• Journal of the Korean Society of Food Science and Nutrition
• /
• v.28 no.6
• /
• pp.1201-1207
• /
• 1999

To utilize the leaves of broccoli, the shape of which was similar with that of kale leaves, as a vegetable juice, the extracts from two types of vegetable leaves were subjected to the analyses of proximate com ponents, volatile sulfur compounds, vitamin C and minerals. The sensory evaluation of the juices, prepared from kale and broccoli leaves, were performed by duo trio test and scoring test. Among eight varieties of broccoli, four varieties('Pilgrim', 'Greenbelt', 'Salinas' and 'Shasta')were not significantly different from kale(p<0.05), based on the duo trio sensory test. Sulfur and nitrogen compounds present in the dichloromethane extracts of kale and broccoli leaves 'Pilgrim' were identified as 3 butenyl, allyl, butyl and 4 methylsulfinylbutyl isothiocyanate(sulforaphane), 4,5 epithiovalero, 4,5 epithio 3 hydroxyvalero, benzenepropane, 3 hydroxy 4 propene, 4 methylthio butane, 3 hydroxy 3 phenylpropane, 5 methy lsulfinylpentane, 4 methoxyphenyl 3 hydroxypropane nitrile and dimethyl trisulfide by GC/MSD analysis. Proximate components were observed to be relatively similar between kale and broccoli leaves. Vitamin C and sugar content were higher in broccoli leaves(125∼180mg% and 8∼12°Brix) than in kale(101mg% and 7oBrix). In mineral analysis by AA and ICP Mass, 'Pilgrim' showed a higher content of K, Fe, Mn, Zn and Se. In separate experiment, sensory scores of bitter taste and astringent taste were lower and scores of over all taste and over all acceptability, higher in broccoli('1243') juice than those in kale juice.

• Food Science and Preservation
• /
• v.8 no.4
• /
• pp.475-480
• /
• 2001

Yields of bamboo extracts were 1.0∼1.5% in stalks and 3.1∼3.2% (w/w) in leaves. Electron donating ability of extracts from stalks was 62% in Maengjongjuk, 55% in Somdae and 52% in Wangdae, while that of leaf extracts showed very low level. On the contrary, nitrite-scavenging activity was higher in leaf extracts than stalk extracts, and the activity was 63, 57 and 55% in leaf extracts of Maengjongjuk, Wangdae and Somdae, respectively. Antimicrobial activity was examined against 7 major strains which cause food poisoning, and extracts of bamboo stalks showed somewhat activity, while leaf extracts showed merely or no activity according to strains. But all extracts showed relatively strong antimicrobial activity against Staphylococcus aureus and Vibrio parahaemolyticus, and extracts of Somdae stalks and Maengjongjuk leaves showed antimicrobial antimicrobial activity against those strains on 100${\mu}\ell$/disc concentrate.

• Food Science and Preservation
• /
• v.18 no.6
• /
• pp.817-823
• /
• 2011

Angelicae gigas Nakai has been used as a traditional medicine as well as an edible vegetable in South Korea. In this study, the total phenolic and flavonoid content and antioxidants of A. gigas Nakai leaves were examined in vitro via hydroxyl-radical-scavenging activity, reducing power activity, metal chelating assay, and DPPH-free -radical-scavenging assay. Among all the extracts from A. gigas Nakai leaves, the ethanol extract showed the strongest effects in all of the assays. The $EC_{50}$ values for the DPPH-radical-scavenging activities of ethanol, methanol, and water extracts were 31.47, 42.14, and $58.47{\mu}g/mL$, respectively. Among the extracts from A. gigas Kakai leaves, the ethanol extract had the highest levels of total phenolics ($7.84{\pm}1.46$ mg TAN/g) and total flavonoids ($4.23{\pm}0.03$ mg QE/g), which correlated strongly with the individual phenolic-compound (p-hydroxybenzoic acid, vanillin, and trans-ferulic acid) contents. The ethanol extract also showed stronger antioxidant activity than tocopherol in hydroxyl- radical-scavenging activity assay. These results indicate that the ethanol extract of A. gigas Kakai leaves possesses significant antioxidant properties, which suggests its great potential as a functional-food ingredient in the food industry.

• Journal of Applied Biological Chemistry
• /
• v.63 no.4
• /
• pp.407-412
• /
• 2020

A simple and reliable HPLC method was developed to determine pharmacologically standard marker compounds of Ulmus parvifolia leaves. Standard markers were characterized with neochlorogenic acid (trans-5-O-caffeoylquinic acid, 5-CQA) and chlorogenic acid (trans-3-O-caffeoylquinic acid, 3-CQA) using NMR and UPLC-QTof-MS analysis. A method for qualitative/quantitative analysis of the leaves extracts were evaluated including two compounds by using HPLC. The stability test of 30% ethanolic extracts of the leaves sample and standard markers have been evaluated for six months. However, no significant changes in the content of the marker compounds of each extract was observed during the time of investigation.

