• Journal of Korea Technical Association of The Pulp and Paper Industry
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• v.40 no.1
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• pp.23-28
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• 2008

Functional hanji was manufactured using the bast fiber of Broussonetia kazinoki and various inorganic compounds such as kaolin, talc, elvan, and ocher, and the physical and optical properties were investigated. The residual percentages of kaolin, talc, elvan and ocher in the functional hanji were above 50%. The density of the hanji increased with the increase of the content of inorganic compounds. The hanji manufactured using ocher showed the highest density. The breaking length and burst factor decreased with the increase of inorganic materials, indicating that physical properties of hanji were not improved by adding inorganic materials. The emission rates of far-infrared radiation increased in the hanji manufactured using inorganic materials. The higher emission rates were observed in the hanji with elvan or ocher. Addition of inorganic compounds to hanji showed the flame retardative effect. The colorfastness to light of the hanji with elvan or ocher was the degree of 4, which explained by the characteristic color of the inorganics.

• Applied Microscopy
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• v.46 no.4
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• pp.201-205
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• 2016

Functional surfaces in nature have been continuously observed because of their ability to adapt to the environment. To this end, methods such as scanning electron microscopy (SEM) have been widely used, and their wetting functions have been characterized via environmental SEM. We investigated the superhydrophobic hairy leaves of Pelargonium tomentosum, i.e., peppermint-scented geranium. Their surface features and wettability were studied at multiple-scales, i.e., macro-, micro-, and sub-micro scales. The surfaces of the investigated leaves showed superhydrophobicity at the macro-, and micro-scales. The wetting or condensing behavior was studied for molecule-size water vapors, which easily adhered to the hairy surface owing to their significantly lower size in comparison to that of the surface.

• Korean Journal of Soil Science and Fertilizer
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• v.20 no.4
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• pp.341-349
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• 1987

Fulvic acids extracted from seven plant materials were tested. The IR spectra and the data obtained from chemical analyses in terms of oxygen-containing functional groups complemented one another. Selected samples covered straws of grain crops (rice, barley, wheat and rye), hay of wild grass, and leaves of trees (deciduous and coniferous). 1. No significant variation in IR spectra of fulvic acids was observed among samples taken from different plant residues and at different stages of humification. 2. Oxygen-containing functional goups, such as carboxyls, phenolics, alcoholics, carbonyls, and quinones were identified on IR spectra and confirmed by chemical analyses. 3. The acidity of fulvic acids was directly related with the content of carboxyl groups. 4. Alcoholic hydroxyl groups predominated over phenolic hydroxyls. 5. The major part of fulvic acid structure appeared to be strongly aliphatic in many respects of chemical characteristics.

• Journal of Plant Biotechnology
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• v.43 no.2
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• pp.248-254
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• 2016

The purpose of this study was to investigate biological activities of Brassica rapa (Turnip) plant callus extracts of Ganghwa-gun of Incheon city using water, ultrasonic wave and ethanol extractions to develop functional materials. DPPH radical scavenging activities of the callus extracts were increased in a concentration-dependent manner, as compared with control. The astringent effects of the ethanol extracts were higher, as compared to water and ultrasonic extracts. In the collagen synthesis assay, the ethanol extract showed significant anti-wrinkle effects of 59% and 78% at a concentration of 5 ppm and 10 ppm, respectively. These results suggested that water, ultrasonic wave and ethanol extracts of turnip plant calluses are natural antioxidant sources. Especially, the ethanol extract can be regarded as a functional, natural cosmetic material with astringent and anti-wrinkle effects.

• Journal of Korea Technical Association of The Pulp and Paper Industry
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• v.45 no.6
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• pp.64-71
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• 2013

The biodegradable mulching paper could be applied for the environmental friendly agriculture as an alternative to the current vinyl mulching. In order to increase the usability of the mulching paper, the effects of the addition of various inorganic materials on the functionality of the mulching paper were evaluated in terms of practical benefits. The blend of carbonized rice husk powder and perlite resulted in the higher value in the air permeability of the mulching paper, which would be important for the health of plant root. The heat conservative of the mulching paper could be improved by adding the bottom ash or the fly ash because of the pore structure of the ashes. The pH of acidic soil could be neutralized by using the mulching paper containing paper-mill sludge ash or fly ash. The various results showed the addition of the inorganic materials could improve the functional properties of the mulching paper.

• Korean Journal of Plant Resources
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• v.22 no.1
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• pp.71-77
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• 2009

Antioxidative activity and ${\alpha}$-amylase inhibitory activity were investigated in the methanol extracts of 289 species of angiosperm plants native to Jeju Island in order to select the plant species containing bioactive materials for functional foods or medicines. The antioxidative activity, estimated by the DPPH radical scavenging capacity, was high in the galla of Rhus chinensis, the fruit of Platycarya strobilacea, and the stem of Cedrela sinensis. Particularly, the antioxidative activity of Rhus chinensis galla (94.2${\pm}$0.8%) was very high even though compared to those of BHA (61.7${\pm}$0.6%) and ascorbic acid (53.6${\pm}$0.7%). The ${\alpha}$-amylase inhibitory activity was 80% or above in 9 species including Cornus macrophylla (stem, leaf), Distylium racemosum (leaf) and Vaccinium oldhami (leaf). These results suggest that these plants could be potentially utilizable to develop bioactive materials for functional foods or medicines.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2019.04a
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• pp.118-118
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• 2019

