Abstract: Two alkaloids, oleraceins F and G, were isolated from Portulaca oleracea L, and their structures were determined as methyl (2S)-6-[(β-D-glucopyranosyl)oxy]-2,3-dihydro-5-hydroxy-1-[(2E)-3-(4-hydroxy-3-methoxyphenyl)prop-2-enoyl]-1H-indole-2-carboxylate and methyl (2S)-6-[(β-D-glucopyranosyl)oxy]-2,3-dihydro-5-hydroxy-1-[(2E)-3-(4-hydroxyphenyl)prop-2-enoyl]-1H-indole-2-carboxylate, based on their spectroscopic data Oleraceins F and G exhibited scavenging activity against 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical, with EC50 values of 2100 and 3769 μM, respectively

Abstract: The most important nutrients present in plants are: carbohydrates, such as the starch and free sugars, oils, proteins, minerals, ascorbic acid, and the antioxidant phenols. The Plants Alocacia indica Sch.,Asparagus officinalis DC., Chlorophytum comosum Linn., Cordia myxa Roxb., Eulophia ochreata Lindl., Momordica dioicia Roxb., Portulaca oleracia Linn. and Solanum indicum Linn. are widely wild in many regions of Iran and India. Association of the Official Analytical Chemists and Folin-Ciocalteau micro method are used for nutritional analysis of the plants. Results indicated that Portulaca oleracia Linn. and Asparagus officinalis DC. contain high amounts of proteins, fats and calorie values. These plants are consumpted as vegetables in Iran people diets.

Abstract: A southeastern European isolate of Alternanthera mosaic virus (AltMV-MU) of the genus Potexvirus (family Flexiviridae) was purified from the ornamental plant Portulaca grandiflora. The complete nucleotide sequence (6606 nucleotides) of AltMV-MU genomic RNA was defined. The AltMV-MU genome is different from those of all isolates described earlier and is most closely related to genomes of partly sequenced portulaca isolates AltMV-Po (America) and AltMV-It (Italy). Phylogenetic analysis supports the view that AltMV-MU belongs to a new “portulaca” genotype distinguishable from the “phlox” genotype.

Abstract: The Portulaca oleracea v. sativa (POS) belonging to the family Portulacaceae is a cultivated herb, used traditionally to treat Swellings, muscular pains and toothache (Okwuasaba et a1 1986). Two other species, Portulaca oleracea (PO) and Portulaca grandgora (PG) are also used by healers for similar indications. No formal studies have been made to evaluate the analgesic activity of these plant extracts. The present study was carried out to evaluate POS for its analgesic activity by two well established experimental methods in Wistar rats and albino mice and to compare it with that of PO and PG using diclofenac sodium as reference drug. The analgesic activity was evaluated using the hot-plate method and tail-flick response on albino mice and Wistar rats, respectively. The hot-plate reaction time was taken as the time between placing animals on the hot-plate and licking the fore or hind paws. Tail-flick response was measured as the time taken by the animals to withdraw the tail from the radiant heat source. In both methods the reaction time was measured 10 min before, and 2 ,4 and 6 h after the intraperitoneal adminstration of either a 10% alcoholic extract or diclofenac sodium (4 mg kg-'). The data showed that at the dose of 400 mg kg-', both POS and PG extracts possessed significant analgesic activity which lasted for 6 h. However, the significant analgesic effect followin the extract of PO was observed only during the 4 h of treatment. The analgesic effect of POS and PG at the doses studied was comparable with that of the diclofenac sodium. POS and PG produced similar effects (Table 1). No significant difference was noticed at the two different doses tested. The analgesic responses recorded by the two methods indicated that the PO extract showed positive analgesic response that lasted for 6 h using the tail-flick method only. These results support the traditional use of Portulaca sp. in painful conditions. The results also indicate that more than one experimental model is needed to test the analgesic activity. t f

