• Journal of Life Science
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• v.21 no.10
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• pp.1393-1400
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• 2011

We investigated the mineral content and antioxidant activity of Portulaca oleracea for biological properties. Total mineral content was 6025.80 mg/100 g, and potassium was the highest at 3846.99 mg/100 g. Water and 80% ethanol extract yields were 14.84% and 24.93%, respectively. The contents of phenolic compounds and flavonoids of ethanol extract were 58.16 mg/g and 20.08 mg/g, and were significantly higher than that of its water extract (49.09 mg/g and 14.98 mg/g, respecitvely). Antioxidant activities and nitrite scavenging activity was significantly elevated in a dose-dependent manner, and that of ethanol extract was higher than that of the water extract. ${\alpha}$-Glucosidase inhibition activity of ethanol extract was significantly higher than the water extract as well. We suggest that the biological properties of Portulaca oleracea are due to its mineral and phenolic contents.

• The Korean Journal of Ecology
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• v.4 no.3_4
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• pp.114-123
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• 1981

Diurnal acid fluctuations, stomatal resistance, and morphology and anatomy were investigated in leaves and stems P. oleracea L. growing under the natural environmental condition. A CAM-like pattern of acid fluctuation was exhibited not in leaves of the young purslane but in its stems. Defoliated stems showed a decreased in diurnal changes of total acidity as compared with normal stems. Excised stems stored in continuous darkness exhibited diurnal acid rhythms, and they showed light deacidifications for three days. Kranz-type arrangement was observed in leaves, but not in stems. Micrography of cross sections of stems showed cells with relatively large vaculoles and a few chloroplasts. The number of stomata was 3,275cm-2 in leaves, while the stomata could not be observed in stems. Stomatal resistance was high at night and low in daytime in leaves of the young purslane, and the range of its value was 5~40 sec.$\textrm{cm}^{-1}$. But stomatal resistance in leaves of the water-stressed plant was comparratively high in day time, and its value was 30 sec.$\textrm{cm}^{-1}$. The result of these studies showed the possibility that the stem of P.oleracea L. possesses CAM under certain stressed conditions.

• Horticultural Science & Technology
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• v.17 no.4
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• pp.489-493
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• 1999

This study was conducted to investigate the potentiality of various Korean Sedum species as ornamental plants based on morphological characteristics and to analyze the genetic relationship among the Sedum species. S. kamtschaticum and S. takesimense possessing splendour flowercluster with yellow color could be suggested for garden plant, S. routundifolium having pink flower-clusters with round leaf shape for pot flower or garden plant and S. sarmentosum, S. polystichoides and S. oryzifolium with creeping stem and low plant height for ground cover plant or floral carpet. Eighteen oligonucleotide random primers were used to amplify genomic DNA of Sedum species using polymerase chain reaction (PCR). Ninety five polymorphic bands among 125 different DNA fragments in the range of 224 to 3,675 base pairs were obtained from RAPD analysis. Similarity matrix of RAPD profiles was generated by coefficient value of variation, and the data were subjected to be cluster analysis. Fifteen lines of Sedum species analyzed were classified into 3 groups with the similarity coefficient value of 0.418, and 12 groups with the value of 0.328. RAPD results showed similar trends as the morphological characteristics of the plants.

• Korean Journal of Weed Science
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• v.4 no.1
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• pp.4-10
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• 1984

This experiment was conducted to determine the change in weed flora with season and cultivated crop and land. There are 44 species in 38 genera and 18 families, consisting of 22 annual, 11 biennial and 9 perennial weeds in uplands in Jeonbug Province. Digitaria sanguinalis Scopol. occurred with the highest frequency of 67.2% and in decreasing order Portulaca oleracea L., Chenopodium album L. and Erigeron canadensis L. followed. About 60% of total sites studied indicated Simpson`s index ranging from 0.20 to 0.50. The Simpson`s index decreased from 0.65 on June 8 to 0.15 on November 10. Dominant weed species were Alopecurus aequalis Sosbol, and Polygonum hydropiper Spach in double cropping paddy field, but D. sanguinalis and P. oleracea were the dominant species in uplands. In reclaimed uplands various weed species including, 4rtemisia asiatica Nakai occurred almost equally. Average Simpson`s index for six crops studied was 0.40 and irrespective of the crops being cultivated P. oleracea and D. sanguinalis were dominant weed species and Y. hydropiper, C. album, Exolus blitum Grenier and E. canadensis were sub-dominant.

• Journal of Life Science
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• v.28 no.4
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• pp.421-428
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• 2018

Postprandial hyperglycemia plays an important role in the development of Type 2 Diabetes and diabetic complications. Controlling postprandial hyperglycemia is the most important factor for reducing the risks of diabetic complications in Type 2 diabetic patients. This study was designed to determine whether Portulaca oleracea L. extract suppresses the activation of carbohydrate-digesting enzymes, and lowers postprandial hyperglycemia in diabetic mice through streptozotocin. P. oleracea was extracted with either 80% ethanol (PEE) or water (PWE), and the extract solutions were concentrated. The ${\alpha}$-glucosidase and ${\alpha}$-amylase inhibition assays were performed using the chromogenic method. Normal mice and STZ-induced diabetic mice were orally treated with PEE, PWE (300 mg/kg of body weight) or acarbose (100 mg/kg of body weight), with soluble starch (2 g/kg of body weight). The ${\alpha}$-glucosidase and ${\alpha}$-amylase inhibitory effectiveness by PEE were markedly more effective than PWE, and both extracts indicated a higher effectiveness than the acarbose (positive control). The rise in postprandial blood glucose due to starch loading was markedly inhibited in the PEE group when compared to the control group in diabetic and normal mice. Furthermore, the area under the concentration-time curve values were markedly declined by the PEE injection in the diabetic group when compared to that exerted for the control group. These results demonstrate that P. oleracea extracts lower postprandial hyperglycemia by inhibiting carbohydrate-digesting enzymes, and that the ethanol extract is more efficacious than the water extract.

