Antioxidant activities of extract and fractions from Tuber indicum Cooke &amp; Massee

Guo, Tao; Wei, Lei; Sun, Jianjun; Hou, Cheng‐Lin; Fan, Li

doi:10.1016/j.foodchem.2011.02.030

Cited by 74 publications

(78 citation statements)

References 23 publications

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“…The mixture was shaken vigorously and left to stand in the dark for 30 min, and the absorbance was then measured at 517 nm against a blank. The antioxidant capacity of samples was also estimated in another assay according to the procedure described by Guo et al (2011). The reagents were added into a reaction tube in the following order: 0.3 mL of 20 mM sodium salicylate, 1.0 mL of 1.5 mM FeSO4, 1.0 mL of various concentrations of sample solution, 0.7 mL of 6 mM H 2 O 2.…”

Section: Evaluation Of Antioxidant Activitymentioning

confidence: 99%

“…The reagents were added into a reaction tube in the following order: 0.3 mL of 20 mM sodium salicylate, 1.0 mL of 1.5 mM FeSO4, 1.0 mL of various concentrations of sample solution, 0.7 mL of 6 mM H 2 O 2. The solution was mixed immediately, and placed in a 37 ºC water bath for 1 h. The absorbance measurement of the mixture was recorded at 510 nm against a blank.The reducing power was measured according to the method described by Guo et al (2011) with slight modifications. An aliquot of each sample (1.0 mL), of different concentrations, was mixed with 2.5 mL of phosphate buffer (200 mM, pH 6.6) followed by 2.…”

Section: Evaluation Of Antioxidant Activitymentioning

confidence: 99%

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Optimization of Ultrasound-Assisted Extraction of Flavonoids from Cryptotaenia japonica Hassk. and Evaluation of Antioxidant Activity

Lu¹,

Xu²,

Yang³

et al. 2015

JAS

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The present study optimized the ultrasound assisted extraction (UAE) conditions using Box-Behnken design (BBD) with response surface methodology (RSM) and evaluated the antioxidant activity of total flavonoids from Cryptotaenia japonica Hassk. The results showed that the optimum conditions were 55% ethanol concentration, 1:30 g/mL solid to solvent ratio, 400 W ultrasound power, 70 min extraction time and 3 cycles. Under these optimum conditions, the extraction yield of total flavonoids was 33.110 ± 0.742 mg/g DW (dry weight), which was well consisted with value predicted by the model. The RSM optimized extract was subsequently checked for antioxidant activity by 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging assay, hydroxyl scavenging assay and reducing power assay. Under the flavonoid concentration of 3.0 mg/mL, antioxidant scavenging activity were of 79.87±2.7% and 71.60±2.6% for DPPH and hydroxyl assay while for reducing power and absorbance of 1.200±0.053 was obtained. Furthermore, the composition in antioxidants were investigated, and the luteolin and apigenin were determined. The results indicated that ultrasound assisted extraction is a promising technique for extraction of flavonoids from C. japonica Hassk and the flavonoids could be explored as a potential antioxidant agent for use in medicine or functional foods.

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Section: Evaluation Of Antioxidant Activitymentioning

confidence: 99%

Section: Evaluation Of Antioxidant Activitymentioning

confidence: 99%

Optimization of Ultrasound-Assisted Extraction of Flavonoids from Cryptotaenia japonica Hassk. and Evaluation of Antioxidant Activity

Lu¹,

Xu²,

Yang³

et al. 2015

JAS

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“…The metal ions both possess catalytic activity and correlate with the incidence of arthritis and cancer. 32 The ferrous ion-chelating activities of the tested phthalonitrile and its phthalocyanine complexes are presented in Figure 9. It was observed that chelating activities of the tested phthalonitrile and its phthalocyanine complexes increased when the concentration increased.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and antioxidant, aggregation, and electronic properties of 6-tert-butyl-1,4-benzodioxine substituted phthalocyanines

