• Food Science and Preservation
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• v.6 no.4
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• pp.380-385
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• 1999

Four cultivar of astringent persimmon(Diospyros kaki L. Cheongdobansi, Sagkoksi, Gojongsi, and Hachiya) were evaluated for quality during 160 days storage in condition of air, 12%CO$_2$+3%CO$_2$, and 16%CO$_2$+ 3%CO$_2$at 0∼2$^{\circ}C$. In the fruits of Cheongdobansi, Sagkoksi, and Gojongsi cultivar, the soluble solids content did not change significantly during storage among treatment, but in the fruits of Hachiya cultivar it decreased during storage in the codition of high CO$_2$concentration. Fruits of Cheongdobansi and Sagkoksi, which were stored in higher CO$_2$concentration, had firmer hardness, less weight loss and decay, showed greater rentention of initial peel color, maintained best qulity than air-stored fruit, but had high tannin contents. And it was necessory to remove astringency for edible fruits.

• Journal of the Korean Ceramic Society
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• v.35 no.11
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• pp.1155-1161
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• 1998

We have studyed the surface electric resistiance for inner conductive film consisted of graphite and iron oxide by coating the conductive paint on inner face of 28" wide CRT funnel and have evaluated the working properties of 28" wide CRT according to the surface electric resistiance. We found that the viscosity of paint and the thickness of conductive film became the higher but the surface electric resistiance of con-ductive films was the lower than before in accordance with the increase of solid contents in conductive paint and that the surface condition and the surface electric resistiance of conductive films changed highly ac-cording to the drying conditions also. From these results we could get the uniform thickness and the un-iform film resistance and the optimum working property of selectric propertise in CRT when we used the conductive paint with solid contents 28% and viscosity about 13cps.

• Journal of the Korean GEO-environmental Society
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• v.11 no.8
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• pp.25-32
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• 2010

Contamination of soil and groundwater by the compounds of hydrocarbon petroleum has been widely accepted as the main cause that harms the environments and health. To remove those pollutants, absorbing clothes, activated carbons, or oil-water separation devices with the gravity method are employed for treatment. However, those materials and devices cannot remove the emulsion pollutants despite of their efficiency for removing free products. Therefore, we investigated the problems which occur during the groundwater treatment for the highly concentrated suspended solid particles, which can be resulted from excavation, and to propose methods to remove TPH(Total Petroleum Hydrocarbon). After coagulation experiment with high molecular polymers, the concentration of SS(Suspended Solids) and COD(Chemical Oxygen Demand) turned to satisfy the groundwater quality criteria within 5 minutes while the concentration of TPH failed to meet the water quality standard of effluent. Consequently, the water quality criteria for effluent could not be met by single DAF(Dissolved Air Flotation) process. However all water quality criteria could be satisfied after 20 minutes when coagulation reactions are carried out simultaneously in the DAF reactor.

• Food Science and Preservation
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• v.23 no.3
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• pp.413-421
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• 2016

The aim of this study was to investigate physicochemical properties of porcine blood hydrolyzed by proteases under various conditions for utilization as a food source. Five kinds of proteases (Alcalase, Neutrase, Protex-40L, PTPF-1430, and KMFP-15) were tested at different concentrations (0.1, 0.2, and 0.3%, w/v) during hydrolysis at 55 for 4 hr. Hydrolysis with $^{\circ}C$ KMFP-15 showed the lowest pH by 7.3. The highest soluble solid ($24.3^{\circ}Brix$) and free amino acid (4,944 mg%) contents were obtained by hydrolysis with KMFP-15 (w/v) at 0.2% addition level, which was not significantly different from the sample hydrolyzed at 0.3% level. Under the optimal condition of KMFP-15 at 0.2%, porcine blood was hydrolyzed at 60 up to 8 hr. The $^{\circ}C$ free amino acid content reached the highest at 4 hr, and then decreased with longer hydrolysis time. Under the optimal hydrolysis conditions, porcine blood hydrolysis powder had plenty of crude proteins, amino acids, and minerals, including iron, potassium, and zinc. The results showed that porcine blood could be utilized as an useful source of food supplement. The optimum conditions of hydrolyzing porcine blood, using 0.2 KMFP at $60^{\circ}C$ for 4 hr, can be used in the commercial production of protein supplements, amino acid sources, and iron fortifying agents.

• Proceedings of the KAIS Fall Conference
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• 2007.11a
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• pp.386-389
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• 2007

본 논문은 $TiO_2$(Degussa, P-25), 바인더(A-9540) 그리고 용제의 배합비율을 바꾸어 코팅액을 제조하여 금속판에 코팅한 후, 고농도의 IPA를 주입하여 분해효율을 고찰하였다. 고형분 함량 비율 변화에서는 $TiO_2$ 함량은 증가하고 바인더가 감소할수록 좋은 효율을 보였고, 용제는 ethanol과 MEK 두 가지 중에 MEK의 분해효율이 좋았다. 용제(MEK)함량 비율 변화에서는 일정량의 용제가 있을 경우 분해효율이 좋았고, 용제함량이 낮아질 경우 코팅액 점도가 높아지고 건조 후에는 표면이 갈라지는 현상을 보였다. 결국, 용제함량 비율 변화는 바인더 함량 실험에도 영향을 주어 1.75:0.25:10일 때 가장 좋은 분해효율을 보였다.

