• 한국응용과학기술학회지
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• 제13권3호
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• pp.61-71
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• 1996

In acid-catalyzed acetal cyclization of long aliphatic aldehydes($R=n-C_7H_{15}$ ; $n-C_9H_{19}$ ; $n-C_{11}H_{23}$) with 1,1,1-tris(hydroxymethyl)propane, 2-alkyl-5-hydroxymethyl-5-ethyl-1,3-dioxanes were obtained. The final products, sodium 2-alkyl-5-(sulfonatedpropylethermethyl)-5-ethyl-1,3-propanesultion in the presence of sodium hydride. These compounds were a new group of destructible surfactants which were readily hydrolyzed and oxidized in natural water reservoirs. Physical properties of these new compounds involved some surface properties such as Krafft point(Kp), critical micelle concentration(cmc), surface tension of aqueous solutions near cmc(${\gamma}_{min}$), foaming power, emulsion power and hydrolysis properties were determined. The destructible surfactants containing 1,3-dioxane ring were synthesized to about $85{\pm}5.5%$ yield. The cmc values of the compounds by ring method were assumed to $0.5{\sim}5.0{\times}10^{-3}mol/L$ range and surface tensions at cmc were $29.5{\sim}33.0dyne/cm$ respectively at $25^{\circ}C$. The foaming power and foam stability were $170{\sim}230mm$ and $52{\sim}135mm$ respectively at $1{\times}10^{-2}mol/L$, foam was occurred rarely below $1{\times}10^{-3}mol/L$. The emulsion property of liquid paraffin was better than that of soybean oil. For hydrolysis property with ph and time, these compounds were decomposed within about 200minutes at $ph1{\sim}2$. Hopefully these compounds are expected to be a good O/W emulsifier that have decomposability in acid and may be used in the process which do not need foaming.

• Korean Chemical Engineering Research
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• 제46권3호
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• pp.535-539
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• 2008

폐EPS 열분해반응으로부터 원료인 스티렌모노머로 회수하는 열분해반응에서 오일의 생성 및 오일 중에 함유된 스티렌, 에틸벤젠, 알파메틸스티렌의 생성은 반응중에 생성되는 잔류물의 영향을 받으며 원하는 조건에서 반응의 진행이 어려우므로 반응중에 생성되는 잔류물의 영향을 받지않는 새로운 반응기를 개발하였다. 본 연구에서는 열분해 과정에서 주입되는 원료가 회분식반응기와 달리 반응 중 생성되는 잔류물의 영향을 받지 않고 일전한 온도가 유지되는 원료가 벽을 통해 흐르는 새로운 형태의 wetted-wall형 반응기를 사용하여 반응온도, 생성오일의 배출을 쉽게 하기 위해 주입되는 질소 유량 등의 변수들을 고찰하였다. 또한 반응으로부터 선정된 최적조건에서 반응기 설계를 위한 반응속도론적 연구를 수행하였다.

• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2005년도 생물공학의 동향(XVII)
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• pp.272-276
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• 2005

Candida tropicalis, an osmophilic strain isolated from honeycomb, produced xylitol at a maximal volumetric production rate of 3.5 g $l^{-1}$ $h^{-1}$ from an initial xylose concentration of 200 g $l^{-1}$. Even with a very high xylose concentration, e.g., 350 g $l^{-1}$, this strain produced xylitol at a moderate rate of 2.07 g $l^{-1}$ $h^{-1}$. In a fed-batch fermentation of xylose and glucose, 260 g $l^{-1}$ of xylose was added, and xylitol production was 234 g $l^{-1}$ for 48 h, corresponding to a rate of 4.88 g $l^{-1}$ $h^{-1}$. To increase the xylitol production rate, cells were recycled in a submerged membrane bioreactor with suction pressure and air sparging. In cell-recycle fermentation, the average concentration of xylitol produced per recycle round, total fermentation time, volumetric production rate, and product yield for ten rounds were 180 g $l^{-1}$, 195 h, 8.5 g $l^{-1}$ $h^{-1}$, and 85%, respectively. When cell-recycle fermentation was started with the cell mass contratrated two-fold after batch fermentation and was performed for ten recycle rounds, we achieved a very high production rate of 12 g $l^{-1}$ $h^{-1}$. The production rate and total amount of xylitol produced in cell-recycle fermentation were 3.4 and 11 times higher than in batch fermentation, respectively.

