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Leuconostoc mesenteroides KCTC3505를 이용한 발효자몽 추출물 생산 조건의 최적화 (Optimum Conditions for Production of Fermented Grapefruit Extract using Leuconostoc mesenteroides KCTC3505)

  • 홍경표
    • 동아시아식생활학회지
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    • 제21권5호
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    • pp.661-668
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    • 2011
  • This study was conducted in order to determine the optimum conditions for the production of fermented grapefruit extract showing high cell growth, antioxidant activity and total flavonoid content. Five lactic acid bacterial strains - Lactobacillus plantarum KCTC3104, Lactobacillus brevis KCTC3102, Weisella cibaria KCTC3746, Leuconostoc citreum KCTC3526 and Leuconostoc mesenteroides KCTC3505 - were evaluated first in order to determine the optimum strain able to grow with high efficiency on grapefruit as a substrate and possesses higher antioxidant activity and flavonoids content. Among these strains, L. mesenteroides KCTC3505 was selected as a starter culture. To estimate the available or effective content of grapefruit in basal medium, the effects of 30%, 50%, and 70% grapefruit contents on the performance of fermentation were tested, and it was found that grapefruit can be added at 70% levels to medium. In this study, three factors of fermentation conditions - incubation time, sucrose, and glucose contents - were evaluated for their effects on fermentation performance. Taguchi experiment design was employed and the responses of experiments were calculated using signal and noise ratio calculation with larger-the-best characteristics. Finally, the optimum conditions for the manufacture of fermented grapefruit extract were as follows: grapefruit 70%, sucrose 10 g/L, glucose 10 g/L, sodium acetate 1 g/L, NaCl 1 g/L, dipotassium phosphate 0.1 g/L, magnesium sulfate 0.01 g/L and 16 hr of incubation.

배지조성 및 배양환경 최적화에 의한 Bifidobacterium의 고농도 배양 (High Density Cell Culture of Bifidobacterium by Optimization of Medium Composition and Culture Conditions.)

  • 송수한;김택범;지근억;오훈일;오덕근
    • 한국미생물·생명공학회지
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    • 제30권1호
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    • pp.63-67
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    • 2002
  • 본 연구에서 사용된 Bifidobacterium은 모유를 섭취한 유아의 분변으로부터 분리었으며 16s rRNA 염기서열분석 결과 Bifidobacterium longum속으로 동정되어 Bifidobacterium SH2라 명명하였다. Bifidobacterium SH2의 고농도 배양을 위하여 기본 배지로 MRS 배지를 변형하여 최적화한 결과 최적 배지의 조성은 50g/L lactose, 10 g/L beef extract, 10 g/L peptone, 5 g/L yeast extract, 7 g/L sodium acetate, 2 g/L ammonium citrate, 2 g/L disodium phosphat, 1 g/L tween 80, 0.2 g/L $MnSO_4$, 0.5 g/L L-cysteine이었다. 배양조건을 최적화한 결과 pH는 5.0에서, 온도는$ 37^{\circ}C$에서 균체량이 최대로 나타났다. 배지와 배양 조건을 최적화하여 건조 균체량과 생균수가 MRS 배지 보다 각각 2.7배, 1.8배 증가한 결과를 얻었다.

Plant Growth Regulator Produced by Streptomyces sp. (Part II) Conditions of Production and Some Properties of the Plant Growth Regulator

  • 김광현;서정훈
    • 한국미생물생명공학회:학술대회논문집
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    • 한국미생물생명공학회 1978년도 추계학술대회
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    • pp.207.5-208
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    • 1978
  • Effects of the plant growth regulator (P. G. R.)on the reaction of proteinase, $\gamma-amylase$ and acid phosphatase were investigated, and also were the conditions of production of P. G. R. by Stroptomyces sp. 445. The P. G. R. had no effect on the act ivities of such enzymes in mung bean seedling. But in germinating seed previously treated with P. G. R. it effected the activity of protease in cotyledon. In the conditions of production of P. G. R., the maxim, activity was appeared in shaking cutlure at $30^{\circ}C$ for 5 days, and by the addition of peptone or casein hydrolysate as nitrogen source, soluble starch as carbon source, and sulfur as metal ion.

