• Korean Journal of Agricultural Science
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• 제10권1호
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• pp.135-145
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• 1983

This study was conducted to obtain the fundamental data for the processing of carrot juices and know the effects of blanching conditions, acid and alkali treatments and sterilization on the quality factors of carrot juices. The result obtained was as follows. 1. Blanching condition, $100^{\circ}C$, 5min. was the most effective for the Brix, amino-N content, suspended solid, light transmittance and yield of carrot juices among $90^{\circ}C$, 15min., $95^{\circ}C$, 10 min., and $100^{\circ}C$, 5min. 2. 0.05N-acetic acid solution was the most effective blanching solution for the suspended solid, light transmittance, viscosity and yield of the juices compared to 0.05N-citric acid and 0.03N-hydrochloric acid solution. 3. The color changes during the processing of carrot juices caused by blanching process rather than sterilization process. 4. The ${\beta}$-carotene in carrot juices was very stable and about 80 % of it was remained in the carrot juice which had been blanched, extracted and sterilized at $115^{\circ}C$ for 30min. 5. Alkali treatment for the juice from acid - blanched carrots formed discoloration after sterilization. 6. Relative content (%) of sugars in raw carrot juice we re ribose, 8.51%; fructose. 10.15%; glucose, 12.25%; sucrose, 49.53% and oligosaccharide, 19.56%. When the carrots were blanched in boiling water, the contents of monosaccharide and disaccharide decreased slightly but that of oligosaccharide increased slightly, however, when the carrots were blanched in acid solution, and then neutralized and sterilized, relative contents of ribose and sucrose decreased remarkably but that of oligosaccharide increased considerably and those of glucose and fructose increased slightly. 7. Nineteen sorts of free amino acid were detected from the carrot juices and the mains of them were threonine+asparagine, alanine, serine+glutamine, aspartic acid, arginine, and glutamic acid.

• Proceedings of the Korea Concrete Institute Conference
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• 한국콘크리트학회 2001년도 가을 학술발표회 논문집
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• pp.1029-1034
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• 2001

The purpose of this research is to develop rapid setting cement latex modified concrete (RSLMC) which will be used to overlay bridge deck for maintaining and repairing. The main experimental variables were the types of rapid setting cement and variation of latex and antifoam agent contents were selected as admixture factor, then the properties of workability and strength development and durability properties were investigated. The results of this study show that latex content give increment of a slump due to surface tension in polymer particles and reduce unit weight of water for preservation of workability. In addition, When no and 1.6~3.2% antifoam agent were mixed, 8%, 2.0~3.8% were respectively obtained. An increasing the amount of latex produced concrete with increased flexural strength, but with slightly lower compressive strength. Rapid chloride permeability and freezing-thawing test carried out. As a results, according to increment of containing ratio antifoamer, strength of RSLMC increase, permeability showed lower value than ignorable 100 coulombs. Also, in the case of more than antifoamer 1.6%, the relativity dynamic modulus is mantained more than 90%, but in case of 0, 5%, it decrease. In consequence, with the view of strength and workability of RSLMC, it is considered that appropriate content ratio of antifoam agent and latex solid are respectively 1.6% by latex weight, 15% by cement weight.

• Environmental Engineering Research
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• 제22권3호
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• pp.277-280
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• 2017

Destablization and demulsification is a difficult task for the treatment of waste oil-in-water drilling fluid because of its "three-high" characteristics: emulsification, stabilization and oiliness. At present, China is short for effective treating technology, which restricts cleaner production in oilfield. This paper focused on technical difficulties of waste oil-in-water drilling fluid treatment in JiDong oilfield of China, adopting physical-chemical collaboration demulsification technology to deal with waste oil-in-water drilling fluid. After oil-water-solid three-phase separation, the oil recovery rate is up to 90% and the recycled oil can be reused for preparation of new drilling fluid. Meanwhile, harmless treatment of wastewater and sludge from waste oil-in-water drilling fluid after oil recycling was studied. The results showed that wastewater after treated was clean, contents of chemical oxygen demand and oil decreased from 993 mg/L and 21,800 mg/L to 89 mg/L and 3.6 mg/L respectively, which can meet the requirements of grade one of "The National Integrated Wastewater Discharge Standard" (GB8978); The pollutants in the sludge after harmless treatment are decreased below the national standard, which achieved the goal of resource recovery and harmless treatment on waste oil-in-water drilling fluid.

