Optimization of hot-air drying conditions on the physicochemical characteristics of torch ginger (Etlingera elatior)
Research output: Contribution to journal › Journal article › Research › peer-review
Standard
Optimization of hot-air drying conditions on the physicochemical characteristics of torch ginger (Etlingera elatior). / Juhari, Nurul Hanisah Binti; Lasekan, Ola; Muhammad, Kharidah; Karim, Shahrim.
In: Journal of Food, Agriculture & Environment (JFAE), Vol. 10, No. 2, 2, 02.10.2012, p. 64-72.Research output: Contribution to journal › Journal article › Research › peer-review
Harvard
APA
Vancouver
Author
Bibtex
}
RIS
TY - JOUR
T1 - Optimization of hot-air drying conditions on the physicochemical characteristics of torch ginger (Etlingera elatior)
AU - Juhari, Nurul Hanisah Binti
AU - Lasekan, Ola
AU - Muhammad, Kharidah
AU - Karim, Shahrim
PY - 2012/10/2
Y1 - 2012/10/2
N2 - Response surface methodology (RSM) was used to determine the effect of hot-air drying on physicochemical characteristics of torch ginger (Etlingera elatior). Three independent variables were time (3-5 hours), temperature (40-80°C) and loading capacity (0.5-2 kg/m2). In this research, 20 treatments were assigned based on central composite design (CCD) containing 8 factorial points, 6 centre points and 6 axial points. The quality of dried Torch ginger produced was evaluated by determining moisture content, water activity, Hunter L, a, b values and texture (brittleness). The results revealed that the linear terms exhibited significant (P<0.05) effect on moisture content. The quadratic terms showed significant (P<0.05) effect on water activity, texture (brittleness), colour L and colour b values; while for colour a values, the interaction terms of drying condition was the most significant (P<0.05) factor. A satisfactory coefficient of determination (R2) at 0.523, 0.807 and 0.953 was obtained for the response variables studied namely texture, moisture content and water activity, respectively. However, there are an unsatisfactory coefficient of determination (R2) for colour- L, colour-a and colour-b. No significant (p>0.05) lack of fit was indicated for the reduced models, except for the models fitted for texture. The optimization results indicated that the best response, within the range studied, was reached when the drying time was 4.1 h, the drying temperature 79°C and loading capacity 0.7kg/m2, respectively. No significant (p>0.05) difference was found between the experimental and predicted values, thus ensuring the adequacy of the response surface models employed for describing the effects of hot-air drying on physicochemical properties of Torch ginger.
AB - Response surface methodology (RSM) was used to determine the effect of hot-air drying on physicochemical characteristics of torch ginger (Etlingera elatior). Three independent variables were time (3-5 hours), temperature (40-80°C) and loading capacity (0.5-2 kg/m2). In this research, 20 treatments were assigned based on central composite design (CCD) containing 8 factorial points, 6 centre points and 6 axial points. The quality of dried Torch ginger produced was evaluated by determining moisture content, water activity, Hunter L, a, b values and texture (brittleness). The results revealed that the linear terms exhibited significant (P<0.05) effect on moisture content. The quadratic terms showed significant (P<0.05) effect on water activity, texture (brittleness), colour L and colour b values; while for colour a values, the interaction terms of drying condition was the most significant (P<0.05) factor. A satisfactory coefficient of determination (R2) at 0.523, 0.807 and 0.953 was obtained for the response variables studied namely texture, moisture content and water activity, respectively. However, there are an unsatisfactory coefficient of determination (R2) for colour- L, colour-a and colour-b. No significant (p>0.05) lack of fit was indicated for the reduced models, except for the models fitted for texture. The optimization results indicated that the best response, within the range studied, was reached when the drying time was 4.1 h, the drying temperature 79°C and loading capacity 0.7kg/m2, respectively. No significant (p>0.05) difference was found between the experimental and predicted values, thus ensuring the adequacy of the response surface models employed for describing the effects of hot-air drying on physicochemical properties of Torch ginger.
KW - Food processing
KW - Drying
KW - Hot-air drying
KW - Optimization
KW - Response Surface Methodology
KW - Food chemistry
KW - Physichochemical properties
KW - Tropical crops
KW - Torch ginger
KW - Etlingera elatior
KW - Herb and spices
KW - Ginger flower
M3 - Journal article
VL - 10
SP - 64
EP - 72
JO - Journal of Food, Agriculture and Environment
JF - Journal of Food, Agriculture and Environment
SN - 1459-0255
IS - 2
M1 - 2
ER -
ID: 149025072