• Journal of the Korean Society of Food Science and Nutrition
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• v.31 no.3
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• pp.367-372
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• 2002

In order to utilize safflower seed effectively as a food material, it was processed at the conditions including roasting temperature/time of 170$\^{C}$/10 min to 210$\^{C}$/30 min, ethanol concentration of 0 to 100% (V/V) and enzyme hydrolysis with $\alpha$-amylase, $\beta$-amylase, amyloglucosidase and cellulase. Safflower seed extracts had the highest soluble solid content at the condition of 60% ethanol concentration, roasting at 190$\^{C}$ for 20 min and hydrolysis with amyloglucosidase. Total phenolic compounds increased with the ethanol concentration, showing the highest at the condition of 80% ethanol, roasting at 170$\^{C}$ for 30 min and hydrolysis with amyloglucosidase. High level total flavonoid was observed at the condition of 80% ethanol, roasting at 210$\^{C}$ for 30 min and hydrolysis with amyloglucosidase. Safflower seed had sucrose as major free sugar as well as xylose and arabinose as minor free sugars. Organic acids in safflower seed included oxalic, citric, magic and fumaric acid. Serotonin I (N-[2-(5-hydroxy-1H-indo-1-3-yl)ethyl]ftrulamide) and serotonin II (N-[2-(5-hydroxy-1H-indol-3yl)ethyl]-p-coumaramide) as antioxidant compounds increased with ethanol concentration, showing the highest revel at 60% ethanol. Acacetin content increased with temperature and roasting time, with a maximum of 69.47 mg% at 210$\^{C}$ for 30 min.

• Food Science and Preservation
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• v.30 no.4
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• pp.654-662
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• 2023

The Aster glehni extract has many therapeutic and medicinal values. Therefore, it is essential to set appropriate conditions for enzyme treatment to efficiently extract A. glehni. In this study, changes in the quality of A. glehni extract depending on the concentration and time of enzyme treatment was investigated to increase its effective utilization. Compared to the control, the pH of the extract of A. glehni its soluble solid content increased with the enzyme treatment. The color of the A. glehni extract changed from green-yellow to reddish-yellow with the increase in treatment duration. The fructose and sucrose contents of the extract were the highest at 7.73% and 6.78%, respectively, in the control group without the enzyme treatment. Glucose and maltose contents were 6.91% and 4.44% in the C group (3.2% enzyme concentration and 60 min for enzyme treatment), respectively. Total polyphenol content, which shows antioxidant activity, was the highest at 7.38 mg GAE/g in the E group (1.6% of enzyme concentration and 120 min for enzyme treatment). 2,2-diphenylpicrylhydrazyl (DPPH) and 2,2'-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid (ABTS) showed the highest radical scavenging activity in the C group (3.2% of enzyme concentration and 60 min for enzyme treatment). These results enable setting appropriate conditions of enzyme treatment in terms of enzyme concentration and time for the production of dry powders using A. glehni extract.

• Food Science and Preservation
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• v.7 no.3
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• pp.267-272
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• 2000

Microwave-assisted extraction (MAE, 2,450 MHz), which is known as a rapid and more environmental-friendly process than current extraction methods, was applied to oleoresin extractions from dried pepper. As fundamental parameters of MAE, optimum conditions were found, such as 60 mesh in particle size of the sampes, 1:10(g/mL) powders was high at lower concentrations of ethanol, whereas capsanthin content remarkably increased at more than 75% of ethanol concentration. The results showed that MAE of oleoresin and capsanthin from red pepper powders was successful in 3 to 5 min of the extraction time.

• Food Science and Preservation
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• v.8 no.1
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• pp.102-108
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• 2001

Flow properties of the concentrated pigment solutions extracted from purple-fleshed sweet potatoes were determined using a cone and plate rotational viscometer for soluble solids concentration range of 25 to 65% at temperature range of 20 to 60 $^{\circ}C$. The purple-fleshed sweet potato pigment solutions exhibited Newtonian behavior. Temperature dependency for the viscosity of the solution followed the Arhenius relationship with activation energy values between 14.23 and 43.00 kJ/mol, which increased linearly with soluble solids concentration. A relationship between viscosity, temperature and soluble solids concentration was investigated. At the same temperature, the viscosity of the concentrated pigment solutions increased exponentially as the concentration increased with higher degree of such phenomena at lower temperatures.

• Korean Journal of Materials Research
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• v.6 no.11
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• pp.1082-1089
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• 1996

본 연구에서는 resorcinol과 formaldehyde를 이요하여 수상에서 축중합시켜 겔을 만든 후 저온 초임계 건조 공정을 이용하여 겔 구조의 변형없이 용매를 제거하여 내무 표면적과 같은 에어로겔의 최종 물성에 미치는 영향을 알아보기 위하여 고형분의 농도(2-5%)를 변화시켜 실험한 결과 초기 반응조건이 반응시간 및 최종물성에 변수가 됨을 알 수 있었다. 또한 제조된 에어로겔에 100-30$0^{\circ}C$까지 온도를 가하며 표면 특성을 분석한 결과 열을 가함에 따라 기공의 크기가 커지고 표면적이 감소됨을 관찰할 수 있었다.