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Effects of open-air sun drying and pre-treatment on drying characteristics of purslane (Portulaca oleracea L.)

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Abstract

Effects of open-air sun drying and pre-treatment on drying characteristic of purslanes (Portulaca oleracea L.) were investigated. Drying times were determined as 31, 24 and 9 h for natural, salted and blanched, respectively. The higher “L” value and lower “−a/b” ratio values were obtained in natural dried purslane. The Aghbashlo et al. model gave a better fit to drying data.

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Abbreviations

MR :

Moisture ratio (dimensionless)

M e :

Equilibrium moisture content (g water/g dry matter)

M t :

Moisture content at any time during drying (g water/g dry matter)

M o :

Initial moisture content (g water/g dry matter)

χ 2 :

Chi square

RMSE:

Root mean square error

N :

Number of observations

z :

Number of constants

MR exp :

Experimental moisture ratio

MR pre :

Predicted moisture ratio

R 2 :

Determination of coefficient

k, k 0, n, A o , a, b, c, g, k 1, k 2, h :

Constants in models

t :

Drying time (min)

a :

Greenness

b :

Yellowness

L :

Lightness

C*:

Chroma

ΔE:

Color difference

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Authors and Affiliations

  1. Department of Chemical Engineering, Yildiz Technical University, Istanbul, Turkey

    Osman İsmail, Aysel Kantürk Figen & Sabriye Pişkin

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  1. Osman İsmail
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  2. Aysel Kantürk Figen
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  3. Sabriye Pişkin
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Correspondence to Aysel Kantürk Figen.

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İsmail, O., Kantürk Figen, A. & Pişkin, S. Effects of open-air sun drying and pre-treatment on drying characteristics of purslane (Portulaca oleracea L.). Heat Mass Transfer 51, 807–813 (2015). https://doi.org/10.1007/s00231-014-1452-8

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  • DOI: https://doi.org/10.1007/s00231-014-1452-8

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