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 0.09ngg−1 and 0.03ngg−1, respectively, while the quantification limits were 0.28ngg−1 and 0.08ngg−1, respectively. The recoveries of OTA of coffee and cereal spiked at 0.5, 10 and 25ngg−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 9.33ngg−1. [Copyright &y& Elsevier]