• 제목/요약/키워드: gel-state food

검색결과 49건 처리시간 0.034초

밤생율(生栗)에 함유된 Peroxidase의 정제 및 특성에 관한 연구 (Purification and Properties of the Peroxidase in Castanea Semen)

  • 오석홍;김용휘;이서나
    • 한국식품과학회지
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    • 제19권6호
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    • pp.506-514
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    • 1987
  • 밤(생율(生栗))으로 부터 peroxidase를 $(NH_4)_2SO_4$에 의한 염석 및 DEAE-cellulose column chromatography, sephadex G-100 column chromatography, HPLC방법으로 정제하였으며 정제도는 조효소에 비하여 65.3배였고, HPLC로 측정한 밤 peroxidase 분자량은 35,000으로 추정되었다. sephadexG-100 column chromatography 후 얻은 밤 peroxidase의 작용최적 pH는 5.0이었고, 작용최적 온도는 $50^{\circ}C$이었으며 $80^{\circ}C$에서 1.73분 열처리할 때 90%의 효소가 불활성화되었다. 본 효소는 OPDA 및 PPDA와 같은 방향족 amine류에 높은 활성을 나타내었다. OPDA와 $H_2O_2$에 대한 Km치는 각각 2.6mM과 10mM이었고, 저해작용은 L-ascorbic acid 와 sodium L-ascobate가 가장 컸으며, $Ca^{++}$$Ba^{++}$은 1mM과 5mM에서 현저히 효소활성을 증가시켰다.

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Purification and Characterization of Cop, a Protein Involved in the Copy Number Control of Plasmid pE194

  • Kwak, Jin-Hwan;Kim, Jung-Ho;Kim, Mu-Yong;Choi, Eung-Chil
    • Archives of Pharmacal Research
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    • 제21권3호
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    • pp.291-297
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    • 1998
  • Cop protein has been overexpressed in Escherichia coli using a T7 RNA polymerase system. Purification to apparent homogeneity was achieved by the sequential chromatography on ion exchange, affinity chromatography, and reverse phase high performance liquid chromatography system. The molecular weight of the purified Cop was estimated as 6.1 kDa by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE). But the molecular mass of the native state Cop was shown to be 19 kDa by an analytical high performance size exclusion chromatography, suggesting a trimer-like structure in 50 mM Tris-HCI buffer (pH 7.5) containing 100 mM NaCl. Cop protein Was calculated to contain $39.1% {\alpha}-helix, 16.8% {\beta}-sheet$, 17.4% turn, and 26.8% random structure. The DNA binding property of Cop protein expressed in E. coli Was preserved during the expression and purification process. The isoelectric point of Cop was determined to be 9.0. The results of amino acid composition analysis and N-terminal amino acid sequencing of Cop showed that it has the same amino acid composition and N-terminal amino acid sequence as those deduced from its DNA sequence analysis, except for the partial removal of N-terminal methionine residue by methionyl-aminopeptidase in E. coli.

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An Optimized Methodology to Observe Internal Microstructures of Aloe vera by Cryo-Scanning Electron Microscope

  • Choi, Yoon Mi;Shin, Da Hye;Kim, Chong-Hyeak
    • Applied Microscopy
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    • 제46권2호
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    • pp.76-82
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    • 2016
  • Aloe vera has been used in the pharmaceutical, food and cosmetic industry for its therapeutic properties. However, there are not many current studies on the microstructure of A. vera compared to studies on the chemical constituents and health efficacy of A. vera. Therefore, we compared the morphology of an A. vera leaf using an optical microscope, a conventional scanning electron microscope (SEM) and a cryo-SEM. Especially, this study focused on observing the gel in the inner leaf of A. vera, which is challenging using standard imaging techniques. We found that cryo-SEM is most suitable method for the observation of highly hydrated biomaterials such as A. vera without removing moisture in samples. In addition, we found the optimal analytical conditions of cryo-SEM. The sublimation conditions of $-100^{\circ}C$ and 10 minutes possibly enable the surface of the inner leaf of A. vera to be observed in their "near life-like" state with retaining moisture. The experiment was repeated with A. arborescens and A. saponaria to confirm the feasibility of the conditions. The results of this study can be applied towards the basic research of aloe and further extend previous knowledge about the surface structures of the various succulent plants.

