Novel amide- and imide-co-polymers modified with sulfathiazole as efficient chelator for selective extraction, pre-concentration and determination of trace inorganic antimony (as Sb(III)) from edible vegetable oils by ultrasound assisted-cloud point extraction coupled to micro-volume UV-spectrophotometry

ZENGİN H., GÜRKAN R.

JOURNAL OF FOOD COMPOSITION AND ANALYSIS, cilt.115, 2023 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 115
  • Basım Tarihi: 2023
  • Doi Numarası: 10.1016/j.jfca.2022.104931
  • Dergi Adı: JOURNAL OF FOOD COMPOSITION AND ANALYSIS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Analytical Abstracts, BIOSIS, Biotechnology Research Abstracts, CAB Abstracts, Food Science & Technology Abstracts, Veterinary Science Database
  • Anahtar Kelimeler: Sb(III), Poly(styrene-co-maleic anhydride), Sulfathiazole, Sodium dodecyl sulfate, Cetyltrimethylammonium bromide, Edible vegetable oils, Pre-concentration, Ultrasound assisted-cloud point extraction, Micro-volume UV spectrophotometry, SOLID-PHASE EXTRACTION, ATOMIC-ABSORPTION-SPECTROMETRY, LIQUID-LIQUID-EXTRACTION, SPECIATION ANALYSIS, IMPRINTED POLYMER, PET CONTAINERS, WATER SAMPLES, OLIVE OIL, FOOD, MICROEXTRACTION
  • Sivas Cumhuriyet Üniversitesi Adresli: Evet

Özet

The study described the synthesis, characterization, and application of newly prepared sulfathiazole-modified amide/imide co-polymers for the extraction of trace Sb(III) from edible vegetable oils. The method was based on the pH-dependent complexation between Sb(III) and chelators as a result of charge transfer via tautomeri-zation in presence of the mixed ionic surfactants in 5%(v/v) 2-propanol, 1:1, v/v) at pH 2.0 and 8.0, respectively for amide and imide copolymers and then selectively ultrasound assisted-cloud point extraction of the Sb(III)-complexes into the micellar phase of extractant. The separated micellar phase by centrifugation was diluted to 0.4 mL with tetrahydrofuran, and detected at 269 nm by micro-volume UV-spectrophotometry. The parameters affecting extraction efficiency were optimized. The optimal extraction conditions were found to be: 0.6/0.8 mmol L-1 of McIlvaine buffer, 30 mu mol L-1 of the mixed-ionic surfactant mixture, 120 mu mol L-1 KCl, 0.1/0.06% (v/v) of the nonionic surfactant and (0.4/0.2)x 10-3%(w/v) of sulfathiazole-modified amide/imide copolymers at pH 2.0 and 8.0 for 7 min at 40 degrees C in an ultrasonic bath (40 kHz, 300 W). From preconcentration of 20-mL sample, the good linear relationships (r2 >= 0.995) between absorbance and Sb(III) concentration were ob-tained from calibration curves prepared in solvent in range of 1-40 and 1-62.5 mu g L-1 with the method detection limits of 0.30/0.47 and 0.51/0.51 mu g L-1 at 269 nm by spectrophotometer after 50-fold pre-concentration. The accuracy was statistically verified by analysis of a non-certified sample with and without spiking where the precision and relative recoveries are within 5-12% and 83-92%, respectively. Also, the matrix effect was evaluated by triplicate measurements of 25 mu g L-1 Sb(III) (n: 3) under optimal conditions. The method was successfully applied into the analysis of total iSb levels of edible vegetable oils. The results shown that the STZ-modified amide/imide co-polymers were efficient selective chelators even in presence of 50-fold excess Sb(V), and exhibited great potential as alternative binding chelators for the extraction of Sb(III) from edible vegetable oils.