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Self-functionalized carbon dots (CDs) were prepared from ethanolic shallot extract to obtain a total phenolic precursor.

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In this study, the influence of surfactants (SDS, TX100 and CTAB) to modify surface polarity of graphene oxide adsorbent is proposed for the extraction of β-carotene and total carotenoids from fruit juice samples.

This paper reviews the use of a well-known graphene oxide (GO) as an adsorbent in solid phase extraction (SPE) of plant pigments like β-carotene and other dye contaminants under optimum conditions. Numerous researches had investigated the influence of some surfactants and oils, in particular typically including sodium dodecyl sulfate (SDS), polyethylene glycol p-(1,1,3,3-tetramethylbutyl)-phenyl ether (TX100) and hexadecyltrimethylammonium bromide (CTAB) as auxiliary agents to link in and then modify the polarity of the surface charge of GO. The applicability of SPE based on SDS-GO, TX100-GO and CTAB-GO in real samples was compiled and discussed. The surfactant/oil-surface charge decoration of the GO sorbents for rapid SPE can thus be a potential and suitable candidate for the selective procedure of dispersive solid-phase microextraction of total carotenoids and/or contaminated synthetic dyes from vegetables, fruits or food products.