• Korean Chemical Engineering Research
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• v.46 no.4
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• pp.660-664
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• 2008

In this work, analytical HPLC was utilized to obtain Tanshinone IIA (TIIA) from Salvia Miltiorrhiza Bunge (SMB). The optimum operating conditions were experimentally determined to analyze the TIIA in the pretreated extract. SMB was extracted with the various organic solvents of methanol, ethyl acetate, and ethanol, then the extract was analyzed to compare the amount of TIIA. From the results, the methanol showed the best extraction efficiency of TIIAd. The analysis by $C_{18}$ column was performed. The mobile phase was composed of methanol and water, and the isocratic elution mode was mainly applied. $2.154{\mu}g$ of TIIA/mg of SMB powder was extracted with methanol.

• Food Science and Preservation
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• v.8 no.1
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• pp.86-91
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• 2001

To study the availability of the Korean Atractylodes japonica Koidz. as ingredients for functional flood, functional properties of solvent extracts were investigated and the results were followed. Yield was 14.8% by ethanol extraction of fresh Korean A. Japonica and 17.7% by water fraction. Acetone extract and butanol fraction showed stronger activity of the hydrogen donating activities, each of 72.9% and 74.2%, respectively, in fresh Korean A. japonica and methanol extract and butanol fraction showed stronger activity of the nitrite scavenging effects, each of 95.0% and 79.2%. in fresh Korean A. japonica. Among the solvent extacts from fresh Korean a. japonica, extract by methanol showed strong antimicrobial activity in which clear zone showed 20 mm for Bacillus subtilis and 19 mm for Pseudomonas aeruginosa. Butanol fraction derived from methanol extract showed moderate antimicrobial activity : 18 mm clear zone for Bacillus subtilis and Vibrio parahaemolyticus. Minimum inhibitory concentrations of methanol extract and butanol fraction were about 2 mg/disc and 4 mg/disc against gram(+) bacteria and 6 mg/disc against gram(-) bacteria, respectively.

• Journal of the Korean Society of Food Science and Nutrition
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• v.38 no.7
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• pp.817-823
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• 2009

This study was conducted to determine the optimal extraction conditions for maca by comparing the yields, total polyphenol contents, superoxide dismutase (SOD)-like activity and the nitrite scavenging ability. The proximate composition analysis showed 6.57% moisture, 12.83% crude protein, 1.05% crude fat, 4.80% ash and 74.75% carbohydrate. Maca was extracted with 7 different solvents (water, methanol, ethanol, acetone, ethyl acetate, chloroform and hexane) and the extracts were tested for biological activities. The extraction yields of water, methanol and ethanol extracts were 46.2%, 21.4% and 16.8%, respectively. Acetone, ethyl acetate, chloroform and hexane exhibited very low extraction yield, ranging from 0.2 to 1.0%. Total polyphenol contents and the nitrite scavenging ability were the highest in water extract. Electron donating ability and the SOD-like activity were the highest in methanol extract. When water extract was drawn out at different extraction temperatures (30, 70, $100^{\circ}C$) and time (1, 3, 5 hr), the improved biological activities (total polyphenol contents, electron donating ability, SOD-like activity and nitrite scavenging ability) were found in extracts treated at $100^{\circ}C$ for 3 or 5 hrs.

• Textile Coloration and Finishing
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• v.29 no.3
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• pp.171-179
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• 2017

This study was to investigate the practicality and functionality of water lily(Nymphaea tetragona) leaves as a natural dye resource while searching for various dyeing methods to utilize them. Effect of dyeing condition including methanol ratio of dyebath, dyeing temperature and time, mordanting method, etc were investigated. Colorants were prepared by extraction in methanol and followed drying process. When composing 30% of methanol in the dyebath, better dyeuptake and uniform dyeing were resulted. Pre-mordanting method gave better results in terms of dye uptake than post-mordanting method on the wool fabrics. Fe and Ti were effective for increasing the dye uptake on the silk fabrics. Depending on mordant type and mordanting method, the dyed fabrics got various color showing green, khaki, brownish yellow, dark brown, dark gray and so on. As for color fastness, the silk fabrics dyed with water lily extract showed relatively high rating in light fastness(3~4, 4~5 rating), washing fastness(4~5, 5 rating), and rubbing fastness(4, 4~5 rating). The silk and wool fabrics dyed with water lily leaves extract showed excellent antimicrobial activity over 98% of bacterial reduction rate against Staphylococcus aureus and Klebsiella pneumoniae. It was confirmed that water lily leaves can be used as a natural dye resource for dyeing wool and silk fabrics because its colorants showed excellent affinity and antimicrobial functionality as well as good colorfastness.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.56 no.4
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• pp.526-531
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• 2023

This study investigated the ingredients, anti-aging and anti-dementia activities of the Korean marine algae Silvetia siliquosa. The S. siliquosa solvent extracts were prepared with 70% ethanol, 80% methanol, and distilled water. The extraction yield range of various solvent extracts was 15.82-49.98%. The ethanol and methanol extracts had higher tyrosinase and collagenase inhibitory activities than those of the water extract. Meanwhile, all extracts exhibited high elastase inhibitory activity. Conversely, the methanol and water extracts exhibited the highest acetylcholinesterase inhibitory activity (IC₅₀, 0.40 mg/mL) and β-secretase inhibitory activity (IC₅₀, 0.81 ㎍/mL), respectively. These results indicate that S. siliquosa may be useful in food and pharmaceutical materials as a cosmetic and functional.

