• 제목/요약/키워드: Water-soluble Chitosan

검색결과 114건 처리시간 0.02초

In vitro에서 키토산 연고의 비타민 $B_{2}$ 방출 특성 (Release Characteristics to Vitamin $B_{2}$ of Chitosan Ointments In vitro)

  • 오세영;황성규;황용현
    • 한국응용과학기술학회지
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    • 제17권1호
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    • pp.43-48
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    • 2000
  • Drug delivery system(DDS) applied to various fields, such as medicine, cosmetics, agriculture and necessities of life. Among these application fields, DDS is often used as the method of drug dosage into the epidermic skin. We investigated characters of transdermal therapeutic system(TTS) and the skin permeability of that with applying DDS. Chitosan was selected as material of TTS. We investigated the permeation of chitosan ointment containing drug in rat skin using horizontal membrane cell model. Permeation properties of materials were investigated for water-soluble drug such as riboflavin in vitro. We used glycerin, PEG 600 and oleic acid as enhancers. Since dermis has more content water(hydration) than the stratum corneum, skin permeation rate at steady state was highly influenced when glycerin was used in water-soluble drug. The permeation rate of content enhancer and drug was found to be faster than that of content water-soluble drug only. These results showed that skin permeation rate of drug across the composite was manly dependent on the property of ointment base and drug. Proper selection of the polymeric materials which resemble and enhance properties of the delivering drug was found to be important in controlling the skin permeation rate.

A Study on the Antibacterial Activity of Chitosan on the MRSA by the AATCC Test Method 100 and Modified AATCC Test Method 100

  • Choi, Jeong-Im;Jeon, Dong-Won
    • 한국의류산업학회지
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    • 제4권6호
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    • pp.557-563
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    • 2002
  • Water-soluble chitosan and water-insoluble chitosan with molecular weight of 2,000,000, 500,000, 80,000, and 40,000 with more than 90%of degree of deacetylation were produced to test antibacterial activity of chitosan against a pathogenic bacteria, Methicillin Resistant Staphylococcus aureus(MRSA). the AATCC Test Method 100and Modified AATCC Test Method 100 were used to evaluate the antibacterial activity of chitosan. Antibacterial activity of chitosan/acetic acid solution was the same when they were tested by two different methods, but those of polyester fabrics treated with chitosan/acetic acid solution were different in different antibacterial test. So several problems were found in the experimental methods. The AATCC Test Method 100 seems that excessive nutrition exists in inoculum solution by quantitative analysis on the basis the result of antibacterial activity on chitosan/acetic acid solution and amount of chitosan attached to the surface of treated fabrics.

The Water-Soluble Chitosan Derivative, N-Methylene Phosphonic Chitosan, Is an Effective Fungicide against the Phytopathogen Fusarium eumartii

  • Mesas, Florencia Anabel;Terrile, Maria Cecilia;Silveyra, Maria Ximena;Zuniga, Adriana;Rodriguez, Maria Susana;Casalongue, Claudia Anahi;Mendieta, Julieta Renee
    • The Plant Pathology Journal
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    • 제37권6호
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    • pp.533-542
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    • 2021
  • Chitosan has been considered an environmental-friendly polymer. However, its use in agriculture has not been extended yet due to its relatively low solubility in water. N-Methylene phosphonic chitosan (NMPC) is a water-soluble derivative prepared by adding a phosphonic group to chitosan. This study demonstrates that NMPC has a fungicidal effect on the phytopathogenic fungus Fusarium solani f. sp. eumartii (F. eumartii) judged by the inhibition of F. eumartti mycelial growth and spore germination. NMPC affected fungal membrane permeability, reactive oxygen species production, and cell death. Also, this chitosan-derivative exerted antifungal effects against two other phytopathogens, Botrytis cinerea, and Phytophthora infestans. NMPC did not affect tomato cell viability at the same doses applied to these phytopathogens to exert fungicide action. In addition to water solubility, the selective biological cytotoxicity of NMPC adds value in its application as an antimicrobial agent in agriculture.

저분자량 수용성 키토산이 분급화된 유전자 전달체의 제조 및 특성 (Preparation and Characterization of Low Molecular Weight Water Soluble Chitosan Gene Carrier Fractioned according to Molecular Weight)

  • 장민자;김동곤;정영일;장미경;나재운
    • 폴리머
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    • 제31권6호
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    • pp.555-561
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    • 2007
  • 다양한 분자량을 가진 저분자량 수용성 키토산을 얻기 위해 젖산염이 결합되어 있는 키토산 올리고당을 한외여과막 장치를 이용하여 분리하였고, 새로운 염 제거법으로 유리 아민기를 가진 LMWSC를 제조하였다. 젖산염이 제거된 LMWSC의 특성과 탈아세틸화도가 적외선 분광기(Infrared spectroscopy, IR) 및 핵자기공명장치($^1H-Nuclear$ Magnetic Resonance, $^1H-NMR$)에 의해 확인되었다. 분자량을 나타내는 다분산지수(PDI)는 $1.278{\sim}1.499$로 비교적 좁은 분자량분포를 나타내었다. 유전자 전달체로서의 가능성을 확인하기 위하여, 성공적으로 분자량에 따라 분리된 키토산 올리고당과 염이 제거된 LMWSC의 유전자 전이효율이 293T cell을 이용하여 확인하였다. 또한 유전자 전이효율을 향상시키기 위해 제조된 LMWSC 유도체가 Balb/C mice를 이용하여 평가되었다.

