Evaluation of physiochemical, bacteriological and selected heavy metals of branded and unbranded groundnut oil samples collected from Galadima market of Fagge Local Government Area Kano State, Nigeria

Abstract

Aim: This study was aimed to evaluate physiochemical, bacteriological and selected heavy metals of branded and unbranded groundnut oil samples collected from Galadima market of Fagge Local Government Area Kano State Nigeria. Method and Materials: A total of five (5) samples of groundnut oil were collected and analysed for physiochemical properties such as (moisture content, iodine value, saponification value, specific gravity, density, acid value and ester value) microbiological properties such as (yeast, mould, E coli and salmonella) and some heavy metals using standard method. Results: On the physiochemical properties, the moisture content of the oil samples analysed ranged from 5.39±0.57-15.47±0.32 %. The specific gravity of the oil samples ranged from 1.48±0.02-1.50±0.01 and the specific density ranged from 0.95±0.01- 0.96±0.01. The iodne value of the samples analysed ranged from 155.13±0.31-203.52±1.21 g/100g. The saponification value of the oil samples ranged from 84.1±0.51-123±0.86 mgKoH/g. The acid values of the oil samples ranged from 1.51±0.16- 1.98±0.01 mgKmH/g. The ester value of the oil samples ranged from 82.34±0.49-121.15±0.81 mgKoH/g. On the microbiological properties, the results E coli ranged from 3-21 the analysis on yeast ranged from 4-6 for the unbranded oil samples while none was detected on the branded oil samples. Conclusion: It was concluded that most of groundnut oils have high shelve life and can be stored for a long time. In addition to good nutritional value, with all falling within the standard limit set by NAFDAC. Furthermore, it indicated that groundnut oil in general have more nutritional value and pose no significant health risk to the consumers in Kano state.