Journal of the Korean Society of Food Science and Nutrition (한국식품영양과학회지)

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Effects of PEG (Polyethylene Glycol) Concentration and Mixing Ratio of PEG/Gly (Glycerol) on the Physical Properties of Silk Fibroin Films

PEG(polyethylene glycol) 농도와 PEG/Gly(glycerol) 흔합비에 따른 견 피브로인 필름의 물성

  • Ma, Yu-Hyun (Dept. of Food Science & Technology, College of Agriculture & Life Sciences, Chungnam National University) ;
  • Song, Kyung-Bin (Dept. of Food Science & Technology, College of Agriculture & Life Sciences, Chungnam National University)
  • Published : 2006.01.01
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Abstract

To study the effects of plasticizer concentration and its ratio on the physical properties of silk fibroin films, polyethylene glycol (PEG) was used at 4 different concentrations; 1, 2, 3, $4.5\%$ (w/v). Tensile strength (TS) and water vapor permeability (WVP) increased with the increase of PEG concentration, while opposite trend was observed for percent elongation of silk fibroin films. WVP of silk fibroin films increased from $2.54\;ng{\cdot}m/m^2spa$ for $1\%$ of PEG to $5.41\;ng{\cdot}m/m^2sPa$ for $4.5\%$. In addition, a mixture of PEG and glycerol (Gly) as a plasticizer was used at the ratio of 100:0, 75:25, 50:50, 25:75, and 0:100 (w/w). Percent elongation of the films was improved to $130.95\%$ when the ratio of 75:25 was used. On the contrary, WVP of silk fibroin films increased with the decrease of the ratio of PEG:Gly. Effect of the plasticizer concentration and its ratio on the color of silk fibroin films was negligible. These results suggest that mixture of PEG and Gly as a plasticizer provide more flexible than PEG alone in silk fibroin films, and the best ratio of PEG to Gly was 75:25.

견 피브로인 용액 에 PEG를 농도 별로 처리하거나 PEG와 Gly를 혼합하여 사용하여 필름을 제조한 뒤 그 물성을 측정하였다. PEG의 농도가 $1\%$인 견 피브로인 필름에서 32.54 Mpa로 가장 높은 인장강도를 나타냈고, PEG의 농도가 높아 질수록 인장강도는 감소하였다. 인장강도와는 반대로 PEG의 농도가 증가할수록 신장률은 증가하는 경향을 보였는데 PEG의 농도가 $3\%$서 $4.5\%$로 증가할 때 $350\%$ 이상의 높은 증가율을 보였고 또한 투습도의 경우 $66\%$ 증가하였다. PEG와 Gly의 비율을 다르게 한 경우 인장강도는 PEG:Gly의 비가 100:0일 때 13.72 Mpa로 가장 높았고, 0:100일 때 4.58 Mpa로 가장 낮았다. 이에 반하여 신장률은 PEG:Gly의 비가 75:25일 때 $130.95\%$로 가장 높게 나타났다. 투습도의 경우 Gly만을 넣어 만든 경우 $5.13\;ng{\cdot}m/m^2s$ Pa로 투습도가 가장 높게 나타났고 Gly의 비가 높아질수록 투습도가 증가하는 경향을 보였다. 전체적인 Hunter L, a, b와 ${\Delta}E$ 값은 PEG 농도와 PEG:Gly의 혼합하여 만든 필름 사이에 뚜렷한 차이가 없었다. 본 실험 결과 견 피브로인 필름의 가소제로써 PEG와 Gly를 혼합하여 사용할 경우 PEG만을 사용하여 만든 필름보다 신장률이 크게 증가하며, 또한 PEG와 Gly을 75:25의 비로 흔용하여 사용한 경우가 Gly의 첨가로 투습도가 조금 증가하기는 하였으나 인장강도는 상업용 LDPE (low density polyethylene)와 유사한 수치를 나타내면서도 높은 신장률을 가지고 있기 때문에 식품포장재로 활용이 가장 적합하다고 판단된다.

Keywords

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