Abstract:
The objective of this research was to study type and amount of microorganisms and contaminants contained in fruit juice. Eighty samples of 5 fruit juices such as: orange juice, juice, lemon juice, longan juice, coconut juice and rosella juice were collected (6times) from 4 shops in the Rajamangala Institute Technology cafeteria Pathumthani campus during February 2000 to January 2001. Eighty of fruit juices were examined microbiological including pathogenic bacteria and the risk of indicator microorganisms: total plate count, yeast and fungi, E. coli, Salmonella sp., Staphylococcus aureus and coliform bacteria. Twenty four of fruit juices were also analyzed chemical qualities: benzoic acid and total sulphur dioxide. Chemical data such as: benzoic acid found that all samples gave within acceptable limits, but total sulphur dioxide values revealed that gave lower standard limits. Microbiological data showed that whole fruit juices i.e. orange juice, lemon juice and coconut juice were contaminated with yeast and fungi at the highest values. (100.00%) The pathogenic bacteria and risk of indicator microorganisms such as: E. coli, Staphylococcus aureus and Salmonella sp. Were found in all samples obtained up to 100.00%.The range of coliform (2.2) showed maximum values (95.00%) in lemon juice. From above results, indicated that improper sanitation processing steps. However, they must be to solve occurred problems for improvement better food qualities under the standard regulation limitations.