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Alkaline Deacetylation for Cellulosic Ethanol Production Using Potential Energy Crops
Yebin JU,Soo Rin KIM 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
Hemp (Cannabis sativa) and Kenaf (Hibiscus cannabinus) are similar in appearance, but hemp belonging to the genus Cannabis is grass-like, and kenaf belonging to the genus Hibiscus is hard like wood. Meanwhile, cellulosic hydrolysates with lignin structure contain specific and considerable amount of acetic acid. Acetic acid inhibits yeast fermentation, causing cytosolic oxidation and stresses. Therefore, optimizing cellulosic treatment process is necessary for a specific type of biomass considering acetic acid concentration. In present study, ethanol production yield was improved by performing deacetylation pretreatment in which only acetic acid was selectively removed by mild-alkaline before acid pretreatment. In addition, optimal condition was confirmed to minimize the loss of fermentable sugar. Finally, compositional analysis of the biomass and removal amount of acetic acid were comparatively analyzed. These results indicate that ethanol yield and productivity can be improved by removing acetic acid from hydrolysates through deacetylation process and suggest that acetic acid bypass strategy is absolutely necessary to efficiently utilize cellulosic biomass as a bio-based energy source.
Bioconversion of Marin Wastes into Bioplastic Monomers
Jamin SHIN,Jueun JANG,Yebin JU,You-Kyung LEE,Jeongman SEOL,Soo Rin KIM 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
Sargassum horneri is inedible and invasive species of brown macroalgae that expands and drifts in Spring and Summer, causing damages to the ecosystem of the south coast of Korea, especially Jeju island. The Korean government is preventively eliminating a large amounts of S. horneri biomass before reaching to the coast and treating it in landfills or incineration, but this causes another environmental problem. In the present study, S. honeri biomass was tested as a raw material for the biological production of lactic acid used in various fields such as food additives, cosmetic and chemical industry. Simultaneous saccharification and fermentation (SSF) with lactic acid-producing engineered yeast was optimized in various conditions including type of commercial cellulases, solid loading, and scale-up fermentation. Finally, lactic acid was produced at a yield of 0.24 g lactic acid/g dried biomass and productivity of 0.73 g lactic acid/L-h, suggesting an industrial potential to biologically utilize S. honeri coastal waste.
괭생이모자반의 동시당화발효를 통한 Lactic Acid의 생산
장주은(Jueun Jang),주예빈(Yebin Ju),이유경(You-Kyung Lee),설정만(Jeongman Seol),김수린(Soo Rin Kim) 한국생물공학회 2021 KSBB Journal Vol.36 No.2
Sargassum horneri is inedible and invasive species of brown macroalgae that expands and drifts in Spring and Summer, causing damages to the ecosystem of the south coast of Korea, especially Jeju island. Korean government is preventively collecting large amounts of S. horneri biomass before reaching to the coast, but there is no other way to dispose or utilize the biomass but landfill and incineration. In the present study, S. honeri biomass was tested as a raw material for biological production of lactic acid, a type of commodity chemicals for polymer synthesis. Using commercial cellulases and lactic acid-producing engineered yeast, simultaneous saccharification and fermentation (SSF) conditions were optimized and lactic acid production was demonstrated. Finally, lactic acid was produced at a yield of 0.24 g lactic acid/g dried biomass and at a productivity of 0.73 g lactic acid/L-h, suggesting an industrial potential to biologically utilize S. honeri coastal waste.
L-lactic Acid Production Using Adaptively Evolved Saccharomyces cerevisiae
Byeong-Kwan JANG,Deokyeol JEONG,YeBin JU,Soo Rin KIM 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
Lactic acid (LA) is one of the organic acids applied in various industries such as food additives, cosmetics, medical use, packaging, and pharmaceuticals. For this reason, the demand for LA is rapidly increasing in worldwide. Lactic acid bacteria is used as LA producing microbes but ironically it doesn’t tolerate high concentration of LA. But Saccharomyces cerevisiae yeast has high acid tolerance and its genetic engineering is not difficult. Therefore, S. cerevisiae already used as a platform to produce various valuable chemicals. In our previous study, we developed yeast strain that can produce LA (SR8LDH). In this study, the SR8LDH was adaptively evolved in 8% of LA condition and evolved strain was isolated (BK01). The BK01 strain was able to survive even at 8% LA condition or more. LA production of BK01 was up to 119 g/L and pH was even under 3 at that fermentation. In fermentation of lignocellulosic biomass, BK01 not only produced 12.5 g/L of LA, but also showed tolerance to 4 g/L of acetic acid, one of the fermentation inhibitors of lignocellulosic biomass. This suggests that BK01 could be presented as novel industrial LA producing yeast strains.
Park, Youngrong,Ryu, Yeon-Mi,Jung, Yebin,Wang, Taejun,Baek, Yeonggyeong,Yoon, Yeoreum,Bae, Sang Mun,Park, Joonhyuck,Hwang, Sekyu,Kim, Jaeil,Do, Eun-Ju,Kim, Sang-Yeob,Chung, Euiheon,Kim, Ki Hean,Kim, S American Chemical Society 2014 ACS NANO Vol.8 No.9
<P>The detection of colon cancer using endoscopy is widely used, but the interpretation of the diagnosis is based on the clinician’s naked eye. This is subjective and can lead to false detection. Here we developed a rapid and accurate molecular fluorescence imaging technique using antibody-coated quantum dots (Ab–QDs) sprayed and washed simultaneously on colon tumor tissues inside live animals, subsequently excited and imaged by endoscopy. QDs were conjugated to matrix metalloproteinases (MMP) 9, MMP 14, or carcinoembryonic antigen (CEA) Abs with zwitterionic surface coating to reduce nonspecific bindings. The Ab–QD probes can diagnose tumors on sectioned mouse tissues, fresh mouse colons stained <I>ex vivo</I> and also <I>in vivo</I> as well as fresh human colon adenoma tissues in 30 min and can be imaged with a depth of 100 μm. The probes successfully detected not only cancers that are readily discernible by bare eyes but also hyperplasia and adenoma regions. Sum and cross signal operations provided postprocessed images that can show complementary information or regions of high priority. This multiplexed quantum dot, spray-and-wash, and endoscopy approach provides a significant advantage for detecting small or flat tumors that may be missed by conventional endoscopic examinations and bestows a strategy for the improvement of cancer diagnosis.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2014/ancac3.2014.8.issue-9/nn5009269/production/images/medium/nn-2014-009269_0012.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn5009269'>ACS Electronic Supporting Info</A></P>
신준혁(Junehyunk Shin),강찬민(Chanmin Kang),김예빈(Yebin Kim),손명지(Myeongji Son),주민영(Minyeong Ju),이상운(Sangun Lee) 한국방송·미디어공학회 2020 한국방송공학회 학술발표대회 논문집 Vol.2020 No.11
시대가 변화됨에 따라 다양한 비대면 방송들이 증가하는 추세를 보이고 있다. 가상현실(VR)을 이용한 쇼케이스부터 실시간 쌍방향 소통을 활용한 무대까지 멀티뷰를 활용한 방송들이 여러 방향으로 활용되고 있으며. 이러한 환경 속에 관객과 조금 더 밀접한 방송을 진행하기 위한 여러 방법이 시도되고 있다. 따라서, 본 논문에서는 현장에서 녹화되고 있는 모든 카메라 소스들을 썸네일 사이즈로 만들어 한눈에 알아볼 수 있는 플랫폼을 구성하여 시청자가 원하는 카메라를 선택해 보고 싶은 장면을 선택할 수 있는 시스템을 제안한다.