• 한국식품저장유통학회지
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• 제13권2호
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• pp.252-258
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• 2006

오미자를 이용하여 음료 제조를 하기 위한 오미자 추출의 최적조건을 알아보기 위하여 반응 표면 분석을 이용하였다. 각각의 반응표면분석 결과 고형분은 25배 이상의 용매비, $75^{\circ}C$이상 온도, $7{\sim}8$시간, 총산은 25배 이상의 용매비, $75^{\circ}C$의 온도, $6{\sim}7$시간, 페놀성 화합물은 25배의 용매비, $80^{\circ}C$의 온도, $6{\sim}7$시간, 환원당은 25배 이상의 용매비, $80^{\circ}C$ 이상의 온도, $6{\sim}8$시간, 비타민 C는 25배 이상의 용매비, $80^{\circ}C$의 추출 온도와 $5{\sim}6$시간의 추출조건에서 최적의 추출조건을 나타내었고, 탁도의 경우는 7시간에서 $60^{\circ}C$이상, 용매비는 25배 이상일 때 탁도가 가장 높게 나타났다. 이에 따라 시간을 6시간으로 고정하여 각각의 추출조건에 따른 특성을 알아본 결과 Fig. 3과 같은 결과를 얻었다. 비타민 C, 환원당, 페놀성 화합물, 그리고 가용성 고형분의 함량은 높고, 음료 제조 시에 강한 신맛을 주어 제조된 음료의 기호도에 좋지 못한 영향을 줄 수 있는 총산의 양은 적은 지점을 임의적으로 정하여 최적 추출 조건으로 선정하였으며, 이 범위의 온도는 $65^{\circ}C$, 용매비는 25배로 예측한 결과 가용성 고형분은 2.2%, 비타민 C는 530 mg/g, 환원당은 479 mg/g, 페놀성 화합물은 260 mg/g, 총산의 함량은 190 mg/g, 탁도는 1.18 (O.D)로 나타났다. 결정한 최적 추출조건에서 오미자를 추출한 결과 고형분 1.9%, 비타민 C 451mg/g, 환원당 397 mg/g, 페놀성 화합물 260 mg/g, 총산의 함량 170mg/g, 탁도 1.20 (O.D)와 같은 결과를 얻었으며 반응표면분석에서 예측한 것과 다소간의 양호한 결과로 나타났다.

• 한국축산식품학회지
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• 제43권6호
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• pp.1128-1149
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• 2023

In order to extend the shelf life of refrigerating raw lamb by inhibiting the growth of microorganisms, preventing the oxidation of fat and protein, and absorbing the juice outflow of lamb during storage, an active packaging system based on plastic/gelatin bilayer film with essential oil was developed in this study. Three kinds of petroleum-derived plastic films, oriented polypropylene (OPP), polyethylene terephthalate, and polyethylene, were coated with gelatin to make bilayer films for lamb preservation. The results showed significant improvement in the mechanical properties, oxygen, moisture, and light barriers of the bilayer films compared to the gelatin film. The OPP/gelatin bilayer film was selected for further experiments because of its highest acceptance by panelists. If the amount of juice outflow was less than 350% of the mass of the gelatin layer, it was difficult for the gelatin film to separate from lamb. With the increase in essential oil concentration, the water absorption capacity decreased. The OPP/gelatin bilayer films with 20% mustard or 10% oregano essential oils inhibited the growth of bacteria in lamb and displayed better mechanical properties. Essential oil decreased the brightness and light transmittance of the bilayer films and made the film yellow. In conclusion, our results suggested that the active packaging system based on OPP/gelatin bilayer film was more suitable for raw lamb preservation than single-layer gelatin film or petroleum-derived plastic film, but need further study, including minimizing the amount of essential oil, enhancing the mechanical strength of the gelatin film after water absorption.

