• 한국식품과학회지
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• 제48권6호
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• pp.542-547
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• 2016

The thermal properties of ramie leaf ${\beta}$-amylase (RBA) were examined to develop a novel process for enzyme purification. The thermostability of RBA extract prepared from ramie leaf powder was examined at various temperatures. RBA activity decreased slightly, whereas other carbohydrate-active enzymes, such as $\small{D}$-enzyme, were rapidly inactivated during 30 min incubation at $60^{\circ}C$. When the heat-treated extract was incubated with various substrates, maltose was produced exclusively as the major product, whereas the untreated crude extract produced maltose and other maltooligosaccharides. In sodium dodecyl sulfate-polyacrylamide gel electrophoresis analysis, fewer protein bands were observed for the heat-treated extract than the untreated extract, indicating that the thermostable RBA was partially purified and other thermolabile enzymes were eliminated. Thus, the treatment of the RBA extract at $60^{\circ}C$ for 30 min resulted in 5.4-fold purification with a recovery yield of 90%.

• 한국생활과학회지
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• 제7권2호
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• pp.75-80
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• 1998

In this paper, deying properties and colorfastness of ramie, flax, and cotton fabrics for direct dyes were compared. When dyed in a same dyeing bath ratio, in case of green dyes, colorfastness to light was similar for three fabrics but in case of red dyes, cotton had a lower level. For colorfastness to laundering, three fabrics were similar and there were no consistent differences. The degree of stain about white fabric cotton was highest in case of red dyes. The degree of stain about white fabric wool showed the high resistance of stain and little stain was seen. This result represented that the used dyes were proper direct dyes for cellulosic fibers. For the difference of shade, the cotton was cosistently brighter and the shade of ramie was darker than of cotton and flax. This might mean that optical effects arouse from the comparatively large cross-sectional size of the ramie fiber and its highly ordered structure.

• 한국잠사곤충학회지
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• 제41권3호
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• pp.222-227
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• 1999

The weavability and bleaching of ramie/silk mixture fabrics were examined. When silk fiber was used as warp or weft in the mixture fabrics, the weaving properties became higher than that of ramile fabrics. Especially, the highest weavabiliy of mixture fabrics was obtained when used as warp silk fiber. The whiteness of ramie and tussah fiber treated with hydrogen peroxide, bleaching agent. was increased up to about 80% without significant changes of tenacity and elongation. As the increase of bleaching agent and treatment time, the whiteness of mixture fabrics was increased and the yellowness was decreased. Also, as the whiteness of mixture fabrics increased, the drape stiffness in warp direction was decreased but crease recovery was increased.

• 한국감성과학회:학술대회논문집
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• 한국감성과학회 2011년도 추계학술대회
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• pp.90-91
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• 2011

• Plant Resources
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• 제5권3호
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• pp.206-209
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• 2002

This study was performed to investigate the effect of Mentha arvensis Herba extract on the treatment of chromaticity and colorfastness. Mentha arvensis Herba has been used as a Korean medicine. It is effective in headache and stress. It is also good as a aphtha and in treating cold. In the long history of Korea, dyeing has been applied for a means representing the grace of natural and inner esthetic consciousness of man. Vegetable dyes give us such great benefits, diversified color, but no pollution. And ramie fabric has distinctive features such as beautiful brilliance, elegance, and strong durability. So, it is regarded as a special product of Korea traditionally. These studies were carried out to treat with acetate iron, dichloride copper and alum with a mordant to ramie fabric. The ramie fabric was died with Mentha arvensis Herba extract. The results of experiment showed as follows: First, the chromophoric degree was the highest in acetate iron but not distinction in another mordants. Second, the light colorfastness was the highest in non treated and dichloride copper, but alum was the lowest. Third, the discoloration was alum and dichloride copper showed first grade in washing colorfastness. Abrasion colorfastness was not significant in this test. According the previous results, Mentha arvensis Herba has an efficiency in removing aphtha and in treating cold. So it is considered that Mentha arvensis Herba can be applied effectively to headache and stress.

• 한국의류산업학회지
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• 제13권3호
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• pp.438-444
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• 2011

Bamboo leaves, as natural dye provide unartificial fresh green, are known for expert property at anti-bacterial, anti-aging, anti-oxidation, skin whitening, moisturizing, peeling of horny, deodorizing and some skin disease like as eczema and inflammation without any allergic response. Also, It is quite common to obtain bamboo leaves from our surrounding but most of them were not in use. On purpose of development the way of recycle with common material to dye, bamboo leaves were used to dye on ramie fiber which is valuable for both of apparel and industrial field and investigated their dyeing property. Using extract from bamboo leaves, dyeing property was examined with dyeability, colorimetric property, light fastness and wash fastness under different conditions by extract density, dyeing time, dyeing method and mordants. As results, dyeing was generally colored in yellowish, K/S Value was shown more higher on hemp fiber than ramie. The most optimum dyeing condition was investigated on pre-mordant treatment, dyeing temperature $60^{\circ}C$, dyeing time 30min and extract density 400%. On the treatment with mordant(Al, Fe, Cu), dyebility on both of hemp and ramie fiber were increased by mordant. Especially with Copper(Cu) as mordant, dyebility was highly increased than any other mordants and dyeings showed in deep color. Also on the fastness test which is the most important to natural dyeing, wash-fastness showed good performance with 4-5 grade but light-fastness was above 4 grade on both of hemp and ramie fiber, lower than wash-fastness overall.

