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Dong Soo Lee(이동수),Myung Kyo Shin(신명교),Jae Hyeung Pyeun(변재형),Jin Woo Lee(이진우) 한국생명과학회 2009 생명과학회지 Vol.19 No.1
분자량이 1,283 kDa인 알긴산을 0.4 M 유기산을 사용하여 100℃에서 3시간 반응시켜 가수분해하였다. 유기산에 의하여 가수분해된 알긴산의 분자량은 7.5에서 53.2 kDa이었다. 유기산으로 가수분해된 알긴산을 구성하는 만뉴론산과 글루론산의 비율은 가수분해하지 않은 알긴산과 비교하여 큰 차이가 없었다. 사용한 유기산 중에서 알긴산을 가수분해하는 가장 효과적인 유기산은 초산이었다. 사용한 초산의 농도 및 반응시간이 증가할수록 가수분해된 알긴산의 분자량은 감소하였다. 본 연구를 통하여 가수분해된 알긴산의 분자량과 초산의 농도 및 반응시간과의 상관관계를 나타내는 관계식을 구하였다. 초산으로 가수분해한 알긴산의 pH를 조절하여 폴리만뉴론산과 폴리글루론산을 분리하였다. 초산과 반응하는 시간이 증가할수록 폴리만뉴론산에 존재하는 만뉴론산의 비율은 증가하였다. 폴리만뉴론산에 존재하는 만뉴론산의 비율은 100℃에서 0.4 M 초산과 1시간, 3시간 및 5시간 반응하였을 경우에 각각 75%, 90% 및 98%이었다. Alginate with a MW of 1,283 kDa was hydrolyzed with 0.4 M organic acids at 100℃ for 3 hr. Molecular weights of alginates hydrolyzed with organic acids ranged from 7.5 to 53.2 kDa. There was no significant difference in the molar ratio of mannuronate to guluronate in alginates hydrolyzed with organic acids. Acetic acid was found to be the most effective organic acid for hydrolysis of alginate. The MW of alginate decreased with increasing concentration and reaction time with acetic acid as a hydrolyzing agent. The correlations between the MW of hydrolyzed alginate and concentration of acetic acid as well as reaction time with 0.4 M acetic acid were plotted and the relevant equations obtained in this study. Polymannuronate and polyguluronate were isolated by pH adjustment of alginate hydrolyzed with 0.4 M acetic acid. The molar percentages of mannuronate in polymannuronates isolated from alginate hydrolyzed with 0.4 M acetic acid at 100℃ were increasing in proportional to the reaction time such as 75% for 1 hr, 90% for 3 hr, and 98% for 5 hr of reaction time.
해조류 우뭇가사리 (Gelidium amansii)의 분리당화발효를 이용한 바이오에탄올의 생산
라채훈(Chae Hun Ra),이현준(Hyeon Jun Lee),신명교(Myung Kyo Shin),김성구(Sung-Koo Kim) 한국생물공학회 2013 KSBB Journal Vol.28 No.5
The seaweed, Gelidium amansii, was fermented to produce bioethanol. Optimal pretreatment condition was determined as 94 mM H₂SO₄ and 8% (w/v) seaweed slurry at 121℃ for 60 min. The mono sugars of 40.4 g/L with 67% of conversion from total carbohydrate of 60.6 g/L with 80 g dw/L G. amansii slurry were obtained by thermal acid hydrolysis pretreatment and enzymatic saccharification. G. amansii hydrolysate was used as the substrate for ethanol production by Kluyveromyces marxianus KCTC 7150 and Candida tropicalis KCTC 7212 using 5L fermentor. The ethanol productions by K. marxianus KCTC 7150 and C. tropicalis KCTC 7212 were 17.8 g/L with YEtOH of 0.48 at 120 h and 19.3 g/L with YEtOH of 0.50 at 120 h, respectively.
수피 돈분 부산물 비료의 부숙단계별 분광학적 특성 변화
양재의(Jae E . Yang),박창진(Chang Jin Park),신명교(Myung Kyo Shin),박용하(Yong Ha Park),최문헌(Moon Heon Choi),김정규(Jeong Gyu Kim),김정제(Jeong Je Kim) 한국환경농학회 1999 한국환경농학회지 Vol.18 No.4
Changes of the spectroscopic characteristics of the organic matter fractions and circular filter paper chromatograph were assessed for the bark and piggery manure composts during the composting. as an approach to base the criteria of the compost maturity evaluation. Contents of humic acid-C (HA-C) and fulvic acid-C (FA-C) in both bark and piggery manure composts were decreased as the composting got closer to maturity, but the ratios of HA-C/FA-C were increased. During the composting. Δlog K values were decreased, but RF values were increased. Humic acid of the mature bark compost after 120 days of composting was A-type, as compared to Rp-type for the raw bark and B-type for the immature compost. However. humic acid of the mature piggery manure composts after 40 days of composting was B-type, indicating the humification of the organic matter fractions continued at this stage. Circular filter paper chromatograph of the mature bark compost exhibited the regular sawteeth pattern at the edge, but that of the mature piggery manure showed an irregular sawteeth pattern. Results demonstrated that spectroscopic characteristics and circular filter paper chromatograph of the organic by-product composts might be employed for the compost stability assessment.