• Preventive Nutrition and Food Science
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• v.16 no.4
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• pp.321-327
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• 2011

Water, methanol and ethanol extracts of ginseng leaves were assayed for total phenolics and flavonoids, ascorbic acid, cupric and ferrous ion chelating activities, 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity, ferric reducing antioxidant power (FRAP) assay and ABTS radical cation decolourization (TEAC) assay for their antioxidant properties. The ethanol extract of ginseng leaves contained significantly (p<0.05) higher amounts of total phenolics and flavonoids (600.57 and 1701 mg/100 g) than methanol (374.43 and 1512.64 mg/100 g) and water extracts (248.30 and 680.05 mg/100 g). Among solvent extracts of ginseng leaves, the ethanol extract showed the most powerful antioxidant activities. However, the ferrous ion chelating activity of ginseng leaf extracts were lower than the cupric ion chelating ability. These differences in concentrations of key antioxidants among various solvent extracts seemed to be responsible for their differences in antioxidant activities. These results suggest that ethanol extract of ginseng leaves has the most effective antioxidant capacity compared to the methanol and water extracts tested in the present study. Thus, it can be applied for the effective extraction of functional material from ginseng leaves for the usage of pharmaceutical and/or food industries.

• Food Science and Biotechnology
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• v.17 no.1
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• pp.46-51
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• 2008

The objective of this study was to investigate antioxidant activities of freeze-dried, main root, and fine root of ginseng (Panax ginseng CA. Meyer), which were extracted with various solvents including ethanol, methanol, and water. Ethanol extracts in both parts showed the most powerful scavenging activities against DPPH radicals. Especially, ethanol extract of fine root had higher reducing power and antioxidant capacity than that of main root. The highest antioxidant activity in linoleic acid emulsion system was also observed in fine root extracted with ethanol, followed by methanol and water. Both ferrous ion chelating activity and ferric reducing antioxidant power (FRAP) of extracts were increased with the increase of extracts concentration. These results suggest that ethanol extract of fine root of ginseng has the most effective antioxidant capacity compared to the methanol and water extracts tested in the present study. Thus it can be applied for the effective extraction of functional material from ginseng for the usage of pharmaceutical and/or food industries.

• Natural Product Sciences
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• v.29 no.1
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• pp.1-9
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• 2023

This study assessed in vitro antioxidant activity (ABTS⁺ and DPPH) of Vitex rotundifolia seeds collected from two different regions in Korea (Jungjang City and Sindu City). Three extraction methods using ethanol, methanol, and water were prepared separately and subjected to quantification by reverse-phase high-performance liquid chromatography-photodiode array (HPLC-PDA) analysis as well as antioxidant testing. Among them, the water-based extract exhibited superior activity in the ABTS⁺ compared with the ethanol- and methanol-based extracts, while the DPPH assay analysis, revealed that the methanol-based extract had very low antioxidant activity. The concentrations of vanillic acid (1), luteolin (2), vitexicarpin (3), and artemetin (4) were quantified using HPLC-PDA analysis. Vanillic acid (1) was identified as the main antioxidant in V. rotundifolia seeds. Combining the antioxidant activity and quantitative analysis results, the water-based extract was considered to have the highest antioxidant activity. Furthermore, vanillic acid (1) was detected in the leaves and stems of V. rotundifolia plants from different regions, indicating that this species has the potential for use in future antioxidant-applications.

• Journal of the Korean Society of Food Science and Nutrition
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• v.24 no.6
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• pp.948-955
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• 1995

To investigate the antimicrobial activities of mustard seed(Brassica juncea), a series of solbents were examined for extraction of antimicrobial substances from mustard seed and then antimicrobial substances were identified by simultaneous distillation extraction(SDE) and GC-MS methods. Water and methanol extracts of mustard seed showed antimicrobial activitries against experimental strains while those from hexane extract almost was not observed. The distilled components of mustard seed by SDE method showed strong antimicrobial activities, methanol extract of residues fraction exhibited a little, and water layer with the exception of distilled components showed no antimicrobiol activities. The 30 varieties of distilled components including 3 types of isothiocyanate such as 3-isothiocyanate-1-propene, 4-isothiocyanate-1-butene, and 3-isothiocyanatoethyl benzene were identified from mustard seed.

• Journal of the Korea Convergence Society
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• v.11 no.2
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• pp.85-91
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• 2020

Polyphenols extraction conditions including extraction solvent, temperature, pH and time were optimized for the development of functional bio-convergence materials using non-edible parts of Aronia melanocarpa including its berry. Water, ethanol, and methanol were used for the extraction of polyphenol from aronia leaves, stem and twigs. Water was selected as an extraction solvent because water gave the highest extraction yields. Among the non-edible parts, aronia leaves had the highest total polyphenol content. The polyphenol extraction conditions from aronia leaves were statistically optimized using a experimental design method: reaction time of 4.5 h, extraction temperature of 79.3℃, and pH 7.2. These optimized extraction conditions could be used for the production of functional bio-material.