Color Change Kinetics of Tea Leaves During Microwave Drying
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Elçin Demirhan
und
Belma Özbek
Abstract
In the present study, the effect of microwave power and sample amount on color change kinetics of tea leaves was investigated during microwave drying. Hunter L, a and b system was used for the color change of the materials; and the total color change (ΔE), chroma, hue angle and browning index (BI) were calculated by using these values. The color of the tea leaves was shifted towards the darker region after the microwave drying process. The mathematical modeling study of color change kinetic showed that a, b, chroma and BI fitted to a first-order kinetic model, while L, total color change (ΔE) and hue angle followed a zero-order kinetic model. For calculation of the activation energy for color change kinetic parameters, the exponential expression based on Arrhenius equation was used.
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©2015 by De Gruyter
Artikel in diesem Heft
- Frontmatter
- Research Articles
- Modeling and Improving the Performance of Cabinet Solar Dryer Using Computational Fluid Dynamics
- Evaluation of Chemical, Biochemical and Microbiological Quality in Tomato Using Multivariate Analysis
- Effects of the Addition of Grape Seed Powder on the Thermorheological Properties of Frying Batters
- Degradation of Vitamin E in Nanoemulsions during Storage as Affected by Temperature, Light and Darkness
- Effect of Different Drying Processes on the Physicochemical and Antioxidant Properties of Thinned Young Apple
- Mechanical and Sensory Evaluation of Noodles Incorporated with Betel Leaf Extract
- Mathematical Modeling of Thin-Layer Solar Drying of Eland (Taurotragus oryx) Jerky
- Thin-Layer Drying Model of Rambutan (Nephelium lappaceum L.) Kernel and Its Application in Fat Extraction Process
- Color Change Kinetics of Tea Leaves During Microwave Drying
- Influence of Blanching Pretreatment on the Drying Characteristics of Cherry Tomato and Mathematical Modeling
- Studies on Grinding and Extraction of Oil from Fenugreek (Trigonella foenum-graecum) Seed
- Effect of Drum Drying on Physico-chemical Characteristics of Dragon Fruit Peel (Hylocereus polyrhizus)
- Standardization of Curing and Microwave Drying of Turmeric (Curcuma longa) Rhizomes
- Shorter Communication
- Assessment and Separation of Angiotensin I-Converting Enzyme Inhibitory Peptides in Chinese Soypaste
Artikel in diesem Heft
- Frontmatter
- Research Articles
- Modeling and Improving the Performance of Cabinet Solar Dryer Using Computational Fluid Dynamics
- Evaluation of Chemical, Biochemical and Microbiological Quality in Tomato Using Multivariate Analysis
- Effects of the Addition of Grape Seed Powder on the Thermorheological Properties of Frying Batters
- Degradation of Vitamin E in Nanoemulsions during Storage as Affected by Temperature, Light and Darkness
- Effect of Different Drying Processes on the Physicochemical and Antioxidant Properties of Thinned Young Apple
- Mechanical and Sensory Evaluation of Noodles Incorporated with Betel Leaf Extract
- Mathematical Modeling of Thin-Layer Solar Drying of Eland (Taurotragus oryx) Jerky
- Thin-Layer Drying Model of Rambutan (Nephelium lappaceum L.) Kernel and Its Application in Fat Extraction Process
- Color Change Kinetics of Tea Leaves During Microwave Drying
- Influence of Blanching Pretreatment on the Drying Characteristics of Cherry Tomato and Mathematical Modeling
- Studies on Grinding and Extraction of Oil from Fenugreek (Trigonella foenum-graecum) Seed
- Effect of Drum Drying on Physico-chemical Characteristics of Dragon Fruit Peel (Hylocereus polyrhizus)
- Standardization of Curing and Microwave Drying of Turmeric (Curcuma longa) Rhizomes
- Shorter Communication
- Assessment and Separation of Angiotensin I-Converting Enzyme Inhibitory Peptides in Chinese Soypaste
