MICROBIOLOGICAL AND CHEMICAL CHARACTERISTICS OF SOME SUDANESE STREET FOODS

Abstract

Samples of street food were collected from different sources in Khartoum state. The samples were Shawerma, Tamia, ice cream and peanut butter. The main goal of this research was to study the safety aspects of these foods. Microbial and the chemical characteristics were evaluated. Analyses were carried out at central lab of Faculty of Agric. University of Khartoum and Central petroleum laboratories. The total bacterial count(cfu/g) in Shawerma was 5.3x103 in Albait Alsory samples and 8.4x103in the sample collected from the College of Agricultural studies college and 5.3x104in the sample collected from Omdourman market. Coliforms count(MPN/100g)found to be nil ,16.7 and 26.0 in Albait Alsory ,College of Agricultural Studies and Omdurman market, respectively .The sample of college of Agriculture Studies were found to be highly contaminated by total bacterial count and moulds and yeasts compared to other two sources. On the other hand Omdurman sample were found to be highly contaminated with coliforms. The bacterial count in Tamia was 5.6x103 in Albeit Alsory samples and 3.9x104in the sample from the Agricultural College and 4.9x103 in the sample from Omdurman . Coliforms and moulds and yeasts in the Tamia samples were not detected in Albait Alsory and College samples, while Omdurman market samples recorded 1.7x10 and 5.8x 102, respectively ,also the microbial count in ice cream was 5.9x104 in the factory ice cream and 3.6x103 in Almazalat ice cream and5.9x104 in the home made ice cream. The factory ice cream and Almazalat ice cream were free of E.coli, Salmonella spp and Staph.aureus, but the samples from the home made ice cream were free from E. coli and positive for Salmonela spp and Staph. aureus .The bacterial count in peanut butter was 5.4x10 3in the sample collected from Almarkazi (Shambat) and 5.6x104 in the samples collected from the crusher and 6.4x104in the samples collected from Omdurman market. The vii coliforms and moulds and yeasts were not detected in Albait Alsory and College samples while Omdurman sample recorded 1.7×10 and 5.8×102(cfu/g), respectively. The lead level (ppb) in Shawerma collected from Albait Alsory was 24.84 and 2.90 in the samples collected from the College of Agric and -0.22 in the samples collected from Omdourman market. The lead in ice cream was 5.10 in the samples collected from Almazalt and 8.32 in the samples collected from the factory and.0.26 in the samples of the home made ice cream. Lead in Tamia was 3.04 in the samples collected from Albait Alsory and 3.98 in the samples collected from the College and 0.20 in the samples collected from Omdorman market .Lead in peanut butter was 3.20 in the samples collected from Almarkzi (Shambat) and 3.90 in the samples collected from the crusher and 0.16 in the samples collected from Omdourman market. The Aluminum level (ppm) in Shawerma collected from Albait Alsory was 1.37 and <0.30 in the sample collected from the College and 1.75in the samples collected from Omdorman market. The aluminum in ice cream was 3.5 in the samples collected from Almazalt and <0.30 in the samples collected from the factory and <0.30 in the samples of the home made ice cream. Aluminum in Tamia was <0.30 in the samples collected from Albait Alsory and 6.16 in the sample collected from the College and 2.75 in the samples collected from Omdorman market. And aluminum in peanut butter samples was 4.11 in the samples collected from Almarkzi (Shambat) and-<0.30 in the samples collected from the crusher and 2.75 in the samples collected from Omdourman market. The peroxide value(%) in Shawerma was not detected in Albeit Alsory samples and in the samples collected from the College samples and 10 in the samples collected from Omdorman market. The peroxide value in Tamia was 4 in all the samples collected from Albait Alsory, the College and Omdorman market viii samples..The peroxide value in ice cream was also 4 in all the samples collected from the factory, Almazalat and the home made ice cream. The peroxide value in peanut butter was not detected in the samples collected from Almarkazi (Shambat) and 4 in the samples collected from the crusher and 3 in the samples collected from Omdurman market.