4.7 Article

Enhancement of ultrasound-assisted extraction of sulforaphane from broccoli seeds via the application of microwave pretreatment

Journal

ULTRASONICS SONOCHEMISTRY
Volume 87, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.ultsonch.2022.106061

Keywords

Sulforaphane; Broccoli seeds; Microwave pretreatment; Simultaneous hydrolysis and extraction; Ultrasonic-assisted extraction

Funding

  1. National Natural Science Founda-tion of China [31801457]
  2. Postgraduate Innovation Program of Qingdao Agricultural University [QNYCX21080]

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This study used microwave pretreatment and grinding treatment to enhance sulforaphane formation, and applied ultrasonic-assisted extraction (UAE) to extract sulforaphane using simultaneous hydrolysis and extraction method. The results showed that simultaneous hydrolysis and extraction significantly increased the extraction rate of sulforaphane compared to hydrolysis followed by extraction. UAE method was effective in extracting sulforaphane from broccoli seeds, resulting in higher yield in a shorter extraction time.
In this study, microwave pretreatment and grinding treatment were used to enhance sulforaphane formation, then ultrasonic-assisted extraction (UAE) was applied to extract sulforaphane using simultaneous hydrolysis and extraction method. The effects of various parameters, which were ultrasonic time, ultrasonic power, solid-water ratio and solid-ethyl acetate ratio on the extraction rate of sulforaphane were investigated. The results showed that microwave pretreatment enhanced sulforaphane formation. Excessive size reduction did not increase or even reduced extraction rate of sulforaphane. Simultaneous hydrolysis and extraction significantly increased extraction rate of sulforaphane compared to hydrolysis followed by extraction. UAE accelerated mass transfer and the solubilization of the targeted compounds due to the acoustic cavitation effect, thus enhanced enzymatic hydrolysis of glucoraphanin and the extraction rate of sulforaphane. The extraction rate of sulforaphane using UAE with simultaneous hydrolysis and extraction was 4.07-fold of the conventional extraction method. UAE was an effective method to extract sulforaphane from broccoli seeds since it led to higher yield of sulforaphane in a much shorter extraction time.

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