• 제목/요약/키워드: Methyl-${\beta}$-cyclodextrin

검색결과 22건 처리시간 0.02초

해조류 및 흡착제의 첨가가 양파즙의 냄새에 미치는 영향 (Effect of Seaweeds and Adsorbents on Volatile Flavor Components of Onion Juice)

  • 기해진;박양균
    • 한국식품과학회지
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    • 제31권6호
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    • pp.1477-1483
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    • 1999
  • 양파의 향기성분을 보존 또는 제거할 목적으로 양파냄새를 masking하거나 제거하는 물질을 양파즙에 처리하여 관능검사를 실시하였고, pyruvate와 thiosulfinate를 측정하였으며 Solid Phase Micro Extraction(SPME)/GC법을 이용하여 휘발성 향기성분의 변화를 조사하였다. 생양파즙의 주요 향기성분은 dipropyl tetrasulfide, 1-propenyl propyl trisulfide, methyl propyl trisulfide, dipropyl trisulfide 등이었다. 다시마, 미역, 김, 규조토를 첨가한 양파즙의 휘발성 향기성분은 대조군과 비교하였을 때 모든 향기성분이 다소 감소하는 경향이었으나 활성탄과 ${\beta}-cyclodextrin$ 첨가군은 거의 모든 향기성분이 제거되었다. 여러 가지 첨가물의 농도를 달리하여 양파즙에 첨가하여 관능검사를 실시한 결과 양파 냄새는 감소하였으며 p<0.05 수준에서 유의적으로 차이가 나타났다. 해조류를 첨가한 군의 pyruvate와 thiosulfinate 함량은 대조군과 차이가 없었으나 활성탄을 첨가한 양파즙의 경우, 그 함량이 크게 감소하였다. 이상의 결과, 다시마, 미역, 김 등의 해조류 처리군은 양파의 향기성분과 매운맛 성분을 보존하면서 관능적으로 양파냄새를 masking하는 효과를 나타내었고, ${\beta}-cyclodextrin$과 활성탄은 양파에 존재하는 많은 휘발성 향기성분과 복합물을 형성하거나 홉착하여 양파냄새를 제거한 것으로 사료되어 진다.

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Identification of Essential Histidines in Cyclodextrin Glycosyltransferase Isoform 1 from Paenibacillus sp. A11

  • Kaulpiboon, Jarunee;Pongsawasdi, Piamsook
    • BMB Reports
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    • 제36권4호
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    • pp.409-416
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    • 2003
  • The isoform 1 of cyclodextrin glycosyltransferase (CGTase, EC 2.4.1.19) from Paenibacillus sp. A11 was purified by a preparative gel electrophoresis. The importance of histidine, tryptophan, tyrosine, and carboxylic amino acids for isoform 1 activity is suggested by the modification of the isoform 1 with various group-specific reagents. Activity loss, when incubated with diethylpyrocarbonate (DEP), a histidine modifying reagent, could be protected by adding 25 mM methyl-$\beta$-cyclodextrin substrate prior to the modification. Inactivation kinetics of isoform 1 with DEP resulted in second-order rate constants ($k_{inactivation}$) of $29.5\;M^{-1}s^{-1}$. The specificity of the DEP-modified reaction for the histidine residue was shown by the correlation between the loss of isoform activity and the increase in the absorbance at 246 nm of N-carbethoxyhistidine. The number of histidines that were modified by DEP in the absence and presence of a protective substrate was estimated from the increase in the absorbance using a specific extinction coefficient of N-carbethoxyhistidine of $3,200\;M^{-1}cm^{-1}$. It was discovered that methyl-$\beta$-CD protected per mole of isoform 1, two histidine residues from the modification by DEP. To localize essential histidines, the native, the DEP-modified, and the protected forms of isoform 1 were digested by trypsin. The resulting peptides were separated by HPLC. The peptides of interest were those with $R_t$ 11.34 and 40.93 min. The molecular masses of the two peptides were 5,732 and 2,540 daltons, respectively. When the data from the peptide analysis were checked with the sequence of CGTase, then His-140 and His-327 were identified as essential histidines in the active site of isoform 1.

