Comparison of Locally Available Walnuts Based on Proximate Analysis and Selected Mineral Content

Abstract

Walnut is the bullion of Pakistan. These are used as delicious nuts in cuisine. The objective of the study was proximate analysis (moisture content and ash content) and determination of toxic metals (Cadmium, lead, nickel and iron) of ten different walnut samples collected from three different locations in Lahore (Aik Moria Pull, Mall Road, Hyper Star Fortress Stadium) to determine the quality and to compare the metal profile. The heavy metals were assessed using atomic absorption spectrometer prior to wet acid digestion. The results of proximate analysis showed the ranges for moisture content 2.80− 3.29 % and ash content 1.49 – 8.64 %. The results of the trace elements detection indicated the concentrations for Cadmium 0.009 – 3.873 mg/kg, Iron 1.483 – 4.163 mg/kg, Nickel 0.980 – 2.634 mg/kg and Lead was not detected (BDL). The results revealed that all the nuts are not polluted with heavy metals as concentration of Cd, Pb, Ni and Fe are within permissible limit described by WHO. So, these nuts are safe for public consumption.