Abstract: Portulaca (Portulaca oleracea cv.) efficiently removes phenolic pollutants from hydroponic solution. In plant roots, peroxidase (PRX) is thought to be involved in the removal of phenolic pollutants by the cross-linking them to cell wall polysaccharides or proteins at the expense of reduction of hydrogen peroxide (H2O2). In this study, we found that portulaca roots secreted an acidic PRX isozyme that had relatively high H2O2 affinity. We isolated five PRX genes, and the recombinant PRX proteins produced in cultured tobacco cells were partially characterized. Among these genes, PoPRX2 probably encoded the acidic PRX isozyme. PoPRX2 had an extra N-terminal region which has not been reported for other PRX proteins. We found that PoPRX2 oxidized phenolic pollutants, including bisphenol A, octylphenol, nonylphenol, and 17β-estradiol. In addition, we found that the Cys261 residue of PoPRX2 played an important role in the determination of affinity for H2O2 and stability toward H2O2.

Abstract: Portulaca oleracea (family: Portulacacea) is a warm-climate annual, used traditionally for alleviating pain and swelling (Okwuasaba et a1 1987). We observed a reduction in the locomotor activity in mice and rats treated with 10% alcoholic extract of a cultivated variety, P. oleracea v. sativa during the screening for anti-inflammatory and analgesic activity. Therefore, in the present study, we decided to examine the effects of this extract on the locomotor activity, experimental convulsions and nerve-muscle preparation, in an effort to bring out possible effects of this plant on the nervous system. A Columbus activity meter was used to measure the locomotor activity of mice (Magnus-Ellenbroe et a1 1993). Animals were introduced into the individual activity cages after 30 min of administration of either saline (control), 200 or 400 mg kg-' of the extract, intraperitonially (i.p.). Activity during 1-h periods was recorded for 5 consecutive hours after introduction. Pentylenetetrazole was used to induce convulsions in mice (Nwaiwu & Akah 1986). The onset time (s.) of convulsions was recorded 1 h after the intraperitoneal administration of saline (control) or the extract. Rat hemidiaphragm preparation was used to study the effects of the extract on skeletal muscle (Okwuasaba et a1 1987). The extract at 200 and 400 mg kg-' doses, produced a significant, dose-dependent decrease in the locomotor activity in mice during the first 3 periods of observation of 1 h duration each (Tablel). The 400-mg kg-' dose also produced a decrease in activity during the 5'h h. The onset time of convulsion was increased significantly with two doses of the extract, in a dosedependent manner, compared with the saline control group (control = 58*5.7 s., 200 mg kg-' = 9 4 f 6 6 s, 400 mg kg-' = 1 6 0 f 4 2 s.). The extract initially potentiated the amplitude of contractions of nerve-stimulated rat hemidiaphragm followed by a complete blockade at concentrations of 0.2, 0.6 and 1.8 mg d-', supporting earlier findings (Okwuasaba et a1 1987). All values are mean s.e.m.. Student's r-test was used for statistical evaluation (P < 0.05). These preliminary results indicate that a 10% ethanolic extract of P. oleracea v. sativa could have an inhibitory action on the central nervous system as it decreased locomotor activity and prolonged onset time of pentylenetetrazole induced convulsions in the models studied. Another possible mechanism of these pharmacological effects could be the skeletal muscle relaxant activity of Portulaca, which has also been reported in an earlier study on Portulaca oleracea (Okwuasaba et a1 1987).

Abstract: Background: Portulaca oleracea L. is known to have detoxification and antibacterial effects. Inflammatory responses in LPS-treated Raw264.7 cells include the secretions of NO, PGE2 and numerous cytokines. Atopic dermatitis is a chronic inflammatory skin disease. This study was performed to identify the antiinflammatory or anti-pruritic effects of Portulaca oleracea L. extract in LPS-treated Raw264.7 cells and keratinocytes and the skin of NC/Nga mice with atopic dermatitis, as well as hairless mice with pruritus. Methods: After the treatment of different concentrations for Portulaca oleracea L. extract in LPS-treated Raw264.7 cells and keratinocytes, the levels of NO, PGE2 and proinflammatory cytokines were measured in the media. Skin tissues of all Nc/Nga mice were subjected to HE31:199-206)