유드라짓 및 폴리에틸렌글리콜 고체 매트릭스로 제조한 히드로코르티손 좌제의 서방성 평가 (Evaluation of Hydrocortisone Sustained-Release Suppositories Prepared with Eudragit-Polyethylene Glycol Solid Matrix)

  • 한건;김학형
    • Journal of Pharmaceutical Investigation
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    • 제20권1호
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    • pp.13-18
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    • 1990
  • Hydrocortisone (HC) sustained-release suppositories were prepared by using a solid matrix of methacrylic acid-methacrylic acid methyl ester copolymer $(Eudragit\;L_{100}^{R}:\;EL)$ as a poorly water soluble carrier and polyethylene glycole 1540 (PEG) as an water soluble carrier. HC release rate was controlled by complexation with ${\beta}-cyclodextrin$ $({\beta}-CyD)$ which was confirmed by X-ray diffractometry, IR-spectroscopy and differential scanning calorimetry. Release rate of HC from the EL-PEG matrix suppositories decreased with increase of EL contents. The release rale from $HC-{\beta}-CyD$ complex decreased in the following order: $HC-{\beta}-CyD/PEG$ > HC/PEG > $HC-{\beta}-CyD/EL_{10%}-PEG$ > $HC/EL_{10%}-PEG$ > $HC-{\beta}-CyD/EL_{15%}-PEG$ > $HC/EL_{15%}-PEG$ > $HC-{\beta}-CyD/EL_{20%}-PEG$ > $HC/EL_{20%}-PEG$. The crystallinity of HC in polymer matrix was identified using X-ray diffractometer and the surface of matrix suppositories after release test was examined by scanning electron microscopy. The sustained release of HC from these matrix suppositories was attributed to the network structure of EL.

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Effect of Alpha-Linolenic Acid with Bovine Serum Albumin or Methyl-Beta-Cyclodextrin on Membrane Integrity and Oxidative Stress of Frozen-Thawed Boar Sperm

  • Lee, Won-Hee;Kim, Wook-Hwan;Cheong, Hee-Tae;Yang, Boo-Keun;Park, Choon-Keun
    • 한국발생생물학회지:발생과생식
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    • 제23권1호
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    • pp.11-19
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    • 2019
  • The study was conducted to investigate the effects of alpha-linolenic acid (ALA) combined with bovine serum albumin (BSA) or methyl-beta-cyclodextrin (MBCD) on plasma and acrosomal membrane damages, mitochondrial activity, morphological abnormality, motility, and oxidative stress in frozen-thawed boar sperm. In previous our study, 3 ng/mL ALA had been shown protective effect during freezing process of boar sperm. Therefore, we used 3 ng/mL ALA in present study and ALA was combined with same molar ratio of BSA or MBCD (ALA+BSA and ALA+MBCD, respectively). To confirm the effect of two carrier proteins, same volume of BSA and MBCD without ALA were added during cryopreservation. Membrane damage, mitochondrial activity, reactive oxygen species (ROS) and lipid peroxidation (LPO) levels were measured using flow cytometry, and movement of sperm tail as motility parameter and morphological abnormality were observed under light microscope. In results, all of sperm parameters were enhanced by ALA combined with BSA or MBCD compared to control groups (p<0.05). Mitochondrial activity, morphological abnormality, ROS and LPO levels in ALA+BSA or MBCD groups were no significant difference compared with ALA, BSA and MBCD treatment groups. On the other hand, plasma and acrosomal membrane intact, and sperm motility in ALA+MBCD group were higher than single treatment groups (p<0.05), whereas ALA+BSA did not differ. Our findings indicate that carrier proteins such as BSA and MBCD could improve the effect of ALA during cryopreservation of boar sperm, and treatment of ALA with carrier proteins enhance membrane integrity, mitochondrial activity through reduction of ROS-induced LPO.

Immobilization of MTBE using cyclodextrins

  • Baek, Ki-Tae;Yang, Ji-Won
    • 한국지하수토양환경학회:학술대회논문집
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    • 한국지하수토양환경학회 2003년도 총회 및 춘계학술발표회
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    • pp.120-123
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    • 2003
  • Immobilization behavior of methyl tert-butyl ether (MTBE) by various cyclodextrins(CDs) was studied to investigate the feasibility of MTBE removal using cyclodexrins. Even though MTBE has relatively low hydrophobicity and higher polarity compared to other organics, it was effectively immobilized by CDs. The immobilization isotherms was shown as a type of Freundlich isotherms, and the immobilization capacity of -CDs was the largest among natural COs. The initial apparent association constant for MTBE-CD complex follows the order : gamma = beta > methyl-beta > hydroxypropyl beta > alpha. These differences of the constants are related to the size of MTBE and CDs. The size of beta-CD and gamma-CD is large to encapsulate MTBE molecule into the cavity, which that of alpha-CB is too small to encapsulate MTBE.

