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이산화염소 처리가 저장 중 양송이버섯(Agaricus bisporus Sing)의 품질 및 미생물학적 변화에 미치는 영향
구경주(Kyoungju Ku),마유현(Yuhyun Ma),신희영(Heeyoung Shin),이승환(Seunghwan Lee),박재현(Jaehyun Park),김란희(Lanhee Kim),송경빈(Kyung Bin Song) 한국식품영양과학회 2006 한국식품영양과학회지 Vol.35 No.7
양송이버섯을 5, 10, 50 ppm 이산화염소 용액 처리하여 실온과 4℃ 각 저장기간 중 중량변화, polyphenol oxidase 활성, 미생물에 대한 살균효과를 측정하였다. 중량감모율의 경우 저장기간이 경과할수록, 이산화염소 처리농도가 증가함에 따라 대조구에 비하여 중량감모율이 감소하였다. Polyphenol oxidase 활성은 실온의 경우 이산화염소 처리에 의해 저장 2일까지 일시적으로 증가하다 다시 감소하였는데, 4℃의 경우 이산화염소의 농도가 증가할수록 polyphenol oxidase 활성이 감소하는 것을 확인할 수 있었다. 호기성균수는 이산화염소 처리농도에 따른 큰 차이는 없었으나 4℃의 경우 10일째 대조구는 3.72×10? CFU/g, 50 ppm의 경우 1.66 ×10? CFU/g으로 차이를 보였다. 효모 및 곰팡이의 경우, 이산화염소 처리농도가 증가할수록 대조구에 비해 효모 및 곰팡이수가 감소하는 것을 확인할 수 있었다. 따라서 이산화염소 처리는 양송이버섯의 미생물학적 안전성을 증가시키며, 품질을 유지함으로써 shelf life 증대에 도움을 준다고 판단된다. Effects of chlorine dioxide (ClO₂) on weight loss, polyphenol oxidase activity, and microbial change of fresh mushrooms (Agricus bisporus Sing) were investigated. Mushrooms were treated with 5, 10, and 50 ppm of ClO₂ solution. Mushrooms were stored at room temperature and 4℃. Weight loss for ClO₂ treated mushrooms was smaller than that of the control group. Polyphenol oxidase activity of the ClO₂-treated samples stored at room temperature increased until day 2 of storage and then decreased, and the activity of the samples stored at 4℃ decreased with increase of ClO₂ concentration. Mushrooms treated with ClO₂ solution had lower aerobic bacteria, yeast and mold counts than the control during storage. Aerobic bacterial counts for 50 ppm of ClO₂ treatment at 4℃ increased from 1.62×10<SUP>2</SUP> CFU/g to 1.66×10? CFU/g at day 10 of storage, while control groups were from 1.00×10<SUP>3</SUP> CFU/g to 3.72×10? CFU/g. These results indicate that ClO₂ treatment could be useful in improving the quality and microbial safety of mushrooms.
Physical Properties of Gelidium corneum Films Treated with Cinnamaldehyde
Kyung Bin Song,Kyoungju Ku,Yungbum Seo 한국식품영양과학회 2007 Preventive Nutrition and Food Science Vol.12 No.2
Gelidium corneum films were prepared using cinnamaldehyde as a cross-linking agent and their physical properties were determined. Tensile strength (TS) value of the film containing 0.01% cinnamaldehyde was higher than the control by 8.31 MPa. However, increasing cinnamaldehyde from 0.01% to 0.1% significantly decreased TS from 9.54 MPa to 0.03 MPa, and no film was formed at 1% cinnamaldehyde. On the contrary, when cinnamaldehyde content was increased from 0.01% to 0.1%, % elongation was increased from 1.44% to 2.75%. Water vapor permeability (WVP) of the film containing 0% and 0.01% cinnamaldehyde were 1.64 ng m/m2sPa and 1.42 ng m/m2sPa, respectively. There was no significant difference in Hunter values among treatments. Scanning electron microscopy results revealed that both cinnamaldehyde and control films had similar surfaces. These results suggest that 1.5% Gelidium corneum treated with 0.01% cinnamaldehyde should be the most suitable condition for film formation.