Influence of microwave vacuum drying on the effective moisture diffusivity of seedless white grapes

LEI, Yongdong; CHEN, Jiluan; ZHANG, Zhenghong; DENG, Xiaorong

doi:10.1590/fst.37020

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Food Science and Technology

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Original Article • Food Sci. Technol (Campinas) 42 • 2022 • https://doi.org/10.1590/fst.37020 copy

Influence of microwave vacuum drying on the effective moisture diffusivity of seedless white grapes

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

In this study, the effects of microwave power, vacuum degree and load weight on the moisture content of seedless white grapes (Vitis vinifera L.) during microwave vacuum drying were investigated. The result found that during microwave vacuum drying, the effective moisture diffusivity (D_eff) of seedless white grapes ranged between 1.0232 × 10⁻⁹ and 4.6354 × 10⁻⁹ m²/s. The D_eff values increased with the increase in the microwave power and the decrease in the load weight, the vacuum degree played a relatively minor role. The kinetics of moisture ratio and drying time were established, with the drying process following the Page model, as reflected by the fitting between model-predicted and measured data. The Page model was demonstrated to precisely describe and predict the moisture content variation in seedless white grapes during microwave vacuum drying.

Keywords:
seedless white grapes; microwave vacuum drying; effective moisture diffusivity; kinetic model

Vacuum degree (MPa)	Load weight (g)	Microwave power (W)	Linear regression equation	R ²	D_eff ×10^-9 (m²·s^-1)
-0.06	501.54 ± 2.34	150	ln MR = -0.00099t + 0.40736	0.99390	1.6538 ± 0.2498^e
-0.04	502.45 ± 3.21	150	ln MR = -0.00093t + 0.43893	0.99336	1.2753 ± 0.2231^f
-0.02	501.78 ± 2.56	150	ln MR = -0.00087t + 0.54352	0.98878	1.2065 ± 0.1746^f
-0.06	202.15 ± 3.52	150	ln MR = -0.00014t + 0.80972	0.97049	2.0675 ± 0.2486^c
-0.06	1004.23 ± 3.83	150	ln MR = -0.00128t + 0.80571	0.97537	1.8463 ± 0.3218^d
-0.06	502.86 ± 3.57	300	ln MR = -0.00175t + 1.00933	0.95683	3.5892 ± 0.2142^b
-0.06	202.91 ± 2.17	300	ln MR = -0.00275t + 1.20132	0.86086	4.6354 ± 0.3473^a
-0.02	201.62 ± 2.85	50	ln MR = -0.00077t + 0.54361	0.98919	1.0232 ± 0.1872^g
-0.04	203.75 ± 3.59	150	ln MR = -0.00092t + 0.37549	0.99456	1.2237 ± 0.1034^f

Vacuum degree (MPa)	Load weight (g)	Microwave power (W)	Parameter	Regression coefficient	SE	t	R ²	P
0.06	502.34 ± 2.76	150	lnk	-5.34062	0.31489	-16.96054	0.97131	﹤0.0001
0.06	502.34 ± 2.76	150	n	1.54838	0.07673	20.17956	0.97131	﹤0.0001
0.04	501.43 ± 3.25	150	lnk	-5.57697	0.29832	-18.69448	0.97528	﹤0.0001
0.04	501.43 ± 3.25	150	n	1.58338	0.07269	21.78140	0.97528	﹤0.0001
0.02	503.62 ± 2.46	150	lnk	-5.9475	0.23368	-25.45188	0.98570	﹤0.0001
0.02	503.62 ± 2.46	150	n	1.63841	0.05694	28.77345	0.98570	﹤0.0001
0.06	203.87 ± 3.49	150	lnk	-6.22198	0.19125	-32.53348	0.99406	﹤0.0001
0.06	203.87 ± 3.49	150	n	1.84837	0.05051	36.59278	0.99406	﹤0.0001
0.06	1002.32 ± 5.28	150	lnk	-6.26572	0.21643	-28.95059	0.99164	﹤0.0001
0.06	1002.32 ± 5.28	150	n	1.82504	0.05584	32.68386	0.99164	﹤0.0001
0.06	503.36 ± 2.53	300	lnk	-6.38353	0.30715	-20.78305	0.98760	﹤0.0001
0.06	503.36 ± 2.53	300	n	1.96823	0.08330	23.62848	0.98760	﹤0.0001
0.06	203.08 ± 3.19	300	lnk	-7.20484	0.58403	-12.33641	0.97881	﹤0.0001
0.06	203.08 ± 3.19	300	n	2.40532	0.17648	13.62911	0.97881	﹤0.0001
0.02	201.67 ± 4.21	50	lnk	-6.16107	0.22117	-27.85719	0.98667	﹤0.0001
0.02	201.67 ± 4.21	50	n	1.64614	0.05305	31.03155	0.98667	﹤0.0001
0.04	202.09 ± 2.86	150	lnk	-5.20022	0.26315	-19.76130	0.97726	﹤0.0001
0.04	202.09 ± 2.86	150	n	1.49316	0.06312	23.65677	0.97726	﹤0.0001

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[1] *Corresponding author: dxr20099@hotmail.com