• KSBB Journal
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• v.17 no.1
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• pp.68-72
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• 2002

Supercritical Carbon Dioxide was evaluated and optimized for the enrichment and fractionation of the essential oil and the bitter principles of hops, both of which contribute to the flavor of beer, Selected conditions of extraction(pressure, temperature and co-solvent) influenced the composition, the olfactory results and the colour of the extract. Optimal extraction conditions were 30 min, 1800 psia and $ >45^{\circ}C $ with co-solvent. Under these conditions, yield was 65% from brewer's yeast. The bittering substances from brewer's yeasts almost were removed.

• Korean Journal of Food Science and Technology
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• v.35 no.6
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• pp.1104-1109
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• 2003

Response surface methodology (RSM) was used to investigate the effects of the processing parameters on supercritical $CO_2\;(SC-CO_2)$. extraction of total carotenoids and ${\beta}$-cyptoxanthin from Citrus unshiu press cake. The parameters tested were $SC-CO_2$ pressure, dynamic extraction time, and concentration of ethanol added as the modifier to $CO_2$. Experimental data correlated well with the processing parameters (p<0.01), and there was a high statistically significant multiple regression relationship for the extraction of total carotenoids and ${\beta}-cyrptoxanthin$ ($R^2=0.9789$ and 0.9796, respectively). The optimal processing conditions were extraction pressure 33.4 and 37.3 MPa, extraction time 39.6 and 41.0 min, ethanol concentration 18.6 and 17.0% for total carotenoids and ${\beta}-cryptozanthin$, respectively. Maximum extraction yields predicted by RSM were 61.1 and 95.8% ppm, respectively. The extraction yield of total carotenoids increased asymptotically with the increase of the extraction pressure. It increased in proportion to extraction time and concentration of the cosolvent. The extraction yield of ${\beta}-cryptoxanthin$ increased with extraction pressure, extraction time, and concentration of the cosolvent. The extraction time and the concentration of the cosolvent, and the interaction between extraction time and the concentration of the cosolvent significantly affected the extraction yields of carotenoids from C. unshiu press cake.

• KSBB Journal
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• v.23 no.2
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• pp.153-157
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• 2008

Maca (Lepidium meyenii) has been used as a food and medicine in Peru for thousands of years. More recently a wide array of commercial maca products have gained popularity as dietary supplements with claims of anabolic and aphrodisiac effects. Even though the biologically active principles of maca are not fully known, the lipidic extract of maca tubers containing macamides showed promising physiological activities. In this study, the lipidic extract were collected from maca tubers by using supercritical carbon dioxide ($SCO_2$). Substance estimated as macamide in the extract was isolated and purified by preparative HPLC with recycling system. Two of the purified substance was identified as N-benzyl-5-oxo-6E,8E-octadecadienamide and N-benzylhexadecan amide by LC/MS, $^1H$-NMR and $^{13}C$-NMR analyses.

• Journal of Life Science
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• v.20 no.11
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• pp.1691-1696
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• 2010

Neohesperidin is a natural new nutrition sweetener, widely existing in plants of dry citrus peel, which can be derived from extraction. Since the sweetness is 1,300-1,500 times greater than that of sugar, neohesperidin are widely used in fruit juices, wines, beverages, bakeries and pharmaceutical formulations, and are particularly suitable for consumption by diabetic patients. However, the yield of extraction from citrus peel waste is very low. In this study optimal yield conditions were determinedusing response surface methodology (RSM) in order to increase the neohesperidin extraction yield. The critical factors for maximum extraction yield were selected extraction pressure ($x_1$), extraction time ($x_2$), and concentration of ethanol ($x_3$). As a result, the extraction yield was improved when the extracting pressure increased. The extraction yield also increased in a time-dependent manner. When adding ethanol as an assistance solvent to the supercritical carbon dioxide, extraction yield was increased as more ethanol concentration was added. Finally, the extraction yield of neohesperidin was improved to about 162.22% compared to ethanol extraction as a conventional method.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.1
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• pp.698-704
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• 2020

