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| Registros recuperados: 101 | |
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| Qiu,Congyang; Zhu,Tonglin; Lan,Liying; Zeng,Qingmao; Du,Zhiguo. |
| ABSTRACT Maceaene and macamide contents as well as antioxidant effect of petroleum ether extract of black maca (BM), yellow maca (YM), and purple maca (PM) on diabetes mellitus (DM) rats were investigated. The results showed that seven, six, and five analogues of macamides were identified from the petroleum ether extracts of BM, YM, and PM, respectively. BM extract exhibited the highest contents of total macamides. Comparatively, the PM extract has the lowest macamide quantity. The maceaene contents in all the extracts showed no significant difference (p>0.05). Macamide contents in maca with the same color were not statistically different. Pharmacological results showed that 60-day oral administration of the petroleum ether extract of maca (100 mg/kg.d)... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Maca extract; Antioxidant activity; Maceaene; Macamide; Diabetes mellitus rat. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132016000100326 |
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| Lima,Annete de Jesus Boari; Corrêa,Angelita Duarte; Saczk,Adelir Aparecida; Martins,Mariana Pereira; Castilho,Rachel Oliveira. |
| Different solvents were evaluated for the extraction of jabuticaba anthocyanin pigments, identifying, quantifying and verifying the stability of the anthocyanins, as well as the conduction of three antioxidant activity assays and determination of the vitamin C levels. The maceration with ethanol acidified with HCl 1.5 mol L-1 (85:15) provides better pigment extraction and stability. The skin is anthocyanin rich, presenting 1.59 and 2.06 g 100 g-1 of dry matter in the Paulista and Sabará varieties, respectively. Cyanidin 3-glucoside is the majority pigment of the skins, followed by delphinidin 3-glucoside. The highest level of vitamin C was found in the skins and seeds of both varieties. It was verified that the skins, presented more antioxidant activity,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Jabuticaba; Anthocyanin; Method of extraction; Vitamin C; Antioxidant activity. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452011000300023 |
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| HSU,CHIN-YUAN. |
| Free radicals induce numerous diseases by lipid peroxidation, protein peroxidation, and DNA damage. It has been reported that numerous plant extracts have antioxidant activities to scavenge free radicals. Whether Polygonum aviculare L. (Polygonaceae) has antioxidant activity is unknown. In this study, dried Polygonum aviculare L. was extracted by ethanol, and the extract was lyophilized. The antioxidant activities of extract powder were examined by free radical scavenging assays, superoxide radical scavenging assays, lipid peroxidation assays and hydroxyl radical-induced DNA strand scission assays. The results show that the IC50 value of Polygonum aviculare L. extract is 50 µg/ml in free radical scavenging assays, 0.8 µg/ml in superoxide radical scavenging... |
| Tipo: Journal article |
Palavras-chave: Antioxidant activity; Free radical; Phenolics; Lipid peroxidation; DNA damage Polygonum aviculare L. |
| Ano: 2006 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000200010 |
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| Kumar,R.S.; Sivakumar,T.; Sunderam,R.S.; Gupta,M.; Mazumdar,U.K.; Gomathi,P.; Rajeshwar,Y.; Saravanan,S.; Kumar,M.S.; Murugesh,K.; Kumar,K.A.. |
| The present study was carried out to evaluate the antioxidant and antimicrobial activities of a methanol extract of Bauhinia racemosa (MEBR) (Caesalpiniaceae) stem bark in various systems. 1,1-Diphenyl-2-picryl-hydrazyl (DPPH) radical, superoxide anion radical, nitric oxide radical, and hydroxyl radical scavenging assays were carried out to evaluate the antioxidant potential of the extract. The antioxidant activity of the methanol extract increased in a concentration-dependent manner. About 50, 100, 250, and 500 µg MEBR inhibited the peroxidation of a linoleic acid emulsion by 62.43, 67.21, 71.04, and 76.83%, respectively. Similarly, the effect of MEBR on reducing power increased in a concentration-dependent manner. In DPPH radical scavenging assays the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bauhinia racemosa; Antioxidant activity; Lipid peroxidation; Scavenging superoxide; DPPH assay; Antimicrobial activity. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005000700004 |
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| Desmarchelier,C.; Coussio,J.; Ciccia,G.. |
| Achyrocline satureioides (Lam.) DC. (Compositae) is a medicinal herb used in Argentina, Uruguay, Brazil and Paraguay for its choleretic, antispasmodic and hepatoprotective properties. The presence of the flavonoid quercetin and its derivatives, and of different phenolic acids such as caffeic, chlorogenic and isochlorogenic acids in the aerial parts of this plant has led us to study the antioxidant activity of its extracts using different bioassays. The inhibition of luminol-enhanced chemiluminescence by the aqueous and methanolic extracts was used to show that their total reactive antioxidant potential index (TRAP; in µM Trolox equivalents) was 91.0 ± 15.4 and 128.1 ± 20.1 µM, respectively, while the total antioxidant reactivity index (TAR) was calculated... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Achyrocline satureioides; Antioxidant activity; Luminol-enhanced chemiluminescence; Thiobarbituric acid-reactive substances; Hydroperoxide-initiated chemiluminescence; Lipid peroxidation; DNA damage; Reactive oxygen species. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1998000900010 |
