Characterisation and application of fruit by-products as novel ingredients in gluten-free products

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dc.contributor.advisor Gallagher, Eimear en
dc.contributor.advisor Arendt, Elke K. en O'Shea, Norah L. 2014-09-30T15:39:18Z 2015-10-01T04:00:06Z 2014 2014
dc.identifier.citation O'Shea, N. L. 2014. Characterisation and application of fruit by-products as novel ingredients in gluten-free products. PhD Thesis, University College Cork. en
dc.identifier.endpage 287
dc.description.abstract The physicochemical and nutritional properties of two fruit by-products were initially studied. Apple pomace (AP) contained a high level of fibre and pectin. The isolated AP pectin had a high level of methylation which developed viscous pastes. Orange pomace also had high levels of fibre and pectin, and it was an abundant source of minerals such as potassium and magnesium. Due to the fibrous properties of orange pomace flour, proofing and water addition were studied in a bread formulation. When added at levels greater than 6%, the loaf volume decreased. An optimised formulation and proofing time was derived using the optimisation tool; these consisted of 5.5% orange pomace, 94.6% water inclusion and with 49 minutes proofing. These optimised parameters doubled the total dietary fibre content of the bread compared to the original control. Pasting results showed how orange pomace inclusions reduced the final viscosity of the batter, reducing the occurrence of starch gelatinisation. Rheological properties i.e. the storage modulus (G') and complex modulus (G*) increased in the orange pomace batter compared to the control batter. This demonstrates how the orange pomace as an ingredient improved the robustness of the formulation. Sensory panellists scored the orange pomace bread comparably to the control bread. Milled apple pomace was studied as a potential novel ingredient in an extruded snack. Parameters studied included apple pomace addition, die head temperature and screw speed. As screw speed increased the favourable extrudate characteristics such as radical expansion ratio, porosity and specific volume decreased. The inclusion of apple pomace had a negative effect on extrudate characteristics at levels greater than 8% addition. Including apple pomace reduced the hardness and increased the crispiness of the snack. The optimised and validated formulation and extrusion process contained the following parameters: 7.7% apple pomace, 150°C die head temperature and a screw speed of 69 rpm. en
dc.description.sponsorship Department of Agriculture, Food and the Marine, Ireland (FIRM) en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher University College Cork en
dc.rights © 2014, Norah L. O'Shea en
dc.rights.uri en
dc.subject Gluten-free bread en
dc.subject Extruded snacks en
dc.subject Composition en
dc.subject Pectin en
dc.subject Apple pomace en
dc.subject Orange pomace en
dc.title Characterisation and application of fruit by-products as novel ingredients in gluten-free products en
dc.type Doctoral thesis en
dc.type.qualificationlevel Doctoral en
dc.type.qualificationname PhD (Food Science and Technology) en
dc.internal.availability Full text available en
dc.description.version Accepted Version
dc.contributor.funder Department of Agriculture, Food and the Marine, Ireland en
dc.contributor.funder Teagasc
dc.description.status Not peer reviewed en Food and Nutritional Sciences en
dc.check.reason This thesis is due for publication or the author is actively seeking to publish this material en
dc.check.opt-out Not applicable en
dc.thesis.opt-out false
dc.check.embargoformat Both hard copy thesis and e-thesis en
dc.internal.conferring Summer Conferring 2014

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© 2014, Norah L. O'Shea Except where otherwise noted, this item's license is described as © 2014, Norah L. O'Shea
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