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산국(山菊) 에탄올 추출물의 이화학적 특성에 대한 추출조건의 최적화 (Optimization of Extraction Conditions for Physicochemical Properties of Ethanol Extracts from Chrysanthemum boreale)

  • 권중호;박난영;이기동;정용진
    • 한국식품영양과학회지
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    • 제27권4호
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    • pp.585-590
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    • 1998
  • To renew interest in Chrysanthemum boreale as a traditional food material, response surface methodology was used for optimizing extraction conditions and monitoring physicochemical properties of ethanol extracts from Chrysanthemum petal. The phenolic compounds of ethanol extracts were minimized in 87ml/g(solvent per sample), 21%(ethanol concentration), and 15 hours(extraction time). The physicochemical properties of ethanol extracts were maximized in the conditions of 115ml/g, 98% and 16 hours on yellow color intensity, 143ml/g, 75% and 19 hours on carotenoid content, and 148ml/g, 53% and 18 hours on soluble solid content. Optimum ranges of extraction condition for physicochemical properties of Chrysanthemum boreale were 130~150ml/g, 70~85% and 20~28 hours, respectively. Predicted values at the optimum extraction condition were in good agreement with experimental values.

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Bacillus polymyxa KS-1에 의한 다당류 KS-1 생산의 발효 조건 (Cultural Conditions of Exopolysaccharide KS-1 Produced by Bacillus polymyxa KS-1)

  • 권기석;윤병대주현규
    • KSBB Journal
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    • 제10권4호
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    • pp.441-448
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    • 1995
  • 토양으로부터 분리 동정된 균주인 Bacillus polymyxa KS-1을 이용하여 이들이 생산하는 미생물 생 다당듀 KS-1의 생산을 위한 배지 및 배양조건을 조사하였다. 다당류 KS-1의 생산을 위한 애지의 조성은 증류수 1 liter당 glucose 30g, yeast extract $2.5g, KH_2PO_4 2.5g, NaCl 0.5g, MgSO_4.7H_20 0.3g, CaC0_3 0.05g, FeSO_4.7H_2O 0.05g, 그리고 MnS0_4 . 4H_20 0.05g$ 이 첨가된 배지에서 높은 정성 벚 다탕류 생산 을 얻을 수 있었으며, 이때 배양조건은 초기 pH와 배양온도는 각각 7.0과 $30^{\circ}C$, C에서 다당류 생산이 가 장 좋은 갯으로 조사되였다. 또한 이상의 최적조건 에서 발효조를 이용한 경우 통기량 빛 교반속도를 각각 2vvm과 400rpm으로 조절하여 배양한 경우 생산량은 liter당 약 10.3g의 다당류 KS-1이 얻어졌다.

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4차원 반응표면분석을 통한 맥문동의 이화학적 특성 모니터링 (Monitoring on Physicochemical Properties of Liriope platyphylla by the Use of Four Dimensional Response Surface)

  • 이기동;김정옥;손준호;김학윤
    • 한국식품저장유통학회지
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    • 제19권4호
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    • pp.560-568
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    • 2012
  • 본 연구는 맥문동의 이화학적 특성을 모니터링하고 최적추출조건을 예측하고자 4차원 반응표면분석을 사용하였다. 맥문동의 추출조건에 따른 고형분 함량은 35.06~65.70%의 범위로서, 최적 추출조건이 시료에 대한 용매비 16.86 mL/g, 추출온도 $99.55^{\circ}C$ 및 추출시간 3.20 hr에서 66.02%였다. 총 페놀성 화합물 함량은 0.66~1.24 mg/g의 범위로서, 최적 추출조건이 18.78 mL/g, $97.09^{\circ}C$ 및 3.71 hr이었다. 조사포닌 함량은 2.22~6.21 %의 범위로서 최적추출조건은 시료에 대한 용매비 21.33 mL/g, 추출온도 $95.49^{\circ}C$ 및 추출시간 3.00 hr이었다. 환원당 함량의 범위는 2.34~6.51 %로서, 최대값이 6.75%이며, 추출조건은 22.93mL/g, $89.64^{\circ}C$ 및 3.75 hr이었다. 전자공여작용의 최적조건은 16.74 mL/g, $99.63^{\circ}C$ 및 3.16 hr이었다. 맥문동 유용성분인 고형분 함량, 조사포닌 함량 및 환원당 함량의 반응표면을 superimposing하여 얻은 최적 추출조건의 범위는 시료에 대한 용매비 15~23 mL/g, 추출온도 92~$100^{\circ}C$ 및 추출시간 2.4~5.0 hr로 나타났으며, 예측조건 범위내의 임의의 조건 (20 mL/g, $100^{\circ}C$, 3 hr)에서 고형분 함량 65.75%, 총 페놀성 화합물 함량 1.30 mg/g, 조사포닌 함량 6.33%, 환원당 함량 5.93%, 갈색도 0.11 및 전자공여작용 10.52%로 예측 및 확인되어 추출수율과 기능성 성분이 높은 최적 추출조건을 설정하였다.

