PMID- 30503697 OWN - NLM STAT- MEDLINE DCOM- 20190510 LR - 20190510 IS - 1873-3778 (Electronic) IS - 0021-9673 (Linking) VI - 1591 DP - 2019 Apr 26 TI - Graphene oxide-starch-based micro-solid phase extraction of antibiotic residues from milk samples. PG - 7-14 LID - S0021-9673(18)31494-8 [pii] LID - 10.1016/j.chroma.2018.11.069 [doi] AB - In this study, a method was described for the extraction of three antibiotic residues from cow milk samples using a graphene oxide-starch-based nanocomposite. The prepared nanocomposites were employed as an extractive phase for micro-solid phase extraction of antibiotics from cow milk samples. The extracted antibiotics, i.e. amoxicillin, ampicillin and cloxacillin, were subsequently analyzed by high-performance liquid chromatography-ultraviolet detection (HPLC-UV). Important variables associated with the extraction and desorption efficiency were optimized. High extraction efficiencies for the selected antibiotics were conveniently achieved using the starch-based nanocomposite as the extractive phase. The developed method was validated according to the European Commission Decision 2002/657/EC by spiking the selected antibiotics to the blank milk samples. The limits of quantitation (2.7-5.0 mug kg(-1)) were calculated for the selected penicillin group in milk samples and their quantities are lower than the maximum residue limits (MRLs). The obtained results indicate the remarkable efficiency of the graphene oxide-starch-based nanocomposite performance toward the selected antibiotics. The relative standard deviations of intra and inter-day analysis are less than 3.3 and 6.1%, respectively. Moreover, trueness of method was successfully accomplished via the recovery assays (88-102%) in the fortified blank milk samples with three different concentration levels (MRL, 1.5 MRL and 3 MRL mug kg(-1)). In overall, the proposed method was a promising alternative for analysis of selected three antibiotics in variety milk samples, due to the effective and easy-to-perform method and acceptable relative recovery in the range 83-105%. CI - Copyright (c) 2018 Elsevier B.V. All rights reserved. FAU - Golzari Aqda, Tahereh AU - Golzari Aqda T AD - Environmental and Bio-Analytical Laboratories, Department of Chemistry Sharif University of Technology, P.O. Box 11365-9516, Tehran, Iran. FAU - Behkami, Shima AU - Behkami S AD - Environmental and Bio-Analytical Laboratories, Department of Chemistry Sharif University of Technology, P.O. Box 11365-9516, Tehran, Iran. FAU - Raoofi, Mehrnoosh AU - Raoofi M AD - Environmental and Bio-Analytical Laboratories, Department of Chemistry Sharif University of Technology, P.O. Box 11365-9516, Tehran, Iran. FAU - Bagheri, Habib AU - Bagheri H AD - Environmental and Bio-Analytical Laboratories, Department of Chemistry Sharif University of Technology, P.O. Box 11365-9516, Tehran, Iran. Electronic address: bagheri@sharif.edu. LA - eng PT - Journal Article DEP - 20181126 PL - Netherlands TA - J Chromatogr A JT - Journal of chromatography. A JID - 9318488 RN - 0 (Anti-Bacterial Agents) RN - 0 (graphene oxide) RN - 7782-42-5 (Graphite) RN - 9005-25-8 (Starch) SB - IM MH - Animals MH - Anti-Bacterial Agents/analysis/*isolation & purification MH - Cattle MH - Female MH - Graphite/*chemistry MH - Milk/*chemistry MH - Reproducibility of Results MH - Solid Phase Microextraction/*methods MH - Spectroscopy, Fourier Transform Infrared MH - Starch/*chemistry OTO - NOTNLM OT - Antibiotics OT - Graphene oxide-starch-based nanocomposite OT - HPLC-UV OT - Micro-solid phase extraction OT - Milk analysis EDAT- 2018/12/07 06:00 MHDA- 2019/05/11 06:00 CRDT- 2018/12/04 06:00 PHST- 2018/10/06 00:00 [received] PHST- 2018/11/21 00:00 [revised] PHST- 2018/11/24 00:00 [accepted] PHST- 2018/12/07 06:00 [pubmed] PHST- 2019/05/11 06:00 [medline] PHST- 2018/12/04 06:00 [entrez] AID - S0021-9673(18)31494-8 [pii] AID - 10.1016/j.chroma.2018.11.069 [doi] PST - ppublish SO - J Chromatogr A. 2019 Apr 26;1591:7-14. doi: 10.1016/j.chroma.2018.11.069. Epub 2018 Nov 26.