Characteristics of Dynamics Sorption Isotherms of Date Flesh Powder Rich in Fiber

Abstract

Dynamic vapor sorption equipment (AQUADVS) was used to determine adsorption and desorption isotherms for powder rich in fiber (PRF) produced from Palm Date flesh of Sifri cultivar (Phoenix dactylifera L.) at temperatures 25, 35 and 45 °C in a wide range of water activity (0.09–0.87). Equilibrium was achieved within 29 and 25 h for the adsorption and desorption process respectively. The obtained data were fitted to ten models (Peleg, GAB, BET, Halsey, Oswin, Smith, Modified Henderson, Adam and Shove, Modified Oswin and Modified Halsey). The results indicated that the PRF followed type III behavior. The empirical Peleg model was found to be the best to represent the experimental data in the water activity range 0.09–0.87. The isosteric heat of sorption and the differential entropy decreased by increasing the moisture content and can be predicted by polynomial functions. Glass transition temperatures (Tg) of PRF were determined. The Tg decreased as the moisture content increased and can be correlated using the Gordon and Taylor model (R2=0.976). The PRF should be stored at moisture less than 9 d.b.% and temperature less than 35 °C.

Maltodextrin- modified starch microparticles containing benzoic acid: Physical properties and thermal stability

“…The moisture sorption isotherm of both the treatments MS and M showed a Type-II behavior (sigmoidal), while the treatment MS/M showed a Type III behavior (non-sigmoidal) (Roos & Drusch, 1995). According to Fikry and Al-Awaadh (2016) and Ribeiro et al (2019) the Type III isotherm is common for many foods having rich soluble components.…”

Sorption Isotherms and Thermodynamic Characteristics of Gelatin Powder Extracted from Whitefish Skin: Mathematical Modeling Approach

“…For describing the behavior of adsorption and desorption of the food powder, moisture sorption isotherms represent the relationship between a food’s equilibrium moisture content (X e ) and its corresponding water activity (a w ) across a range of a w values while maintaining a constant temperature [ 11 ]. Valuable insights into the water binding strength of a solid material can be elucidated [ 12 ].…”

“…Various methods are available for determining moisture sorption isotherms, in which the gravimetric method is commonly used [ 10 , 11 , 13 , 14 , 15 ]. This method involves measuring weight changes, which can be performed continuously or discontinuously in dynamic or static systems.…”

“…This setup facilitates faster equilibration due to the small sample chamber and continuous flow of dry nitrogen. Additionally, the DVS system eliminates the risk of microorganism growth at high RH, allowing for measurements of absorption and desorption isotherms using the same sample [ 11 , 17 ].…”

“…Therefore, extensive studies on this topic have previously been conducted by various researchers, including Rahman, et al [ 6 ], Aguirre-Álvarez, et al [ 10 ], Fikry and Al-Awaadh [ 11 ], Hassan, et al [ 15 ], Antoniolli, et al [ 18 ], Sormoli and Langrish [ 20 ], Rahman and Al-Belushi [ 31 ], Argyropoulos, et al [ 32 ], and Stępień, et al [ 33 ]. However, to the best of the authors’ knowledge, no published works on moisture sorption of whitefish skin gelatin powder (FSGP) under various temperatures and its thermodynamic characteristics are available.…”