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95569

STUDY THE IMPACT OF CONVECTIVE DRYING ON THE QUALITY OF TWO TYPES OF ONION

Article

Last updated: 26 Dec 2024

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Tags

Processing Engineering of Agricultural Products

Abstract

In this study a convective dryer was used to dry two types of onion (red and white) under three different thickness (0.5,1 and 2 cm) and two different levels of air temperatures (65 and 80 oC) to esteem drying characteristics, quality evaluation and the effective moisture diffusivity. At the end of the experiments, the samples were reached 8±1%, w.b. moisture content. The effect of air drying temperature was respectable on the drying time. The Page and Modified Page (I) models were the best compatible models for all treatments. For dried samples quality assessment, the total color change (δE) was better in the dried slices at lower temperature in both types for all slices thickness. The rehydration ratio extended from 2.03 to 2.68 at different parameters. Generally, the rehydration ratio was preferable at low temperature with regard to the two types of dried onions. From the results of quality assessment, convective drying has no defect to the dried samples, so that it is one of the best ways to dry onions. Effective moisture diffusivity of white onion extended from 1.50×10-7 to 4.90×10-7m2.s-1, however red onion, extended from 6.25×10-7 to 6.50×10-6m2.s-1. The moisture diffusivity increased as drying air temperature increased for both types of onion.

DOI

10.21608/mjae.2018.95569

Authors

First Name

Mona

Last Name

Hassan

MiddleName

M.

Affiliation

Associate Prof. of Agric. Eng., Fac. of Agric., Zagazig Univ., Egypt.

Email

-

City

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Orcid

-

First Name

Taghreed

Last Name

Ahmed

MiddleName

H.

Affiliation

Lecturer of Agric. Eng., Fac. of Agric., Zagazig Univ., Egypt

Email

-

City

-

Orcid

-

Volume

35

Article Issue

3

Related Issue

14404

Issue Date

2018-07-01

Receive Date

2020-06-13

Publish Date

2018-07-01

Page Start

933

Page End

952

Print ISSN

1687-384X

Online ISSN

2636-3062

Article File

MJAE_Volume 35_Issue 3_Pages 933-952.pdf

PDF . 791.4kB

Link

https://mjae.journals.ekb.eg/article_95569.html

Detail API

https://mjae.journals.ekb.eg/service?article_code=95569

Order

9

Type

Original Article

Type Code

1,326

Publication Type

Journal

Publication Title

Misr Journal of Agricultural Engineering

Publication Link

https://mjae.journals.ekb.eg/

MainTitle

STUDY THE IMPACT OF CONVECTIVE DRYING ON THE QUALITY OF TWO TYPES OF ONION

Details

Type

Article

Created At

23 Jan 2023