마우스에서 경구투여한 방사성스트론튬의 제거에 대한 경구투여 카이토산과 알긴산의 효과 (Effect of Oral Ingestion of Chitosan and Alginate on the Removal of Orally Ingested Radiostrontium ($^{85}Sr$) in Mice)

  • 김희경;김광윤;범희승;최근희;김지열
    • 대한핵의학회지
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    • 제27권1호
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    • pp.130-134
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    • 1993
  • 방사성스트론튬은 원자력 사고에 의해 환경 증으로 유출가능한 핵종으로 주로 위 장관을 통해 흡수됨으로써 인체에 심각한 방사선 장애를 일으킬 수 있으므로, 위장관 흡수를 억제할 수 있는 물질에 대한 연구가 필요하다. 본 실험에서는 마우스에서 장기간 복용시킨 수용성 및 불용성 카이토산과 수용성 및 불용성 알긴산이 방사성스트론튬($^{85}Sr$)의 체외배출을 어느 정도 촉진시킬 수 있는 지를 알아보고자 하였다. 각 군당 10마리씩을 웅성 마우스(NIH계)에 7일간 l0% 불용성, 수용성 카이토산과 10% 불용성 및 수용성 알긴산을 보통 식이에 섞어먹인 후, $^{85}Sr$ 74KBq ($2{\mu}Ci$)을 구강위관을 통하여 투여하였으며, $^{85}Sr$ 투여후 7일 동안 카이토산과 알긴산을 같은 방법으로 복용시키면서 매일 변을 통해 배설되는 방사능을 감마카운터로 계측하고, 7일후 도살부검하여 신체 장기별 $^{85}Sr$ 침착량을 계측하였다. 변을 통한 $^{85}Sr$의 배설은 카이토산 및 알긴산을 투여하지 않은 대조군에 비해 수용성카이토산, 불용성알긴산, 수용성알긴산, 불용성카이토산 처리군 순서로 유의하게 나타났으나, 각 처리군 간에는 유의한 차이가 없었다. $^{85}Sr$은 주로 골조직에 침착되었으며, 카이토산 및 알긴산 처리에 의한 $^{85}Sr$의 골조직 침착은 각 처리군이 대조군에 비해 유의하게 저하되었다(p<0.01). 결론적으로 l0%불용성, 수용성 카이토산과 10% 불용성 및 수용성 알긴산은 구강을 통해 유입되는 방사성스트론튬의 체내 흡수를 저하시키는데 있어서 효과적인 약제로 사용될 수 있으리라 사료된다.

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수용성 키토산분해물질을 침지액으로 이용한 두부의 저장성 증대 (The Extension of Tofu Shelf-Life with Water-Soluble Degraded Chitosan as Immersion Solution)

  • 전기환;김병용;손태일;함영태
    • 한국식품과학회지
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    • 제29권3호
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    • pp.476-481
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    • 1997
  • 두부의 저장성에 미치는 수용성 키토산 분해물질의 영향을 알아 보기 위해 두부침지액으로 일반 시중 두부공장에서 사용하는 수돗물, 멸균증류수, 0.5% 키토산 분해물질, 0.5% fumaric acid, 0.5% lactic acid를 사용하여 $4^{\circ}C$에서 냉장저장하면서 pH와 탁도, 그리고 미생물상의 변화를 관찰하였다. 수용성 키토산 분해물질을 첨가한 침지액의 경우 총균수가 21일 저장시 $10^{7}\;CFU/mL$에 달해 다른 침지액에 비해 7일에서 14일의 저장기간 연장을 관찰할 수 있었다. 특히 초기 오염 미생물의 lag phase가 다른 군에 비해 상당히 길어진 것을 관찰할 수 있었다. Yeast와 mold, 그리고 E. coli의 경우도 시간이 경과됨에 따라 증가하였으며, 0.5% 키토산 분해물질 첨가 침지액의 경우가 다른 침지액의 경우보다 증가율이 적음을 알 수 있었다. 이는 수용성 키토산 분해물질의 항균효과를 잘 보여주고 있다. 초기 pH는 0.5% fumaric acid와 lactic acid의 경우 pH 4.68과 pH 5.12로 상당히 낮았으며, 수돗물과 멸균증류수, 0.5% 키토산 분해물질 첨가 침지액에서는 pH 7.2로 비슷하였고, 저장 초기에 약간 감소하다가 서서히 증가하는 경향을 보였다. 탁도의 변화는 미생물상의 변화와 연관시켜 두부가 부패된 것으로 간주되는 총균수 $10^{7}\;CFU/mL$이상에서 0.2를 초과해 탁도가 두부부패정도를 파악하는 한 척도가 될 수 있다고 판단된다. 상기 결과로부터 항균성을 가지는 수용성 키토산 분해물질을 첨가한 두부 침지액의 개발은 두부의 저장성 향상에 크게 기여할 것으로 사료된다.