• Food Science and Biotechnology
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• 제15권6호
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• pp.925-930
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• 2006

Chitosan-based nanocomposite films were prepared using a solution intercalation method incorporating varying amounts of organically modified montmorillonite (Cloisite 30B) from 0 to 30 wt%. The nanocomposite films prepared were optically clear despite a slight decrease in the transmittance due to the spatial distribution of nanoclay. X-ray diffraction patterns indicated that a certain degree of intercalation or exfoliation formed when the amount of clay in the film was low and that microscale tactoids formed when the clay content in the sample was high (more than 10 wt%). The tensile strength (TS) of the chitosan film increased when the clay was incorporated up to 10 wt% and then decreased with further increases in the clay content of the film. The elongation at break (E) increased slightly upon the addition of low levels of clay up to 5 wt% and then decreased with further increases in the amount of the clay in the film. The water vapor permeability (WVP) decreased exponentially with increasing clay content. The water solubility (WS) and swelling ratio (SR) of the nanocomposite films decreased slightly, indicating that the water resistance of the chitosan film increased due to the incorporation of the nanoclay.

• 한국식품영양학회지
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• 제34권2호
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• pp.181-186
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• 2021

Antioxidant properties and antioxidant activities were analyzed for water extracts and 50% and 70% ethanol extracts of the leaf of Angelica gigas Nakai. The polyphenol and flavonoid contents in water, 50%, and 70% ethanol extract of the leaf of Angelica gigas Nakai, it was found that the polyphenol contents were 18.75 mg GAE/g, 28.95 mg GAE/g, and 34.73 mg GAE/g, respectively, and flavonoid contents were respectively. The DPPH IC50 scavenging activity was 45.84 mg/mL, 36.44 mg/mL, 19.11 mg/mL, respectively, and theABTS+ radical scavenging ability (1 mg/mL) was 28.73%, 22.79%, and 12.70%, respectively. Tyrosinase inhibitory activity, 70% ethanol extract, 50% ethanol extract, and water extract 33.14%, and 4.53%, respectively. Nitrite scavenging activity, 70% ethanol extract, 50% ethanol extract, and water extract were in the order of 1 mg/mL scavenging activity, 36.43%, 34.80%, and 18.85%, respectively.

• 한국식품조리과학회지
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• 제26권1호
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• pp.54-61
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• 2010

This study was performed to determine the optimal manufacturing conditions adding green laver, which has a rich aroma and unique taste, to Sulgidduk. The variables in green laver Sulgidduk production were amounts of green laver powder and water. Six sensory characteristics were used for sensory evaluations, including color, green laver flavor, green laver taste, moistness, softness, and elasticity. The optimal amounts of the powder and water were found to be 6.84 g for green laver powder and 31.08 g for water, satisfying a target sensory score (7.0/9.0) according to a response surface method. Sulgidduk with these optimal amounts of green laver and water was tasted by 118 consumers and showed a high acceptability score (6.94). Older consumers ($\geq$30 years old) preferred the color and flavor of green laver significantly more than younger consumers ($\leq$29 years old) did (p<0.01). Color analysis results of green laver Sulgidduk were significantly different in brightness, redness, and yellowness from those of Sulgidduk (control)(p<0.01). Texture analysis scores of green laver Sulgidduk were significantly lower than those of Sulgidduk (control) in hardness, adhesiveness, springiness, cohesiveness, gumminess, and chewiness, and they were significantly different in adhesiveness and chewiness (p<0.05).

• 한국수산과학회지
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• 제40권5호
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• pp.293-299
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• 2007

The distribution of hemolytic Vibrio sp. from sea water of three main beaches located in Busan (Gwangan(G), Haeundae(H) and Songjeong(S) beaches) was investigated from June to September 2006 ; this is mid-summer and the main season for bathing. The monthly detection ratio from each beach was 29.2% (7 of 24 samples, G), 33.3% (8 of 24 samples, H), and 16.7% (4 of 24 samples, S). The most probable number(MPN) of strains detected ranged from 1.8-36(G), 1.8-180(H) and 1.8-18(S) MPN/100mL. Of the isolated strains, 24 strains showed definite hemolytic activity. These 24 strains were identified as Vibrio fluvialis, Vibrio vulnificus, Aeromonas hydrophila, Actinobacillus ureae and Eikenella corrodens. Vibrio fluvialis was detected from all three beaches investigated. Vibrio vulnificus was detected from Haeundae and Gwangan beaches. Gwangan beach had a higher detection ratio of Vibrio sp. than Haeundae and Songjeong beaches. These results suggest that seafood harvested from the vicinity of theses beaches may cause food poisoning and risk management to prevent Vibrio septicemia is required, especially for Haeundae and Gwangan beaches.

