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약산 전처리 조건에 따른 소경 신갈나무 유래 푸르푸랄 및 레불린산의 함량 변화
장수경 ( Soo Kyeong Jang ),정한섭 ( Han Seob Jeong ),홍창영 ( Chang Young Hong ),김호용 ( Ho Yong Kim ),류가희 ( Ga Hee Ryu ),여환명 ( Hwanmyeong Yeo ),최준원 ( Joon Won Choi ),최인규 ( In Gyu Choi ) 한국목재공학회 2015 목재공학 Vol.43 No.6
In this study, dilute acid pretreatment was operated using small-diameter Quercus mongolica for evaluating the yield change of furfural and levulinic acid depending on pretreatment factors. The dilute acid pretreatment was conducted depending on reaction temperature (140-180℃), reaction time (10-30 min), and sulfuric acid concentration (0-2%, w/w). Then, glucose, XMG (xylose + mannose + galactose), furfural, and levulinic acid contents in the liquid hydrolyzate were measured and analyzed after pretreatment. Glucose content increased to 16.02% as reaction temperature, reaction time, and sulfuric acid concentration increased, but it decreased at the sulfuric acid concentration of 2% (reaction temperature: > 170℃, reaction time: > 20 min). On the other hand, reaction temperature had a strong influenced on XMG content, and XMG content decreased to 1.63% through increasing of reaction temperature and sulfuric acid concentration, but XMG content was less affected by changes of reaction time. Furfural content increased with the increase of reaction temperature, reaction time, and sulfuric acid concentration, and maximum furfural content was 7.61% (reaction temperature: 180℃, reaction time: 20 min, sulfuric acid concentration: 1%) based on a weight of raw material, while furfural content was dropped in more severe condition than in maximum furfural content condition. Levulinic acid content also increased with higher reaction temperature, reaction time, and sulfuric acid concentration. Especially, the sharp increase of levulinic acid content was observed above 170℃, and maximum levulinic acid content was 10.98% (reaction temperature: 180℃, reaction time: 30 min, sulfuric acid concentration: 2%). However, less than 1% of furfural and levulinic acid content was obtained in non-acidic catalyst condition that in whole conditions of reaction temperature and reaction time.
부후된 굴참나무로부터 분리된 곰팡이의 균체 외 효소 활성 평가
나현정 ( Hyunjeong Na ),장수경 ( Soo-kyeong Jang ),박미진 ( Mi-jin Park ) 한국목재공학회 2022 한국목재공학회 학술발표논문집 Vol.2022 No.1
굴참나무(Quercus variabilis)는 우리나라에서 가장 많이 서식하는 활엽수 중 하나로서 코르크, 상업용 목탄을 만드는 데 주로 사용되며 농업, 자동차 산업, 장비 제작의 분야에 이용되는 등, 활용 가치가 높은 수종이다. 그러나 굴참나무가 속한 참나무류는 생장 중인 입목의 뿌리와 줄기 등에서 부후의 발생이 다른 수종에 비하여 높기 때문에 이로 인한 목재의 손실이 큰 것으로 알려져 있다. 또한, 목재가 부후되면 고유한 색이 변화하고 강도가 감소하기 때문에 이용 가치가 감소하여 결과적으로 경제적인 손실이 발생하게 된다. 따라서 본 연구에서는 목재 부후와 관련하여 대표적인 곰팡이 효소인 cellulase와 laccase의 활성 유무를 측정하고, 목재 자원으로서 굴참나무의 이용 가치를 저하시키는 부후에 관련된 균주의 정보를 구명하고자 하였다. 본 연구팀의 이전 실험을 바탕으로, 부후된 굴참나무로부터 분리된 곰팡이 63종을 streptomycin이 첨가된 potato dextrose agar에 계대 배양하여 본 연구에 사용하였다. Cellulase는 carboxymethylcellulose(CMC) sodium salt를 기질로 하여 효소 활성을 측정하였다. 제조한 CMC agar에 분리된 6 mm 직경의 접종원을 접종한 후 25℃ 배양기에서 빛을 차단하여 2일 동안 배양하였다. 그 후, 접종원을 중심으로 Gram’s iodine solution을 1 mL떨어뜨린 뒤 알루미늄 호일로 빛을 차단하여 2시간 동안 상온에서 반응시켜 접종원을 중심으로 형성되는 투명한 환의 직경을 측정하였다. 한편, laccase는 2,2’-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid)(ABTS) diammonium salt를 기질로 하여 효소 활성을 측정하였다. 제조한 ABTS agar에 분리된 6 mm 직경의 접종원을 접종한 후, 25℃ 배양기에서 5일 동안 빛을 차단하여 배양하였다. 배양 후에는 접종원을 중심으로 형성되는 청록색 환의 직경을 측정하였다. Cellulase와 laccase 활성 측정 결과, 총 63종의 곰팡이 중 54종의 곰팡이가 cellulase 활성을 보였으며 32종의 곰팡이가 laccase 활성을 나타냈다. 또한 31종의 곰팡이가 cellulase와 laccase 활성을 모두 나타내었으며 이전 실험에서 부후 여부에 따른 군집 분석의 결과 유의미한 변화를 나타내었던 담자균류는 8종이었다. 상기 연구 결과는 굴참나무 부후에 관련된 균주의 정보를 제시함으로써 굴참나무 부후 제어를 위한 감염 경로 및 기작과 관련한 추후 연구에 기여할 것으로 사료된다.
