 4,4'-diaponeurosporene yields, namely lactose level, beef extract concentration and initial pH, were enhanced using the Box-Behnken design under response surface methodology (RSM). Compared to commercial MRS medium, there was a 3.3-fold increase in carotenoid production in the optimized conditions of 15% lactose, 8.3% beef extract and initial pH of 6.9, producing a 4,4'-diaponeurosporene concentration of 0.033 A₄₇₀/ml. To substantiate upscaling for industrial application, the optimal aeration rate in a 5 L fermentor was 0.3 vvm. This resulted in a further 3.8-fold increase in 4,4'-diaponeurosporene production, with a concentration of 0.042 A₄₇₀/ml, compared to the flask-scale cultivation in commercial MRS medium. The present work confirms the optimization and scale-up feasibility of enhanced 4,4'-diaponeurosporene production by L. plantarum subsp. plantarum KCCP11226^T.

• Journal of Dairy Science and Biotechnology
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• 제41권4호
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• pp.211-218
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• 2023

This study aimed to identify lactic acid bacteria isolated from eight fermented milk products in Iran. We enumerated Lactobacillus species using De Man-Rogosa-Sharpe (MRS)-maltose and MRS agar with pH adjusted to 5.2, as well as assessment at 37℃ for 48 hr, studied Streptococcus spp. using M17 agar at 43℃ for 24 hr, and assessed Bifidobacterium species using nalidixic acid, paromomycin sulfate, neomycin sulfate, and lithium chloride (BL-NPNL) agar at 37℃ for 48 hr. The total viable Streptococcus spp. cell in fermented milk varied at 4.73-8.83 log CFU/mL. However, Bifidobacterium spp. were not detected in any of the tested samples. Lactobacilli were not detected in four of the eight samples, and viable Lactobacilli cells in the remaining four samples ranged 2.48-3.85 log CFU/mL. The pH of the tested samples ranged 3.53-4.19, and soluble solids (Brix measurement) ranged 7.5%-17.9%. A total of 130 isolates of gram-positive catalase-positive bacteria were characterized at the species level using 16S rRNA sequencing. Sequence analysis identified six species: Streptococcus thermophilus, Lactobacillus delbrueckii subsp. sunkii, Lactobacillus delbrueckii subsp. indicus, Lactiplantibacillus plantarum, Lacticaseibacillus rhamnosus, and Levilactobacillus brevis.

• 한국미생물·생명공학회지
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• 제51권4호
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• pp.465-473
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• 2023

본 연구에서는 볶음 쓴메밀 '황금미소' 분말을 첨가한 배지에 단일 및 복합 프로바이오틱스를 배양하여 쓴메밀 주요성분인 rutin의 quercetin으로 생물전환능과 이의 항산화, 항염 생리활성을 평가하였다. 단일 균주 배양 시 생물전환률은 각각 LP3 89%, SL6 84%, ST3 87%로 보였으며, 프로바이오틱스 3종 복합 배양 시 97%로 단일균주와 비교하여 유의적으로 증가하였다. 배양 전 배양액과 3종의 단일 균주 배양 및 복합 균주 배양액에서 DPPH, ABTS 분석 결과, 3종 프로바이오틱스 복합 균주 배양 시 항산화 활성이 유의적으로 증가하였다. 또한, LPS에 의해 유도된 RAW 264.7 세포의 염증반응 분석결과, 산화질소 생성능, iNOS와 TNF-α의 mRNA 발현, IL-6와 IL-4 사이토카인 분비능이 3종 프로바이오틱스 복합 균주 배양 시 가장 우수한 효능을 확인하였다. 이상의 결과는 쓴메밀 혹은 rutin이 풍부한 천연물과 이의 생물전환이 가능한 CBT LP3, SL6, ST3의 복합 섭취가 rutin 성분의 quercetin으로 전환 및 항염, 항산화 등의 생리활성 효력 증대에 영향을 줄 수 있을 것으로 판단된다.