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Optimization of extraction yield of quince seed gum and rheological characteristics under the optimum extraction conditions
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B Abbastabar   , MH Azizi * , S Abbasi |
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Abstract: (8760 Views) |
| Background and Objective: Food gums are a class of food additives playing various roles, such as thickening, gelling and stabilizing of the food aqueous solutions. In this study, the best conditions for quince seed gum extraction and its rheological characteristics were determined.
Materials and Methods: The effects of temperature range (25-80 ºC), pH (3-11) and water-to-seed ratio (50-120 w/w) on the yield of quince seed gum extraction were optimized by statistical analysis using response surface methodology (RSM). Rheological properties of the quince seed gum, such as strain sweep and frequency sweep, were determined with a rheometer (Anton Paar, MCR300, CC27), while for determination of intrinsic viscosity and Huggins constant capillary viscometer was used.
Results: Based on the response surface methodology, temperature and water-to-seed ratio affected the quince seed gum extraction yield significantly (p< 0.05). The maximum extraction yield occurred at a temperature of 60.77 oC, a water-to-seed ratio of 96.2 (w/w), and a pH of 6.6. The Cross model fitted the data with a regression more than 0.98. The slopes of the lines for the dilute and semi-dilute regions and critical concentration occurred at a concentration of 0.6%, 2.0% and 0.077%, respectively. The linear viscoelastic range of the gum solution (0.3%) deviated from linear route at strain 11.4%. Loss and storage moduli of the gum solution (0.3%) were frequency dependent. The intrinsic viscosity and Huggins constant were found to be 1530 and 0.31, respectively.
Conclusion: Quince seed gum has a high extraction yield, strong gelling structure, and hydrodynamic volume. It can, therefore, be used as a thickener in food products
Keywords: Extraction, Response surface methodology, Rheology, Linear viscoelastic region |
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| Keywords: Extraction, Response surface methodology, Rheology, Linear viscoelastic region |
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Full-Text [PDF 317 kb]
(4880 Downloads)
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Article type: Research |
Subject:
Food Science
Received: 2013/10/13 | Accepted: 2014/03/1 | Published: 2014/07/27
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