• Preventive Nutrition and Food Science
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• 제9권1호
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• pp.95-97
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• 2004

An angiotensin converting enzyme (ACE) inhibitory substance was isolated and purified from Lycium chinense Miller. A crude water extract of Lycium chinense Miller was prepared by adding it to water shaking at $25^{\circ}C$ for 1 hr, followed by centrifugation at 8000 ${\times}$ g for 30 min. The crude extract was then filtered using YM-3 and YM-1 membranes. An ACE inhibitor was isolated using consecutive chromatographic methods including: ion exchange chromatography, gel permeation chromatography, and FPLC. The inhibitor was identified to have a molecular mass of 862 daltons by mass spectrometry.

• Food Science and Biotechnology
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• 제18권6호
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• pp.1545-1547
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• 2009

The fiber-rich fractions including enzyme treated insoluble dietary fiber, alcohol insoluble solid, and water insoluble solid were prepared from the peel of soft ripe persimmon, and to evaluate and compare the yields, proximate compositions, monosaccharide profiles, and functional properties. The results showed that uronic acid was the main sugar followed by glucose, which indicated that all insoluble fibers were mainly composed of pectic substances and cellulose. The presence of xylose and fucose indicated the occurrence of hemicellulose. All fiber-rich fractions were exhibited high yield and functional properties. Thus, the peel of ripe persimmon could be used as fiber supplements.

• Plant Resources
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• 제8권2호
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• pp.96-102
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• 2005

As part of developing natural food preservatives, the antimicrobial effect of ethanol and water extracts from the Cruciferous vegetable was examined Korean traditional Brassica juncea Coss. was used widely as an ingredient of Kimchi, a natural flavoring and spice for a long time. Antimicrobial activities were examined against 15 microorganisms which were food-born pathogens and/or food poisioning microorganisms and food-related bacteria and yeasts. Ethanol extract from leaf mustard showed an antimicrobial effect in most of the strains used in the present study. The lowest minimum inhibitory concentration (MIC) were seen in Bacillus subtilis and Bacillus natto at 10 mg/ml. MIC of water extract was 40-60 mg/ml for bacteria and yeast. Antimicrobial activity of the ethanol extract was not disappeared by the heating at $121^{\circ}C$ for 15 min and not affected by pH.

• 한국식품과학회지
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• 제36권3호
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• pp.518-521
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• 2004

이상계 용매시스템을 이용하여 물질을 고순도로 대량 분리 할 수 있는 기술인 countercurrent chromatography를 이용하여 인삼으로부터 생리황성 성분인 saponin을 대량 분리 농축하였다. 용매 조성별 인삼 saponin의 분배계수에 따른 인삼 saponin 분리에 적합한 용매시스템은 chloroform/methanol/water(40/39/21, v/v/v)으로 결정되었으며 HSCCC의 작동 조건은 chloroform/methanol/water 용매시스템의 하층부를 이동상으로 한 head to tail mode에서 이동상의 유속 5mL/min, 인삼추출물 injection량 $200{\mu}L$, 컬럼회전속도 800 rpm의 조건이 적합한 것으로 판단되었다. 이러한 조건하에서 분리된 인삼saponin의 양은 $550.7{\mu}g$으로 HSCCC에 주입한 인삼 추출물 $200{\mu}L$중에 존재하는 총 saponin의 양 $865.5{\mu}g$에 비교하여 전체 수율은 63.6%로 나타났으며 TLC로 각 분획의 순도를 확인할 수 있었다.