Direct and indirect power ultrasound assisted pre-osmotic treatments in convective drying of guava slices
Application of ultrasound to osmotic dehydration of guava slices via indirect sonication using an ultrasonic bath system and direct sonication using an ultrasonic probe system was studied. Pre-treatments were designed in three osmotic solution concentrations of 0, 35, and 70 °Brix at indirect ultras...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2013
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| Online Access: | http://psasir.upm.edu.my/id/eprint/28762/1/Direct%20and%20indirect%20power%20ultrasound%20assisted%20pre.pdf |
| _version_ | 1796971394638020608 |
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| author | Kek, Siok Peng Chin, Nyuk Ling Yusof, Yus Aniza |
| author_facet | Kek, Siok Peng Chin, Nyuk Ling Yusof, Yus Aniza |
| author_sort | Kek, Siok Peng |
| collection | UPM |
| description | Application of ultrasound to osmotic dehydration of guava slices via indirect sonication using an ultrasonic bath system and direct sonication using an ultrasonic probe system was studied. Pre-treatments were designed in three osmotic solution concentrations of 0, 35, and 70 °Brix at indirect ultrasonic bath power from 0 to 2.5 kW for immersion times ranging for 20–60 min and direct ultrasonic probe amplitudes from 0 to 35% for immersion times of 6–20 min. The calculated ultrasound intensities from calorimetric ultrasound power dissipated indicated that direct sonication was more intensive than indirect sonication. The general linear model (GLM) showed that ultrasound input (power and amplitude), osmotic solution concentrations, and immersion time increased the water loss, solid gain, and total colour change of guava slices significantly with P < 0.0005. Indirect sonication in osmotic solutions contributed to high water loss and solid gain with acceptable total colour change than direct sonication. Applying ultrasound pre-osmotic treatment in 70 °Brix prior to hot-air drying reduced the drying time by 33%, increased the effective diffusivity by 35%, and decreased the total colour change by 38%. A remarkable decrease of hardness to 4.2 N obtained was also comparable to the fresh guava at 4.8 N. |
| first_indexed | 2024-03-06T08:12:29Z |
| format | Article |
| id | upm.eprints-28762 |
| institution | Universiti Putra Malaysia |
| language | English |
| last_indexed | 2024-03-06T08:12:29Z |
| publishDate | 2013 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | upm.eprints-287622015-09-18T00:52:20Z http://psasir.upm.edu.my/id/eprint/28762/ Direct and indirect power ultrasound assisted pre-osmotic treatments in convective drying of guava slices Kek, Siok Peng Chin, Nyuk Ling Yusof, Yus Aniza Application of ultrasound to osmotic dehydration of guava slices via indirect sonication using an ultrasonic bath system and direct sonication using an ultrasonic probe system was studied. Pre-treatments were designed in three osmotic solution concentrations of 0, 35, and 70 °Brix at indirect ultrasonic bath power from 0 to 2.5 kW for immersion times ranging for 20–60 min and direct ultrasonic probe amplitudes from 0 to 35% for immersion times of 6–20 min. The calculated ultrasound intensities from calorimetric ultrasound power dissipated indicated that direct sonication was more intensive than indirect sonication. The general linear model (GLM) showed that ultrasound input (power and amplitude), osmotic solution concentrations, and immersion time increased the water loss, solid gain, and total colour change of guava slices significantly with P < 0.0005. Indirect sonication in osmotic solutions contributed to high water loss and solid gain with acceptable total colour change than direct sonication. Applying ultrasound pre-osmotic treatment in 70 °Brix prior to hot-air drying reduced the drying time by 33%, increased the effective diffusivity by 35%, and decreased the total colour change by 38%. A remarkable decrease of hardness to 4.2 N obtained was also comparable to the fresh guava at 4.8 N. Elsevier 2013-10 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/28762/1/Direct%20and%20indirect%20power%20ultrasound%20assisted%20pre.pdf Kek, Siok Peng and Chin, Nyuk Ling and Yusof, Yus Aniza (2013) Direct and indirect power ultrasound assisted pre-osmotic treatments in convective drying of guava slices. Food and Bioproducts Processing, 91 (4). pp. 495-506. ISSN 0960-3085; ESSN: 1744-3571 10.1016/j.fbp.2013.05.003 |
| spellingShingle | Kek, Siok Peng Chin, Nyuk Ling Yusof, Yus Aniza Direct and indirect power ultrasound assisted pre-osmotic treatments in convective drying of guava slices |
| title | Direct and indirect power ultrasound assisted pre-osmotic treatments in convective drying of guava slices |
| title_full | Direct and indirect power ultrasound assisted pre-osmotic treatments in convective drying of guava slices |
| title_fullStr | Direct and indirect power ultrasound assisted pre-osmotic treatments in convective drying of guava slices |
| title_full_unstemmed | Direct and indirect power ultrasound assisted pre-osmotic treatments in convective drying of guava slices |
| title_short | Direct and indirect power ultrasound assisted pre-osmotic treatments in convective drying of guava slices |
| title_sort | direct and indirect power ultrasound assisted pre osmotic treatments in convective drying of guava slices |
| url | http://psasir.upm.edu.my/id/eprint/28762/1/Direct%20and%20indirect%20power%20ultrasound%20assisted%20pre.pdf |
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