Determination of Vitamin B12 and cobalt in egg yolk using vortex assisted switchable solvent based liquid phase microextraction prior to slotted quartz tube flame atomic absorption spectrometry

Tekin Z., ERARPAT S., Şahin A., Chormey D. S., BAKIRDERE S.

FOOD CHEMISTRY, cilt.286, ss.500-505, 2019 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 286
  • Basım Tarihi: 2019
  • Doi Numarası: 10.1016/j.foodchem.2019.02.036
  • Dergi Adı: FOOD CHEMISTRY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.500-505
  • Anahtar Kelimeler: Cobalt, Switchable solvent, Slotted quartz tube, Egg yolk, Vitamin B12, CLOUD POINT EXTRACTION, WATER SAMPLES, FOOD SAMPLES, PRECONCENTRATION, COPPER, IONS, NICKEL, LEAD, SOLIDIFICATION
  • Yıldız Teknik Üniversitesi Adresli: Evet

Özet

A switchable solvent based liquid phase microextraction (SS-LPME) has been proposed for the determination of cobalt in egg yolk and Vitamin B12 at trace levels. N, N-Dimethylbenzylamide (DMBA) was used as a switchable solvent and converted to protonated DMBA form by the addition of dry ice. Cobalt was complexed with 1,5-diphenylcarbazone (DPC) and extracted into the DMBA phase. After the extraction, HNO3 was added to increase nebulization efficiency of the DMBA phase. Slotted quartz tube (SQT) was combined with FAAS to enhance the detection power of the system when compared to the conventional FAAS. Under the optimum conditions, limit of detection values were recorded as 75 mu g L-1 for FAAS, 33 mu g L-1 for SQT-FAAS, 7.6 mu g L-1 for SS-LPME-FAAS, and 2.3 mu g L-1 for SS-LPME-SQT-FAAS. The developed method was applied for the determination of cobalt in egg yolk and Vitamin B12 and the recovery results were found in the range of 105-114% with 0.30-7.6 standard deviation values (n = 3).