• 한국작물학회지
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• 제47권3호
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• pp.189-195
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• 2002

야생종의 콩나물 관련형질의 특성 및 주요성분을 재배종과 비교하여 야생종을 소립 나물콩 육성을 위한 교배친으로서의 이용 가능성을 검토하기 위해 실시한 결과를 요약하면 다음과 같다. 1. 야생종과 재배종의 콩나물 특성을 비교한 결과 하배축의 길이와 수량에는 차이가 없었으나, 콩나물의 전체길이, 하배축 두께, 개체당 무게, 상품률에서는 재배종이 우수하였고, 잔뿌리의 수와 뿌리의 길이에서는 야생종이 작고 짧아 야정종이 우수한 것으로 평가되었다. 2. 조지방 및 sucrose함량은 재배종이, 조단백질 함량은 야생종이 높았으며, 지방산중 oleic acid는 재배종이 linoleic acid는 야생종이 높았고, isoflavone함량에서는 두 종간 차이가 없었다. 17개의 아미노산 중 유의적인 차이가 인정된 aspartic acid, lysine, arginine등 10개 아미노산은 모두 야생종에서 높았다. 3. 콩나물 하배축의 색차는 야생종에서 백색도가 높고 적색도가 낮아 재배종보다는 야생종이 우수한 것으로 평가되었다.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.220-220
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• 2017

Soybean (Glycine max (L.) Merill) is a very outstanding material crop with high protein and oil contents. We conducted this study to evaluate forage value and usability of soybean varieties as livestock forage. Three soybeans cultivars, OT93-26, Geomjeongsaeol, and Pungwon, were evaluated for forage use in this study, and Kwangpyeongok and Yeongwoo were used as check forage corn and rice, respectively. The whole soybean plants were harvested at the R5 (beginning seed development)- and R6 (full seed)-reproductive stages for analyzing forage usability and quality. Days to harvesting of the R5 stage-OT93-26 was the shortest among the tested crops while that of Yeongwoo was 122 days. The fresh and dry matter yields of all 3 soybeans were greater at R6 stage than at R5. Crude protein of the soybean cultivars harvested had a higher compared to the rice and corn regardless of the harvesting stage. Contents of crude fiber, neutral detergent fiber and acid detergent fiber of Yeongwoo had the lowest whereas Pungwon harvested at R5 were the highest. Among the soybeans, digestible dry matter, dry matter intake, and relative feed value of R6-harvested Geomjeongsaeol and Pungwon were high more compared to those at the R5-harvested, but in case of OT93-26 those at R6 stage were inversely measured rather than those at R5 stage. In conclusion, soybean can be used as s forage with high nutritive value for livestock. Moreover, Geomjeongsaeol can be applied to develop new forage soybean varieties with high nutritive value, and R6 stage is the optimum harvesting stage in yield and quality of the tested soybeans more than R5.

• 한국환경농학회지
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• 제22권4호
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• pp.273-277
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• 2003

본 시험은 환경농업기술을 직접 농가에 파급시킬 목적으로 3년간($'96{\sim}'98$)수행하였던 연구결과를 토대로 1999년에 환경농업 시범마을인 남원시 대강면 방산리의 일반농가포장에서 수행한 결과이다. 계분 발효퇴비와 깻묵을 시용한 환경농업과 절충형농업 시험구의 벼 생육은 화학비료를 시용한 일반관행농업 시험구에 비하여 저조하였으며, 왕우렁이(Ampullarius insularus)를 이용한 잡초방제 효과는 제초제 2회(초 중기) 살포 효과보다 우수하였다. 목초액의 병해충 방제효과는 저조하였고, 또한 환경농업과 절충형농업 시험구의 정조수량은 일반관행농업 시험구에 비하여 $3{\sim}5%$ 감소 되였다. 수질은 환경농업과 절충형농업 시험구가 일반관행농업 시험구에 비하여 COD, $NO_3-N$, $SO_4^{2-}$, $Cl^-$등이 낮았으며, 물벼룩의 밀도는 높았다.

• 한국축산식품학회지
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• 제40권2호
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• pp.209-220
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• 2020

Milk fat globule membrane (MFGM) is a lipid carrier in mammals including humans that consists mainly of polar lipids, like phospholipids and glycolipids. In this study, a process to enrich polar lipids in commercial butter and whey powder, including polar lipids of MFGM, was developed. WPC (whey protein concentrate) 60 was selected as the most suitable raw material based on the yield, phospholipid, protein, and lactose content of the polar lipid fraction obtained by ethanol extraction of two WPC (WPC60 and WPC70) and two buttermilk (A and B). After fractionation under optimum conditions, the polar-lipid enriched fraction from WPC60 contained 38.56% phospholipids. The content of glycolipids, cerebroside, lactosylceramide, ganglioside GM3, ganglioside GD3, was 0.97%, 0.55%, 0.09%, and 0.14%, respectively. Rancimat results showed that the oxidation stability of fish oil increased with an increase in the polar-lipid fraction by more than 30 times. In addition, the secretion of IL-6 and TNF-α decreased in a concentration-dependent manner after treatment of RAW 264.7 cells with 0.1 to 100 ppm of the polar lipid fraction. In this study, polar lipid concentrates with antioxidant and anti-inflammatory activity, were prepared from milk processing by-products. The MFGM polar lipid concentrates made from by-products are not only additives for infants, but are also likely to be used as antioxidants in cooking oils and as active ingredients for functional foods.