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생쥐 부정소 정자의 첨체반응 유도의 Calcium 비의존성 (Calcium-Independent Acrosome Reaetion by Methyl Beta Cyclodextrin in Mouse Epididymal Sperm In Vitro)

  • 최진국;계명찬
    • 한국발생생물학회지:발생과생식
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    • 제5권1호
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    • pp.53-57
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    • 2001
  • 정자의 수정능력획득과 첨체반응은 Ca$^{2+}$에 의존적으로 일어나며, 수정능력획득 과정에서는 원형질막으로부터 cholesterol이 방출되어 첨체반응이 일어나기 쉬운 상태로 전환된다. 최근 세포막으로부터 cholesterol 방출을 촉진하는 methyl beta cyclodextrin (MBCD)이 첨체반응을 유발함이 알려졌으나 정자 주변의 Ca$^{2+}$ 농도와 관계없이 cholesterol 방출만으로 첨체반응이 유발되는지의 여부는 확인되지 않았다. 본 연구에서는 생쥐 정자에서 MBCD에 의한 첨체반응의 Ca$^{2+}$ 의존성을 조사하였다. 첨가된 Ca$^{2+}$이 없는 경우에도 MBCD는 농도 의존적으로 첨체반응을 증가시켰다. 저농도 (100 ${\mu}$M)의 Ca$^{2+}$의 존재시 MBCD에 의한 첨체반응이 유의하게 증가하였다. Ca$^{2+}$을 첨가하지 않은 배양액에 100 ${\mu}$M의 EGTA를 첨가한 경우 자발적 첨체반응을 유의하게 억제되었다. 같은 조건하에서 1 mM MBCD는 첨체반응을 유의하게 증가시켰으나 EGTA 비처리군보다 유의하게 낮아 MBCD에 의해 유발되는 첨체반응에 정자내부의 Ca$^{2+}$이 관여하는 것으로 사료된다. 이상의 결과에서 외부의 Ca$^{2+}$이 존재하지 않더라도 MBCD를 이용하여 첨체반응을 유발할 수 있으며 정자 내부의 Ca$^{2+}$이 원형질막 cholesterol의 방출에 따른 첨체반응 조절에 관여함을 알 수 있다.

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전처리된 김치 부재료와 냄새 흡수 물질이 발효중 김치냄새에 미치는 영향 (Effects of Pre-treated Sub-ingredients and Deodorization Materials on the Kimchi Smell during Fermentation)

  • 구경형;김영진;구영조;최인욱
    • 한국식품과학회지
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    • 제31권6호
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    • pp.1549-1556
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    • 1999
  • 김치의 자극적인 냄새의 감소를 목적으로 김치 냄새에 영향을 주는 김치 부재료의 냄새 감소처리와 냄새 흡수 효과가 있는 물질이 김치 냄새에 미치는 영향을 조사하였다. 김치 부재료중 냄새가 강한 마늘, 생강, 파의 냄새 감소에 관한 국내외 특허를 기초로 하여 처리된 부재료를 관능검사 및 전자코에 의해 냄새를 조사 결과 냄새가 잘 유지되는 전처리 방법은 동결건조였으며, 냄새의 감소 효과가 가장 큰 구는 열풍처리구와 열처리와 침지방법을 병행한 구였다. 이들 부재료가 김치발효중 pH, 총산도 및 미생물 균수에 미치는 영향은 대조구와 처리구간에 큰 차이가 없었으며, 관능검사결과 김치 제조 직후에서 발효 10일까지는 대조구에 비하여 전처리한 부재료 첨가구는 김치냄새가 약하다고 하였으나, 발효가 더 진행되면 시료간에 차이가 없었다. 또 김치제조시 냄새를 포집하는 특성이 있어 냄새 흡수 효과를 내는 ${\alpha}-cyclodextrin$${\beta}-cyclodextrin$을 각각 0.1%씩 첨가하여 $10^{\circ}C$에서 발효시키면서 pH, 총산도 및 관능검사를 실시한 결과 발효 전반에 걸쳐 대조구와 큰 차이가 없었다. 한편 냄새 흡수 효과가 크다고 알려진 이산화염소를 주성분으로 하는 냄새 흡수제로 처리된 김치의 냄새 감소 정도를 GC/MSD로 분석한 결과 methyl allyl sulfide, dimethyl disulfide 등의 김치냄새의 주요 성분인 sulfide 류가 약 50% 정도가 감소하였고, 관능검사 결과도 대조구의 $6.5{\pm}1.80$에서 냄새 흡수제 처리구는 약 $3.8{\pm}1.17$로 유의적인 차이를 보였다.

