Microbiological quality and safety of raw and pasteurized milk marketed in and around Nairobi region
| Autor: | P. M. Kutima, Julius Maina Mathara, F. M. Mathooko, George W. Wanjala |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
business.industry
010401 analytical chemistry 0402 animal and dairy science food and beverages Pasteurization Cold storage Titratable acid Total Viable Count 04 agricultural and veterinary sciences Raw milk 040201 dairy & animal science 01 natural sciences 0104 chemical sciences law.invention Coliform bacteria fluids and secretions Most probable number law Medicine Food science business Marketed milk quality acidity total viable count coliforms enterobacteriaceae Staphylococcus aureus Food contaminant |
| Zdroj: | African Journal of Food, Agriculture, Nutrition and Development; Vol 17, No 1 (2017); 11518-11532 |
| ISSN: | 1684-5374 1684-5358 |
| DOI: | 10.18697/ajfand.77.15320 |
| Popis: | The microbiological quality of raw and pasteurized milk marketed in Nairobi and its environs was determined. Milk samples were collected randomly at milk selling points from three market areas: rural (Kiambu/Ngong), urban (East/West of Tom Mboya street) and slum (Kibera/Mathare). Samples were analysed for titratable acidity, total viable count (TVC), Staphylococcus aureus, coliforms and Enterobacteriaceae. Titratable acidity was determined using titration method, while TVC, S. aureus and Enterobacteriaceae were determined by the spread plate methods and coliforms were determined by most probable number. Data collected were subjected to analysis of variance using Genstat statistical package. The mean acidity was 0.20% lactic acid (LA), while mean counts for TVC, S. aureus , coliforms and Enterobacteriaceae were 6.05, 3.46, 2.30, and 3.93 log10cfu/ml, respectively. The ercentage of milk samples with acidity values greater than 0.18% LA, the upper limit set by Kenya Bureau of Standards (KEBS), was 52.8 %. Total viable count (TVC) greater than 106 cfu/ml, was detected in 95.2% and 21.4% of raw and pasteurized milk, respectively. Coliform counts greater than 4.70 and 1.0 log10cfu/ml for raw and pasteurized milk were detected in 77.8% and 4.8%, respectively of raw and pasteurized milk samples collected. Enterobacteriaceae and S. aureus were detected with mean counts ranging from 6.08-6.86 and 5.82-6.32 log10/ml, respectively. Highest mean acidity and counts were recorded from slum areas of Nairobi and there were significant differences between raw and pasteurized milk (P |
| Databáze: | OpenAIRE |
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