Abstract: This study was conducted for the antihyperlipidemic effect of ethanol extract from Portulaca oleracea in high fat diet-induced obese mice after having injected the ethanol extract from Portulaca oleracea to the obese mice with high fat diet. The 30 six-week-old male C57BL/6J mice were divided into 3 groups of 10 and fed for 5 weeks to be obese with high fat diet. Thereafter, for 4 weeks, ethanol extract from Portulaca oleracea was provided through oral injection to the 3 groups: control group (HFD), group injected with 75 mg/kg of ethanol extract from Portulaca oleracea (HFD＋POE 75) and the group injected with 125 mg/kg of ethanol extract from Portulaca oleracea (HFD＋POE 125). The serum and liver lipid and the alanine transaminase (ALT) and aspartate transaminase (AST) activity were measured. The result showed that there was no significant difference in weight gain and feed intake, and the feed efficiency ratio was significantly low in the group provided with ethanol extract from Portulaca oleracea. Serum total cholesterol was significantly low in the group of ethanol extract from Portulaca oleracea (HFD＋POE 125). It appeared that all the groups provided with ethanol extract from Portulaca loeracea reduced plasma triglyceride significantly according to the ethanol extract from Portulaca oleracea dose. There was no dose dependency of HDL-cholesterol to the dose of ethanol extract of Portulaca oleracea. LDL-cholesterol was low in the group dosed with high ethanol extract from Portulaca oleracea (HFD＋POE 125). There was difference of total cholesterol, triglyceride and total lipid contents in liver. AI (atherogenic index) and CRF (cardiac risk factor) were significantly low in the group with high dose of ethanol extract from Portulaca oleracea (HFD＋POE 125). There was no difference of serum AST activity, however, serum ALT activity was significantly low in the group with high dose of ethanol extract from Portulaca oleracea (HFD＋POE 125).

Abstract: 1 رايشناد ، يميشويب هورگ ، يزاسوراد هدكشناد ، ناهفصا يكشزپ مولع هاگشناد ، ناهفصا 2 يارتكد هورگ ،يزاسوراد ناهفصا ،ناهفصا يكشزپ مولع هاگشناد ،يزاسوراد هدكشناد ،ينيلاب يزاسوراد 3 دحاو ،يزونگوكامراف هورگ ،رايشناد اهفصا قورع و بلق تاقيقحت زكرم ،هياپ مولع تاقيقحت زكرم ،ن يژولويزيف ناهفصا ،ناهفصا يكشزپ مولع هاگشناد ،يدربراك 4 ،دشرا يسانشراك هورگ ينيلاب يميشويب ، هدكشناد يزاسوراد ، ناهفصا يكشزپ مولع هاگشناد ناهفصا ، * سردآ هبتاكم : يزاسوراد هدكشناد ،ناهفصا يكشزپ مولع هاگشناد بيرجرازه نابايخ ،ناهفصا نفلت : 09133152584 ربامن ، : 7922593 ) 0311 ( كينورتكلا تسپ : eshraghi_a82@yahoo.com تفايرد خيرات : 18 / 1 / 89 بيوصت خيرات : 11 / 8 / 89 هديكچ

Abstract: The present study is focused on the taxonomic screening of ten wild culinary vegetables that is Amaranthus viridus L, Bauhenia verigata L, Chenopodium album L, Malva parvifloraL, Medicago falcate L, Medicago polymorpha L, Melilotus indicus L, Portulaca oleracea L, Portulaca quardifida L and Solanum nigrum L. The objective of the present study is to use the foliar epidermal features for taxonomic identification of these culinary vegetables. The study based on light microscopic (LM) characterization of foliar epidermis. Shape of epidermal cells, presence and type of stomata and trichomes and stomatal index plays a key role in the identification of these species. Although detailed characterization of these species at molecular and genetic level is still needed. Key words: Ethnobotany, foliar epidermis, culinary vegetables.

