title: Preparation of sulfonated graphene/polypyrrole solid-phase microextraction coating by in situ electrochemical polymerization for analysis of trace terpenes.
abstract: In this study, a novel sulfonated graphene/polypyrrole (SG/PPy) solid-phase microextraction (SPME) coating was prepared and fabricated on a stainless-steel wire by a one-step in situ electrochemical polymerization method. Crucial preparation conditions were optimized as polymerization time of 15min and SG doping amount of 1.5mg/mL. SG/PPy coating showed excellent thermal stability and mechanical durability with a long lifespan of more than 200 stable replicate extractions. SG/PPy coating demonstrated higher extraction selectivity and capacity to volatile terpenes than commonly-used commercial coatings. Finally, SG/PPy coating was practically applied for the analysis of volatile components from star anise and fennel samples. The majority of volatile components identified were terpenes, which suggested the ultra-high extraction selectivity of SG/PPy coating to terpenes during real analytical projects. Four typical volatile terpenes were further quantified to be 0.2-27.4μg/g from star anise samples with good recoveries of 76.4-97.8% and 0.1-1.6μg/g from fennel samples with good recoveries of 80.0-93.1%, respectively.
authors.affiliation: School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, China; Department of Pharmacy, Zunyi Medical College, Zunyi 563000, China.
authors.forename: Chengjiang
authors.initials: C
authors.lastname: Zhang
authors.affiliation: School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, China. Electronic address: zzm@mail.sysu.edu.cn.
authors.forename: Zhuomin
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, China. Electronic address: cesgkl@mail.sysu.edu.cn.
authors.forename: Gongke
authors.initials: G
authors.lastname: Li
mesh_terms: D055664:Electrochemical Techniques; D005524:Food Technology / Q000379:methods*; D006108:Graphite / Q000737:chemistry*; D058105:Polymerization; D011108:Polymers / Q000737:chemistry*; D011758:Pyrroles / Q000737:chemistry*; D052617:Solid Phase Microextraction; D017365:Spices / Q000032:analysis*; D013193:Stainless Steel / Q000737:chemistry; D013729:Terpenes / Q000032:analysis*
chemical_list: D011108:Polymers; D011758:Pyrroles; D013729:Terpenes; D013193:Stainless Steel; C067635:polypyrrole; D006108:Graphite
keywords: Electrochemical polymerization; SG/PPy; SPME coating; Star anise and fennel; Terpenes