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신희용,류재훈,이윤주,권우택,김영희,김수룡,배성렬 한국응용과학기술학회 2013 한국응용과학기술학회지 Vol.30 No.1
A new process for the synthesis of polyphenylcarbosilane (PPCS) via thermal rearrangement of polymethylphenylsilane (PMPS) in supercritical cyclohexane was proposed and investigated at reaction temperatures of 380-420℃, reaction times of 1-2 h, and a pressure of 15 MPa. The structure, molecular weight, and molecular weight distribution of the product were characterized by FT-IR, Si-NMR, and GPC. The ceramic yield was also measured by TGA analysis. High-quality PPCS with high molecular weight and ceramic yield can be synthesized via a supercritical process. Furthermore, this process, when compared to the conventional method, tends to moderate the reaction conditions such as reaction temperature and time. It is concluded that thermal rearrangement in supercritical fluid is an efficient and viable process in terms of the resulting yield, efficiency, and reaction time compared with those of the conventional PCS production process.
사불화 규소를 이용한 나노세공 실리카 개발 및 초임계건조법에 의한 실리카 에어로겔 제조
신희용,양영수,곽현,김종길,김호건,배성렬 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.2
비료제조 공정에서 발생되는 부산물인 규불산과 규산나트륨을 출발 물질로 하여 졸-겔법을 이용한 무기정량 연속반응에 의해 실리카 모노머인 Si(OH)4를 생성시키고 성장응집에 의해 hydrogel을 제조한 후 여러 공정 제어 조건을 통한 하이드로겔 내부 물성을 제어할 수 있는 최적 조건 및 물성 제어 기술을 개발하였으며, 제조된 하이드로겔을 초임계건조법을 이용하여 aerogel 제조기술개발 연구를 수행하였다. 초임계건조시 실리카겔의 표면적, 기공용적, 기공크기, 수축률 등을 제어하기 위하여 반응변수인 온도, 압력, 시간, 유속을 제어하여 반응조건을 최적화시켰다. 제조된 실리카 하이드로겔과 에어로겔의 물성을 측정하고 비교하였다.
신희용,심상혁,류영진,양지현,임상민,이철균 한국생물공학회 2018 Biotechnology and Bioprocess Engineering Vol.23 No.1
Lipid extraction is a critical step in the downstream processing of biodiesel production from microalgae. Solvent extraction using mixtures of non-polar and polar solvents is one of the most well-known processes for this purpose. Hexane is the most common solvent of choice for large-scale lipid extractions due to its technical and economic advantages, especially its high selectivity toward lipids and low cost. In this study, extractions using mixtures of hexane and polar solvents were evaluated for their performance in order to develop a more efficient method for large-scale lipid extraction from microalgae. The combination of hexane and methanol resulted in the highest fatty acid methyl ester (FAME) yield for lipids from Tetraselmis sp. The effects of extraction conditions, including proportions of methanol to hexane, ratios of total solvent volume to dry biomass, and extraction time, on extraction yields were evaluated to determine optimum conditions providing higher lipid and FAME yields. The optimal conditions were as follows: proportion of hexane to methanol of 1:1, ratio of total solvent volume to dry biomass of 10 mL/g, and extraction time of 120 min. Finally, the selected solvent mixture and optimal conditions were applied to larger scale extraction experiments with scale-up factors of 10, 50, and 100. FAME yields of large-scale extractions were almost completely consistent with increasing scale-up factors. The results of this study suggest that a hexane and methanol mixture is a promising solvent for large-scale lipid extraction from microalgae.
Dactinomycin이 Mouse십이지장 점막의 Alkaline Phosphatase활성에 미치는 영향
신희용,백두진,정호삼,이규식 한양대학교 의과대학 1988 한양의대 학술지 Vol.8 No.1
Dactinomycin, isolated from the culture broth of Strepeomyces chrysomallus or Streptomyces antibioticus, is one of the effective antibiotic anticancer drug. Since the flat portion of the molecule intercalates into the double helical DNA strands between successive guanine-cytocine base pair, it inhibits the action of DNA dependent RNA polymerase altering the biosynthesis of RNA and protions, Although dactinomycin is very effective against tumor cell proliferation, it may also damage on the normally proliferative tissues of the body and develope the toxic effects during treatment of cancer partients. The author has investigated the effect of dactionomycin on the mose duodenum histochemically observing changes in the activities of alkaline phosphatase. The animals treatedwith 1 mg per kg of dactinomycin were sacrificed at 12, 24 and 48 hours after drug administration and fasted for 12 hours before sacrificing animals of control and experimental groups. The animals of control group were administered only water for injection. The duodenum specimens were fixed in 10%-neutral formalin at 4℃ and sectioned in 16μm thickness in frozen cryostat. The acitivity of alkaline phosphatase was evaluated histochemically by Gomori's method and incubation time of sliced specimen was 20 minutes. The results were as follows. 1. The activities of alkaline phosphatase were moderately positive in the epithelium of duodenum of the control group, weakly positive in the 12 hours dactinomycin treated group strongly positive in the 24 hours dactinomycin treated group. The weakely positive reaction of alkaline phosphatase in the lamine propria, trace positive reaction in the submucosa and trace positive or negative reaction in the muscle layer were observed in the control group and all dactinomycin treated goup. Consequently, it is suggested that dactinomycin decreases activities of alkaline phosphatase in the epithelium of the duodenum in mouse.
신희용 ( Hee Yong Shin ),윤혜현 ( Hye Hyun Yoon ) 한국식품조리과학회(구 한국조리과학회) 2020 한국식품조리과학회지 Vol.36 No.6
Purpose: This study investigated the quality characteristics of Sablé cookies baked using various sugar substitutes. Methods: Sablé cookie samples were prepared by replacing 70% of the sugar with various sugar substitutes, viz., sucrose(CON), trehalose (TC), palatinose (PC), erythritol (EC), maltitol (MC), and D-xylose (XC). We then determined the quality characteristics of cookies by evaluating the moisture content, sugar content, color value, texture analysis, and assessing attribute difference test by 25 trained panels, and the acceptance test by 50 consumers. Results: The sugar content of the cookies was the highest in CON and the lowest in EC (p<0.001). Moisture content was the highest in XC and lowest in MC (p<0.001), whereas hardness was highest in MC and lowest in XC. In addition, XC had the lowest L value and the highest a and b values, indicating the darkest color among cookie samples (p<0.001). Attribute difference test revealed the highest savory odor in PC, and sweetest taste in CON and MC. Hardness, crispness and crumbliness were similar for CON and MC (p<0.05). The after-taste, tub-tub and nasty smell were highest in XC (p<0.001). Consumer acceptance was the highest for CON and MC, and the lowest for XC in odor, taste, texture, and overall preference (p<0.001). Conclusion: These results show the possibility that Sablé cookies baked with maltitol instead of sugar are suitable in improving the quality of cookies as well as consumer acceptance.