Effect of Cultural Conditions on Polysaccharide Production and its Physicochemical Properties in Cordyceps militaris

  • Kwon, Jeong-Seok;Hong, Eock-Kee
    • 한국생물공학회:학술대회논문집
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    • 한국생물공학회 2005년도 생물공학의 동향(XVI)
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    • pp.140-143
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    • 2005
  • This study was concerned with the optimization of liquid culture conditions for mycelial growth and polysaccharide production and its physicochemical properties in Cordyceps militaris. The one factor at a time method was adopted to investigate the effects of medium composition, environmental factors and C/N ratio. Among the these varialbles, glucose 80g/L, yeast extract 10g/L, $MgSO_4{\cdot}7H_{2}O\;0.5g/L$, $KH_{2}PO_4\;0.5g/L$ were proved to be the most suitable carbon, nitrogen, and mineral sources, respectively. The optimal temperature, initial pH, working volume were identified to be $24^{\circ}C$, 7.0 and 100ml, respectively. Under the optimal conditions, the strategies in shake flask culture and 5L jar fermentor led to mycelial growth of 29.43 g/L, 28.88g/L and polysaccharide production of 2.53g/L, 6.38 g/L, respectively. Among the phisicochemical properties, relative concentrations(w/v) of total sugar, uronic acid, protein and hexoseamine were identified to be 74.07%, 1.13%, 0.91%, and 0.46%, respectively. The fraction of neutral and acidic polysaccharide were identified to be 81.9% and 18.1%, respectively.

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염 내성 변이균주 Candida magnoliae M26에 의한 에리스리톨 발효특성 (Fermentation Characteristics of Salt-Tolerant Mutant, Candida magnoliae M26, for the Production of Erythritol)

  • 이강희;서진호;유연우
    • KSBB Journal
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    • 제17권6호
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    • pp.509-514
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    • 2002
  • 발효조건의 최적화에 대한 연구결과 온도는 28$^{\circ}C$, 배지의 초기 pH는 7.0, 통기와 교반 조건은 1.0 vvm과 500 rpm에서 erythritol의 생산이 가장 우수하였다. 이러한 최적의 발효조건에서 250 g/L의 glucose와 5 g/L의 yeast extract가 포함된 발효배지에서 최대 erythritol 농도는 143.3 g/L이었으며, 이때의 수율은 57%이고 생산성은 0.70 g/L-h이었다. 발효 중에 pH를 일정하게 조절하는 경우에 erythritol의 수율 및 생산성은 향상되지 못하였다. 발효배지에 0.5 M의 NaCl 또는 KCl의 첨가에 의해서 염이 첨가되지 않은 배지에 비해 erythritol의 생산이 약간 증가를 하였다. 그러나 NaCl 또는 KCl의 첨가농도가 증가할 수록 erythritol의 생성은 감소하고, 반면에 glycerol의 생성이 증가하였다.

THE KERNELS OF THE LINEAR MAPS OF FINITE GROUP ALGEBRAS

  • Dan Yan
    • 대한수학회보
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    • 제61권1호
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    • pp.45-64
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    • 2024
  • Let G be a finite group, K a split field for G, and L a linear map from K[G] to K. In our paper, we first give sufficient and necessary conditions for Ker L and Ker L ∩ Z(K[G]), respectively, to be Mathieu-Zhao spaces for some linear maps L. Then we give equivalent conditions for Ker L to be Mathieu-Zhao spaces of K[G] in term of the degrees of irreducible representations of G over K if G is a finite Abelian group or G has a normal Sylow p-subgroup H and L are class functions of G/H. In particular, we classify all Mathieu-Zhao spaces of the finite Abelian group algebras if K is a split field for G.

The Gallai and Anti-Gallai Graphs of Strongly Regular Graphs

  • Jeepamol J. Palathingal;Aparna Lakshmanan S.;Greg Markowsky
    • Kyungpook Mathematical Journal
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    • 제64권1호
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    • pp.171-184
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    • 2024
  • In this paper, we show that if G is strongly regular then the Gallai graph Γ(G) and the anti-Gallai graph ∆(G) of G are edge-regular. We also identify conditions under which the Gallai and anti-Gallai graphs are themselves strongly regular, as well as conditions under which they are 2-connected. We include also a number of concrete examples and a discussion of spectral properties of the Gallai and anti-Gallai graphs.