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Effect of rotation speed and steam pressure on physico-chemical properties of drum dried pitaya (Hylocereus polyrhizus) peel

Red pitaya (Hylocereus polyrhizus) peel is a rich source of fibre, antioxidant and betacyanin; however, it is discarded during processing, so it is able to cause environmental problems. In order to convert the fruit waste to potential by-product ingredients, drum drying is used as pre-treatment to c...

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Main Authors: Chia, Siew Lian, Chong, Gun Hean
Format: Article
Language:English
Published: Faculty of Food Science and Technology, Universiti Putra Malaysia 2015
Online Access:http://psasir.upm.edu.my/id/eprint/36095/1/%2854%29.pdf
http://psasir.upm.edu.my/id/eprint/36095/
http://www.ifrj.upm.edu.my/22%20%2801%29%202015/%2854%29.pdf
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spelling my.upm.eprints.360952016-01-27T00:11:08Z http://psasir.upm.edu.my/id/eprint/36095/ Effect of rotation speed and steam pressure on physico-chemical properties of drum dried pitaya (Hylocereus polyrhizus) peel Chia, Siew Lian Chong, Gun Hean Red pitaya (Hylocereus polyrhizus) peel is a rich source of fibre, antioxidant and betacyanin; however, it is discarded during processing, so it is able to cause environmental problems. In order to convert the fruit waste to potential by-product ingredients, drum drying is used as pre-treatment to create an ingredient which is shelf-stable. In this study, the effects of rotation speed and steam pressure of drums on the physico-chemical properties of pitaya peel that had undergone drum drying are investigated. Pitaya peel was dried in a laboratory scale double drum dryer at rotation speed of 1, 2, and 3 rpm at steam pressure of 1, 2, and 3 bar. The drum dried pitaya peel was then further analyzed based on percentage yield, moisture content, water activity, betacyanin retention and color change. Interaction of steam pressure and rotation speed gives significant effect (p < 0.05) on percentage yield, moisture content, water activity, betacyanin retention and Hunter L value, whereas it has no significant on Hunter a and b values. The best combination parameters (1 rpm and 2 bar) yield the highest betacyanin retention (80.21 mg/g of dry solid), acceptable moisture content (10.66% wet basis), water activity (aw = 0.42) and with 7.61% of yield. Faculty of Food Science and Technology, Universiti Putra Malaysia 2015 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/36095/1/%2854%29.pdf Chia, Siew Lian and Chong, Gun Hean (2015) Effect of rotation speed and steam pressure on physico-chemical properties of drum dried pitaya (Hylocereus polyrhizus) peel. International Food Research Journal, 22 (1). pp. 372-376. ISSN 1985-4668; ESSN: 2231-7546 http://www.ifrj.upm.edu.my/22%20%2801%29%202015/%2854%29.pdf
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
description Red pitaya (Hylocereus polyrhizus) peel is a rich source of fibre, antioxidant and betacyanin; however, it is discarded during processing, so it is able to cause environmental problems. In order to convert the fruit waste to potential by-product ingredients, drum drying is used as pre-treatment to create an ingredient which is shelf-stable. In this study, the effects of rotation speed and steam pressure of drums on the physico-chemical properties of pitaya peel that had undergone drum drying are investigated. Pitaya peel was dried in a laboratory scale double drum dryer at rotation speed of 1, 2, and 3 rpm at steam pressure of 1, 2, and 3 bar. The drum dried pitaya peel was then further analyzed based on percentage yield, moisture content, water activity, betacyanin retention and color change. Interaction of steam pressure and rotation speed gives significant effect (p < 0.05) on percentage yield, moisture content, water activity, betacyanin retention and Hunter L value, whereas it has no significant on Hunter a and b values. The best combination parameters (1 rpm and 2 bar) yield the highest betacyanin retention (80.21 mg/g of dry solid), acceptable moisture content (10.66% wet basis), water activity (aw = 0.42) and with 7.61% of yield.
format Article
author Chia, Siew Lian
Chong, Gun Hean
spellingShingle Chia, Siew Lian
Chong, Gun Hean
Effect of rotation speed and steam pressure on physico-chemical properties of drum dried pitaya (Hylocereus polyrhizus) peel
author_facet Chia, Siew Lian
Chong, Gun Hean
author_sort Chia, Siew Lian
title Effect of rotation speed and steam pressure on physico-chemical properties of drum dried pitaya (Hylocereus polyrhizus) peel
title_short Effect of rotation speed and steam pressure on physico-chemical properties of drum dried pitaya (Hylocereus polyrhizus) peel
title_full Effect of rotation speed and steam pressure on physico-chemical properties of drum dried pitaya (Hylocereus polyrhizus) peel
title_fullStr Effect of rotation speed and steam pressure on physico-chemical properties of drum dried pitaya (Hylocereus polyrhizus) peel
title_full_unstemmed Effect of rotation speed and steam pressure on physico-chemical properties of drum dried pitaya (Hylocereus polyrhizus) peel
title_sort effect of rotation speed and steam pressure on physico-chemical properties of drum dried pitaya (hylocereus polyrhizus) peel
publisher Faculty of Food Science and Technology, Universiti Putra Malaysia
publishDate 2015
url http://psasir.upm.edu.my/id/eprint/36095/1/%2854%29.pdf
http://psasir.upm.edu.my/id/eprint/36095/
http://www.ifrj.upm.edu.my/22%20%2801%29%202015/%2854%29.pdf
_version_ 1643831647816122368
score 13.211869

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