Synthesis of surface: active maltodextrin laurates by enzymatic transesterification
Maltodextrins are polysaccharides that are widely used in the food industry due to their non-toxicity, low-price and functionality. Most polysaccharides are strongly hydrophilic and hence they are not suitable surface-active agents for emulsion systems. The modification of a polysaccharide’s hydroph...
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ftunivreading:oai:centaur.reading.ac.uk:88834 2023-09-05T13:12:50+02:00 Synthesis of surface: active maltodextrin laurates by enzymatic transesterification Yusof, Nurhayati Binti 2019-10-31 text https://centaur.reading.ac.uk/88834/ https://centaur.reading.ac.uk/88834/1/22849449_Yusof_thesis.pdf https://centaur.reading.ac.uk/88834/2/22849449_Yusof_form.PDF en eng https://centaur.reading.ac.uk/88834/1/22849449_Yusof_thesis.pdf https://centaur.reading.ac.uk/88834/2/22849449_Yusof_form.PDF Yusof, Nurhayati Binti (2019) Synthesis of surface: active maltodextrin laurates by enzymatic transesterification. PhD thesis, University of Reading. doi: https://doi.org/10.48683/1926.00088834 <https://doi.org/10.48683/1926.00088834> Thesis NonPeerReviewed 2019 ftunivreading https://doi.org/10.48683/1926.00088834 2023-08-14T18:12:09Z Maltodextrins are polysaccharides that are widely used in the food industry due to their non-toxicity, low-price and functionality. Most polysaccharides are strongly hydrophilic and hence they are not suitable surface-active agents for emulsion systems. The modification of a polysaccharide’s hydrophilic nature through the introduction of an ester group results in the synthesis of an amphiphilic polysaccharide. This thesis explores the use of enzymatic transesterification reaction, which involves incubating maltodextrins of different dextrose equivalent (DE), namely DE 4-7, DE 13-17 and DE 16.5-19.5 with a vinyl laurate in a mixture of DSMO and tert-Butyl alcohol (10:90) as solvent, and using an immobilised lipase B from Candida antarctica (Novozym® 435) to catalyse the reactions. The highest degree of substitution (DS) was 0.43 and was observed with maltodextrin DE16.5, indicating that the DS is influenced by steric hindrances affecting the reactivity of hydroxyl groups. However, the maltodextrin DE16.5 laurate was obtained with the lowest conversion yield (6.6 mg/g of initial substrates) indicating that from a production perspective this would be a less economically viable process. All maltodextrin laurates showed to be surface-active at a concentration of 10, 20 and 40 % (w/v). The maltodextrin laurates were tested for their emulsion formation ability and emulsion stability, oil-in-water (O/W) emulsion food systems. The maltodextrin DE4 laurate showed good stabilising and emulsifying properties and was more effective than the rest in reducing the emulsion creaming rate, most likely due to its higher viscosity. In addition to their emulsification properties, it was hypothesised that maltodextrin laurates can act like low molecular weight surfactants with detergency properties. The stability and compatibility of the three maltodextrin laurates in detergent formulations was tested targeting the removal of lipophilic substances (rapeseed oil) from cotton cloth. All maltodextrin laurates were shown to possess the ... Thesis Antarc* Antarctica CentAUR: Central Archive at the University of Reading |
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Maltodextrins are polysaccharides that are widely used in the food industry due to their non-toxicity, low-price and functionality. Most polysaccharides are strongly hydrophilic and hence they are not suitable surface-active agents for emulsion systems. The modification of a polysaccharide’s hydrophilic nature through the introduction of an ester group results in the synthesis of an amphiphilic polysaccharide. This thesis explores the use of enzymatic transesterification reaction, which involves incubating maltodextrins of different dextrose equivalent (DE), namely DE 4-7, DE 13-17 and DE 16.5-19.5 with a vinyl laurate in a mixture of DSMO and tert-Butyl alcohol (10:90) as solvent, and using an immobilised lipase B from Candida antarctica (Novozym® 435) to catalyse the reactions. The highest degree of substitution (DS) was 0.43 and was observed with maltodextrin DE16.5, indicating that the DS is influenced by steric hindrances affecting the reactivity of hydroxyl groups. However, the maltodextrin DE16.5 laurate was obtained with the lowest conversion yield (6.6 mg/g of initial substrates) indicating that from a production perspective this would be a less economically viable process. All maltodextrin laurates showed to be surface-active at a concentration of 10, 20 and 40 % (w/v). The maltodextrin laurates were tested for their emulsion formation ability and emulsion stability, oil-in-water (O/W) emulsion food systems. The maltodextrin DE4 laurate showed good stabilising and emulsifying properties and was more effective than the rest in reducing the emulsion creaming rate, most likely due to its higher viscosity. In addition to their emulsification properties, it was hypothesised that maltodextrin laurates can act like low molecular weight surfactants with detergency properties. The stability and compatibility of the three maltodextrin laurates in detergent formulations was tested targeting the removal of lipophilic substances (rapeseed oil) from cotton cloth. All maltodextrin laurates were shown to possess the ... |
format |
Thesis |
author |
Yusof, Nurhayati Binti |
spellingShingle |
Yusof, Nurhayati Binti Synthesis of surface: active maltodextrin laurates by enzymatic transesterification |
author_facet |
Yusof, Nurhayati Binti |
author_sort |
Yusof, Nurhayati Binti |
title |
Synthesis of surface: active maltodextrin laurates by enzymatic transesterification |
title_short |
Synthesis of surface: active maltodextrin laurates by enzymatic transesterification |
title_full |
Synthesis of surface: active maltodextrin laurates by enzymatic transesterification |
title_fullStr |
Synthesis of surface: active maltodextrin laurates by enzymatic transesterification |
title_full_unstemmed |
Synthesis of surface: active maltodextrin laurates by enzymatic transesterification |
title_sort |
synthesis of surface: active maltodextrin laurates by enzymatic transesterification |
publishDate |
2019 |
url |
https://centaur.reading.ac.uk/88834/ https://centaur.reading.ac.uk/88834/1/22849449_Yusof_thesis.pdf https://centaur.reading.ac.uk/88834/2/22849449_Yusof_form.PDF |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
https://centaur.reading.ac.uk/88834/1/22849449_Yusof_thesis.pdf https://centaur.reading.ac.uk/88834/2/22849449_Yusof_form.PDF Yusof, Nurhayati Binti (2019) Synthesis of surface: active maltodextrin laurates by enzymatic transesterification. PhD thesis, University of Reading. doi: https://doi.org/10.48683/1926.00088834 <https://doi.org/10.48683/1926.00088834> |
op_doi |
https://doi.org/10.48683/1926.00088834 |
_version_ |
1776201952878657536 |