정한섭 ( Hanseob Jeong ),장수경 ( Soo-kyeong Jang ),김종화 ( Jong-hwa Kim ),최인규 ( In-gyu Choi ),안지은 ( Ji-eun An ),이수민 ( Soo Min Lee ) 한국목재공학회 2022 한국목재공학회 학술발표논문집 Vol.2022 No.1
본 연구에서는 목질계 바이오매스의 탈리그닌 전처리와 초임계수 가수분해를 통해서 상업용 당(sugar)을 생산하고자 하였다. 이를 위해 아염소산나트륨과 아세트산을 촉매로 이용하여 목질계 바이오 매스의 탈리그닌화를 진행하였고, 100℃ 이하에서 촉매 투입량, 바이오매스:용매 비율(고액비), 반응시간 등을 조절하여 실험하였다. 그 결과, 촉매 투입량이 증가함에 따라 전처리를 통한 바이오매스의 당과 리그닌의 분해율이 증가하였고 당은 최대 17%, 리그닌은 최대 20%까지 액상 내로 분해되었다. 바이오매스 대비 용매의 양이 증가할 경우는 1:13까지 바이오매스 구성성분에 대한 분해율이 증가하였고, 특히 리그닌은 최대 60%까지 제거하는 결과를 나타냈다. 한편 반응시간이 증가함에 따라서는 전처리 고형분내 각 성분의 함량이 소폭 감소하였고, 당 손실 대비 리그닌 제거율이 반응시간이 지남에 따라 향상됨을 확인하였다.
양지윤 ( Jiyoon Yang ),이수연 ( Su-yeon Lee ),박미진 ( Mi-jin Park ),장수경 ( Soo-kyeong Jang ),나현정 ( Hyunjeong Na ),윤정하 ( Jeongha Yoon ) 한국목재공학회 2022 한국목재공학회 학술발표논문집 Vol.2022 No.2
Citrus is one of the most popular and widely grown fruit crops in the world. To explore the bioactivity of citrus, this study investigated the effects of essential oils from citrus cultivars on melanogenesis. The essential oils were obtained by hydro-distillation, and the chemical composition was analyzed by gas chromatography-mass spectrometry. Limonene is a predominant constituent, and other components showed trace amounts. A polymerase chain reaction was used to determine the expression of melanogenesis-related mRNA (TRP-1, TRP-2, and tyrosinase). As a result, the gene expression levels associated melanogenic were remarkably inhibited by (Citrus unshiu X Citurs sinensis) X Citrus reticulata and Citrus reticulata. Overall, the essential oils of Citrus reticulata-based cultivars presented the best bioactivity. These results indicate that Citrus reticulata-based cultivars are potential candidates with anti-melanogenesis activity for cosmetics and medicine agents against skin hyperpigmentation.
Remazol Brilliant Blue R 탈색능과 리그닌 분해 효소시스템을 이용한 유기용매 리그닌 생분해 우수 균주 선별
홍창영 ( Chang Young Hong ),김호용 ( Ho Yong Kim ),장수경 ( Soo Kyeong Jang ),최인규 ( In Gyu Choi ) 한국목재공학회 2013 목재공학 Vol.41 No.1
In this study, outstanding white rot fungi for biodegradation of organosolv lignin were selected on the basis of their ligninolytic enzyme system. Fifteen white rot fungi were evaluated for their ability to decolorize Remazol Brilliant Blue R (RBBR) in SSC and MEB medium, respectively. Six white rot fungi (Ceriporiopsis subvermispora, Ceriporia lacerate, Fomitopsis insularis, Phanerochaete chrysosporium, Polyporus brumalis, and Stereum hirsutum) decolorized RBBR rapidly in SSC medium within 3 days. The protein contents as well as the activities of manganese peroxidase (MnP) and laccase for 6 selected fungi were determined on the SSC medium with and without organosolv lignin. Interestingly, extracellular protein concentrations were determined to relative higher for S. hirsutum and P. chrysosporium in the presence of organosolv lignin than others. On the other hands, each fungus showed a different ligninolytic enzyme pattern. Among them, F. insularis resulted the highest ligninolytic enzyme activities on incubation day 6, indicating of 1,545 U/mg of MnP activity and 1,259 U/mg of laccase activity. In conclusion, STH* and FOI were considered as outstanding fungi for biodegradation of organosolv lignin, because STH* showed high extracellular protein contents and ligninolytic enzyme activities over all, and ligninolytic enzyme activities of FOI were the highest among white rot fungi used in this study.
신갈나무 약산 전처리 공정 중 반응표면분석법을 이용한 액상 가수분해물의 furfural 수율 탐색
류가희 ( Ga Hee Ryu ),정한섭 ( Han Seob Jeong ),장수경 ( Soo Kyeong Jang ),홍창영 ( Chang Young Hong ),최준원 ( Joon Weon Choi ),최인규 ( In Gyu Choi ) 한국목재공학회 2016 목재공학 Vol.44 No.1
In this study, furfural, which is one of the value-added chemicals, was produced from the hydrolyzate of Quercus mongolica using dilute acid pretreatment, and the optimal pretreatment condition was determined by Response Surface Methodology (RSM) to obtain high yield of furfural. Based on Central Composite Design, the pretreatment experiment was designed with parameters such as reaction temperature (X1), acid concentration (X2), and reaction time (X3) as independent variables, while dependent variable was furfural concentration (Y), and furfural yield (Z) was shown as percentage of Y per a dry weight basis. According to results of RSM, it was confirmed that reaction temperature (X1) was the most influence factor and reaction temperature (X1)-acid concentration (X2) was the most significant interaction factor on furfural yield. Also, the optimal condition for the highest furfural yield was predicted at reaction temperature of 184℃, acid concentration of 1.17%, and reaction time of 5 min by RSM, and expected maximum yield of furfural was 6.37%. Experimentally, the maximum yield of furfural produced at above optimal condition was 6.21%, and it was considerably similar with the predicted value, and therefore the model for furfural production from the hydrolyzate of Quercus mongolica during dilute acid pretreatment could be built using RSM.