期刊
JOURNAL OF CHROMATOGRAPHY A
卷 1368, 期 -, 页码 37-43出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2014.09.059
关键词
Graphene oxide/polypyrrole adsorbent; Pipette-tip solid-phase extraction; Auxins; Papaya juice
资金
- Natural Science Foundation of Hebei Province [B2012201052]
- Natural Science Foundation of Hebei University [2011JQ-03]
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 home-made 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. (C) 2014 Elsevier B.V. All rights reserved.
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