scholarly journals Response Surface Optimized Ultrasonic-Assisted Extraction of Flavonoids from Sparganii Rhizoma and Evaluation of Their in Vitro Antioxidant Activities

Molecules ◽  
2012 ◽  
Vol 17 (6) ◽  
pp. 6769-6783 ◽  
Author(s):  
Xinsheng Wang ◽  
Qinan Wu ◽  
Yanfang Wu ◽  
Guangyun Chen ◽  
Wei Yue ◽  
...  
Keyword(s):  
Response Surface ◽  
Antioxidant Activities ◽  
Assisted Extraction ◽  
Ultrasonic Assisted ◽  
Ultrasonic Assisted Extraction

scholarly journals Flavonoids Extraction fromTaraxacum officinale(Dandelion): Optimisation Using Response Surface Methodology and Antioxidant Activity

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Zongxi Sun ◽  
Ruiqiang Su ◽  
Jianwei Qiao ◽  
Zhiquan Zhao ◽  
Xinsheng Wang
Keyword(s):  
Antioxidant Activity ◽  
Response Surface ◽  
Extraction Yield ◽  
Solid Ratio ◽  
Plant Resource ◽  
Assisted Extraction ◽  
Ultrasonic Assisted ◽  
Macroporous Adsorption Resin ◽  
Ultrasonic Assisted Extraction

The Box-Behnken design combined with response surface method was employed to optimize ultrasonic-assisted extraction of flavonoids fromTaraxacum officinale. The optimized results showed that the highest extraction yield with ultrasonic-assisted extraction could reach 2.62% using 39.6% (v/v) ethanol and 59.5 : 1 (mL/g) liquid-solid ratio for 43.8 min. The crude extract was then purified by HPD-100 macroporous adsorption resin, and the flavonoids content in the purified extract increased to 54.7%. The antioxidant activity of the purified flavonoids was evaluatedin vitroby scavenging capacity of ABTS or DPPH,β-carotene bleaching, and FTC test. The knowledge obtained from this study should be useful to further develop and apply this plant resource.

scholarly journals Response Surface Optimized Ultrasonic Assisted Extraction of Total Flavonoids from QingLi Cao and Antioxidant Activities

2015 ◽  
Vol 9 (1) ◽  
pp. 134-142 ◽  
Author(s):  
Xudong Jiang ◽  
YaoLing Liao ◽  
GuiXi Lu ◽  
Zhike Xiao
Keyword(s):  
Response Surface ◽  
Antioxidant Activities ◽  
Reducing Power ◽  
Total Flavonoids ◽  
Extraction Temperature ◽  
Ultrasound Assisted Extraction ◽  
Solid Ratio ◽  
Assisted Extraction ◽  
Ultrasonic Assisted ◽  
Ultrasonic Assisted Extraction

An ultrasound-assisted extraction technique was used to extract the total flavonoids from QingLi Cao. The optimal conditions were ethanol concentration 59.20%, liquid-to-solid ratio 31.15 mL/g, extraction time 57.42 min and extraction temperature 58.57°C, which were determined using response surface methodology. The antioxidant activities including reducing power, ABTS+, DPPH, superoxide anion and hydroxyl radical were evaluated, which suggested significant antioxidant activities.

scholarly journals Setup of an Ultrasonic-Assisted Extraction to Obtain High Phenolic Recovery in Crataegus monogyna Leaves

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4536
Author(s):  
Beatriz Martín-García ◽  
María del Carmen Razola-Díaz ◽  
Ana María Gómez-Caravaca ◽  
Guillermo Benítez ◽  
Vito Verardo
Keyword(s):  
Phenolic Compounds ◽  
Leaf Extract ◽  
Antioxidant Activities ◽  
Total Phenolic ◽  
Crataegus Monogyna ◽  
Solid Ratio ◽  
Assisted Extraction ◽  
Ultrasonic Assisted ◽  
Ultrasonic Assisted Extraction

Hawthorn leaves are a rich source of phenolic compounds that possess beneficial activities for human health. Ultrasonic-assisted extraction (UAE) is an extraction technique frequently used for the isolation of phenolic compounds in plants. Thus, in this study, a Box–Behnken design was used to optimize UAE conditions such as the percentage of acetone, the extraction time and solvent-to-solid ratio (v/w) in order to obtain the maximum content of total compounds by Folin–Ciocalteu and the maximum in vitro antioxidant activity by DPPH, ABTS and FRAP assays in Crataegus monogyna leaves. The optimum conditions to obtain the highest total phenolic content and antioxidant activities were 50% acetone, 55 min and 1/1000 (w/v). A total of 30 phenolic compounds were identified and quantified in C. monogyna leaf extract obtained at these optimum UAE conditions. HPLC-MS allows the identification and quantification of 19 phenolic compounds and NP-HPLC-FLD analyses showed the presence of 11 proanthocyanidins. According to the results, the most concentrated phenolic compounds in C. monogyna leaf extract obtained at optimum UAE conditions were phenolic acid derivatives such as protocatechuic acid-glucoside, dihydroxy benzoic acid pentoside and chlorogenic acid, flavones such as 2″-O-rhamnosyl-C-hexosyl-apigenin, flavonols such as hyperoside and isoquercetin and proanthocyanidins such as monomer and dimer. As a result, the optimized UAE conditions could be used to obtain an extract of C. monogyna leaves enriched with phenolic compounds.

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