Abstract: Portulaca oleracea ( family Portulacaceae ) is a succulent herb, distributed mainly in the warmer parts of the world. The leaves and the juice of aerial parts of the plant have been used traditionally for treatment of swelling and inflammation (Okwuasaba et a1 1986). This ethnopharmacological use of Portulaca has not been reported in the scientific literature. The aim of the present investigation was to evaluate the possible anti-inflammatory activity of three species of Portulaca. Inflammation was induced in the hind paw of Wistar rats by injecting carrageenan subcutaneously in the subplantar region. Two dose levels (200 and 400 mg kg-') of a 10% ethanolic extract of the aerial part of each species were administered intraperitoneally or orally, 30 min after carrageenan injection. The hind paw volume was measured before and after the carrageenan challenge plethysmometrically (Burch et a1 1990) at 30-min intervals for 6 h then again after 24 h. The mean values ( f s.e.m.) were compared with the corresponding values of the control and diclofenac sodium (4 mg kg-' , i.p.) groups using Student's t-test (P < 0.05). The three species of Portulaca significantly reduced the increase in hind paw volume induced by carrageenan. This effect was comparable with that of diclofenac sodium during the first 6 h, but lasted for 24 h after treatment (Tablel). Both Portulaca grandijora and diclofenac sodium showed significantly more potent anti-inflammatory activity than Portulaca oleracea and Portulaca oleracea v. sativa during the first 2 h. There were no significant differences between the anti-inflammatory effects of 200and 400mg kg-' doses of Portulaca. Oral administration of Portulaca oleracea v. sativa did not show any significant antiinflammatory activity. The results indicate anti-inflammatory action of Portulaca extract in the doses studied supporting the traditional use of Portulaca in inflammatory conditions. The observation that the extract was not active orally indicates that the active constituents might be destroyed by gastric juice or transformed to inactive ingredients by the first-pass metabolism.

Abstract: 쇠비름의 생리활성을 알아보기 위하여 무기물 함량 및 항산화 활성을 분석하였다. 쇠비름의 무기물은 총 9종 검출되었으며, 총량은 6025.80 mg/100 g으로 칼륨이 3846.99 mg/100 g으로 가장 높았다. 물 및 에탄올 추출물의 추출 수율은 각각 14.84% 및 24.93%였다. 쇠비름 에탄올 추출물의 총 페놀화합물 및 플라보노이드 ...

Abstract: Production of pycnidia and conidia by Phyllosticta theacearum, Phyllosticta sp. (ex Euonymus) and Phyllosticta sp. (ex Portulaca) (grown on PDA), and P. cruenta (from specimens) was studied. On PDA, conidial appendages of Phyllosticta sp. (ex Portulaca) disappeared completely after 16 days, of P. theacearum after 29 days, and of Phyllosticta sp. (ex Euonymus) after 14 days. In slide preparations mounted in water, appendages of all four species persisted; the appendages of P. cruenta and Phyllosticta sp. (ex Euonymus) became 2-4 times longer within 30 minutes, while those of Phyllosticta sp. (ex Portulaca) and P. theacearum remained unchanged.

Abstract: The leaves and stems of P.olerocen were studied macroscopically & microscopically. Standard procedures from the Pharmacopoeia were used to determine various parameters. For the powdered plant material total ash (TA), acid insoluble ash (AIA) and water soluble ash (WSA) were determined. Loss in weight on drying at 105OC (LWD), pH of 1% and 10% aqueous solutions pHA), solubility in water (WS) and alcohol (AS) were determined Table 1. The powdered material was successively extracted with petroleum ether (SPE), chloroform (SC) and alcohol (SA). IR, W, and TLC finger printing were carried out for different successive extractives (SE).Table 2. The presence of steroids, terpenoids, proteins, vitamins, flavonoids contents were confirmed qualitatively in aforesaid extractives, whereas the ash analysis showed the presence of iron, calcium and potassium.

Abstract: Aim and objectives – The aim of this research was to verify the identity and the possible cytotoxicity of Portulaca oleraceea and P. grandiflora species. This study is the first step in use these species to development of pharmacologically active extracts.

Abstract: Portulaca oleracea (Linn.) family Portulacaeae commonly known as Brihalloni, Gholika, Lona, Lonamla, Loni, Lonika & Lunia. The juice was claimed to have general cardiotonic activity. Present study was carried out to determine the same by using fresh juice of aerial part Portulaca olaracea with different dilutions & compared with cardiotonic activity of digoxin-the life saving cardiotonic. The activity was tested by using isolated frog heart assembly. The present preliminary studies confirm the better cardiotonic activity of Portulaca olaracea than digoxin. Further studies can confirm the reduced toxicity & this will be the advantage of Portulaca olaracea over digitalis. Thus, in future it will be interesting to isolate the active chemical constituents which are responsible for the cardiotonic activity.

