Microwave Assisted Extraction of Defatted Roselle (Hibiscus sabdariffa L.) Seed at Subcritical Conditions with Statistical Analysis

Yusoff, N. I. and Leo, C. P. (2017) Microwave Assisted Extraction of Defatted Roselle (Hibiscus sabdariffa L.) Seed at Subcritical Conditions with Statistical Analysis. Journal of Food Quality, 2017 (523245). pp. 1-10. ISSN 0146-9428

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    Abstract

    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.

    Item Type: Article
    Subjects: T Technology > TP Chemical Technology > TP1-1185 Chemical technology
    Divisions: Kampus Kejuruteraan (Engineering Campus) > Pusat Pengajian Kejuruteraan Kimia (School of Chemical Engineering) > Article
    Depositing User: Mr Noorazilan Noordin
    Date Deposited: 12 Oct 2017 09:04
    Last Modified: 12 Oct 2017 09:04
    URI: http://eprints.usm.my/id/eprint/37075

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