• Journal of the Korean Society of Clothing and Textiles
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• v.48 no.6
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• pp.1302-1319
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• 2024

This study was performed to suggest a novel method of sustainably dyeing textiles with biofunctions for skin health by using natural seabuckthorn leaf extract. Mongolian seabuckthorn leaves were extracted in hot water to create a solid dye powder to be characterized by UV/Vis and FT-IR, and its biological activities were examined. A silk woven fabric was dyed with the seabuckthorn leaf extract under a variety of conditions to identify optimum dyeing conditions along with color fastness. To assess the skin-friendly functions of the dyed fabric, its UV-protective properties and antimicrobial activities were investigated quantitatively. As a result, the fabric showed maximum dye uptake (K/S) under the conditions of 80 ℃ and 60 min, which was improved under acidic conditions. The dyeing fastness mostly showed good and excellent grades in perspiration, rubbing, and dry cleaning, while it showed a fair grade in fastness to light. The silk dyed at 30% or higher concentrations showed superior UV-protective properties and provided excellent antimicrobial efficacy (99.9% bacterial reduction rate) against both S. aureus and K. pneumoniae. These results could be utilized in designing biofunctional textiles by natural dyeing with seabuckthorn leaf extract.

• Journal of the Korean Society of Food Science and Nutrition
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• v.39 no.7
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• pp.975-979
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• 2010

Biological activities of different parts (stems, leaves, roots, fruits) and solvents (water, ethanol) of seabuckthorn (Hippophae rhamnoides L.) grown in Korea were tested as follows. In the experiment of inhibiting $\alpha$-glucosidase activity, ethanol extract of Hippophae rhamnoides L. stem showed the highest inhibitory activity by 93% and the next highest was the ethanol extract of its leaf by 88.7%. In the case of these two extracts, the effect of inhibiting $\alpha$-glucosidase activity was extraordinarily great when comparing with control group, acarbose. In the experiment of inhibiting $\alpha$-amylase activity, water extract of leaf showed the highest result by 54.7%, among all extracts. Regarding anticancer effect for HT-29 cell and DU-145 cell, water extract of root showed 47.1% and 32.3% activities, respectively. The experiment on antibacterial activity showed that the ethanol extract from the leaf inhibitory activity of Clostridium butyricum, Proteus mirabilis, and Shigella flexneri which are the several food borne pathogenic strains. In future research, materials for biological activity appear isolated and purified and research should continue.

• Journal of the Korean Society of Food Science and Nutrition
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• v.39 no.7
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• pp.980-985
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• 2010

The objective of this study was to isolate and identify anti-inflammatory chemicals in Hippophae rhamnoides L. which was grown in Chuncheon, Korea. Treatment of ethanol extracts from stems, leaves, roots, and fruits to RAW 264.7 cells reduced amounts of nitrite by 56.0, 31.9, 49.1, and 18.9% respectively, compared to only lipopolysaccharide (LPS) treatment which is well-known as a inflammation-inducing agent. The stems were extracted with hexane, dichloromethane, ethyl acetate, butanol, and water and their nitrite contents in RAW 264.7 cells were measured. The dichloromethane extracts showed the highest inflammatory activity, exhibiting 80% reduction of the nitrite content at 1 mg/mL treatment. Activity-directed fractionation of dichloromethane extracts led to the identification of $\beta$-sitosterol as the anti-inflammatory chemical. 0.1 mg/mL treatment of $\beta$-sitosterol inhibited strongly the production of nitrite by 65%, compared to only LPS treatment. These results suggest that stem of H. rhamnoides L. may be useful for inflammation treatment.