Microwave Assisted Extraction of Defatted Roselle (Hibiscus sabdariffa L.) Seed at Subcritical Conditions with Statistical Analysis
Roselle seeds are the waste product of roselle processing, but they are now labeled as a polyphenol source with great herbal quality. In this work, polyphenols were extracted using ethanol-water (70% (v/v)) in a closed vessel under microwave irradiation. The main objective was to determine the opt...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Hindawi Publishing Corporation
2017
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| Subjects: | |
| Online Access: | http://eprints.usm.my/37075/1/%28Microwave_Assisted_Extraction%29_5232458.pdf http://eprints.usm.my/37075/ https://doi.org/10.1155/2017/5232458 |
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| Institution: | Universiti Sains Malaysia |
| Language: | English |
| Summary: | Roselle seeds are the waste product of roselle processing, but they are now labeled as a polyphenol source with great herbal quality.
In this work, polyphenols were extracted using ethanol-water (70% (v/v)) in a closed vessel under microwave irradiation. The main
objective was to determine the optimal parameters statistically. The influence of extraction time (4–10 min), microwave power
(100–300 W), and solvent/solid ratio (25–100 mL/g) was studied. The total phenolic and flavonoids content were determined using
Folin-Ciocalteu and aluminum chloride methods, respectively.Without temperature control, the subcritical conditions could occur
and the highest flavonoid content (14.4251mg QE/g) was achieved at 158∘C and 16.4 bar. Although the optimum MAE conditions
(10 min, 300W, and 97.7178 mL/g) resulted in the highest yield (65.0367%) and phenolic content (18.2244mgGAE/g), lowflavonoids
content (6.4524mg QE/g) was unexpectedly obtained due to degradation at 163∘C. |
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