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Bioethanol production by enzymatic saccharification of Salix viminalis var. gigantea biomass
김학곤,최명석,송현진,정미진,서영롱,양재경,유석봉 한국산림과학회 2014 Forest Science And Technology Vol.10 No.2
The biomass of Salix viminalis var. gigantea was evaluated for the possibility of using it as a bioenergy resource. Thechemical analysis of S. viminalis var. gigantea leaf biomass showed presence of components such as extractives (1.6%),lignin (44.2%), hemicellulose (16.4%), and cellulose (37.8%), whereas its stem was composed of other extractives (0.6%),lignin (19.4%), hemicellulose (35.1%), and cellulose (44.9%). Leaf and stem biomass samples of S. viminalis var. giganteawere hydrolyzed using two commercial enzymes, celluclast and viscozyme. The hydrolysis of S. viminalis var. giganteabiomass was different according to enzyme mixtures and their strengths. The optimal enzyme combination was found to becelluclast (59 FPU g1 substrate) and viscozyme (24 FBG g1 substrate). Glucose content in leaf and stem biomass was16.81 g and 27.45 g per 100 g raw material, respectively, after 72 hr of enzyme treatment. The ethanol production fromstem and leaf biomass was estimated as 4.45 g and 7.94 g, respectively. The biomass and enzyme hydrolysis biomass servedas feedstock for ethanol production by fermentation.
김학곤,용성현,김도현,박관빈,차승아,이지현,김선아,양재경,최명석 경상국립대학교 농업생명과학연구원 2024 농업생명과학연구 Vol.58 No.1
The chemical composition of 86 species of native plants in Korea, including plants to be afforestation, was analyzed. The chemicalcomposition of the species analyzed was different. The species with the highest extractable content was Viburnum dilatatum (3.91%),and the species with the lowest extractable content was Ligustrum lucidum (0.11%). The lignin content ranged from 12 to 39%, withan average of 25%. The species with the highest lignin content was Chaenomeles lagenaria (39.37%). Hemicellulose content rangedfrom 18 to 52%, with the highest species being Thuja occidentalis (51.22%) and Eucommia ulmoides (48.84%). Cellulose content rangedfrom 25 to 58%, and the species with the highest content were Prunus serrulata (57.67%), Diospyros kaki (57.14%), Aesculus turbinata(53.29%), Albizia julibrissin (53.02%), and Zelkova serrata (52.29%). The chemical composition was different for each use taxon of86 plant species. The lignin content was the highest in the fruit group and the lowest in the group other than recommended speciesfor afforestation. Cellulose content was highest in non-reforestation-recommended tree species and lowest in fruit trees. In classificationaccording to tree height, lignin content was higher in shrubs than in tall trees, and cellulose content was highest in tall trees. Betweendeciduous and evergreen trees, the lignin content was high in deciduous trees (26.46%), and the cellulose content was also high indeciduous trees (44.01%). As a result of analyzing the correlation between each compound, there was a difference. There tended tobe a positive correlation between extractives and lignin content. There was a negative correlation between extractives and holocellulosecontent, hemicellulose and cellulose. The higher extract content affected the cellulose content much more than hemicellulose. Also, thehigher the lignin content, the lower the cellulose content. The species with low lignin content and high cellulose content were Diospyroskaki and Prunus serrulata var. spontanea. This result is expected to be primary data for bioenergy, pulp industry and bioindustry.
김학곤,강승미,용성현,설유원,최은지,박준호,유찬열,Tamirat Solomon,최명석 한국약용작물학회 2020 한국약용작물학회지 Vol.28 No.1
Background: Although Sancho (Zanthoxylum schinifolium Siebold & Zucc) oil has traditionally been used for its antibiotics properties, there is currently a lack of scientific evidence regarding its biological activities. In this study, we investigated the antimicrobial and antioxidant activities of Sancho oil against food-hazardous microorganisms, phytopathogens, and dermatophytes. Methods and Results: We investiated the antimicrobial activity of Sancho oil against 11 food-hazardous microorganisms, nine phytopathogens, and six dermatophytes. The Sancho oil was found to show the strongest antibacterial activity against Shigella flexneri and Listeria spp. Sancho oil also showed high antifungal activity against plant pathogens, particularly Fusarium oxysporum, and showed antimicrobial activity against dermatophytes such as Trichophyton rubrum, Microsporum canis and Candida albicans. The antioxidant activity of Sancho oil was measured using the DPPH method, and was found to be stronger than that of unrefined oil. Moreover, this activity increased with increasing oil concentration. Conclusions: We found that Sancho oil showed differing antimicrobial activities against food-hazardous microorganisms, dermatophytes, and plant pathogens. The antimicrobial activity spectrum of Sancho oil was not broad and varied among microbial strains. On the basis of our findings, we consider that Sancho oil could be used an antibacterial material for food-borne S. flexneri and Listeria spp., a biopesticide for Fusarium spp., and a treatment for dermatophytes such as T. rubrum.
김학곤,강승미,박동진,용성현,양우형,박준호,유찬열,타미랏 솔로몬,최명석 한국약용작물학회 2018 한국약용작물학회지 Vol.26 No.6
Background: Sancho (Zanthoxylum schinifolium Siebold and Zucc) oil is used as a traditional medicinal material to treat severs stomach inflammation and as a diuretic. This study was carried out to investigate the effect of addition of antioxidants and blended oil the storage stability and safety of the biomaterial. Methods and Results: The effects of temperature and light on sancho oil were investigated, and the ability of antioxidants in preventing rancidity of the oil was discovered. Under fluorescent light and in darkness, the acidity of the oil was much lower than that under direct sunlight. The addition of antioxidants decreased the acid value of sancho oil; the antioxidant that showed the best results in this regard was 0.5% propolis. The acid value of canola oil, which had the lowest acid value compared with that of other oils, and blended oil, containing 5% canola oil in sancho oil, decreased by 5.5% and 15%, respectively. About one acid value decrease was observed for every 1% increase in blending with canola oil. As the concentration of canola oil increased, the viscosity and the elightness (L valu) of sancho oil increased slightly, while the blueness (b value) decreased. Conclusions: The results of this study may contribute to ensuring food safety during preservation and the industrialization of the presevation of sancho oil.
산초 종자로부터 추출된 산초 오일의 물리화학적 조성과 특성
김학곤,강승미,용성현,김도현,박관빈,최명석 한국약용작물학회 2022 한국약용작물학회지 Vol.30 No.1
Background: The seed oil of Zanthoxylum schinifolium S. et Z. (sancho) is a traditional vegetable oil that is usually sold at high prices. However, there is no information on the characteristics of sancho oil according to the collection site in Korea. Therefore, this study investigated characteristics such as the fatty acid composition, acid value, peroxide value, color, consistency, volatile compound composition, and antioxidant activity of sancho oil from different sites. Methods and Results: Sancho seeds were collected from four sites (Hadong, Gapyeong, Jinan, and Yeongwol), that produce sancho oil, which was extracted by pressing. The content of major fatty acids, acid value, peroxidation degree, color and antioxidant activity were significantly different between the by collection sites. However, there was no significant difference in viscosity. Conclusions: The fatty acid content of sancho oil varied according to the collection site, and properties such as acid value and antioxidant activity were different. Therefore, it is necessary to standardize the production and distribution of sancho oil produced in Korea, and studies to identify high-yielding varieties are important.