Determination of the structural stability of a premix powder through the critical water activity

  • Yunia Verónica García-TejedaEmail author
  • Evangelina García-Armenta
  • Juan Martín Martínez-Audelo
  • Víctor Barrera-Figueroa
Original Paper


This paper analyses the structural stability of a premix powder that consists of a mixture of whey protein isolate, soy protein isolate, sodium caseinate, carrot juice, and honey bee, which are mixed together by spray-drying. The structural stability of the powder is determined by means of its critical water activity (RHc) at 25 °C, which is determined by three different procedures, namely, by the conventional graphical method, by calculating the inflection points in the adsorption isotherms, and by digital image analysis on the powders stored at different water activities (\(0.11\le a_{w}\le 0.53\)). These three methodological approaches can predict the value of RHc reliably.


Carrot premix powder Structural stability Critical water activity Digital image analysis 

Mathematics Subject Classification




YVGT acknowledges to CONACyT for the SNI program. VBF acknowledges to SIP project 20180438. The authors recognize the experimental support of the CNMN-IPN in the realization of the present work.


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Authors and Affiliations

  1. 1.Instituto Politécnico NacionalCity of MexicoMexico
  2. 2.Facultad de Ciencias Químico BiológicasUniversidad Autónoma de SinaloaCuliacánMexico
  3. 3.Instituto Politécnico Nacional, Sección de Estudios de Posgrado e InvestigaciónUPIITA. Avenida Instituto Politécnico NacionalCity of MexicoMexico

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