• Preventive Nutrition and Food Science
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• 제11권2호
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• pp.100-104
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• 2006

The in vitro antimicrobial and antioxidant activities of the essential oil and methanol extracts of Ledum palustre L. were investigated. Using GC-MS analysis, we identified 37 compounds in the essential oil, constituting 87.58% of the total oil. There are several monoterpenes, of which sabinene is the major compound ($16{\sim}17%$). There are several oxygenated monoterpenes of which terpinen-4-ol(7.6%) and myrtenal (3.5%) are the main constituents. $\beta$-Selinene, a-selinene, $\gamma$-elemene, a-caryophyllene are the main sesquiterpenes ($2{\sim}6%$ range). The oil strongly reduced the diphenylpicrylhydrazyl radical ($IC_{50}=1.56{\mu}g/mL$) formation and exhibited a hydroxyl radical scavenging effect in the $Fe^{3+}-EDTA-H_2O_2$ deoxyribose system ($IC_{50}=2.7{\mu}g/mL$), and also inhibited the nonenzymatic lipid peroxidation of rat liver homogenate ($IC_{50}=13.5{\mu}g/mL$). The polar phase of the extract showed antioxidant activity. The oil showed antimicrobial activity against Streptococcus pneumoniae, Clostridium perfringens, Candida albicans, Mycobacterium smegmatis, Acinetobacter lwoffii and Candida krusei while the water-insoluble parts of the methanolic extracts exhibited slight or no activity. This study confirms that the essential oil of Ledum palustre L. possesses antioxidant and low antimicrobial properties in vitro.

• 한국식품저장유통학회지
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• 제24권7호
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• pp.1025-1033
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• 2017

본 연구에서는 백산차추출물의 항산화 활성을 알아보기 위해 추출방법을 달리한 4가지 추출물인 열수추출물(LPW), 고온가압추출물(LPA), 초음파추출물(LPU), 70% 에탄올 추출물추출(LPE)과 LPE에 대한 4가지 용매 층 분획물인 n-hexane 층(LPE/H), ethyl acetate 층(LPE/E), n-butanol 층(LPE/B), water 층(LPE/W) 분획물의 DPPH와 ABTS 라디칼 소거 활성을 측정하였다. 또한 백산차 추출물의 항염활성을 알아보기 위해 LPS로 자극된 Raw 264.7 대식세포에서 LPE와 LPE/H, LPE/E, LPE/B, LPE/W의 NO, $PGE_2$, TNF-${\alpha}$, IL-$1{\beta}$, IL-6의 생성 저해 활성을 측정하였다. 그 결과, DPPH와 ABTS 라디칼 소거 활성에서 LPE가 $1,000{\mu}g/mL$의 농도에서 각각 82.3%와 99.8%의 소거 활성을 나타내었으며, LPE/E의 경우 $1,000{\mu}g/mL$의 농도에서 각각 91.8%와 99.6%의 높은 소거 활성을 나타내었다. 항염 활성 확인을 위하여 먼저 MTT assay를 수행하였으며 $25{\mu}g/mL$ 농도에서 LPE와 LPE/E 모두 90% 이상의 세포 생존율이 확인되었다. NO와 $PGE_2$의 생성 저해 활성을 분석한 결과, LPE와 LPE/E에서 높은 NO와 $PGE_2$ 저해 활성을 확인 하였다. LPE는 $25{\mu}g/mL$의 농도에서 각각 50%와 70%의 저해 활성을 나타내었고 LPE/E는 같은 농도에서 각각 57%와 73%의 저해 활성을 나타내었다. 마지막으로 TNF-${\alpha}$, IL-$1{\beta}$, IL-6의 생성 저해 활성을 측정한 결과 LPE 및 LPE/E의 농도의존적인 저해 활성을 확인 하였으며 LPE가 $25{\mu}g/mL$의 농도에서 각각 24%, 47%, 40%의 저해 활성을 나타내었다. 특히 LPE/E는 같은 농도에서 각각 51%, 57%, 62%의 높은 저해활성을 보였다. 이러한 결과들로부터 $1,000{\mu}g/mL$ 농도의 LPE 및 LPE/E는 비타민C와 유사한 DPPH 및 ABTS 라디칼 소거능을 가지며 비교적 낮은 농도인, $25{\mu}g/mL$ 농도에서도 높은 항염증 활성을 가지고 있는 것으로 결론을 내릴 수 있다. 따라서 추후 항노화, 항균, 미백 활성 등에 대한 더 많은 연구 진행이 이루어진다면 백산차추출물은 염증성 질환의 예방 및 치료와 기능성 식품, 화장품 분야 등에서 효과적인 소재로 활용될 수 있을 것으로 사료된다.

• 한국자원식물학회:학술대회논문집
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• 한국자원식물학회 2023년도 임시총회 및 춘계학술대회
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• pp.23-23
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• 2023

The Hairy labrador tea (Ledum palustre L. var. diversipilosum Nakai) is a evergreen small shrub, belonging to the Ericaceae and mainly distributed along the alpine areas of Hamgyeong-do in North Korea. Through seed physiological research on North Korean plants, we intend to obtain basic data for the development of mass propagation methods and use them for vegetation restoration. The internal and external morphological characters of the seed were observed using scanning electron microscopy or stereoscopy, and full seeds were selected through X-ray test. Seeds were cultured on a growth condition at 15/6℃ and 25/15℃ to examine the germination response according to temperature, and the number of germinated individuals was examined every 24 hours to calculate germination percentage and mean germination time. Low-temperature treatment (4℃) and hormone treatment (GA3) were performed to investigate the effect of dormancy breaking, and analysis of variance (ANOVA) was performed on the experimental results using SAS 9.4. The seeds of the Hairy labrador tea were elliptical-narrow in shape, and the epidermal cell wall pattern was reticulated. The final germination rate (FGP) was the highest at 58.9% under the condition of low temperature treatment at 25/15℃. The average number of days to germination (MGT) was the highest at 25.1 days without treatment at 15/6℃, and the average of the last germination days was confirmed to be about 13 days. As a result of low temperature treatment, it was confirmed that the final germination rate (FGP) increased by 43.3%. The significance of the final germination rate (FGP) was verified according to the pretreatment at 25/15℃.