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- W2317998715 abstract "Abstract In a study made on plantations in Malaya, it was found that the cause of instability is not the same for both fresh and preserved latex. The autocoagulation of fresh latex, as it will be shown, is not caused by the acid formed by bacterial action on the serum components (autoacidification). Coagulation takes place, in fact, when decomposition of the serum components is prevented by the addition of strong antiseptics. These experiments, carried out in 1938 and 1939 in Malaya, support Whitby's view that autocoagulation is not due to autoacidification, but is probably caused by enzyme action on the protein or other serum components of the latex. The behavior of preserved latex is entirely different. Coagulation on storage was found to be due to acid formation and neutralization of the preserving agent applied. Decomposition of serum components was found in cases when coagulation did not take place, which would naturally influence the further behavior of latex. The action of the preserving agents is not a simple one. Inhibiting bacterial growth and preventing decomposition are not enough to keep the latex in the liquid, colloidal state. In addition to antiseptics, chemical compounds which act specifically as coagulation preventatives must be present. Rhodes recommends 0.1 per cent ammonia in addition to sodium pentachlorophenate. This small quantity of ammonia, as it was found, is the specific substance, probably an enzyme poison, which prevents coagulation. A number of additional substances in combination with sodium pentachlorophenate were tried, and it was found that adjusting the hydrogen ion concentration on the alkali side was not sufficient to prevent coagulation, although bacterial decomposition was inhibited. Observing the changes in the specific conductivity of latex during storage was the most satisfactory method found to measure the value of preserving agents or combinations of preserving agents. An increase in the specific conductivity of latex was found after a few days' storage, provided that the preserving agent did not inhibit decomposition of the serum components. From this increase in conductivity on storage, it could be predicted whether or not the preserving agent tested would give satisfactory results, or whether or not the concentration of the preserving agent was sufficiently high." @default.
- W2317998715 created "2016-06-24" @default.
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- W2317998715 date "1941-03-01" @default.
- W2317998715 modified "2023-09-26" @default.
- W2317998715 title "The Instability of Hevea Latex" @default.
- W2317998715 doi "https://doi.org/10.5254/1.3540002" @default.
- W2317998715 hasPublicationYear "1941" @default.
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