The kinetics of the isothermal extraction of caffeine from the guarana seed powder with water under conventional (CH) and microwave heating (MWH) were investigated. By applying the isoconversional method, it was established that the kinetics of the caffeine extraction under CH and also under MWH is an elementary kinetic process. The model fitting method was used to determine the kinetics model of caffeine extraction. It was found that the kinetics of the caffeine extraction for both heating modes can be described by the Jander's equation. The rate of the extraction of caffeine under MWH is similar to 2 times higher than under CH. The values of kinetics parameters (Ea and lnA) of the extraction process under MWH are lower than for CH. The established influence of MWH on the kinetics of caffeine extraction is explained with a specific activation mechanism of water molecules and with an increase in the energy of the ground vibration level of resonant oscillator of N-3-CH3 band of caffeine... molecule (v=317 cm(-1)) which is caused by the absorption of microwave energy.
TY - JOUR
AU - Adnađević, Borivoj
AU - Koturević, Biljana
AU - Jovanović, Jelena
PY - 2017
UR - http://jakov.kpu.edu.rs/handle/123456789/788
AB - The kinetics of the isothermal extraction of caffeine from the guarana seed powder with water under conventional (CH) and microwave heating (MWH) were investigated. By applying the isoconversional method, it was established that the kinetics of the caffeine extraction under CH and also under MWH is an elementary kinetic process. The model fitting method was used to determine the kinetics model of caffeine extraction. It was found that the kinetics of the caffeine extraction for both heating modes can be described by the Jander's equation. The rate of the extraction of caffeine under MWH is similar to 2 times higher than under CH. The values of kinetics parameters (Ea and lnA) of the extraction process under MWH are lower than for CH. The established influence of MWH on the kinetics of caffeine extraction is explained with a specific activation mechanism of water molecules and with an increase in the energy of the ground vibration level of resonant oscillator of N-3-CH3 band of caffeine molecule (v=317 cm(-1)) which is caused by the absorption of microwave energy.
PB - Inst Chemical Engineers, Rugby
T2 - Chemical engineering research & design
T1 - Comparative kinetic analysis of isothermal extraction of caffeine from guarana seed under conventional and microwave heating
VL - 118
SP - 61
EP - 70
DO - 10.1016/j.cherd.2016.12.006
ER -
@article{
author = "Adnađević, Borivoj and Koturević, Biljana and Jovanović, Jelena",
year = "2017",
url = "http://jakov.kpu.edu.rs/handle/123456789/788",
abstract = "The kinetics of the isothermal extraction of caffeine from the guarana seed powder with water under conventional (CH) and microwave heating (MWH) were investigated. By applying the isoconversional method, it was established that the kinetics of the caffeine extraction under CH and also under MWH is an elementary kinetic process. The model fitting method was used to determine the kinetics model of caffeine extraction. It was found that the kinetics of the caffeine extraction for both heating modes can be described by the Jander's equation. The rate of the extraction of caffeine under MWH is similar to 2 times higher than under CH. The values of kinetics parameters (Ea and lnA) of the extraction process under MWH are lower than for CH. The established influence of MWH on the kinetics of caffeine extraction is explained with a specific activation mechanism of water molecules and with an increase in the energy of the ground vibration level of resonant oscillator of N-3-CH3 band of caffeine molecule (v=317 cm(-1)) which is caused by the absorption of microwave energy.",
publisher = "Inst Chemical Engineers, Rugby",
journal = "Chemical engineering research & design",
title = "Comparative kinetic analysis of isothermal extraction of caffeine from guarana seed under conventional and microwave heating",
volume = "118",
pages = "61-70",
doi = "10.1016/j.cherd.2016.12.006"
}
Adnađević, B., Koturević, B.,& Jovanović, J. (2017). Comparative kinetic analysis of isothermal extraction of caffeine from guarana seed under conventional and microwave heating.
Chemical engineering research & design
Inst Chemical Engineers, Rugby., 118, 61-70.
https://doi.org/10.1016/j.cherd.2016.12.006
Adnađević B, Koturević B, Jovanović J. Comparative kinetic analysis of isothermal extraction of caffeine from guarana seed under conventional and microwave heating. Chemical engineering research & design. 2017;118:61-70
Adnađević Borivoj, Koturević Biljana, Jovanović Jelena, "Comparative kinetic analysis of isothermal extraction of caffeine from guarana seed under conventional and microwave heating" Chemical engineering research & design, 118 (2017):61-70,
https://doi.org/10.1016/j.cherd.2016.12.006 .
