title: A new graphene oxide/polypyrrole foam material with pipette-tip solid-phase extraction for determination of three auxins in papaya juice.
abstract: A new material, graphene oxide/polypyrrole (GO/Ppy), was synthesized by mixing graphene oxide and polypyrrole in a specific proportion. It possesses a unique structure similar to that of foam. A homemade pipette-tip solid-phase extraction (PT-SPE) device, which is more simple and convenient than traditional devices, was used for saving reagents and operation time. When GO/Ppy was used as the adsorbent of PT-SPE for determining three auxins (indole-3-propionic acid, indole-3-butyric acid, and 1-naphthaleneacetic acid) present in trace amounts in papaya juice, it showed high affinity and adsorption capacity for all the three auxins. GO/Ppy-PT-SPE also had a significant capacity for eliminating the interferences from the papaya juice matrix. Under optimized conditions, a good linearity of auxins was obtained in the range 16.3-812.5 ng g(-1); the average recoveries at the three spiked levels of the three auxins ranged from 89.4% to 105.6% with the relative standard deviations ≤ 3.0%. Meanwhile, six papaya juice samples with different growth stages were analyzed under optimum conditions, and trace auxins in the range 18.3-100.6 ng g(-1) were observed. Because of its high selectivity, simplicity, and reliability, the GO/Ppy-PT-SPE method developed herein can be potentially applied for determining trace auxins in complex biological samples.
authors.affiliation: Key Laboratory of Pharmaceutical Quality Control of Hebei Province & College of Pharmacy, Hebei University, Baoding 071002, China; Key Laboratory of Medicinal Chemistry and Molecular Diagnosis, Ministry of Education, Hebei University, Baoding 071002, China.
authors.forename: Lihui
authors.initials: L
authors.lastname: Wang
authors.affiliation: Key Laboratory of Pharmaceutical Quality Control of Hebei Province & College of Pharmacy, Hebei University, Baoding 071002, China; Key Laboratory of Medicinal Chemistry and Molecular Diagnosis, Ministry of Education, Hebei University, Baoding 071002, China.
authors.forename: Mingyu
authors.initials: M
authors.lastname: Wang
authors.affiliation: Key Laboratory of Pharmaceutical Quality Control of Hebei Province & College of Pharmacy, Hebei University, Baoding 071002, China; Key Laboratory of Medicinal Chemistry and Molecular Diagnosis, Ministry of Education, Hebei University, Baoding 071002, China. Electronic address: yanhy@hbu.edu.cn.
authors.forename: Hongyuan
authors.initials: H
authors.lastname: Yan
authors.affiliation: Key Laboratory of Pharmaceutical Quality Control of Hebei Province & College of Pharmacy, Hebei University, Baoding 071002, China; Key Laboratory of Medicinal Chemistry and Molecular Diagnosis, Ministry of Education, Hebei University, Baoding 071002, China.
authors.forename: Yanan
authors.initials: Y
authors.lastname: Yuan
authors.affiliation: Key Laboratory of Pharmaceutical Quality Control of Hebei Province & College of Pharmacy, Hebei University, Baoding 071002, China; Key Laboratory of Medicinal Chemistry and Molecular Diagnosis, Ministry of Education, Hebei University, Baoding 071002, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Tian
mesh_terms: D000327:Adsorption; D029441:Carica / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry; D007210:Indoleacetic Acids / Q000032:analysis*; D007211:Indoles / Q000032:analysis*; D009280:Naphthaleneacetic Acids / Q000032:analysis*; D010087:Oxides / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D011758:Pyrroles / Q000737:chemistry*; D015203:Reproducibility of Results; D052616:Solid Phase Extraction / Q000379:methods*
chemical_list: D007210:Indoleacetic Acids; D007211:Indoles; D009280:Naphthaleneacetic Acids; D010087:Oxides; D011108:Polymers; D011758:Pyrroles; C014612:indolebutyric acid; C067635:polypyrrole; C034182:1-naphthaleneacetic acid; D006108:Graphite; C015292:indolepropionic acid
keywords: Auxins; Graphene oxide/polypyrrole adsorbent; Papaya juice; Pipette-tip solid-phase extraction