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최윤희,이상복,김명숙 ( Yoon Hee Choi,Sang Bok Lee,Myeong sook Kim ) 한국응용생명화학회 1997 Applied Biological Chemistry (Appl Biol Chem) Vol.40 No.2
To improve the quality and prolongation of chopped ginger, they were treated with NaCl, citric acid, ascorbic acid alone or combination of them at 5℃. The browning and stink of chopped ginger were prevented by adding 10% NaCl, 0.5∼2.0% citric acid, but the control became severely browned and deteriorated after 1 month storage. The application of 0.5% citric acid maintained citrine color and decreased the activity of polyphenol oxidase(PPO) more significantly compared to 5.0% NaCl or 0.5% ascorbic acid. Ascorbic acid treatment become browned at 1.0∼2.0% and easily deteriorated compared to citric acid. Citric acid(0.5%) or ascorbic acid (0.5%) treatment was largely variation of pH compared to NaCl(5.0%)+citric acid(0.5%) or NaCl(5.0%)+ascorbic acid(0.5%) treatment during 8 month storage. The activity of PPO in NaCl(5.0%)+ascorbic acid(0.5%) treatment was elevated after 4 month storage. In chopped ginger, NaCl(5.0%)+citric acid(0.5%)+ascorbic acid(0.25%) treatment was more effective than 5.0%+0.1%+0.1%, 5.0%+0.5%+0.1% during 12 month storage.
볏짚 사료가치 증진을 위한 알카리성 과산화수소의 적정 처리수준
최윤희(Yoon Hee Choi),김명숙(Myeong Sook Kim),홍재식(Jai Sik Hong) 한국응용생명화학회 1994 Applied Biological Chemistry (Appl Biol Chem) Vol.37 No.5
These studies were conducted to investigate the chemical composition changes in in vitro digestibility for the improvement of nutritive value of rice straw by alkaline hydrogen peroxide. The content of neutral detergent fiber (NDF), acid detergent fiber (ADF), hemicellulose, cellulose and lignin in rice straw was decreased with higher level of H₂O₂ (pH 11.5). The content of ADF, cellulose and ash of the rice straw washed after H₂O₂ (pH 11.5) treatment tended to be increased but NDF, hemicellulose and lignin were decreased with higher concentration of H₂O₂ (pH 11.5). In the rice straw washed after alkaline hydrogen peroxide treatment the decomposition of cellulose and lignin was effective in pH 11.5∼12.5, in smaller cutting size and 55℃. The in vitro organic matter digestibility was increased with higher H₂O₂ concentration and smaller cutting size of rice straw.
최윤희(Yoon Hee Choi),이상복(Sang Bok Lee),김명숙(Myeong Sook Kim),홍재식(Jai Sik Hong) 한국응용생명화학회 1994 Applied Biological Chemistry (Appl Biol Chem) Vol.37 No.5
Pleurotus Florida with high cellulase activity as well as lignin degradability was selected out among strains for fermentation of the rice straw to improve the nutritive value. When the rice straw was fermented by P. florida, the contents of hemicellulose, cellulose and lignin were decreased to 22.5%. 11.4% and 28.1%, respectively, whereas the contents of rice straw fermented after pretreatment with H₂O₂ or alkaline hydrogen peroxide were decreased much in the lower concentration. The content of T-N (total-nitrogen) and crude fat was increased with the longer fermentation period. The amino acid content of rice straw fermented by P. florida in 30 days was increased to 28.9% and 35.1% as the rice straw was fermented after pretreatment without and with 4% H₂O₂, respectively. The crystalline intensity of rice straw was decreased by pretreatment with 4% H₂O₂ and fermentation by P. Florida. However, the crystall intensity was increased by treatment with alkaline hydrogen peroxide and the more when the straw was washed after the treatment. When the rice straw was fermented by P. Florida for 30 days, the in vitro organic matter digestibility was increased up to 6% of H₂O₂pretreatment.