• KSBB Journal
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• 제28권6호
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• pp.366-371
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• 2013

Ethanol productions were performed by separate hydrolysis and fermentation (SHF) and simultaneous saccharification and fermentation (SSF) processes using seaweed, Enteromorpha intestinalis (sea lettuce). Pretreatment conditions were optimized by the performing thermal acid hydrolysis and enzymatic hydrolysis for the increase of ethanol yield. The pretreatment by thermal acid hydrolysis was carried out with different sulfuric acid concentrations in the range of 25 mM to 75 mM $H_2SO_4$, pretreatment time from 30 to 90 minutes and solid contents of seaweed powder in the range of 10~16% (w/v). Optimal pretreatment conditions were determined as 75 mM $H_2SO_4$ and 13% (w/v) slurry at $121^{\circ}C$ for 60 min. For the further saccharification, enzymatic hydrolysis was performed by the addition of commercial enzymes, Celluclast 1.5 L and Viscozyme L, after the neutralization. A maximum reducing sugar concentration of 40.4 g/L was obtained with 73% of theoretical yield from total carbohydrate. The ethanol concentration of 8.6 g/L of SHF process and 7.6 g/L of SSF process were obtained by the yeast, Saccharomyces cerevisiae KCTC 1126, with the inoculation cell density of 0.2 g dcw/L.

• Mycobiology
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• 제41권4호
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• pp.210-213
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• 2013

The objectives of this study were to evaluate applicability of food waste compost (FWC) as a substrate for cultivation of Ganoderma lucidum, Lentinula edodes, and Pholiota adipose, and to determine contents of Ca, Mg, Na, and K in fruiting bodies (FB). FB yield per substrate in FWC-free controls was $53{\pm}4g/kg$ for G. lucidum, $270{\pm}90g/kg$ for L. edodes, and $1,430{\pm}355g/kg$ for P. adipose. Substrates supplemented with FWC showed the highest FB production at FWC content of 10% for G. lucidum ($64{\pm}6g/kg$), and 13% for L. edodes ($665{\pm}110g/kg$) and P. adipose ($2,345{\pm}395g/kg$), which were 1.2~2.5 times higher than the values for the controls. P. adipose contained higher amounts of mineral elements than the other species. Ca, Mg, Na, and K content in FB did not show a significant relation to FWC content.

• Natural Product Sciences
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• 제29권2호
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• pp.83-90
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• 2023

To our knowledge, this is the first study aiming to optimize the extraction conditions of total phenolic compounds (TPC) and total flavonoids contents (TFC) from Argania spinosa leaves using Response Surface Methodology (RSM) with a Box-Behnken design (BBD). The optimal conditions obtained were 5% (w/v) solvent-to-solid ratio, 72.33% ethanol concentration, and 10h ours as an extraction time, which resulted in an extract with maximum TPC (131.63 mg GAE/g dw) and TFC (10.66 mg QE/g dw). Under the optimal extraction conditions, the antioxidant activity of the extracts of leaves of argan tree showed a moderate antiradical capacity of DPPH (IC₅₀ = 0,130 mg/mL) and ABTS (IC₅₀ = 0.198 mg/mL). However, the leaves of argan tree showed a very interesting reducing power of Iron (IC₅₀ = 0.448 mg/ml) which is similar to that of the ascorbic acid (IC₅₀ = 0.371 mg/mL).

• Journal of the Korean Society of Food Science and Nutrition
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• 제37권7호
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• pp.820-825
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• 2008

We investigated the antioxidant of heating pork, the physicochemical properties and antioxidative activities of Rubus coreanus Miq. extracts. The contents of moisture, crude fat, crude protein, crude fiber, and crude ash were measured. Soluble solid, acidity, pH and mineral contents were also investigated. The ethanol extract of Rubus coreanus Miq. was evaporated, and then sequentially extracted by hexane, ethyl acetate, butanol and water. The contents of total polyphenol ranged from 24.5 mg tannic acid equivalents (TAE) per g to 82.5 mg in all fractions. Antioxidative effects were investigated through DPPH free radical scavenging, $ABTS{\cdot}^+$ scavenging and TBARS methods. It was found that ethanol extract ($2,000\;{\mg}/mL$) and butanol extract ($1,500\;{\mg}/mL$) had 89.93% and 89.68% of DPPH free radical scavenging activities. As for ABTS, all extracts ($1,000{\sim}2,000\;{\mg}/mL$) except hexane showed over 90% scavenging activities. The lowest TBARS values were obtained from extract of ethyl acetate and ethanol, and their antioxidative activities were higher than that of ascorbic acid. The results of this study indicate that the ethyl acetate and ethanol extract of Rubus coreanus Miq. may be substituted for ascorbic acid in heating pork.

