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Chitosan 과 Alginic Acid 를 이용한 캡슐형 비료 및 제초제의 투과특성
이근태(Keun Tai Lee),김상무(Sang Moo Kim),박성민(Seong Min Park),손병일(Byung Yil Son),김형섭(Hyoung Seub Kim),이상호(Sang Ho Lee) 한국수산과학회 1997 한국수산과학회지 Vol.30 No.2
Effects of the concentration of NaCl, the concentration and the molecular weight of chitosan on the permeability of capsule type fertilizer and herbicide were investigated, The encapsulating process was based on the electrostatic interaction between chitosan (a polycationic polymer) and sodium alginate (an anionic polysaccharide). Sodium alginate solution (1%) was dropped into chitosan solution (1%) in which various amounts of NaCl was added. The capsule strength was increased with the addition of NaCl and the maximum value of capsule strength was observed at 0.3M NaCl. Capsule type fertilizer and herbicide were immersed in deionized water to determine its permeability, and it was affected by the concentration of NaCl and chitosan, and the molecular weight of chitosan. As the concentration of NaCl in chitosan solution increased, permeability of the capsule increased and marked the maximum value of 88% (fertilizer), 87% (herbicide) at 0.75M NaCl. As concentration of chitosan solution increased, permeability tended to decreased; it showed the maximum value of 90% (fertilizer) and 90.3% (herbicide) at 0.25% chitosan and the minimum value of 83% (fertilizer) and 82% (herbicide) at 1% chitosan. Permeability of fertilizer and herbicide also decreased, as the molecular weight of chitosan (material of capsule) was decreased; it was showed 86% (fertilizer) and 83% (herbicide) at M.W 330,000 (sonication time 0min) and 52 (fertilizer) and 51% (herbicide) at M.W 119,000 (sonication time 180 min). The chitosan-alginic acid capsule was manufactured (defined as prepared capsule), dried for 6 hrs and immersed in deionized water (defined as restored capsule) to examine restoration of capsule. Restoration of capsule was good, and capsule strength was slightly decreased form 20 g/㎠ (prepared capsule) to 17 g/㎠ (restored capsule).
게껍질에서 추출한 chitosan 필름의 이용에 관한 연구 2. Chitosan 코팅처리한 토마토의 품질변화
이근태(Keun Tai Lee),박성민(Seong Min Park),손병일(Byung Yil Son),김형섭(Hyoung Seub Kim) 한국수산과학회 1999 한국수산과학회지 Vol.32 No.5
Coating with chitosan(2%, pH:5.0) had a beneficial such as less weight loss, flesh firmness and maintenance of sugar content of tomatoes stored at the normal temperature. The weight loss of chitosan-coated tomatoes was 4.8% during the storage period(18days) while that of control was 10.2%. When it was stored for 18 days, the tomatoes coated with chitosan showed higher in firmness (1.63㎏) and pectin content (0.58g%) than the control (1.03㎏, 0.44g%). For the total soluble acid and pH, the tomatoes coated with chitosan were higher in oxalic acid (0.17g%) than the control (0.15g%) and the latter were higher in the pH then the former, when they were stored for 18 days.
게껍질에서 추출한 chitosan 필름의 이용에 관한 연구 1. 도포재로써의 chitosan 물성에 영향을 미치는 인자
손병일(Byung Yil Son),박성민(Seong Min Park),김형섭(Hyoung Seub Kim),이근태(Keun Tai Lee) 한국수산과학회 1999 한국수산과학회지 Vol.32 No.4
Chitin was isolated from red snow crab (Chinonecetes japonicus) and deacetylated by boiling alkaline solution to produce chitosan. The physical properties of chitosan solution and its film properties was examined. As the molecular weights of chitosan was increased from 297Kpa to 319Kpa, the tensile strength, degree of elongation and water permeability of chitosan film were increased. As the degree of deacetylation of chitosan was increased, the tensile strength, the degree of elongation and water permeability of chitosan film were increased. As the concentration of chitosan solution was increased, the degree of elongation and water permeability of film were increased, whereas the tensile strength of film was decreased. As the pH of chitosan solution was increased, the tensile strength and water permeability of film were decreased, whereas the degree of elongation of film was increased.