Microbiological quality of different tea grades produced in diverse agro-climatic regions in Sri Lanka
In Sri Lanka, several tea grades are produced in factories located in different agro-climatic regions within three geographical elevations. The study aimed to determine the microbial quality of different tea grades and composite tea samples obtained from factories situated at diverse locations. The...
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| Format: | Article |
| Language: | English |
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Elsevier
2024-03-01
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| Series: | Heliyon |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2405844024039094 |
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| author | S.H.S. Karunaratne G.A.S.I. Abeygunawardena D.L. Jayaratne G.A.S. Premakumara |
| author_facet | S.H.S. Karunaratne G.A.S.I. Abeygunawardena D.L. Jayaratne G.A.S. Premakumara |
| author_sort | S.H.S. Karunaratne |
| collection | DOAJ |
| description | In Sri Lanka, several tea grades are produced in factories located in different agro-climatic regions within three geographical elevations. The study aimed to determine the microbial quality of different tea grades and composite tea samples obtained from factories situated at diverse locations. The average APC, yeast & mould counts and coliforms in different tea grades ranged from 3.4 × 103 to 2.0 × 104 cfu/g, 4.8 × 102 to 2.5 × 103 cfu/g and 0.005 to 3.9 × 101 Most Probable Number (MPN)/g respectively. The tea samples collected from different factories had mean values of APC and yeast & mould as 5.3 × 103±1.3 × 103 cfu/g and 9.7 × 102±1.9 × 102 cfu/g. Escherichia coli (E.coli) and Salmonella were not detected either in tea grades or in composite samples. The identified microorganisms in tea samples belong to phyla Firmicutes, Proteobacteria, Ascomycota, Basidiomycota and Zygomycota.The samples collected from the mid country elevation had the highest counts of APC and yeast & mould counts were high in the low country elevation. More than 70 % of the tested samples comply with the SLTB guidelines given for the microbiological quality of black tea. The distribution of bacterial, yeast and mould and coliform densities of tea were significantly variable with respect to geographic areas. |
| first_indexed | 2024-04-24T13:48:59Z |
| format | Article |
| id | doaj.art-2053d047687846ad80606e06b2f87d5b |
| institution | Directory Open Access Journal |
| issn | 2405-8440 |
| language | English |
| last_indexed | 2024-04-24T13:48:59Z |
| publishDate | 2024-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Heliyon |
| spelling | doaj.art-2053d047687846ad80606e06b2f87d5b2024-04-04T05:06:13ZengElsevierHeliyon2405-84402024-03-01106e27878Microbiological quality of different tea grades produced in diverse agro-climatic regions in Sri LankaS.H.S. Karunaratne0G.A.S.I. Abeygunawardena1D.L. Jayaratne2G.A.S. Premakumara3Industrial Technology Institute, 363, Bauddhaloka Mawatha, Colombo 07, Sri Lanka; Corresponding author.Department of Microbiology, Faculty of Science, University of Kelaniya, Sri LankaDepartment of Microbiology, Faculty of Science, University of Kelaniya, Sri LankaDepartment of Basic Sciences & Social Science, Faculty of Nursing, University of Colombo, Sri LankaIn Sri Lanka, several tea grades are produced in factories located in different agro-climatic regions within three geographical elevations. The study aimed to determine the microbial quality of different tea grades and composite tea samples obtained from factories situated at diverse locations. The average APC, yeast & mould counts and coliforms in different tea grades ranged from 3.4 × 103 to 2.0 × 104 cfu/g, 4.8 × 102 to 2.5 × 103 cfu/g and 0.005 to 3.9 × 101 Most Probable Number (MPN)/g respectively. The tea samples collected from different factories had mean values of APC and yeast & mould as 5.3 × 103±1.3 × 103 cfu/g and 9.7 × 102±1.9 × 102 cfu/g. Escherichia coli (E.coli) and Salmonella were not detected either in tea grades or in composite samples. The identified microorganisms in tea samples belong to phyla Firmicutes, Proteobacteria, Ascomycota, Basidiomycota and Zygomycota.The samples collected from the mid country elevation had the highest counts of APC and yeast & mould counts were high in the low country elevation. More than 70 % of the tested samples comply with the SLTB guidelines given for the microbiological quality of black tea. The distribution of bacterial, yeast and mould and coliform densities of tea were significantly variable with respect to geographic areas.http://www.sciencedirect.com/science/article/pii/S2405844024039094Black teaTea gradesMicrobial qualityAgro climatic regionsElevations |
| spellingShingle | S.H.S. Karunaratne G.A.S.I. Abeygunawardena D.L. Jayaratne G.A.S. Premakumara Microbiological quality of different tea grades produced in diverse agro-climatic regions in Sri Lanka Heliyon Black tea Tea grades Microbial quality Agro climatic regions Elevations |
| title | Microbiological quality of different tea grades produced in diverse agro-climatic regions in Sri Lanka |
| title_full | Microbiological quality of different tea grades produced in diverse agro-climatic regions in Sri Lanka |
| title_fullStr | Microbiological quality of different tea grades produced in diverse agro-climatic regions in Sri Lanka |
| title_full_unstemmed | Microbiological quality of different tea grades produced in diverse agro-climatic regions in Sri Lanka |
| title_short | Microbiological quality of different tea grades produced in diverse agro-climatic regions in Sri Lanka |
| title_sort | microbiological quality of different tea grades produced in diverse agro climatic regions in sri lanka |
| topic | Black tea Tea grades Microbial quality Agro climatic regions Elevations |
| url | http://www.sciencedirect.com/science/article/pii/S2405844024039094 |
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