Abeliophyllum distichum Nakai belonging to Oleaceae is only species in Korean endemic genus, Abeliophyllum. Abeliophyllum distichum (AD) is divided into various types according to flower shape and color. AD is known to have various colors such as white, pink, and ivory. Recently, light yellow flowers have been registered as new varieties (Okhwang 1ho). To date, various ecological and morphological studies on AD have been carried out, but no studies have been made on the phytochemicals and activities according to various traits. In this study, we analyzed the phytochemicals and antioxidative activities of from four kinds of flowers (white, pink, ivory, light yellow) in full bloom. The contents of phytochemicals such as chlorogenic acid, Hirsutrin, Rutin, Acteoside and Isoacteoside were analyzed by HPLC. Antioxidant activity was evaluated by DPPH, ABTS. As a result, the content of each substance varied according to the flower color. These results will provide basic data for evaluating the usefulness of genetic resources in Korea and developing new functional materials in preparation for the Nagoya Protocol.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2018.04a
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• pp.14-14
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• 2018

This Camptotheca acuminata Decne. (CA), belonging to Nyssaceae, is a deciduous tree. and has been used as Traditional Chinese medicine since ancient times. The CA produces camptothecin a natural indole alkaloid, and reported to have anti-cancer effects. But the studies on biological activities of CA leaves are insufficient. Therefore, this study confirmed various biological activities such as antioxidant, antidiabetic, anticancer, antiinflammatory and metabolism analysis by HPLC-MS/MS of CA leaves. The $RC_{50}$ values of DPPH radical scavenging activity of ethyl acetate fraction, n-Butanol fraction, methanol extraction, water fraction and n-Hexane fraction were $12.23{\pm}0.01$, $15.93{\pm}0.42$, $55.12{\pm}0.45$, $56.29{\pm}4.15$ and $427.29{\pm}6.13ug/mL$, respectively. The $IC_{50}$ values of ${\alpha}$-glucosidase inhibitory activity of ethyl acetate fraction, n-Butanol fraction, methanol extraction, n-Hexane fraction and water fraction were $24.29{\pm}0.14$, $47.86{\pm}0.45$, $54.23{\pm}1.21$ $466.76{\pm}2.21$ and $623.91{\pm}9.67ug/mL$, respectively. The nitric oxide release activity of n-Hexane fraction, methanol extraction, ethyl acetate fraction, water fraction and n-Butanol fraction were $31.49{\pm}5.74$, $29.79{\pm}0.71$, $26.89{\pm}0.71$, $8.24{\pm}5.83$ and $7.75{\pm}4.08%$ at 25 ug/mL, respectively. The anti-cancer activity of n-Hexane fraction, methanol extraction, ethyl acetate fraction, water fraction and n-Butanol fraction were $31.49{\pm}5.74$, $29.79{\pm}0.71$, $26.89{\pm}0.71$, $8.24{\pm}5.83$ and $7.75{\pm}4.08%$ at 25 ug/mL, respectively. The ethyl acetate fraction activities showed higher biological activities than other fractions. Thus, Additional studies were conducted using ethyl acetate fraction. Metabolite analysis was performed using a LCMS-8040 triple quadrupole mass spectrometer. As a result, Five compounds (1-5) were identified in the ethyl acetate fraction of the CA leave. The identification of these compounds was generated by the analysis of fragmentation methods of the negative and positive ion modes. Five compounds were identified as gallic acid (1), chlorogenic acid (2), isoquercetin (3), astragalin (4) and camptothecin (5). These results suggest that the CA leave can be used for functional materials.

• Microbiology and Biotechnology Letters
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• v.52 no.1
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• pp.65-75
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• 2024

The growing demand for functional cosmetics, driven by modern individuals' quest for healthy and aesthetically pleasing skin, is being challenged by reports of side effects and toxicity associated with these products. This underscores the importance of exploring natural plant-based materials for functional cosmetics. This research focuses on the assessment of antioxidant and whitening properties of mixed extracts from Ipomoea nil, Arctostaphylos uva-ursi, and Angelica gigas Nakai, all of which have proven pharmacological benefits. The study evaluated the extracts' total polyphenol and flavonoid contents, ABTS and DPPH radical scavenging activities, SOD-like activity, and xanthine oxidase inhibition to determine their antioxidant capabilities. Moreover, the whitening potential was investigated through tyrosinase activity and melanin production assays, alongside a cytotoxicity evaluation via a cell viability test. The findings revealed that the extracts, IAA-1 to IAA-4, demonstrated both antioxidative and whitening capabilities without exhibiting cytotoxic effects. Notably, the extract IAA-4, processed through ultrasonic and ultrahigh pressure extraction, exhibited superior effectiveness. These results indicate that the cavitation formed during ultrasonic irradiation effectively destroys the plant cell wall by creating high pressure, and as a result, it is judged that useful components are easily extracted. As a result of the study, it was confirmed that the IAA-4 extract could be applied as a material for functional cosmetics.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2003.10a
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• pp.30-36
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• 2003

1. After 8 weeks of storage, TBARS, VBN and POV values of sausages treated with 0.3% EEP, 0.4% DREEP, 0.2% PS and 0.3% WEP at 4$^{\circ}C$, respectively, lower than that of the control samples. 2. The antioxidative effects of boiled WEP was stronger than room temperature WEP. 3. The results show that materials with low boiling point contain strong antioxidant compounds. 4. EEP, WEP and DREEP can serve as good chemical preservatives of pook meat products and can promote human health because they are naturally produced.