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| Mosbah,Habib; Sassi,Ahlem Ben; Chahdoura,Hassiba; Snoussi,Mejdi; Flamini,Guido; Achour,Lotfi; Selmi,Boulbaba. |
| The in-vitro antioxidant activity of Rhaponticum acaule essential oil (RaEO) was evaluated using β-carotene/linoleic acid bleaching, chelating activity, and lipid peroxidation inhibition (TBARS) assays. The antimicrobial activity of RaEO was assessed by disc diffusion and microdilution methods against 8 bacteria and 4 yeast. Finally, the allelopathic activity of RaEO on the seed germination and the shoot and root elongation of lettuce (Lactuca sativa L.) seedlings were investigated. According to our results, the RaEO exhibited significant antioxidant activity, similar to those of standards (BHT and ascorbic acid) with IC50 values of 0.042 and 0.045 mg/mL obtained by β-carotene bleaching and TBARS assays, respectively. On the other hand, despite its... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rhaponticum acaule essential oil; Antioxidant activity; Antimicrobial activity; Allelopathic activity. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502020000100611 |
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| Balois-Morales,Rosendo; Jiménez-Zurita,José Orlando; Alia-Tejacal,Irán; López-Guzmán,Graciela Guadalupe; Palomino-Hermosillo,Yolotzin Apatzingán; Sánchez-Herrera,Leticia Mónica. |
| Abstract The changes in concentration of vitamin C, enzymatic and antioxidant activity during the ripening of two soursop selections (G1 and G2) at room temperature (22 ºC) and refrigeration (15 ºC) with an HR 85% were evaluated. The content of soluble protein, the activity of catalase (CAT), superoxide dismutase (SOD), peroxidase (POD), the concentration of vitamin C, as well as the antioxidant activity was evaluated by DPPH, ABTS and FRAP methods. The initial soluble protein concentration of the G1 and G2 selections diminished at 22 and 15 °C during ripening. Fruits stored at 22 °C showed the highest CAT activity. The maximum activity of SOD was recorded on the sixth and fourth day in fruits stored at 22 and 15 ºC, respectively. Fruits stored at 22 °C... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Annona muricata; Ripening; Enzymatic activity; Antioxidant activity; Refrigeration. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452019000100303 |
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| Mello,Fernanda Robert de; Bernardo,Claudia; Dias,Caroline Odebrecht; Gonzaga,Luciano; Amante,Edna Regina; Fett,Roseane; Candido,Lys Mary Bileski. |
| Pitaya peel can be used as a raw material for betalains extraction. The aim of this research was to quantify phenolic compounds, antioxidant activity and betalains on pitaya peel. Furthermore, evaluate the betalains stability against various pH conditions and exposure time of heating. The results showed that pitaya peel contains phenolic compounds and presented antioxidant activity. Moreover it showed high concentration of betalains (101.04mg equivalent to betanin. 100g-1) which were stable over a wide pH range (3.2 - 7.0) and were resistant to heating (100oC) up to 10 minutes at pH range from 3.7 to 5.5. Therefore, pitaya peel is a promising source of betalains which can be applied as a natural colorant for food. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Betalains; Antioxidant activity; Colorant; Phenolic compounds. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782015000200323 |
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| Omisore,N.O.A.; Adewunmi,C.O.; Iwalewa,E.O.; Ngadjui,B.T.; Adenowo,T.K.; Abegaz,B.M.; Ojewole,J.A.; Watchueng,J.. |
| Dorstenia barteri and D. convexa extracts and some isolated components of the former were investigated for effectiveness against Trichomonas gallinarum and compared with quercetin and quercitrin. The antioxidant activity of the extracts/compounds was also determined. The minimum lethal concentrations (MLCs) for the extract of D. barteri leaves and twigs at 24 h were found to be 15.625 and 15.625 µg/ml, respectively. However, the MLCs of the leaf and twig extract of D. convexa were 125 and 437.5 µg/ml, respectively. The prenylated and geranylated chalcones were as active as the prenylated flavones, 6-prenylapigenin and the diprenylated derivative 6,8-diprenyleridictyol. The order of the antitrichomonal activity of the compounds at 24 h was: quercetin (0.121... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dorstenia species; Antitrichomonal; Antioxidant activity; Prenylated flavonoids. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005000700012 |
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| Registros recuperados: 101 | |
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