Water sorption isotherms of Beauveria bassiana (Bals.) Vuill. Conidia

Silva, Roberta Z. da; Neves, Pedro M.J.; Yamashita, Fábio; Santoro, Patrícia Helena

doi:10.1590/s1519-566x2003000200023

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“…Furthermore, water activity levels and thresholds are limited to the selection of saturated salts used. Sorption isotherms generated from studies using salt solutions show poor continuity of data or limited water activity range , . Also, inconsistent responses from conidia of Beauveria bassiana stored over saturated salt solutions and hermetic storage have indicated that storage over salt solutions may be problematic for biopesticide research .…”

Section: Introductionmentioning

confidence: 99%

Interaction of Water with Three Granular Biopesticide Formulations

Lyn

Burnett

Garcia

et al. 2010

J. Agric. Food Chem.

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Two obstacles for biopesticide commercialization, long shelf life and reliable efficacy, are both affected by moisture availability. Three biopesticide delivery systems, TRE-G, PEC-G, and PESTA, were analyzed by dynamic vapor sorption analysis. The objective was to investigate the moisture sorption profile of each system in air at 25 degrees C and a relative humidity (RH) ranging from 0 to 90%. The formulations sorbed up to 12.7% moisture. In rehydrating from 0.00 to 90% RH, TRE-G and PEC-G were >or=63% and >or=58% faster than Pesta, respectively. In losing moisture from 90 to 0.00% RH, Pesta was 3.4 and 2.3 times slower than TRE-G and PEC-G, respectively. The GAB model was inadequate for describing moisture sorption, but the Young and Nelson model showed good correlation (r > 0.990) for all three formulations. Moisture distribution for all formulations was obtained. The implications of the findings as they relate to shelf life and dew period requirements of biopesticides are discussed.

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