• Microbiology and Biotechnology Letters
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• v.35 no.2
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• pp.142-149
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• 2007

In this study, we investigated the biological activity of antioxidant and antibacterial activity of citrus by-product ferment. Hot water extracts and 80% methanol extracts from citrus byproduct of ferment were screened for antibacterial activity pathogenic bacteria by paper disc method. Among the various hot water extracts and 80% methanol extracts the Bacillus subtilis showed relatively strong antibacterial activities in the order. The reducing activity on the 1,1-diphenyl-2-picrylhydrazyl(DPPH) radical and ${\cdot}OH$ radical scavenging potential were sequentially screened, in search for antioxidant activities of citrus by-product ferment.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.57 no.3
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• pp.209-215
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• 2024

Ishige foliacea belongs to class Phaeophyceae and family Ishigeaceae. This study investigated the physiological activities of the Korean marine algae I. foliacea. Its solvent extracts were prepared with 70% ethanol, 80% methanol, and distilled water. The ethanol and methanol extracts had higher α-glucosidase (half-maximal inhibitory concentration, IC₅₀: 0.67-0.73 mg/mL), xanthine oxidase (IC₅₀: 0.25-0.28 mg/mL), and angiotensin-converting enzyme (IC₅₀: 25.29-38.28 ㎍/mL) inhibitory activities than those of the water extract. The ethanol and methanol extracts possessed high acetylcholinesterase inhibitory activity (IC₅₀: 0.78c0.97 mg/mL). Conversely, the water extract exhibited the highest β-secretase inhibitory activity (IC₅₀: 0.48 mg/mL). These results indicate that I. foliacea may be useful as a functional substance in food and pharmaceuticals with anti-diabetic, anti-gout, anti-hypertension, and anti-dementia properties.

• KSBB Journal
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• v.28 no.3
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• pp.177-184
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• 2013

This research was to investigate the inhibitory effects of tyrosinase, elastase and collagenase using rapeseed meal extract for the functional cosmetics. Gamma-tocopherol and alpha-tocopherol contents were 304.9 and 212.2 mg/kg, respectively. In the case of delta-tocopherol and plastochromanol-8, they were 12.1 and 35.7 mg/kg, respectively. The total phenol content of methanol extract was the highest (49.6 mg/g) which was about 4.96 fold higher than that of water extract. The maximum nitrite scavenging activities of methanol and acetone extract at pH 1.2 were 85.2 and 80.1%, respectively, at 8.0 mg/mL. When the extract concentration of rapeseed meal increased upto 2.0 mg/mL, cell viabilities did not appear to have any significant cytotoxic effect, irrespective of extracts. Tyrosinase and elastase inhibition activities increased from 25.2 to 42.5% and 25.3 to 48.0%, respectively, as methanol extract concentration increased from 0.5 to 1.0 mg/mL. The collagenase inhibition activities of methanol and acetone extracts at 1.0 mg/mL were 67.2 and 68.0%, respectively. These results showed that the methanol and acetone extract of rapeseed meal can be used as a new source of functional cosmetic agent.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.57 no.2
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• pp.137-144
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• 2024

In this study, we investigated the antioxidant and physiological activities of the Korean marine algae, Enteromorpha compressa. Solvent extracts of E. compressa were prepared using 70% ethanol, 80% methanol, and water, with extraction yields ranging from 9.55% to 25.67%. The total polyphenol and flavonoid contents ranged from 20.76-28.41 mg/g and 2.56-18.59 mg/g, respectively. Compared with the water extract, the ethanol and methanol extracts were found to have higher antioxidant activities. All three extracts were found to promote alcohol dehydrogenase and aldehyde dehydrogenase activities in a concentration-dependent manner, whereas the methanol and ethanol extracts were established to have the highest angiotensin-converting enzyme (ACE) inhibitory activity (IC₅₀=1.40 ㎍/mL) and β-secretase inhibitory activity (IC₅₀=0.17 ㎍/mL), respectively. These findings thus indicate that E. compressa could have beneficial application as a supplementary antioxidant and functional constituent in food and pharmaceutical materials.