Partial Purification of Antioxidative Peptides from Gelatin Hydrolysates of Alaska Pollock Surimi Refiner Discharge

  • Heu, Min-Soo;Park, Chan-Ho;Kim, Hyung-Jun;Park, Jae-W.;Kim, Jin-Soo
    • Fisheries and Aquatic Sciences
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    • 제12권4호
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    • pp.249-257
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    • 2009
  • This study is conducted to partially purify an antioxidative peptide in a two-step gelatin hydrolysate from Alaska pollock surimi refiner discharge, which was obtained by sequential treatment with Pronase E and Flavourzyme. The two-step gelatin hydrolysate was fractionated using chromatographic methods. Based on the same protein concentration of each fraction, the antioxidative activities (85.1-95.4%) of positive fractions fractionated by ion-exchange chromatography were higher than those (27.2-87.8%) from gel filtration. Then, further purification of the positive fractions was performed. Among them, the partially purified A1C1L2G1 and A1C1L2G2 fractions showed 96.2% and 85.1% inhibition, respectively, of linoleic acid peroxidation. The A1C1L2G1 fraction was composed of 15 kinds of amino acids and the predominant amino acids were proline, glycine and alanine. The results obtained in this study suggested that the fraction partially purified through chromatographic methods from the two-step gelatin hydrolysate of Alaska pollock surimi refiner discharge could be useful as a supplementary source for improving health functionality.

Comparison of Functional Properties of Blood Plasma Collected from Black Goat and Hanwoo Cattle

  • Shine Htet Aung;Edirisinghe Dewage Nalaka Sandun Abeyrathne;Mahabbat Ali;Dong Uk Ahn;Young-Sun Choi;Ki-Chang Nam
    • 한국축산식품학회지
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    • 제43권1호
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    • pp.46-60
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    • 2023
  • Slaughterhouse blood is a by-product of animal slaughter that can be a good source of animal protein. This research purposed to examine the functional qualities of the blood plasma from Hanwoo cattle, black goat, and their hydrolysates. Part of the plasma was hydrolyzed with proteolytic enzymes (Bacillus protease, papain, thermolysin, elastase, and α-chymotrypsin) to yield bioactive peptides under optimum conditions. The levels of hydrolysates were evaluated by 15% sodium dodecyl sulfate polyacrylamide gel electrophoresis. The antioxidant, metal-chelating, and angiotensin I-converting enzyme (ACE) inhibitory properties of intact blood plasma and selected hydrolysates were investigated. Accordingly, two plasma hydrolysates by protease (pH 6.5/55℃/3 h) and thermolysin (pH 7.5/37℃/3-6 h) were selected for analysis of their functional properties. In the oil model system, only goat blood plasma had lower levels of thiobarbituric acid reactive substances than the control. The diphenyl picrylhydrazyl radical scavenging activity was higher in cattle and goat plasma than in proteolytic hydrolysates. Ironchelating activities increased after proteolytic degradation except for protease-treated cattle blood. Copper-chelating activity was excellent in all test samples except for the original bovine plasma. As for ACE inhibition, only non-hydrolyzed goat plasma and its hydrolysates by thermolysin showed ACE inhibitory activity (9.86±5.03% and 21.77±3.74%). In conclusion, goat plasma without hydrolyzation and its hydrolysates can be a good source of bioactive compounds with functional characteristics, whereas cattle plasma has a relatively low value. Further studies on the molecular structure of these compounds are needed with more suitable enzyme combinations.