Abstract: The callus was induced from the leaves of Portulaca oleracea L.,then the callus was used for the receptor of genetic transformation mediated by Agrobacterium tumefaciens.The results showed that the resistant calli was screened and confirmed to be transformants by GUS histochemical assays and PCR assays.It showed that genetic transformation of Portulaca oleracea L.callus mediated by Agrobacterium tumefaciens was entirely feasible.

Abstract: The study results showed that the best supporter media for callus induction from local purslane (Portulaca oleracea L.) stems and leaves sterile explants , those MS media(Murashige and Skoog medium) supporting with hormone regulators BA(Benzyl adenine), NAA(Naphthalene Acetic Acid) in concentrations 1.0 , 2.0 , 4.0 , mg/L from each of them as well as MS medium containing BA : NAA in 2:1 mg/L respectively , and the callus was inculcation during 15-20 day . The result of separating alkaloids from callus of stems and leaves and shoots of plant showed in Infrared Spectrophotometer technique (IR) separating of Oleracein B and Oleracein D that degree in purity and the best of it appear in stems callus extract . when Thin Layer Chromatography Technique (TLC) was made for extracted alkaloids , Rate of Flow (Rf) values appeared very comparatively to these samples (0.77, 0.82, 0.80) to each of stems callus alkaloid, leaves callus alkaloid and plant alkaloid respectively , then retention time record for it , and main band recognized in plant alkaloid at 4.755 min , also 4.646 min and 4.657 min in stems callus alkaloid and leaves callus alkaloid respectively by using High-Performance Liquid Chromatography (HPLC) technique , that result prove of Oleraceins (B, D) occurrences in samples of purslane . The fatty acids which occur in purslane plant , calli of stems and leaves are detect by using Capillary Gas Chromategraph (CGC) technique , the plant extract showed 12 fatty acids in it , but in low concentration compared with that appear in leaves callus extract for most fatty acids especially omega – 3 fatty acid (C18: 3) , when the stems callus extract record the lower ratio of fatty acid occurrences that it was 3 fatty acids only (C16: 0 , C16: 1, C18: 1). ـــــــــــــــــــــــ ـــ ــــــ ـــــــــــــــــــــــ ةمدقملا عُ  د ةكرابملا ةلقبلا تابن Portulaca oleracea L. ً ايبط ً اتابن ةليوط ةرتفلو (Chan et al., 2000) ذا ، نيتوراكاتيبلا نم ةريبك ةبسن ىلع يوتحي هنأ (Simopoulos et al., 1992) اهنم تانيماتيف ةدعب ينغ كلذكو ، A و C نيماتيف نع ً لاضف E رثكأ هيف دوجوملا 6 ـب رثكأو خنابسلا يف امع تارم 7 رزجلا يف امم تارم (Seabreezed , 2008) نيماتيفب ىنغأ تابنلا اذه ، C خنابسلا نم رثكا ىتح (Simopoulos et al., 1992) ، مويساتوبلاو مويسينغملا نم ةيلاع تايوتسم ةلقبلا تابنلو ) ،يناطحقلا 2006 ( ، ةساردل ً لاضفم دعي امك تاغبص Betalains (Noda and Adachi, 2000) ةسمخ ىلع هئاوتحا نع ً لاضف ، عاونأ نم تاديولقلا (Xiang et al., 2005) م اهن 3 عاونأ راشأ اهل (find-health, 2010; Yang et al., 2007) ةينهدلا ضامحلأاو ةيديولقلا تابكرملا ضعب صيخشت ............ 