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Mathematical and artificial neural network modelling for refractance window drying kinetics of coriander (Coriandrum sativum L.) followed by the determination of energy consumption, mass transfer parameters and quality

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Abstract

Coriander (Coriandrum sativum L.) is an aromatic and nutritious herb but often wasted due to limited processing. Drying is a common method for extending its shelf life. In the study, coriander was hot water blanched, pureed and dried with varying thicknesses of puree (2, 4 and 6 mm) and water temperatures (70, 80 and 90 °C) to assess drying characteristics, mass transfer and quality of coriander powder. It was noted that the time required for drying decreased as the water temperature was raised from 70 to 90 °C. The mathematical modelling showed that the Exponential two-term model had the highest R2 and lowest RSME and SEE values. Moreover, MR was accurately predicted using MLF-ANN with back-propagation algorithm, outperforming the mathematical model. Mass transfer calculated using Dincer and Dost analytical approach showed Deff and hm in the range of 1.980 × 10−9 to 1.839 × 10−8 m2/s and 1.881 × 10−6 to 5.653 × 10−6 m/s, respectively. Regardless of puree thickness, samples dried at 70 °C exhibited superior quality, followed by those dried at 80 °C and 90 °C. The 2-mm-thick puree, dried at 70 °C, displayed the highest antioxidant activity (82.893%), total phenolic content (20.833 mg GAE/100 g dw), total flavonoid content (11.159 mg QE/100 g dw) and total chlorophyll content (95.306 mg/100 g dw), in spite of a longer drying duration. This method appears favourable for yielding high-quality coriander powders.

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Abbreviations

ANN:

Artificial neural network

ANOVA:

Analysis of variance

B i :

Biot number

D eff :

Effective moisture diffusivity (m2/s)

DPFE:

Department of Processing and Food Engineering

DPPH:

2,2-Diphenyl-1-picrylhydrazyl

dx/dt :

Drying rate (g H2O/g min)

E :

Evaporative capacity (kg/m2 h)

F o :

Fourier number

G :

Lag factor

GAE:

Gallic acid equivalents

h m :

Mass transfer coefficient (m/s)

L :

Characteristic dimension (half thickness of slab, m)

L p :

Thickness of puree (m)

M :

Moisture content at any instance (%)

M e :

Equilibrium moisture content (%)

MLF:

Multi-layer feed-forward

M o :

Initial moisture content (%)

MR :

Moisture ratio

MSE:

Mean square error

n :

Number of observations

PAU:

Punjab Agricultural University

QE:

Quercetin equivalent

R value:

Correlation coefficient

R 2 :

Coefficient of determination

RMSE:

Root mean square error

RWD:

Refractance window drying

S :

Drying coefficient (s−1)

SEC:

Specific energy consumption (kWh/kg)

SEE:

Standard error of the estimate

t :

Drying time (min)

V e , i :

Experimental MR for the ith observation

V p , i :

Predicted MR for the ith observation

V p , m :

Mean value of predicted MR

ρ :

Density of the puree (kg/m3)

χ 2 :

Reduced chi-square

µ n :

nth root of the transcendental characteristic equation

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Acknowledgements

The authors acknowledge the resources and facilities provided by Punjab Agricultural University, Ludhiana, India, for carrying out this research work. Also, the authors express their gratitude to the University Grant Commission, India, for awarding the Savitribai Jyotirao Phule Fellowship for Single Girl Child (SJSGC).

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Ruchika Zalpouri: conceptualization, methodology, software, formal analysis, writing — original draft and writing — review and editing.

Manpreet Singh: conceptualization, resources, supervision and writing — review and editing.

Preetinder Kaur: conceptualization, resources and writing — review and editing.

Sukhmeet Singh: validation and writing — review and editing.

Satish Kumar: supervision and writing — review and editing.

Amrit Kaur: software and writing — review and editing.

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Correspondence to Ruchika Zalpouri.

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Zalpouri, R., Singh, M., Kaur, P. et al. Mathematical and artificial neural network modelling for refractance window drying kinetics of coriander (Coriandrum sativum L.) followed by the determination of energy consumption, mass transfer parameters and quality. Biomass Conv. Bioref. (2023). https://doi.org/10.1007/s13399-023-05013-y

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