Survival of Hevea latex bacteria in the presence of a composite mixture of tetramethyl thiuram disulphide and zinc oxide

Mohd. Zin Abdul Karim, . Survival of Hevea latex bacteria in the presence of a composite mixture of tetramethyl thiuram disulphide and zinc oxide. pp. 214-220. ISSN 0127-7065

Bacterial counts of Hevea field latices treated with 0.025 TMTD/ZnO after three days storage were consistent compared to the counts of latices treated with 0.01 and 0.02 TMTD/ZnO. Treatment with 0.025 TMTD/ZnO reduced the bacterial log count of Hevea field latex to less than 1 per millilitre after fifteen days storage while 0.01 had no effect. Treatment with 0.025 TMTD/ZnO on the latex concentrate was able to inhibit the metabolic activities of the contaminated bacteria. However there was indication that contaminated bacteria in high ammonia (0.7 ammonia) latex concentrate could develop resistant to the ammonia. The predominant bacteria isolated from Hevea field latex treated with TMTD/ZnO were Streptococcus sp. Corynebacterium sp. Bacillus sp. Alcaligenes sp. Micrococcus sp. and Pseudomonas sp. Incorporation of 0.01 TMTD/ZnO completely killed Streptococcus sp. after 48 hours. For Corynebacterium sp. 0.02 TMTD/ZnO completely killed the bacterium after 24 hours. There was hardly any effect on Pseudomonas sp. even at 0.025 TMTD/ZnO.

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Abstract

Bacterial counts of Hevea field latices treated with 0.025 TMTD/ZnO after three days storage were consistent compared to the counts of latices treated with 0.01 and 0.02 TMTD/ZnO. Treatment with 0.025 TMTD/ZnO reduced the bacterial log count of Hevea field latex to less than 1 per millilitre after fifteen days storage while 0.01 had no effect. Treatment with 0.025 TMTD/ZnO on the latex concentrate was able to inhibit the metabolic activities of the contaminated bacteria. However there was indication that contaminated bacteria in high ammonia (0.7 ammonia) latex concentrate could develop resistant to the ammonia. The predominant bacteria isolated from Hevea field latex treated with TMTD/ZnO were Streptococcus sp. Corynebacterium sp. Bacillus sp. Alcaligenes sp. Micrococcus sp. and Pseudomonas sp. Incorporation of 0.01 TMTD/ZnO completely killed Streptococcus sp. after 48 hours. For Corynebacterium sp. 0.02 TMTD/ZnO completely killed the bacterium after 24 hours. There was hardly any effect on Pseudomonas sp. even at 0.025 TMTD/ZnO.

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Item Type:	Article
AGROVOC Term:	Hevea
AGROVOC Term:	Latex
AGROVOC Term:	Tmtd
AGROVOC Term:	Zinc
AGROVOC Term:	Oxides
AGROVOC Term:	Bacterial counting
AGROVOC Term:	Thiuram
AGROVOC Term:	Mixing
AGROVOC Term:	Isolation techniques
AGROVOC Term:	Isolation of microorganisms
Geographical Term:	Malaysia
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	28 Apr 2025 05:15
URI:	http://webagris.upm.edu.my/id/eprint/23265

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