• 복식문화연구
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• 제31권2호
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• pp.161-172
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• 2023

In this study, natural dyeing using Polygonum tinctoria was performed with linen, ramie, and hemp, which are biodegradable cellulose fibers, considering environmental aspects. In particular, the impacts of alkali NaOH and reducing agent Na₂S₂O₄ were examined, and the possibilities of minimizing the use and reusing the dye were explored. The surface dye concentrations were found to be in the following order: hemp>linen>ramie. With the increase in all additives, the L^* value decreased, and the ⊿E and K/S values increased gradually. When Na₂S₂O₄ was 1g/L, the surface color of the dye appeared uniformly from the NaOH concentration of 0.4g/L (pH 10.84). When NaOH was 0.4g/L, the K/S values of linen and ramie increased rapidly after 0.4g/L of Na₂S₂O₄, and hemp maintained a stable color from 0.6g/L of Na₂S₂O₄. With the increase in the dye concentration from 1 to 6g/L, all the fibers were dyed uniformly. The K/S value increased or higher doubled upon repeated dyeing six times for 5 min than when dyed only once for 30 min. Therefore, the linen, ramie, and hemp fibers dyed repeatedly exhibited good washing, rubbing, and colorfastness to perspiration, which was rated between 4 and 4-5, and that to light was rated as 5. Moreover, no discoloration due to sunlight was observed. Finally, linen exhibited a bacterial reduction of 99.9%, thereby indicating its excellent antibacterial property.

• 한국의류학회지
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• 제24권3호
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• pp.411-411
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• 2000

• 한국식품영양과학회지
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• 제43권5호
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• pp.682-689
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• 2014

본 연구는 모시잎의 건조방법에 따른 항산화 및 암세포 증식억제효과를 비교 분석하였다. 80% 에탄올로 추출한 열풍건조 및 동결건조 모시잎의 총 폴리페놀 함량은 건조방법에 따른 유의적 차이를 보이지 않았다. 반면 총 플라보노이드 함량은 열풍건조 모시잎이 동결건조 모시잎에 비하여 유의하게 높게 나타났다. 1,000 ppm에서 열풍건조 및 동결건조 모시잎의 DPPH 라디칼 소거능은 각각 77.74%와 77.29%의 비슷한 라디칼 소거능을 보였으며, Rancimat으로 측정한 열풍건조 및 동결건조 모시잎의 항산화지수는 각각 1.38과 1.32로 BHT, BHA 및 비타민 C에 비해서는 낮았으나 시료를 미첨가한 음성대조군보다는 높은 항산화력을 보였다. 위암(AGS), 간암(Hep G2) 및 폐암(A549) 세포에 대한 모시잎 에탄올 추출물의 암세포 증식 억제효과를 알아본 결과, 열풍건조 및 동결건조 모시잎 에탄올 추출물의 농도가 증가할수록 암세포의 증식 억제 활성은 농도 의존적으로 증가되었다. 건조방법에 따른 항암활성은 비슷한 경향이었으며 가장 높은 농도인 $800{\mu}g/mL$에서 80% 이상의 간암 및 폐암세포의 증식 억제 활성을 보였고, 위암세포에서는 75%이상의 증식 억제 활성을 보였다. 이상의 결과 열풍건조 및 동결건조 모시잎 에탄올 추출물은 in vitro에서 항산화효과와 암세포의 증식 억제효과를 보였고, 건조방법에 따른 모시잎 에탄올 추출물의 항산화 활성 및 암세포 증식 억제 활성은 비슷한 경향으로 나타났다.

• 한국자원식물학회지
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• 제17권3호
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• pp.297-303
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• 2004

꼭두서니에서 추출한 염료를 이용해 몇 가지 조건에서 견직물을 천연염색 해 봄으로써 견직물에 대한 꼭두서니의 염색성과 염료로서의 이용성을 조사하였다. 꼭두서니 추출물로 모시 섬유를 염색 한 결과 표면색은 YR계열로 나타났으나 매염제에 따라 다소 차이가 있어 FeSO$_4$, SnC1$_4$, tartaric acid에서 는 Y계열로, 동백, 콩대재에서는 R계열로 나타났다. 염색온도에 따른 모시섬유의 표면색과 염착농도는 염색온도가 높을수록 a값이 증가한 반면에 b값은 감소되었고, L값은 낮아졌다. 염착농도는 7$0^{\circ}C$ , 9$0^{\circ}C$, 6$0^{\circ}C$순으로 높았다. 염액의 pH에 따른 표면색은 pH 4와 9에서는 순 Y계열을 나타냈으며, 염착농도는 산이 강할수록 K/S값이 다소 높게 나타났다. 염액의 농도에 따른 표면색은 농도에 관계없이 기본적으로 YR계 열로 발색 되었으며 , 염착농도는 염액의 농도가 높을 수록 증가하는 경향을 나타냈다. 염 색시간에 따른 표면색과 염착농도는 10-120분간에 큰 차이가 없어 10분간으로도 충분한 것으로 나타났다.