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...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Faculty of Food Science and Technology, Universiti Putra Malaysia
2015
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| Online Access: | http://psasir.upm.edu.my/id/eprint/36095/ http://psasir.upm.edu.my/id/eprint/36095/1/%2854%29.pdf |
| _version_ | 1848848237060947968 |
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| author | Chia, Siew Lian Chong, Gun Hean |
| author_facet | Chia, Siew Lian Chong, Gun Hean |
| author_sort | Chia, Siew Lian |
| building | UPM Institutional Repository |
| collection | Online Access |
| 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. |
| first_indexed | 2025-11-15T09:31:18Z |
| format | Article |
| id | upm-36095 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T09:31:18Z |
| publishDate | 2015 |
| publisher | Faculty of Food Science and Technology, Universiti Putra Malaysia |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-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 |
| 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 |
| title | 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_short | 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 |
| url | http://psasir.upm.edu.my/id/eprint/36095/ http://psasir.upm.edu.my/id/eprint/36095/ http://psasir.upm.edu.my/id/eprint/36095/1/%2854%29.pdf |