• Journal of the Korean Society of Food Science and Nutrition
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• 제34권6호
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• pp.862-868
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• 2005

Korean mountain ginseng roots were freeze-dried at $-70^{\circ}C$ and extracted by different extracting solution conditions to investigate chemical compositions of extracts. The soluble solid content of the extract from $7.04\~13.45\%\;and\;50\%$ EtOH and MeOH extracts were higher than those of other extracts. $100\%\;water\;and\;90\%$ EtOH extracts gave the highest Brix with $19.98\%$\;and\;19.65\%$, respectively. pH of the extracts were ranged from $5.82\~6.60$. Browning color at 470 nm of the extract were high value in 50$\%$ EtOH extract. In case of Hunter's color value, L value of extract was higher in $100\%$ water extract (21.28) than EtOH extract $(17.18\~21.02)$, a and b values of extract were the highest in $100\%$ water (-0.12) and $90\%$ MeOH extract (1.34). The contents of free sugars in the EtOH extract were increased with the ethanol concentration. Sucrose contents of $90\%$ EtOH and MeOH extracts were 6,159 mg/100 g and 5,238 mg/100 g. Major organic acids of the extract were citric and malic acids. Major free amino acids of the extract were L-arginine, L-proline, $\gamma$ -amino-n-butyric acid, alanine and aspartic acid. The highest ginsenoside content was shown to be about $10.50\%\;in\;90\%$ MeOH extract. Major minerals of extract were P, K, Na, Mg and Ca.

• Korean journal of food and cookery science
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• 제15권2호
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• pp.197-202
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• 1999

The objective of this study was to standardized the cooking method of Imjasootang, a traditional health food in summer. By mixing chicken soup with 20 g (I$_1$), 30 g (I$_2$), 40 g (I$_3$), 50 g (I$_4$) of seasam seeds, the distinctive characteristic and level of preference of Imjasootang were examined through the analyses of the proximate composition, fatty acid contents, color index, turbidity, brix$^{\circ}$, and sensory evaluation. 1. The proximate composition of Imjasootang was 90.2∼95.1% of total moisture, 0.985∼1.271% of crude protein, 0.90∼0.98% of crude fat, 1.592∼2.456% of nonfiber, 0.003∼0.004% of fiber, and 0.77∼0.97% of crude ash. Fatty acid were composed of 15.15∼17.36% of saturated fatty acid and 79.73∼82.54% of unsaturated fatty acid. Imjasootang contains high level of oleic acid and linoleic acid which were dependant on the content of seasame seeds. 2. For color index of samples, the lightness ranged 47.2∼56.9, “a”values 1.82∼2.15%, and “b”values 15.5∼16.5%. The turbidity of samples ranged 39∼61%, in which I$_4$ (chicken stock 100 g+sesame seed 50 g+water 25 g) was the most turbid. Solid content was also the highest in I$_4$, ranging 1.4∼5.1%. 3. In sensory evaluation, all sesame seed Imjasootangs had no significance differences in appearance. The higher the level of sesame seed in Imjasootangs, the more Imjasootang was preferred in terms of nutty aroma, color nutty taste. and viscosity. I$_4$ had the strongest nutty aroma. I$_2$ (chicken stock 100 g+sesame seed 30 g+water 15 g) and I$_3$ (chicken stock 100 g+sesame seed 40 g+water 20 g) were the best in the overall preference.

• Korean Journal of Food Science and Technology
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• 제41권4호
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• pp.423-427
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• 2009

This study investigated antithrombotic and hypocholesterolemic activities of defatted soybean grits (DSG) and fermented DSG (FD). The FD was prepared by the solid state fermentation using Bacillus subtilis NUC1 at $40^{\circ}C$ for 24h. The water extracts of fermented DSG (FDW) exhibited higher fibrinolytic activity and inhibition of platelet aggregation induced by ADP than water extracts of DSG (DW). However, the DW and FDW inhibited HMG-CoA reductase activity and significantly decreased the intracellular cholesterol contents in HepG2 cells. In addition, DW treatment did not show any cholesterol adsorption capacity, while FDW demonstrated the highest cholesterol adsorption by 90%. The results suggest that fermented DSG have significant antithrombotic and hypocholesterolemic effects in vitro and these activities were improved during fermentation by B. subtilis NUC1.