• KSBB Journal
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• v.24 no.4
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• pp.397-402
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• 2009

The Portulaca oleracea (P. oleracea) is a popular herbal medicine in East Asia that was known to possess detoxification, antifebrile and antifungal effects. In the present study, we examined the biological activities of ethanol extracts of P. oleracea under various conditions with NIH3T3, B16F10, and MCF-7 cell line model systems. Extracts of P. oleracea (0.5 mg/ml) showed inhibition of expression of tyrosinase, but does not suppress either of TYRP-1 or DCT expression on B16F10 cells. Extracts of P. oleracea (2 mg/ml) showed anti-inflammatory effects on TNF-$\alpha$-stimulated NIH3T3/$NF{\kappa}B$-Luc cells and increase of the synthesis of collagen on NIH3T3 (wild type) cells. These results suggest that extracts of P. oleracea could be used as a functional biomaterial in developing a skin whitening agent and having the anti-inflammatory, anti-wrinkle, and anti-aging activities.

• Korean Journal of Environmental Biology
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• v.36 no.4
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• pp.672-679
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• 2018

This study was conducted to predict the potential distribution and risk of invasive alien plant, Amaranthus patulus, in an agricultural area of South Korea. We collected 254 presence localities of A. patulus using field survey and literature search and stimulated the potential distribution area of A. patulus using maximum entropy modeling (MaxEnt) with six climatic variables. Two different kinds of agricultural risk index, raster risk index and regional risk index, were estimated. The 'raster risk index' was calculated by multiplying the potential distribution by the field area in $1{\times}1km$ and 'regional risk index' was calculated by multiplying the potential distribution by field area proportion in the total field of South Korea. The predicted potential distribution of A. patulus was almost matched with actual presence data. The annual mean temperature had the highest contribution for distribution modeling of A. patulus. Area under curve (AUC) value of the model was 0.711. The highest regions were Gwangju for potential distribution, Jeju for 'raster risk index' and Gyeongbuk for 'regional risk index'. This different ranks among the index showed the importance about the development of various risk index for evaluating invasive plant risk.

• Journal of the Korean Society of Food Science and Nutrition
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• v.46 no.5
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• pp.592-599
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• 2017

This study examined the nutritional compositions of seven raw and blanched green vegetables: Amaranthus mangostanus L. (AM), Aster scaber Thunberg, Taraxacum platycarpum H. Dahlstedt (TP), Oenanthe javanica (Blume) DC, Allium tuberosum Rottler, Ligularia fischeri (Ledeb.) Turcz (LF), and Euonymus alatus (Thunb.) Siebold (EA). Proximate compositions (moisture, protein, ash, dietary fiber, and fat), minerals (calcium, phosphorus, iron, potassium, sodium, and magnesium), and vitamins (riboflavin and vitamin C) were analyzed in the study. In this study, moisture contents of raw and blanched green vegetables were 71.28~92.68 g/100 g and 76.90~92.09 g/100 g, respectively. The protein and fat contents of raw LF (33.38 g/100 g and 4.50 g/100 g dry weight basis, respectively) were higher than those of other cultivars. Ash contents of AM were significantly higher than those of their respective raw samples. Potassium, magnesium, calcium, and sodium contents of AM were 7,710.63 mg/100 g, 1,786.67 mg/100 g, 1,534.44 mg/100 g, and 743.18 mg/100 g, respectively. In the case of raw green vegetables, iron content of TP was 55.23 mg/100 g, which was the highest value among tested green vegetables. Total dietary fiber content of EA was 59.75 g/100 g, which was the highest value. Riboflavin content was highest in the raw and blanched LF (3.10 mg/100 g and 3.05 mg/100 g, respectively). Vitamin C contents of raw and blanched EA were 468.28 mg/100 g and 471.42 mg/100 g, respectively, which were higher than the other values. There were differences in nutritional ingredients according to different types of green vegetables. Therefore, it is advisable to evenly ingest various green vegetables.

• Landscaping Tree
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• s.100
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• pp.18-19
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• 2007

• Korean Journal of Environment and Ecology
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• v.13 no.1
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• pp.1-16
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• 1999

1997년 4월부터 1998년 4월까지 경상북도 내연산 일대의 관속식물상 조사를 실시한 결과, 관속식물은 100과, 350속, 538속, 1아종, 92변종, 10품종, 1교잡종 총 642종류(texa)를 확인하였으며, 이 중 211종류는 금번조사에서 새롭게 추가하였다. 특히 고란초, 부들, 창포, 꽃창포, 노랑무늬붓꽃, 산작약, 둥근잎꿩의 비름, 꿩의 바람꽃, 연잎꿩의다리, 참좁쌀풀 등의 희귀 및 멸종위기 식물을 확증표본과 함께 보고함으로써 본 지역 식물상 조사에 큰 의의가 있다고 판단된다. 본 조사에서 확인한 희귀 및 멸종위기 식물은 총 29종류로서, 환경부 법정보호식물이 3종류, 환경부에서 실시하고 있는 전국자연환경조사에서 제시한 특정식물종 중 정밀생태종은 27종류, 그리고 산림청 희귀 및 멸종위기 식물은 15종류로 나타났으며, 둥근잎꿔의 비름, 망개나무, 노랑무늬붓꽃 등의 분포 등에 대해 논하였다.