당근추출물이 인지질막 Liposome의 유동성에 미치는 영향 (The Effect of Daucus carota L. Extracts on the Fluidity of Phospholid Liposomes)

  • 신미옥;배송자
    • 한국식품영양과학회지
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    • 제30권4호
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    • pp.646-650
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    • 2001
  • 본 연구는 세포막의 유동성이 막의 항상성(homeostasis)을 유지하는 가장 기본적이며 중요한 성질이라는 점을 감안하여, 용매별로 분획한 식품의 추출물을 첨가함으로써 인지질 이중층(liposome)의 물리.화학적 성질에 미치는 막 유동성(membrane fluidity)의 변화를 열시차 열량 분석법(differential scanning calorimeter, DSC)에 의해 측정하였다. 즉 식탁의 애용식품인 당근의 용매별 분획물이 인지질 liposome에 미치는 막의 유동성에 미치는 증가효과를 본 결과, DPPC liposome에 당근의 용매별 분획물을 첨가했을 때, 일반적으로 첨가하지 않은 경우보다 첨가 농도의 증가에 따라 의존적으로 초기 상전이온도가 낮아졌고 흡열고선의 모양이 넓어졌으며 그로 인하여 협동단위($\Delta$$H_{VH}$ $\Delta$H㎈)값이 감소됨을 확인하였다. 이와 같은 현상은 일정농도의 당근분획물의 첨가가 DPPC liposome의 막유동성을 증가시킨 결과로 생각되어진다. 그리고 각 용매별 당근분획물의 유동성효과를 각각 비교해본 결과, DCSMH와 DCSMEA의 분획물첨가가 DCSMB와 DCSMA에 비해 DPPC liposome의 초기 상전이온도 및 협동단위를 더욱더 감소시켜 막유동성에 더 많은 영향을 주는 것을 확인하였다. 이와 같은 현상은 DCSMH와 DCSMEA의 분획물이 DCSMB와 DCSMA분획물의 경우보다 hydrophobicity가 더 크므로 인해 DPPC 인지질막 이중층의 acylchain쪽으로 더 깊숙히 용해하여 침투되므로서 생긴 현상이라 하겠다. 즉 당근분획물의 막유동성 증가작용은 세포막에서 일어나는 대사물, 약물, 이온 등의 운반 및 영양물의 교환, 흡수 등 생체막의 주요기능에 영향을 미치는 효과가 있는 것으로 사료되며, 앞으로 막유동성을 증가시키는 구체적 생리활성물질의 추구가 기대되어진다.

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삼성분계 그래핀/실리카/EVOH 나노 복합 코팅 필름 (Ternary Phased Graphene/Silica/EVOH Nanocomposites Coating Films)

  • 김성우
    • 접착 및 계면
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    • 제23권3호
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    • pp.94-99
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    • 2022
  • 졸-겔 공정 및 용액 블렌딩 공정을 이용하여 삼성분계(그래핀/실리카/EVOH) 나노 복합 코팅 물질을 제조하였다. SEM 관찰 및 XRD 분석을 통하여 제조된 산화 그래핀의 삽입/박리 구조뿐만 아니라 나노 복합 물질 내에서의 그래핀 나노 판상체와 실리카 입자의 박리 구조 및 분산 상태를 확인하였다. 삼성분계 나노 복합 물질로 코팅된 BOPP의 산소 차단성은 산화 그래핀 및 실리카 입자를 일정 수준의 함량으로 첨가했을 때 이성분계(실리카/EVOH) 나노 복합 코팅 필름에 비해 뚜렷하게 향상되었나, 그 이상의 함량으로 첨가하면 불완전한 박리 및 그래핀 적층체의 분산과 실리카 클러스터의 미세 크랙 발생으로 인하여 차단성이 거의 일정하거나 또는 그 증가 폭이 매우 작은 것으로 나타났다. 또한 나노 복합 코팅 필름의 투명성은 그래핀 함량에 따른 필름의 광투과율을 측정함으로써 확인하였으며, 이러한 결과로부터 식품 포장 필름으로의 적용 가능성을 제시할 수 있었다.