• The Korean Journal of Food And Nutrition
• /
• v.36 no.2
• /
• pp.114-121
• /
• 2023

The objective of this study is to evaluate the antioxidant components, elastase inhibition activities, and melanin synthesis rates of Korean traditional Actinidia (Actinidia arguta) fruits and leaves depending on the ethanol extraction concentrations. The total polyphenol content was the highest in the 50% ethanol extract of both fruits and leaves, with values of 634.1 mg GAE/100 g and 3,985.2 mg GAE/100 g, respectively. The total flavonoid content was the highest in the fruit 90% extract and leaf 50% extract at 191.9 mg/100 g and 2655.6 mg/100 g, respectively. The vitamin C content was the highest in the 50% extract of leaves at 2990.3 mg/100 g. Elastase inhibition was the highest at 56.9% in the leaf 50% extract at a concentration of 1,000 ㎍/mL. Melanin synthesis inhibition showed the highest melanin synthesis inhibitory effect among the extracts, as the leaf 50% extract showed an inhibitory rate of 65% or more. Therefore, the antioxidant components, elastase inhibition activities, and melanin synthesis inhibitory rate were better in leaves than in fruits. The leaf 50% extract was particularly the best among the extracts. Korean traditional Actinidia leaves can be considered as potential sources for new functional materials.

• The Korean Journal of Ecology
• /
• v.8 no.1
• /
• pp.15-19
• /
• 1985

A number of field surveys have been performed in larch (Larix leptolepsis) forest floor in which any seeding of this species never find ther. In laboratory work, aqueous extracts from leaves, roots and stems of larch were provided and used to bioassay. Among them, germination and seedling growth of selected species were the most inhibitory in leaves extracts. Though germiation percentage of a species showed high compared with control, its dry weight after a given period grown were clearly low. The results due to be considered by allelopathic effect. And syringic acid and p-hydroxybenzoic acid were identified by HPLC from larch leaves. It is assumed that these phenolic acids affect on other species as allelochemicals of larch.

• The Korean Journal of Ecology
• /
• v.12 no.3
• /
• pp.161-170
• /
• 1989

To verify allelopathic effects of Artemisia princeps var. orientalis, a number of laboratory experiments have been performed. Aqueous extracts of leaves, stems and roots of the above species inhibited the seed germination and seedling growth of experimental species, receptor plants. In general, the higher was the concentration of the extracts, the lower was the germination and the growth ratio. Volatile substances released from leaves of the donor plants also inhibited the seed germination and the radicle elongation of receptor plants. Therefore, to find out the inhibitory substances emitted from the wormwood, gas chromatography was employed. As a result of the analysis, 17 KDICical substances were isolated from the leaves and most of them were identified as phenolic compounds.

• Korean Journal of Medicinal Crop Science
• /
• v.14 no.2
• /
• pp.82-86
• /
• 2006

Antioxidant activity of the extract fractions from leaves, stems, roots and flowers of Cirsium pendulum Fisch. was investigated. The results showed the greatest antioxidant activities in leaves by Rancimat, TBA and DPPH methods. Extracts of common thistle plants dose-dependently increased DPPH free radical scavenging activity, The extract from flowers and its hexane fraction showed the strongest antioxidant activity. HPLC analysis showed that BuOH fraction of the leaves had the highest amount of antioxidant chlorogenic and p-coumaric acids at 5.38 and 9.71 mg $100\;g^{-1}$, respectively. It implies that common thistle plants had potent antioxidant activity, and their activities were differently exhibited depending on plant part and solvent fraction.

• International Journal of Industrial Entomology and Biomaterials
• /
• v.35 no.1
• /
• pp.1-6
• /
• 2017

In relation to the global increase trend of obesity population, there is a demand for the development of foods having high functional activity by mass-extracting anti-obesity active substances using mulberry product such as leaf and fruit. Therefore, we evaluated the antiobesity efficacy according to varieties by using the mulberry leaves and fruit extracts. At the same time, high active varieties were selected. For this purpose, the effects of the extracts of the mulberry leaf and fruit on 3T3-L1 adipocyte differentiation were examined. As a result, in the case of mulberry leaves, the lipid accumulation inhibitory rate of 'Cheongolppong' was higher than that of the control at $500{\mu}g/ml$ treatment. And in the case of the extract of mulberry fruit, 'Daesim' showed the highest lipid accumulation inhibitory rate compared with the control at 50 times of diluted extract.

• Journal of the Korean Chemical Society
• /
• v.67 no.2
• /
• pp.150-155
• /
• 2023

Eurya emarginata is an evergreen tree growing in the southern regions of Korea including Jeju Island. In this study, antioxidant and anti-photoaging effects were investigated with the extracts of E. emarginata leaves. As comparative studies with the extract and five solvent fractions, the EtOAc fraction showed the most effective DPPH and ABTS⁺ radical scavenging activities. The EtOAc fraction also inhibited matrix metalloproteinase-1 (MMP-1) production most effectively. Phytochemical study on the EtOAC fraction resulted in the isolation of three compounds; eutigoside C (1), eutigoside B (2) and quercitrin (3). Among the isolates (1-3), quercitrin (3) showed excellent antioxidant activities and inhibitory properties on MMP-1 production. Based on these results, it was suggested that extracts of E. emarginata leaves could be developed as natural anti-photoaging agents in cosmetic formulations.