The effects of microwave processing on water soluble vitamins (ascorbic acid, niacin, thiamin, and riboflavin) were determined. The kinetic parameters of vitamin degradation reactions for microwave heating were determined for model vitamin systems. The degradation reactions were found to be first-order reactions. The kinetic parameters at different temperatures were also determined.


Influence of alcohols on citric acid production by Aspergillus niger A-9 entrapped in polyacrylamide gels
Yaykasli, KO; Demirel, G; Yasar, A (Elsevier BV, 2005-10-01)
In this study, the production of citric acid has been achieved by using Aspergillus niger conidiaspores, entrapped in polyacrylamide gels, and the factors that affect this production have been investigated. On citric acid production the effect of starting sucrose concentration (100-180 g/l), the initial nitrogen concentration (0-0.3 g/l), the effect of the methanol concentration in 100ml feeding medium (0-6 ml), and finally the effect of ethanol concentration (0-6 ml) in 100 ml feeding medium were studied a...
Formation of capsaicin loaded nanoemulsions with high pressure homogenization and ultrasonication
Akbaş, Elif; Soyler, Betul; Öztop, Halil Mecit (Elsevier BV, 2018-10-01)
Nanoemulsions could increase the bioavailability of lipophilic compounds. In this study, nanoemulsions were obtained by high pressure homogenization and ultrasonication using capsaicin (oleoresin capsicum) (2 g/100g) in the oil phase and Tween 80 (2 g/100g), glycerol (0-50 g/100g) in the aqueous phase at pH 7.4 and 3.8. Mean droplet sizes below 65 nm were obtained with ultrasonication. Translucent nanoemulsions with minimum 79% efficiencies were obtained with high pressure homogenization. Pressurized nanoem...
Effects of Bentonite Combinations and Gelatin on the Rheological Behaviour of Bentonite – Apple Juice Dispersions
Dik, Tunay; Özilgen, Mustafa (Elsevier BV, 1996-11)
Rheological behaviour of bentonite – apple juice suspensions were experimentally determined at 25°C, within the shear rate range of 4.3 to 43.1 s−1with 0.90, 1.33 and 2.66 g/L bentonite mixtures and 0 to 0.25 g/L (on dry basis) gelatin concentrations. The mixtures consisted of 100%, 80%, 60%, 40% 20% and 0% Ca-bentonite and balance Na-bentonite combinations. The experimental data were described with the power law as τ =Kγ.1.56. The consistency index was related to the calcium, sodium and gelatin concentrati...
The impact of UV-C irradiation on spoilage microorganisms and colour of orange juice
Taze, Bengi Hakguder; Unluturk, Sevcan; Buzrul, Sencer; Alpas, Hami (Springer Science and Business Media LLC, 2015-02-01)
The effect of UV-C irradiation on inactivation of spoilage microorganisms and colour of freshly squeezed orange juice were investigated. Orange juice samples were intentionally fermented in order to increase the natural microflora which were mostly composed of yeasts and then exposed to UV-C irradiation at an intensity level of 1.32 mW/cm(2) and sample depth of 0.153 cm for several exposure times by using a collimated beam apparatus. Applied UV dose was in the range of 0 and 108.42 mJ/cm(2). Resistance of y...
Effects of soy and rice flour addition on batter rheology and quality of deep-fat fried chicken nuggets
Dogan, SF; Şahin, Serpil; Şümnü, Servet Gülüm (Elsevier BV, 2005-11-01)
The effects of soy flour (5%) and rice flour (5%) addition to the batter formulation on quality of deep-fat fried chicken nuggets were evaluated. Coating pick-up of batters, and moisture content, oil content, texture, color and porosity of nuggets were determined for 3, 6, 9 and 12 min of frying times at 180 degrees C. A batter formulation with no flour addition was used as control. Additionally, the rheological properties of batters were studied and coating pick-up was found to be directly proportional to ...
Citation Formats
Z. A. Ökmen and A. Bayındırlı, “EFFECT OF MICROWAVE PROCESSING ON WATER SOLUBLE VITAMINS: KINETIC PARAMETERS,” INTERNATIONAL JOURNAL OF FOOD PROPERTIES, pp. 255–264, 1999, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/36609.