title: Zeolite Linde Type L as micro-solid phase extraction sorbent for the high performance liquid chromatography determination of ochratoxin A in coffee and cereal.
abstract: Zeolite Linde Type L (LTL) crystals with different length, diameter and particle size (nanosized LTL, rod LTL, cylinder LTL and needle LTL) were synthesized, characterized and were used as sorbent in the micro-solid phase extraction of ochratoxin A (OTA) before the high performance liquid chromatography detection. Under the optimized conditions, the detection limits of OTA for coffee and cereal were 0.09 ng g(-1) and 0.03 ng g(-1), respectively, while the quantification limits were 0.28 ng g(-1) and 0.08 ng g(-1), respectively. The recoveries of OTA of coffee and cereal spiked at 0.5, 10 and 25 ng g(-1) ranged from 91.7 to 101.0%. The proposed method was applied to forty-five samples of coffee and cereal. The presence of OTA was found in twenty-five samples, ranging from 0.28 to 9.33 ng g(-1).
authors.affiliation: School of Chemical Sciences, Universiti Sains Malaysia, 11800 Penang, Malaysia.
authors.forename: Tien Ping
authors.initials: TP
authors.lastname: Lee
authors.forename: Bahruddin
authors.initials: B
authors.lastname: Saad
authors.forename: Eng Poh
authors.initials: EP
authors.lastname: Ng
authors.forename: Baharuddin
authors.initials: B
authors.lastname: Salleh
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D003069:Coffee / Q000737:chemistry*; D002523:Edible Grain / Q000737:chemistry*; D057230:Limit of Detection; D008855:Microscopy, Electron, Scanning; D009793:Ochratoxins / Q000032:analysis*; D033362:Powder Diffraction; D052616:Solid Phase Extraction / Q000379:methods*; D017641:Zeolites / Q000737:chemistry*
chemical_list: D003069:Coffee; D009793:Ochratoxins; D017641:Zeolites; C025589:ochratoxin A