79 تاديونوفلافلاو (Xu et al., 2006) Flavonoids عت هذهو ، د تي امل تابنلا تابكرمل ةثيدح تاسارد نم هب عتم ةيمهأ ةماه ةصاخ تابكرمو ةيئاذغ . عت د ةيتابنلا رداصملا ىنغأ نم ةكرابملا ةلقبلا ضامحلأاب يتلاو ةددعتملا ةعبشملا ريغ ةينهدلا اهمهأ كينيلونيللا ضماح linolenic acid اغيموا ىمسملا 3 (Omega –3) (Yan et al., 2009 ; Teixeria et al., 2010) ، ذإ ت ــــــ ـ ه دع ــ ا هذ لأ ضامح كينيل ونيل α-linolenic acid (LAN) كيلونلو Linoleic Acid (LA) لا دض ةيامحللو ةحصللو يعيبطلا يرشبلا ومنلل ةيرورض ضارملأا (Palaniswamy et al ., 2001) . ف ق د ينهدلا ضماحلل يرضخ ردصم ىنغأ اهنأب ةكرابملا ةلقبلا فيرعت مت Linolenic Acid نوكملا ا اغيموا ـلل سيئرل (Simopoulos and Salem, 1986) 3. تابكرملا نم ديدعلا ةكرابملا ةلقبلل ىرخلأا كيلاسكولاا ضماح اهنم Oxalic acid تانيراموكلاو Coumarins ةددعتملا تايركسلاو Polysaccharides يلاكلاو ك ةيبلقلا تاديسو Cardiac glycosides (Li et al., 2009) . نإ نكل ةيئاذغلا ةميقلا يف طقف ىلعأ سيل تابنلا اذه رثكلأا ةفلتخملا ةيئيبلا فورظلا عم ً املقأت (Simopoulos et al., 1995) . نم اقلاطنا ةيمهأ ملقأتلا ىلع هتردقو تابكرم نم هيوتحي امل تابنلا اذه ، تفده ةيلاحلا ةساردلا ىلإ رابتخا ةعارز تابن ا ةكرابملا ةلقبل ً ايجيسن و ةباجتسا ةظحلامو ةقطنملا يف ايلحم ةدوجوملا ءازجأ تابنلا ) ةقرولا ،قاسلا ( سلاكلا ثادحتسلا ةيناكمإو ً لاضف ،اهتعارزو روذبلا ميقعتب هنم ةمقعم تارداب ىلع لوصحلا ةسارد نع تابنلا تاصلختسم يف ةيضيلاا تابكرملا ضعب لماكلا ) عرفلأا ةيرضخلا ( اهتنراقمو تاصلختسمب ا سلاكلا جتانل نم ةيديولقلا تابكرملا ىوتحم ثيح نم ةقرولاو قاسلل ةيجيسنلا ةعارزلا ضامحلأاو كلذ ،ةعبشملا ريغو ةعبشملا ةينهدلا اهنلأ تلالاسلا فلاتخاب فلتخت ً ايفارغج اهومن قطانمو نادلبلا فلاتخا بسحبو . لمعلا قئارطو داوملا اهتعارزو اهميقعتو روذبلا ردصم ا روذب تمدختسا ةكرابملا ةلقبل L. Portulaca oleracea يعيبطلا تابنلا نم اهيلع لوصحلا مت يتلا ً ايلحم يمانلا ) ةايحلا مولع مسق يف نيصتخملاب ةناعتسلااب اهفينصت نم دكأتلا مت / ةيبرتلا ةيلك . ( تعبتا رثكأ نايبل روذبلا ميقعتل ةقيرط نم اهلضفأ روذب ىلع لوصحلا يف تاثولملا نم ةيلاخ تاذو ةلماعملا يفف ،ةيلاع ةيويح ىلولأا مويدوصلا تيارولكوبياه نم نوكملا مقعملا لولحملاب روذبلا تمقع NaOCl زيكرت 6 % ) يراجتلا رصاقلا ( ةبسنب رطقملا ءاملاب ففخملا ) 1 مجح : 2 مجح ( ددملو يلاوتلا ىلع

Abstract: Hypoglycemic and hypolipidemic effects of polysaccharides form Portulaca oleracea L.(POP)on alloxan-induced diabetic mice were studied.The results showed that POP decreased the body weight,fasting blood glucose(FBG),TC and TG levels of diabetic mice,and POP increased the concentration of HDL-c and serum insulin level of diabetic mice.POP at the dose of 400mg/kg bw exhibited the optimal effect.POP could control blood glucose and modulate the metabolism of glucose and blood lipid in diabetes mice.