Ağırtaş¹,

Cabir²,

Gümüş³

et al. 2018

Turk J Chem

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As a starting material, 7-tert-butyldibenzo [b,e] [1,4] dioxine-2,3-dicarbonitrile was prepared by the reaction of 4-tert-butylcatechol with 4,5-dichlorophthalonitrile. Metallophthalocyanine complexes (4-7) were obtained by cyclotetramerization of 7-tert-butyldibenzo [b,e] [1,4] dioxine-2,3-dicarbonitrile. All compounds were characterized by elemental analysis and other spectroscopic methods (IR, UV/Vis, and 1 H NMR). Phthalocyanine compounds remained nonaggregated in tetrahydrofuran at the studied concentration ranges. Metallophthalocyanines (4-7) were tested for their antioxidant activities. The antioxidant activity processes included evaluation of radical-scavenging activity, chelating activity, and reducing power. These compounds were compared to standard antioxidant ascorbic acid. The electronic data of the new compounds were obtained by computational calculations at the B3LYP/6-31G (d,p) level of theory.

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“…Hydroxyl radical-induced oxidative damage is known to be involved in cancer, inflammation, neurodegeneration, and also in aging. 34,39 Since quercetin is a highly effective hydroxyl radical scavenger, 42,43 it is obvious that, except PbE1, all other P. brutia bark extracts, having EC 50 values about 2.3-3 times higher than that of quercetin, have good hydroxyl radical scavenging effects.…”

Section: Discussionmentioning

confidence: 99%

“…33,34 The percent of hydroxyl radical scavenging activity was calculated using the following formula: 100 · (C -S)/(C), where C is the absorbance of the control and S is the absorbance in the presence of extracts or quercetin.…”

Section: Hydroxyl Radical Scavenging Assaymentioning

confidence: 99%

In VitroStudy on the Antioxidant Activity of a Polyphenol-Rich Extract fromPinus brutiaBark and Its Fractions

Creţu

Karonen

Salminen

et al. 2013

Journal of Medicinal Food

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A crude hydromethanolic extract from Pinus brutia bark and its fractions (diethyl ether, ethyl acetate, n-butanol, and aqueous fractions) were studied with regard to their phenolic content and antioxidant activities. The total phenolics and proanthocyanidins in each extract were quantified by spectrophotometric methods; the polyphenolic profile was analyzed by RP-HPLC-DAD-ESI-MS. All extracts were tested with regard to their ability to scavenge free radicals (ABTS radical cation, superoxide and hydroxyl radicals), reduce ferric ions, and inhibit 15-lipoxygenase. P. brutia bark extracts had high phenolic contents (303.79 -7.34-448.90 -1.39 mg/g). Except diethyl ether extract, all other extracts contained proanthocyanidins ranging from 225.79 -3.94 to 250.40 -1.44 mg/g. Several polyphenols were identified by RP-HPLC-DAD-ESI-MS: taxifolin in diethyl ether extract, a taxifolin-O-hexoside, catechin, procyanidin dimers, and trimers in ethyl acetate extract. Except diethyl ether extract, all other extracts were effective scavengers of superoxide and hydroxyl radicals (EC50 = 33.5 -1.1-54.93 -2.85 lg/mL and 0.47 -0.06-0.6 -0.0 mg/mL, respectively). All extracts had noticeable 15-lipoxygenase inhibitory effects (EC50 = 22.47 -0.75-34.43 -2.25 lg/mL). We conclude that P. brutia bark is very promising for the dietary supplements industry due to its high free radical scavenging and 15-lipoxygenase inhibitory effects.

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Antioxidant activities of extract and fractions from Tuber indicum Cooke & Massee

Cited by 74 publications

References 23 publications

Optimization of Ultrasound-Assisted Extraction of Flavonoids from Cryptotaenia japonica Hassk. and Evaluation of Antioxidant Activity

Optimization of Ultrasound-Assisted Extraction of Flavonoids from Cryptotaenia japonica Hassk. and Evaluation of Antioxidant Activity

Synthesis and antioxidant, aggregation, and electronic properties of 6-tert-butyl-1,4-benzodioxine substituted phthalocyanines

In VitroStudy on the Antioxidant Activity of a Polyphenol-Rich Extract fromPinus brutiaBark and Its Fractions

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