Although various biological extracts derived from the resources from Jeju are currently being developed for cosmetic materials, few studies using Brown algae from Jeju have been conducted. This study identified materials with high antioxidant levels and examined their whitening effects to assess their feasibility as potential cosmetic resources. Brown algae from Jeju (Undaria pinnatifida (Harvey) Suringar, Laminaria japonica, Ecklonia cava, Hizikia fusiforme (Harvey) Okamura (HF), and Sargassum fulvellum (Turner) C. Agardh (SF) were processed using a supercritical fluid system at 50℃ and 400 bar, and their total phenol content, antioxidant activity, tyrosinase inhibition, and primary skin irritation were measured. Of all the samples, only SF using the supercritical fluid system (SFS) displayed concentration-dependent behavior for the total phenol content (p<0.05). Among the samples, the antioxidant activity of SFS was significantly higher (p<0.05) and the one increased at higher concentrations (p<0.05). On the other hand, tyrosinase was inhibited to a greater extent with HF than the others. The primary skin irritation tests showed that none of the samples were skin irritants. This study confirmed the feasibility of using Phaeophyceae from Jeju as potential cosmetic materials, where the samples can be selected and utilized based on the required physicochemical properties.

• Journal of the Korean Society of Food Science and Nutrition
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• v.43 no.3
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• pp.439-445
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• 2014

This study aimed to determine the quality characteristics of ginseng seed oil as well as evaluate the efficacy of ginseng seed oil as a food resource. Ginseng seed oil was obtained by different extraction methods; from solvent extraction oil, supercritical fluid extraction oil, and screw pressed extraction oil. Total unsaturated fatty acids were present at 97.72~97.92%. Oleic acid (80.13~81.16%) was the highest, followed by linoleic acid (14.98~15.69%). The total phenol content (mg gallic acid equivalent/100 g oil) was higher in screw pressed extraction oil ($56.32{\pm}1.47$) compared to others. ${\gamma}$-Tocopherol was only present in ginseng seed oil and screw pressed extraction oil showed the highest levels of ${\gamma}$-tocopherol ($5.95{\pm}0.25$ mg/100g oil) among the tested samples. Screw pressed extraction oil showed the greatest oxidative stability with an induction time of 16.58 hours. Acid values and peroxide values of ginseng seed oil increased with increasing storage period. The total phenol and ${\gamma}$-tocopherol contents were higher in screw pressed extraction oil than in other ginseng seed oils, which suggests that screw pressed extraction oil has the greatest oxidative stability.

• Proceedings of the Korean Aquaculture Society Conference
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• 2006.05a
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• pp.107-108
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• 2006

• Journal of the Korean Graphic Arts Communication Society
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• v.16 no.1
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• pp.69-79
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• 1998

The type photographic optical system is designed by using numerical method. Initially the paraxial quantites, numerical solutions are found for the system which is free from the Seidel seven aberrations. The final system has f/4 with the half field angle 20$^{\circ}$, and the image size is 36mm with the focal length of 50mm.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2000.10a
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• pp.91-92
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• 2000

식용해조류인 미역(Undaria pinnatifida)은 늦가을부터 겨울, 이른 봄 동안 자라고 봄부터 초여름까지 성숙하는 1년생 해조류로 내만의 입구에 가까운 곳이나 조류가 빠른 곳에서 번식을 하며 극동아시아와 우리나라 전 해안에 광범위하게 분포되어 있는 갈조류로써 그 생산량은 식용해조류중 62％를 차지하고 있으며 산후식품 또는 병약자의 건강을 회복하는 영양식으로 중요할 뿐만 아니라 특유의 부드러운 해조류 맛과 탁도 및 점성으로 오랫동안 섭취해 온 식품이다. (중략)

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2000.05a
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• pp.100-101
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• 2000

식용해조류인 미역(Undaria pinnatifida)은 늦가을부터 겨울, 이른 봄 동안 자라고 봄부터 초여름까지 성숙하는 1년생 해조류로 내만의 입구에 가까운 곳이나 조류가 빠른 곳에서 번식을 하며 극동아시아와 우리나라 전 해안에 광범위하게 분포되어 있는 갈조류로써 그 생산량은 식용해조류 중 62%를 차지하고 있으며 산후식품 또는 병약자의 건강을 회복하는 영양식으로 중요할 뿐만 아니라 특유의 부드러운 해조류 맛과 탁도 및 점성으로 오랫동안 섭취해 온 식품이다. (중략)