Abstract: Nowadays,with the increasing incidence of hyperlipidemia,seeking for a natural medicinal which can decrease blood lipids has become one of the most prevalent topicsThe Portulaca oleracea Lis one of the medicine food homology wild plants and the safety are extremely highIt includes many clinical pharmacologyIn recent years,study found that Portulaca oleracea Lhave good function of lowering blood fatThis paper summarized the relevant research in chemical composition,hyperlipidemia–lowering pharmacology and mechanism of actionThe aim is to provides some clues for the exploitation and utilization research of Portulaca oleracea L

Abstract: Four known compounds cholest-4-en-3β-ol(1),cholest-5-en-3β-ol(2),friedelan-4α-methyl-3β-OH(3) and β-sitosterol 3-O-β-D-glucopyranoside(4) were isolated from the ethyl acetate extraction of Portulaca oleracea.Their structures were elucidated on the basis of MS and NMR spectral data.Compounds 1,2,and 4 were isolated from this plant for the first time.The anti-tumor activity of compound 3 was preliminarily evaluated.

Abstract: Dissertacao de mest., Ciencias Biomedicas, Departamento de Ciencias Biomedicas e Medicina, Univ. do Algarve, 2011

Abstract: Weed control is of fundamental importance when planting horticultural crops, particularly during the establishment phase. Weeds compete for nutrients, water and light, and can severely threaten the survival and early growth of newly planted crops. Failure to control weeds represents one of the single most important factors leading to crop loss. Knowledge on the existence of the diversity of weed species in greenhouses is of our main concern in this study in order to develop a most efficient and effective weed control strategies. Sixty-two greenhouses were surveyed in 3 cities and counties of Gyeongnam area in March to October 2009 to investigate the feature of weed occurrence in polyvinyl chloride (PVC) after harvesting of the main crops. Forty-one weed species were identified and classified to 18 families which were composed of 14 annual weeds, 18 summer annual weeds and 9 perennial weeds. On the other hand, broadleaf, grasses and sedges recorded with 30, 7 and 4 weed species, respectively. Asteraceae was the most dominant weed species (9 species) noted followed by Poaceae (7 species), Cyperaceae (4 species), Caryophyllaceae and Brassicaceae (3 species respectively) and other families have 1~2 species. The dominant weed species occurred in the greenhouse based on the summed dominance ratio. These weeds were Digitaria sanguinalis, Cyperus iria, Portulaca oleracea, Rorippa islandica, Mazus japonicas, Cardamine flexousa, and Eclipta prostrata and others. Weed occurrence in the greenhouse after horticultural crops consisted of summer annuals (4 species), winter annuals (3 species), and perennial annuals (1 specie). The dominant species occurred in tilled soil based on summed dominance ratio of weeds were Cardamine flexousa (88.1%), Eclipta prostrate (57.4%) and Portulaca oleracea (55.2%). Comparison of weed occurrence was thoroughly surveyed also in which field without PVC, weed species were Portulaca oleracea (55.2), Eclipta prostrata (57.9%) and Trigonotis peduncularis (25.1%) and field with PVC, the identified weeds were Portulaca oleracea (98.75), Trigonotis peduncularis (49.1%), and Eclipta prostrata (36.8%).

Abstract: Introduction Portulaca oleracea, commonly referred to as purslane, is a weedy medicinal plant known to withstand extreme environmental conditions (see picture below top). Like all plants, purslane is immobile and can therefore only form chemical responses to stressful conditions. These chemicals are referred to as secondary metabolites and can perform a number of functions: deterring herbivores or sequestering heavy metals. In the case of purslane, high levels of these secondary metabolites allow purslane to thrive in conditions far too hostile for many other plants, including areas of very little water or very high salinity. Our project examined antioxidant levels in three different varieties of Portulaca oleracea using two different stress conditions. We expected to see an overall increase in antioxidant levels as a response to increased stress. We also expected some varieties to have differential responses to the stressful stimuli. These tests will help us understand how plants respond during times of extreme heat, rising sea levels and drought brought on by climate change.