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A Study on the Antibacterial Activity of Chitosan

  • Chli, In-Ryu;Park, Jeong-Im
    • 복식문화학회:학술대회논문집
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    • 복식문화학회 2003년도 International Exhibition and Workshop
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    • pp.24-25
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    • 2003
  • Water-soluble chitosan and water-insoluble chitosan with molecular weight of 2,000,000, 500,000, 80,000, and 40,000 and more than 90% degree of deacetylation were controlled to evaluate the antibacterial activity of chitosan against a pathogenic bacteria, methicillin resistant Staphylococcus aureus(MRSA), which is being issued in the world. The Shake Flask Method and Modified Shake Flask Method were used to find out the antibacterial activities of 5types of chitosan/acetic acid solution, and the other antibacterial activities test with the cotton filter treated with chitosan /acetic acid solution. Those test methods showed the great differences ,but the results of the antibacterial activites showed the same difference.

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Stimulation of γ-Aminobutyric Acid Synthesis Activity in Brown Rice by a Chitosan/Glutamic Acid Germination Solution and Calcium/Calmodulin

  • Oh, Suk-Heung
    • BMB Reports
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    • 제36권3호
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    • pp.319-325
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    • 2003
  • Changes in the concentrations of $\gamma$-aminobutyric acid (GABA), soluble calcium ions, glutamic acid, and the activity of glutamate decarboxylase (GAD) were investigated in non-germinated vs. germinated brown rice. Brown rice was germinated for 72 h by applying each of the following solutions: (1) distilled water, (2) 5 mM lactic acid, (3) 50 ppm chitosan in 5 mM lactic acid, (4) 5 mM glutamic acid, and (5) 50 ppm chitosan in 5 mM glutamic acid. GABA concentrations were enhanced in all of the germinated brown rice when compared to the non-germinated brown rice. The GABA concentration was highest in the chitosan/glutamic acid that germinated brown rice at 2,011 nmol/g fresh weight, which was 13 times higher than the GABA concentration in the non-germinated brown rice at 154 nmol/g fresh weight. The concentrations of glutamic acid were significantly decreased in all of the germinated rice, regardless of the germination solution. Soluble calcium and GAD were higher in the germinated brown rice with the chitosan/glutamic acid solution when compared to the rice that was germinated in the other solutions. GAD that was partially purified from germinated brown rice was stimulated about 3.6-fold by the addition of calmodulin in the presence of calcium. These data show that the germination of brown rice in a chitosan/glutamic acid solution can significantly increase GABA synthesis activity and the concentration of GABA.

Synthesis of (2-pyridyl)-Acetyl Chitosan and Its Antioxidant Activity

  • Li, Rong-Chun
    • 대한화학회지
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    • 제55권5호
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    • pp.756-759
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    • 2011
  • In this paper, chloracetyl chitosan (CACTS) was prepared at first. In the molecules of CACTS, there are active chlorine groups, which can take part in other reactions. Thus, number of chitosan derivatives will be obtained after chlorine is substituted. Choosing pyridine as the active group, a novel water-soluble chitosan derivative, (2-pyridyl)-acetyl chitosan (PACTS) was obtained and its antioxidant activity against hydroxyl radicals and superoxide radicals was assessed. The results indicated that PACTS had better antioxidant activity than that of chitosan, carboxymethyl chitosan (CMCTS), hydroxypropyl chitosan (HPCTS), and Vitamin C. And the $IC_{50}$ values against hydroxyl radicals and superoxide radicals were 0.31 mg/mL and 0.21 mg/mL, respectively.

키틴 및 키토산 유도체의 합성과 그 물리화학적 특성 (Syntheses of the derivatives of chitin and chitosan, and their physicochemical properties)

  • 변희국;강옥주;김세권
    • Applied Biological Chemistry
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    • 제35권4호
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    • pp.265-271
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    • 1992
  • 키틴과 키토산으로부터 carboxymethylchitin, acetylchitin, ethylchitosan, N-acetylchitosan 및 chitosansulfate를 합성하여 그 물리화학적 기능특성을 키틴 및 키토산과 비교 검토 하였다. Carboxymethylchitin은 물과 아세트산에 용해되었지만 ethylchitin은 아세트산에만 용해되었다. 보수력은 N-acetylchitosan이 1194%로 키틴에 비해 약 2배 정도 높았으며, 지방흡수력은 carboxymethylchitin이 1800%로 키틴 511%에 비해 월등히 높았다. Carboxymethylchitin의 유화성이 75.91%로 가장 높았으며 그 다음이 미세결정형 키틴으로 57.02%였으나 키틴 및 키토산은 유화성이 나타나지 않았다. 색소흡착능은 acetylchitin이 0.93 mg dye/g sample(Blue R-250), 0.96 mg dye/g sample(Red-2)로 키틴 및 키토산 보다 높았다. 따라서 carboxymethylchitin은 유화제로서, acetylchitosan은 색소흡착제로서 이용이 가능할 것으로 판단된다.

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