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윤예리,한기영,김정환,오세연,노봉수 서울여자대학교 자연과학연구소 2005 자연과학연구논문집 Vol.17 No.-
대두유를 160, 190, 220℃에서 가열하면서 3시간 또는 4시간 간격으로 시료를 취하여 6개의 metal oxide sensor로 구성된 전자코와 2세대 전자코인 GC-SAW를 바탕으로 한 전자코를 사용하여 분석하였다. 주성분 분석결과 가열처리시간과 온도가 증가할수록 제1 주성분 값이 감소하는 것을 볼 수 있었다. 즉, 초기의 열처리를 하지 않은 신선한 대두유와 가열처리된 대두유를 구분할 수 있었다. 특히 190℃와 220℃의 높은 온도에서는 3시간 내지 4시간이면 대두유의 산패가 많이 진행됨을 알 수 있었다. 또한 GC-SAW를 바탕으로 한 전자코를 이용한 결과도 가열온도와 시간이 증가할수록 peak의 수와 면적이 증가함으로써 열처리시간에 따른 패턴 변화를 확인할 수 있었다. 이것으로 대두유의 가열처리에 따른 산패취의 변화를 측정하기 위한 간단한 방법으로 사람의 코처럼 미묘하고 복잡한 향기와 냄새성분을 감지할 수 있는 전자코로 평가할 수 있음을 확인하였다. The discrimination of the heated soybean oil was investigated by using electronic nose. Volatile components from these products were discriminated by six metal oxide sensors. Principal component analysis showed the differences between non-heated soybean oil and heated soybean oil. The first principal component score in soybean oil was reduced from +0.369 score to -0.242 score as the heating time increased. As heating temperature increased, the ratio of resistance decreased, indicating that rancidity of soybean oil increased at high heating temperature. As an alternative, electronic nose based on GC with SAW(surface acoustic wave) sensor was used for discrimination of heated soybean oil. High resolution olfactory imaging, called VaporPrint^(TM), was shown to be particularly useful for evaluating oil quality in its entirety. The result of electronic nose showed significant changes in volatile profiles from soybean oil. Also, peak numbers and areas increased as high heating time and temperature. Analysis using electronic nose with pattern recognition was rapid and simple. And this technique could be an efficient method to predict shelf-life and evaluate quality in food.
Aye Aye Myint,임원규,남좌민,김재훈,이윤우 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.66 No.-
We report the synthesis of water-soluble and environmentally friendly fluorescent carbon dots (CDs) using the renewable resource lignin as a precursor, which is a waste emitted from pulp and paper industries and lignocellulosic biofuel production, using a compressed liquid CO2 antisolvent method followed by carbonization and chemical oxidation with an acid mixture (H2SO4:HNO3 = 1:3, v/v) at 90 °C for 8, 16, and 24 h. The as-synthesized CDs emitted bright yellow fluorescence (FL) under argon laser excitation at 458 nm with excitation-wavelength-independent and excitation-wavelength-dependent FL emission characteristics. Moreover, the CDs exhibited excellent stability in a highly concentrated NaCl solution, photostability with pH-dependent FL emission activities, and cellular imaging capability with very low cytotoxicity. Notably, the FL emission intensities of the as-synthesized CDs increased with longer reaction times, indicating high degree of oxidation on the CD surface and consequently, high quantum yield of 13% was achieved. Therefore, the as-synthesized CDs can be used as promising fluorescent probes for bioimaging applications in vitro and in vivo.
Aye Aye Khaing,Yong-Jin Park 한국육종학회 2013 한국육종학회 심포지엄 Vol.2013 No.07
Preharvest sprouting (PHS) not only causes reduction of grain yield, but also affects the quality of grains, resulting into significant economic losses. PHS is governed by multiple genes. Little is known about the large genetic variation of preharvest sprouting in rice. In the present study, genetic variations of four PHS genes, OsVP1, Osaba1, Alpha-amylase3D and OsGA20ox1 were studied by using whole-genome resequencing data of 84 accessions of rice core set. A total of haplotype groups; 27, 29, 6 and 14, for OsVP1, Osaba1, Alpha-amylase3D and OsGA20ox1, respectively, were detected among the 84 accessions. Some new SNPs and InDels were found in exon part of PHS related genes were expected to result in amino acid changes following analysis of the genetic code variations, and the germplasm or varieties which are resistant to preharvest sprouting were explored. Based on this step, phenotyping for PHS is ongoing, and the association mapping of PHS will be conducted by using SNPs resulted from the haplotyping data. The present results will be ultimately useful to the molecular breeding for the development of PHS resistant rice cultivars.