Abstract
Brevibacterium celere C-924 is a microorganism whose nematicidal activity has been demonstrated, through which powder formulations (HeberNem-S) have been obtained for application in protected cultivation houses. The objective of this work was to carry out sieving studies to determine the factors and additives that most influence the wettability of the HeberNem-S product during the spray-drying operation. A response surface experiment was elaborated where the following factors were evaluated: sucrose concentration, soluble solids of the exhausted fermentation medium, synchronous speed of the atomizing disc and the dry matter of the cream formulated on the wettability of the HeberNem-S product. The results of the experiment showed that the variable that most influences the wettability of the powder is the concentration of soluble solids from the spent fermentation medium that is added in the formulation. Based on these obtained results, the influence of 16 additives was evaluated, among which are sugars, gums, detergents and surfactants. It was determined that the additives that most influence wettability are soy lecithin and Glanapon, achieving a reduction in the wettability time of 19.18 times and 17.5 times, respectively. The result obtained is of vital importance for subsequent studies to optimize the composition of HeberNem-S, in order to guarantee continuous improvements in the production process and the physical properties of the powder.
Keywords: Additives, Glanapon, Wettability, Soy Lecithin, Spray Drying, Brevibacterium celere C-924.
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