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효소 [CGTase : Cyclodextrin glucanotransferase]의 반응 조건이 산물 [CD : Cyclodextrin]의 특이성에 미치는 영향 (The Effects of CD-product Specificity upon the Enzyme [CGTase] Reaction Condition)

  • 최희욱;홍순강
    • KSBB Journal
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    • 제19권2호
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    • pp.164-167
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    • 2004
  • 효소인 싸이클로덱스트린글루카노트란스퍼라제 (CGTase)는 효소의 활성도에 칼슘이 관련된 분자내 당 전이반응에 의해 녹말과 그에 관련된 $\alpha$-1,4-glucan의 기질을 싸이클로덱스트린으로 생성시키는 산업적으로 가장 많이 응용되는 효소 중에 하나이다. 수용성 녹말을 기질로 하여 CLEC화한 Bacillus macerans $\alpha$-CGTase 효소를 극한의 반응 조건인 계면활성제나 유기 용매가 혼합된 반응조건에서 실험한 결과, 이들 조건이 싸이클로덱스트린의 생산을 증가시키는 영향을 초래하였고 특히, 계면활성제인 SDS와 $\beta$-OG는 전체 싸이클로덱스트린의 생성을 증가시켰고 이 중에서 SDS와 Lubrol PX는 알파싸이클로덱스트린의 생성의 특이성의 결과를, 반면에 Triton x-100과 Tween 80은 알파싸이클로덱스트린의 생성을 억제하는 결과를 보였다. 유기용매인 DMSO, formamide, MPD, ethylene glycol 또한 사이클로 덱스트린의 전체 수율과 특이성에 영향을 미치는 효력을 보였다.

Effect of Polysaccharide Elicitors on the Production of Decursinol Angelate in Agelica gigas Nakai Root Cultures

  • Cho, Ji-Suk;Kim, Ji-Yeon;Kim, Ik-Hwan;Kim, Dong-Il
    • Biotechnology and Bioprocess Engineering:BBE
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    • 제8권2호
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    • pp.158-161
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    • 2003
  • Root cultures of Angelica gigas Nakai were found to be sensitive to elicitation by poly-saccharide elicitors, such as methyl-$\beta$-cyclodextrin, glucan, carboxymethyl-$\beta$-chitin, chitosan, yeast extract and pectin. For the production of decursinol angelate, ca rboxymethyl-$\beta$-chitin and glucan were found to be the most efficient elicitors. The e nhanced accumulation of decursinol angelate was proportional to the increase of the phenylalanine ammonialyase (PAL) activity after the treatment with most of the elicitors. However, carboxymethyl-$\beta$-chitin treatment did not stimulate the PAL activity, despite the 1.6-fold increase in the decursinol angelate production.

$OMP-{\beta}-CD$ 포접화합물의 물리화학적 성질, 안정성 및 피부 투과 실험 (Study of the Percutaneous Absorption, Stability and Physicochemical Properties of $OMP-{\beta}-CD$ Inclusion Complex)

  • 이상영;이계원;최현순;지웅길
    • Journal of Pharmaceutical Investigation
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    • 제27권4호
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    • pp.271-277
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    • 1997
  • Because omeprazole(OMP) is very unstable in aqueous condition, $OMP-{\beta}-CD$, the inclusion complex of OMP and ${\beta}-cyclodextrin({\beta}-CD)$ was made and physicochemical properties of it were compared with those of OMP. Skin permeability of OMP and $OMP-{\beta}-CD$ in propylene glycol vehicle and the reciprocal action of ${\beta}-CD$ with various enhancers were examined through hairless mouse. Adhesive patches were prepared with polyisobutylene and the skin permeability and stability of OMP were investigated. The inclusion complex showed higher solubility and lower partition coefficient than OMP itself. DMSO, 1-methyl 2-pyrrolidone and sodium cholate had an enhancing effect. However ethanol and polysorbate 80 hardly showed the enhancing effect of OMP. When sodium lauryl sulfate and sodium cholate as enhancer were added in patch, the former case showed higher permeability of OMP.

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