Amir Salari; Mostafa Mazaheri Tehrani; Seyed Mohammad Ali Razavi
Abstract
In this study, mathematical modeling of hot air baking-drying of thin-layer crisp bread was investigated. Thin-layer drying process were conducted under three different temperatures of 110, 150 and 190 °C at a constant air velocity of 0.5±0.1 m/s and absolute humidity of 0.6 ± 0.04g ...
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In this study, mathematical modeling of hot air baking-drying of thin-layer crisp bread was investigated. Thin-layer drying process were conducted under three different temperatures of 110, 150 and 190 °C at a constant air velocity of 0.5±0.1 m/s and absolute humidity of 0.6 ± 0.04g water/kg dry air. It was found that the baking-drying process occurred in falling rate period over the baking-drying times. Eight well-known thin-layer baking-drying models were fitted to the baking-drying experimental data of crisp bread, implementing non-linear regression analysis techniques. Based on the coefficient of determination (R²) and root mean square error (RMSE) values, it was concluded that the best models in terms of fitting performance for hot air baking-drying of bran free crisp bread were Wang & Singh and Logarithmic while for whole-wheat crisp bread were Page, Logarithmic and Wang & Singh. The moisture transfer from crisp bread was described using the Fick’s diffusion model. The effective diffusivity was within the range of 2.88×10-8 to 1.11×10-7 m2/s for bran free crisp bread and from 2.47×10-8 to 8.84×10-8 m2/s for whole-wheat crisp bread over the temperature range. The activation energy for bran free and whole-wheat crisp bread was found to be 25.22 and 23.43 kJ/mol, respectively..
Amir Salari; Mohammad Bagher Habibi Najafi; Reza Farhoosh; Seyed Hassan Marashi
Abstract
The effect of different solvent systems on the extraction of antioxidant and anti radical agents of grape seed was studied. For this purpose 6 different solvent systems with similar polarity and different selectivity were used to prepare grape seed extract. Extraction efficiency, reducing activity, radical ...
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The effect of different solvent systems on the extraction of antioxidant and anti radical agents of grape seed was studied. For this purpose 6 different solvent systems with similar polarity and different selectivity were used to prepare grape seed extract. Extraction efficiency, reducing activity, radical scavenging property and the effect of each extract on the increase of thermal resistance (oxidative stability index) of antioxidant free soybean oil were analyzed in the form of factorial test in a totally randomized design with triplicate repetition. Reducing activity test proved that grape seed extracts (GSE) had a higher reducing strength compared with BHT and α-Tocopherol except for ethylacetat treatment which had no significant difference between the extracts. Results of radical scavenging activity were similar to reducing activity results. The evaluation of oxidative stability index showed that acetone treatment has had the maximum Carry-through properties
Keywords: grape seed extract, antioxidant, antiradical, radical scavenging activity, solvent system, reducing power, oxidative stability index.
Amir Salari; Mohammad Bagher Habibi Najafi; Reza Farhoosh; Seyed Hassan Marashi
Abstract
This study has been done to survey of solvent system effect on extraction of grape seed extract and its antimicrobial properties. For this purpose, grape seed extracts were extracted with six different solvent systems. Minimum Bactericidal Concentration (MBC) of extract on six spoilage and Food-born ...
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This study has been done to survey of solvent system effect on extraction of grape seed extract and its antimicrobial properties. For this purpose, grape seed extracts were extracted with six different solvent systems. Minimum Bactericidal Concentration (MBC) of extract on six spoilage and Food-born pathogens was determined. The results indicated that MBC of different extracts have no significant difference and its value for Salmonella enteritidis, Escherichia coli, Enterobacter aerogenes was 1000 ppm. This value for S.aureus and listeria monocitogenes was 500 ppm. Results showed that gram positive bacteria were more sensitive than gram negative ones.
Mostafa Mazaheri Tehrani; Amir Salari; Akram Heidari
Abstract
nowadays, food industries by- product is one of the best choice for functional and novel food products. Bitter compound is the main problem to use lemon juice by-product.In this study, press peel and clarifier pulp residues were used to produce marmalade and drink.The vacuum method was proved to be the ...
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nowadays, food industries by- product is one of the best choice for functional and novel food products. Bitter compound is the main problem to use lemon juice by-product.In this study, press peel and clarifier pulp residues were used to produce marmalade and drink.The vacuum method was proved to be the best debittering process.This pulp contains considerable amount of pectin and acid which appropriate for marmalade and drink .
The results showed that considerable decrease of essential oils and bitterness, which confirm noticeable efficiency of this method. Debittering for 15 and 45 minutes under vacuum conditions reduce 50% and 88% of essential oils respectively. Processing more than 45 minutes had no effect on essential oils reduction.In addition, there was no significant differences in vitamin C between various treatments. Pulps debittered were used in marmalade and soft . These products scored by taste panel groups.