• Advances in environmental research
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• 제2권1호
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• pp.19-33
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• 2013

Microalgae are receiving an increasing attention because of their potential use as $CO_2$ capture method and/or as feedstock for biofuels production. On the other hand the current microalgae-based technology is still not widespread since it is characterized by technical and economic constraints that hinder its full scale-up. In such contest the growth kinetics of Nannochloris eucaryotum (a relatively unknown marine strain) in batch and semi-batch photobioreactors is quantitatively investigated with the aim of obtaining the corresponding kinetic parameters suitable for process engineering and its optimization. In particular the maximum growth rate was evaluated to be 1.99 $10^{-3}\;h^{-1}$. Half saturation concentrations for nitrates ($K_N$) and phosphates uptake ($K_P$) were evaluated as 5.4 $10^{-4}\;g_N\;L^{-1}$ and 2.5 $10^{-5}\;g_P\;L^{-1}$, respectively. Yield factors for nitrogen ($Y_N$) and phosphorus ($Y_P$) resulted to be 5.9 $10^{-2}\;g_N\;g^{-1}$ biomass and 6.0 $10^{-3}\;g_P\;g^{-1}{_{biomass}}$, respectively. The possibility of using 100% (v/v) $CO_2$ gas as carbon source is also evaluated for the first time in the literature as far as N. eucaryotum is concerned. The strain showed a good adaptability to high concentrations of dissolved $CO_2$ as well as to low pH. The lipid content under 100% $CO_2$ is about 16.16 %wt $wt^{-1}$ and the fatty acid methyl esters composition of the extracted oil is in compliance with the European regulation for quality biodiesel.

• 한국버섯학회지
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• 제15권1호
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• pp.57-60
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• 2017

큰느타리에 대한 국내산 자포니카타입의 벼에서 부산물로 나오는 미강을 대체할 수 있는 재료를 선발하기 위해 파키스탄에서 생산된 인디카 타입의 벼에서 생산된 미강과 옥수수주정박, 호마박, 케이폭박을 이용하여 시험한 결과 다음과 같다. 혼합배지별 이화학성 중 총탄소함량은 T1에서 가장 높았고, 총질소함량은 T4에서 가장 높았다. C/N은 T2가 대조구와 대등하였고, 갓직경과 대길이는 T1과 T2에서 컸다. 수량 및 생물학적 효율은 T2에서 다른 처리구 보다 높았으며, 대조구와 대등한 값을 나타내었다. 따라서 미강팰릿을 큰느타리 병재배에 첨가하여 사용할 수 있을 것으로 판단되었다.

• 한국수산과학회지
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• 제53권5호
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• pp.707-716
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• 2020

Red sea cucumber Stichopus japonicus, was dried using three methods-far-infrared ray, vacuum, and freeze drying and then enzymatically hydrolyzed using nine proteases: Alcalase, Flavourzyme, Kojizyme, Neutrase, Protamex, trypsin, α-chymotrypsin, and papain. In addition, the potential ability of hydrolysates to inhibit lipid accumulation in 3T3-L1 adipocytes was evaluated. The yield of hydrolysates from red sea cucumbers dried using each method was higher than that of the distilled water extract, and protein contents were either similar or higher. The hydrolysates that exhibited inhibitory effects on lipid accumulation, as demonstrated via Oil red O staining, were those obtained by far-infrared ray drying coupled with Alcalase, Flavourzyme, Kojizyme, or Neutrase treatment. In addition to the advantages of far-infrared drying and the characteristics of Flavourzyme, the Flavourzyme hydrolysate of far-infrared-dried red sea cucumber showed the highest inhibitory effect on lipid accumulation. In addition, this hydrolysate significantly decreased the expression of the protein factor fatty acid-binding protein 4, which is related to the late differentiation of 3T3-L1 adipocytes. Taken together, these results suggest that Flavourzyme hydrolysates from farinfrared-dried red sea cucumber may be used as a functional food and/or a pharmaceutical ingredient for the inhibition of lipid accumulation.