Ultrasound-assisted extraction of natural antioxidants from the flower of Limonium sinuatum: Optimization and comparison with conventional methods

•Ultrasound-assisted extraction of natural antioxidants from the flowers of Limonium sinuatum.•Ethanol concentration, solvent/material ratio, ultrasound irradiation time and temperature were investigated.•Response surface methodology used to optimize parameters and study combined effects.•Experiment...

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Bibliographic Details
Published in:Food chemistry 2017-02, Vol.217, p.552-559
Main Authors: Xu, Dong-Ping, Zheng, Jie, Zhou, Yue, Li, Ya, Li, Sha, Li, Hua-Bin
Format: Article
Language:English
Subjects:
Antioxidant
Antioxidants - analysis
Ethanol - chemistry
Flower
Flowers - chemistry
Limonium sinuatum
Plant Extracts - analysis
Plumbaginaceae - chemistry
Polyphenols - analysis
Reproducibility of Results
Solvents
Ultrasonics
Ultrasound-assisted extraction
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Summary:•Ultrasound-assisted extraction of natural antioxidants from the flowers of Limonium sinuatum.•Ethanol concentration, solvent/material ratio, ultrasound irradiation time and temperature were investigated.•Response surface methodology used to optimize parameters and study combined effects.•Experimental values obtained were compared against conventional maceration and Soxhlet extraction methods.•The UAE method is more efficient for antioxidant extraction. Natural antioxidants are widely used as dietary supplements or food additives. An optimized method of ultrasound-assisted extraction (UAE) was proposed for the effective extraction of antioxidants from the flowers of Limonium sinuatum and evaluated by response surface methodology. In this study, ethanol concentration, ratio of solvent to solid, ultrasonication time and temperature were investigated and optimized using a central composite rotatable design. The optimum extraction conditions were as follows: ethanol concentration, 60%; ratio of solvent to solid, 56.9:1mL/g; ultrasonication time, 9.8min; and temperature, 40°C. Under the optimal UAE conditions, the experimental values (483.01±15.39μmolTrolox/gDW) matched with those predicted (494.13μmolTrolox/gDW) within a 95% confidence level. In addition, the antioxidant activities of UAE were compared with those of conventional maceration and Soxhlet extraction methods, and the ultrasound-assisted extraction could give higher yield of antioxidants and markedly reduce the extraction time.
ISSN:0308-8146
1873-7072
DOI:10.1016/j.foodchem.2016.09.013