Material science of in-directly expanded α (1,4) and (1,6) linked polymers
This research utilises twin-screw extruded directly expanded maize grits (IP1) into a secondary extrusion process, to create a homogenous intermediate product microstructure; that is later expanded into a final product using hot oil. The aim of this research is to begin to link ingredient processing...
| Main Author: | |
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| Format: | Thesis (University of Nottingham only) |
| Language: | English |
| Published: |
2017
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| Online Access: | https://eprints.nottingham.ac.uk/48802/ |
| _version_ | 1848797851112439808 |
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| author | Davies, Suzanne |
| author_facet | Davies, Suzanne |
| author_sort | Davies, Suzanne |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | This research utilises twin-screw extruded directly expanded maize grits (IP1) into a secondary extrusion process, to create a homogenous intermediate product microstructure; that is later expanded into a final product using hot oil. The aim of this research is to begin to link ingredient processing to intermediate and final product microstructures and understand how this effects final product attributes.
The impact of two versus one extrusion process on final product microstructure was demonstrated with statistically significant differences in expansion ratio, viscoelastic properties of intermediates, and water release mechanisms during heating. To overcome limitations in standard analytical methods, high heating rates were used to replicate conditions more similar to that of frying.
Using a secondary single-screw extrusion process, intermediates were manufactured with the incorporation of semi-crystalline materials at 10 % (rice flour (RF), micro-crystalline cellulose (MCC) and potato starch (PS)) into the amorphous starch matrix to design an intermediate and final product microstructure. PS increased expansion ratio but decreased cell sizes and both MCC and RF were found to decrease expansion ratio. Initial sensory screening suggested 10 % semi-crystalline material can impact the textural attributes of final products, with MCC and RF being more effective. This work has delivered proof of principle of a design-led microstructure approach to final product attributes. |
| first_indexed | 2025-11-14T20:10:26Z |
| format | Thesis (University of Nottingham only) |
| id | nottingham-48802 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T20:10:26Z |
| publishDate | 2017 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-488022025-02-28T13:57:09Z https://eprints.nottingham.ac.uk/48802/ Material science of in-directly expanded α (1,4) and (1,6) linked polymers Davies, Suzanne This research utilises twin-screw extruded directly expanded maize grits (IP1) into a secondary extrusion process, to create a homogenous intermediate product microstructure; that is later expanded into a final product using hot oil. The aim of this research is to begin to link ingredient processing to intermediate and final product microstructures and understand how this effects final product attributes. The impact of two versus one extrusion process on final product microstructure was demonstrated with statistically significant differences in expansion ratio, viscoelastic properties of intermediates, and water release mechanisms during heating. To overcome limitations in standard analytical methods, high heating rates were used to replicate conditions more similar to that of frying. Using a secondary single-screw extrusion process, intermediates were manufactured with the incorporation of semi-crystalline materials at 10 % (rice flour (RF), micro-crystalline cellulose (MCC) and potato starch (PS)) into the amorphous starch matrix to design an intermediate and final product microstructure. PS increased expansion ratio but decreased cell sizes and both MCC and RF were found to decrease expansion ratio. Initial sensory screening suggested 10 % semi-crystalline material can impact the textural attributes of final products, with MCC and RF being more effective. This work has delivered proof of principle of a design-led microstructure approach to final product attributes. 2017-07-13 Thesis (University of Nottingham only) NonPeerReviewed application/pdf en arr https://eprints.nottingham.ac.uk/48802/1/19%20DEC%202017%20Material%20Science%20of%20In-directly%20expanded%20glucose%20a%20%281%2C4%29%20and%20%281%2C6%29%20polymers.pdf Davies, Suzanne (2017) Material science of in-directly expanded α (1,4) and (1,6) linked polymers. MPhil thesis, University of Nottingham. |
| spellingShingle | Davies, Suzanne Material science of in-directly expanded α (1,4) and (1,6) linked polymers |
| title | Material science of in-directly expanded α (1,4) and (1,6) linked polymers |
| title_full | Material science of in-directly expanded α (1,4) and (1,6) linked polymers |
| title_fullStr | Material science of in-directly expanded α (1,4) and (1,6) linked polymers |
| title_full_unstemmed | Material science of in-directly expanded α (1,4) and (1,6) linked polymers |
| title_short | Material science of in-directly expanded α (1,4) and (1,6) linked polymers |
| title_sort | material science of in-directly expanded α (1,4) and (1,6) linked polymers |
| url | https://eprints.nottingham.ac.uk/48802/ |