| Autor: |
Diukareva, Galyna, Pak, Andrii, Gasanova, Anna |
| Předmět: |
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| Zdroj: |
Ukrainian Food Journal; 2014, Vol. 3 Issue 2, p249-256, 8p |
| Abstrakt: |
Introduction For the formation of biscuits quality natural carrier of iodine and sweetener from stevia leaves were used. Desorption of moisture is the dominant process, which will determine the guaranteed shelf life of biscuits. The conditions for the developed biscuits storage was determined by investigating of sorption isotherms and kinetics of reaching the equilibrium moisture content. Materials and Methods. The objects of study are newly developed biscuits: "Health" (rich in iodine and with the replacement of 50 % sugar by stevioside), "Light" (with the replacement of 75% of sugar by stevioside and enriched with wheat bran), "Fortified" (contains elamine, which is a natural source of iodine). Control - the biscuit prepared according to traditional recipes. Tenzometric method was used to study the sorption equilibrium moisture content. Differential function of pore radius distribution was determined using sorption isotherms and then have been subjected to approximation. Results. New biscuits samples are in the area of polymolecular and monomolecular sorption in the range of the relative air humidity (RAH) from 10 to 75 ... 80%. The control sample has less distinct plot of monomolecular sorption (10 to 20%) and short- moisture range wich is corresponding with polymolecular sorption (from 20 to 65 ... 70%). There is a moisture absorbtion of microcapillary and swelling of samples when RAH increases to 75 ... 80% for all the samples. The ratio of average pore radius to the most likely of the test samples are different that was shown by the investigation of differential function of pore distribution. So this ratio for biscuit "Health" is 5.73, for biscuit "Light" - 2.98, for biscuit "Fortified"- 4.91 and for the control - 3.88. Conclusions. There's the sense to store developed biscuits in a cardboard packaging with polymeric covering, if RAH is not more than 75%, and vapor-proof if RAH is above that. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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