Dietary Supplementation with Acanthopanax senticosus Extract Modulates Gut Microflora in Weaned Piglets

  • Yin, Fugui;Yin, Yulong;Kong, Xiangfeng;Liu, Yulan;He, Qinghua;Li, Tiejun;Huang, Ruilin;Hou, Yongqing;Shu, Xugang;Tan, Liangxi;Chen, Lixiang;Gong, Jianhua;Kim, Sung Woo;Wu, Guoyao
    • Asian-Australasian Journal of Animal Sciences
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    • 제21권9호
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    • pp.1330-1338
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    • 2008
  • This study was conducted to investigate the effects of Acanthopanax senticosus extract (ASE) as a dietary additive on gut microflora in weaned piglets. A total of sixty pigs were weaned at 21 d of age (BW = $5.64{\pm}0.23kg$) and allocated on the basis of BW and litter to three dietary treatments in a randomized complete block design. The dietary treatments were: control group (basal diet), antibiotics group (basal diet+0.02% colistin), and ASE group (basal diet+0.1% ASE). On d 7, 14 and 28 after consuming the experimental diets, five piglets per group were sacrificed and then the contents from the jejunum, ileum and cecum were collected to determine changes in the microbial community by using a polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) technique and estimating the contents of Lactobacillus and E. coli by in vitro culturing methods. The results showed that the ASE promoted the microflora diversity in the cecum. Enumeration of bacteria in the gut contents showed that the number of Lactobacillus increased (p<0.05), while that of E. coli decreased (p<0.05) when compared with the other 2 groups as the days of age progressed post-weaning. These findings suggested that the ASE, as a substitute for dietary antimicrobial products, could improve the development of the normal gut microflora and suppress bacterial pathogens, and effectively promote a healthy intestinal environment.

격리된 입지환경에서 형성된 한라산 흑오미자 자생군락의 유전변이 (Genetic Variation of Natural Populations of Schisandra nigra in Mt. Halla)

  • 이갑연;이석우;김세현;김판기;정동준;한상섭
    • 한국농림기상학회지
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    • 제3권1호
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    • pp.30-36
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    • 2001
  • 우리나라에 자생하고 있는 흑오미자 유전자원을 보존하고 육성하기 위하여, 제주도 한라산이라는 격리된 지역에 천연분포하고 있는 3개 집단을 대상으로 동위 효소분석에 의한 유전변이를 조사하였다. 1. 흑오미자 자생지 3개 집단의 4개의 동위효소에 대한 대립유전자 빈도와 분포는 6개의 유전자좌 가운데 Mdh-l과 Pgi-l을 제외한 모든 유전자좌에서 2개 이상의 대립유전자가 관측되어 Idh, Mdh-2, Mnr, Pgi-2에서 다형성을 보였다. Pgi-2를 제외한 Idh, Mdh-2, Pgi-l, Mdh-1, Mnr 유전자좌에서 동일한 대립유전자가 빈도가 가장 높은 주대립유전자로 나타났다. 2. 유전자좌당 대립유전자수(A/L)는 평균 1.7개의 값을 보였으며, 95%( $P_{95}$ ) 및 99%( $P_{99}$) 수준에서의 다형적 유전자좌의 비율은 38.9%와 50%, 평균 이형접합도의 관측치( $H_{0}$$^{./}$)와 기대치( $H_{e}$ )는 각각 0.141과 0.147로 나타났다. 흑오미자와 같이 분포구역이 매우 제한적이거나 멸종위기에 처한 식물종들은 유전변이량이 매우 적게 나타나는데 비해 흑오미자는 다소 많은 유전변이량을 보유하고 있는 것으로 나타났다. 3. 유전변이의 대부분이 집단 간 차이보다 집단내 개체간의 차이(92.6%)로 나타났으며, Wright의 F분석결과, $F_{IS}$$F_{IT}$ 값 모두 0에 가까운 값을 나타내어 흑오미자 집단이 Hardy-Weinberg 평형 상태에 근접해 있는 것으로 나타났다.다.

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