• Journal of the Korean Society of Food Science and Nutrition
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• v.44 no.5
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• pp.681-686
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• 2015

The purpose of this study was to measure total phenolic compounds as a measure of antioxidant activity as well as ${\alpha}$-amylase inhibitory and ${\alpha}$-glucosidase inhibitory activities as a measure of anti-diabetic efficacy in methanol extracts from 23 kinds of medicinal plants. Extracts of three medicinal plant species showing high total polyphenol contents were selected (Euonymus alatus stem, Taxus cuspidata fruit, and Eucommia ulmoides leaf). Extracts of six medicinal plant species showing over 60% DPPH radical scavenging activity were also selected [Eucommia ulmoides barks (80.10%), Lycium chinense roots (64.25%), Euonymus alatus stem (73.59%), Lespedeza cuneata (78.20%), Taxus cuspidata fruits (70.52%), and Tilia taquetii leaf and stem (67.81%)]. Regarding ${\alpha}$-glucosidase and ${\alpha}$-amylase inhibitory activities acarbose showing approximately 80% inhibitory activity was selected as a control group, and six species (Eucommia ulmoides heartwood, Eucommia ulmoides bark, Euonymus alatus stem, Dioscorea batatas, Coix lachryma-jobi, and Phaseolus radiatus) showed greater than 80% ${\alpha}$-glucosidase inhibitory activity. Extracts of nine medicinal plant. species showing over 80% ${\alpha}$-amylase inhibitory activity (Pueraria thunbergiana root, Eucommia ulmoides bark, Eucommia ulmoides leaf, Lycium chinense fruits, Euonymus alatus leaf and stem, Euonymus alatus stem, Sasa borealis whole, Dioscorea batatas leaf and stem, and Tilia taquetii leaf and stem). Based on these results, medicinal plants showing high antioxidant and antidiabetic activities can be used as fundamental products in developing new medicines, as well as functional foods to prevent adult disease.

• Journal of Marine Bioscience and Biotechnology
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• v.1 no.4
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• pp.252-259
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• 2006

Extracts which were prepared by four different extractions - 80% methanol extracts (ME) at high ($70^{\circ}C$) and a room temperature ($20^{\circ}C$), respectively and aqueous extracts (AE) at both temperatures with the residue after the methanol extracts - of 10 green, 19 brown and 25 red seaweeds collected in Jeju Island coast were examined for their DPPH free radical scavenging activity using a ESR (electron spin resonance) spectroscopy. A variety of the extracts showed positive scavenging effect against DPPH free radical (except the green seaweeds). Among the extracts, the brown seaweed extracts exhibited the highest scavenging activity. Especially, Sargassum spp. of the brown seaweeds have remarkable scavenging activities - both methanolic and aqueous at the both temperatures ($20^{\circ}C$ and $70^{\circ}C$). On the other hand, ME showed better scavenging activity than AE in the red seaweed extracts. These results indicate that autogenous seaweeds in Jeju will be potential natural antioxidants for functional food compounds.

• Korean Journal of Food Science and Technology
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• v.40 no.5
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• pp.586-592
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• 2008

In this study, the nutritional components and functional activities of Sasa borealis leaf tea were evaluated. The proximate compositions were as follows; moisture 5.68%, crude protein 16.38%, crude fat 4.68%, nitrogen free extracts 32.37%, crude fiber 32.36%, and ash 8.53%, respectively. The mineral elements were as follows: K 2,133.83, Ca 1,144.09 and P 543.00 mg%, respectively. The amino acid contents of the Sasa borealis leaf tea were very rich in proline (1,275.26 mg/100 g) and deficient in cystine (71.49 mg/100 g). The major fatty acid components were linoleic acid (50.52%), palmitic acid (18.52%), and oleic acid (14.16%). Finally, based on our sensory evaluations, the $80^{\circ}C$ extracted Sasa borealis leaf tea evidenced the best overall quality. The contents of total phenol and total flavonoids of the 80% methanol and hot water extracts were 15.09, 7.69 mg/g and 12.03, 6.12 mg/g, respectively. The DPPH and $ABTS^+$ radical scavenging activities of the 80% methanol extract from Sasa borealis leaf tea were 86.87% and 83.85% at a concentration of 1.25 mg/mL. The 80% methanol and hot water extracts evidenced reducing power and inhibitory effects against acetylcholinesterase in a dose-dependent manner.

• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2008.04a
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• pp.25-27
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• 2008

The optimum extraction conditions of green tea used for a bath were investigated for later application to textile. The extraction was more effective in water and methanol than in ethanol. The optimum extraction temperature was determined as 80$^{\circ}C$ in water and 60$^{\circ}C$ in methanol. The extracts were more stable in acid and neutral conditions than in alkaline region. The UV satbility was better than generally expected. From the analysis of contents of active ingredients, the about 20% of effective catechin was appeared to be contained in the extract solid. The contents of polyphenol is 0.016g in the 0.1g extracts.

• Food Science and Preservation
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• v.14 no.3
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• pp.332-335
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• 2007

Hot water and 95%(v/v) ethanol extracts were prepared from dried Lespedeza cuneata seeds and antioxidant compounds were isolated by solvent fractionation, silica gel adslorption chromatography, Sephadex LH-20 column chromatography, and preparative HPLC. Antioxidant activity was measured using DPPH radical scavenging activity. The 80%(v/v)ethanol and ethylacetate fraction of Lespedeza cuneata seed extracts had stronger antioxidant effects than did the n-hexane fraction. The active antioxidant compounds obtained from hot water and 95%(v/v) ethanol extracts may be identical, based on analysis by Sephadex LH-20 column chromatography and preparative HPLC.

• Korean Journal of Plant Resources
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• v.31 no.5
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• pp.433-452
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• 2018

This study was conducted to select candidates from plant resources for the purpose of improving or treating Alzheimer's disease, a type of dementia. One hundred and eighty-four plant extracts at a final concentration of $100{\mu}g/ml$ were screened to determine their capacity to inhibit acetylcholinesterase (AChE) by in vitro assay. From this AChE assay, seven plant extracts - including methanol ext. and water ext. of Phellaodendron amurense Rupr. (bark), methanol ext. of Nelumbo nucifera Gaertn (stamen/ovary), methanol ext. of Persicaria tinctoria H. GROSS (flower), methanol ext. of Coptis chinensis (rhizome), ethanol ext. of Cinnamomum cassia Blume(bark) and ethanol ext. of Carthamus tinctorius L. (fruit) - showed effective inhibition activity ranging from 18.7% to 63.1%. The selected extracts were testified their inhibition activities on AChE and BuChE (butyrylcholinesterase) at concentrations of 25, 50, 100, $200{\mu}g/ml$. In the AChE assay, five extracts including methanol ext. of Nelumbo nucifera Gaertn. (stamen/ovary), methanol ext. of Persicaria tinctoria H. GROSS (flower), methanol ext. of Coptis chinensis (rhizome), methanol ext. and water ext. of Phellaodendron amurense Rupr. (bark) showed inhibition activity of 15.0%~73.5%, 19.5%~63.5%, 81.6%~58.5%, 69.9%~80.5%, and 54.8%~78.3%, respectively, at concentrations of 25, 50, 100, $200{\mu}g/ml$. In the BuChE assay, the extracts of Nelumbo nucifera Gaertn. (stamen/ovary), Persicaria tinctoria H. GROSS (flower), and Coptis chinensis (rhizome) showed inhibitory capacities of 58.9~81.6%, 45.8%~72.4%, and 33.1%~55.4% at concentrations of 25, 50, 100, $200{\mu}g/ml$, respectively. In conclusion, it is suggested that Nelumbo nucifera Gaertn. (stamen/ovary), Persicaria tinctoria H. GROSS, Coptis chinensis (rhizome) and Phellaodendron amurense Rupr. (bark) could be selected as candidate materials for improving or treating Alzheimer's disease on the basis of further study.