Influence of Oxidation Degree on the Physicochemical Properties of Oxidized Inulin
This paper reports the oxidation of inulin using varying ratios of sodium periodate and the characterization of the inulin polyaldehyde. The physicochemical properties of the inulin polyaldehyde (oxidized inulin) were characterized using different techniques including 1D NMR spectroscopy, <sup>...
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MDPI AG
2020-05-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/12/5/1025 |
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| author | Franklin Afinjuomo Paris Fouladian Thomas G. Barclay Yunmei Song Nikolai Petrovsky Sanjay Garg |
| author_facet | Franklin Afinjuomo Paris Fouladian Thomas G. Barclay Yunmei Song Nikolai Petrovsky Sanjay Garg |
| author_sort | Franklin Afinjuomo |
| collection | DOAJ |
| description | This paper reports the oxidation of inulin using varying ratios of sodium periodate and the characterization of the inulin polyaldehyde. The physicochemical properties of the inulin polyaldehyde (oxidized inulin) were characterized using different techniques including 1D NMR spectroscopy, <sup>13</sup>C Nuclear magnetic resonance (NMR), Fourier transform infrared spectroscopy (FTIR), thermal gravimetric analysis (TGA), differential scanning calorimetric (DSC), ultraviolet-visible spectroscopy (UV), and scanning electron microscopy (SEM). The aldehyde peak was not very visible in the FTIR, because the aldehyde functional group exists in a masked form (hemiacetal). The thermal stability of the oxidized inulin decreased with the increasing oxidation degree. The smooth spherical shape of raw inulin was destructed due to the oxidation, as confirmed by the SEM result. The <sup>1</sup>HNMR results show some new peaks from 4.8 to 5.0 as well as around 5.63 ppm. However, no aldehyde peak was found around 9.7 ppm. This can be attributed to the hemiacetal. The reaction of oxidized inulin with tert-butyl carbazate produced a carbazone conjugate. There was clear evidence of decreased peak intensity for the proton belonging to the hemiacetal group. This clearly shows that not all of the hemiacetal group can be reverted by carbazate. In conclusion, this work provides vital information as regards changes in the physicochemical properties of the oxidized inulin, which has direct implications when considering the further utilization of this biomaterial. |
| first_indexed | 2024-03-10T20:06:11Z |
| format | Article |
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| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-10T20:06:11Z |
| publishDate | 2020-05-01 |
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| series | Polymers |
| spelling | doaj.art-150158bf60dd41a5a51fb229ef01e7152023-11-19T23:15:22ZengMDPI AGPolymers2073-43602020-05-01125102510.3390/polym12051025Influence of Oxidation Degree on the Physicochemical Properties of Oxidized InulinFranklin Afinjuomo0Paris Fouladian1Thomas G. Barclay2Yunmei Song3Nikolai Petrovsky4Sanjay Garg5Pharmaceutical Innovation and Development Group, University of South Australia, Adelaide 5000, AustraliaPharmaceutical Innovation and Development Group, University of South Australia, Adelaide 5000, AustraliaPharmaceutical Innovation and Development Group, University of South Australia, Adelaide 5000, AustraliaPharmaceutical Innovation and Development Group, University of South Australia, Adelaide 5000, AustraliaVaxine Pty. Ltd., Adelaide 5042, AustraliaPharmaceutical Innovation and Development Group, University of South Australia, Adelaide 5000, AustraliaThis paper reports the oxidation of inulin using varying ratios of sodium periodate and the characterization of the inulin polyaldehyde. The physicochemical properties of the inulin polyaldehyde (oxidized inulin) were characterized using different techniques including 1D NMR spectroscopy, <sup>13</sup>C Nuclear magnetic resonance (NMR), Fourier transform infrared spectroscopy (FTIR), thermal gravimetric analysis (TGA), differential scanning calorimetric (DSC), ultraviolet-visible spectroscopy (UV), and scanning electron microscopy (SEM). The aldehyde peak was not very visible in the FTIR, because the aldehyde functional group exists in a masked form (hemiacetal). The thermal stability of the oxidized inulin decreased with the increasing oxidation degree. The smooth spherical shape of raw inulin was destructed due to the oxidation, as confirmed by the SEM result. The <sup>1</sup>HNMR results show some new peaks from 4.8 to 5.0 as well as around 5.63 ppm. However, no aldehyde peak was found around 9.7 ppm. This can be attributed to the hemiacetal. The reaction of oxidized inulin with tert-butyl carbazate produced a carbazone conjugate. There was clear evidence of decreased peak intensity for the proton belonging to the hemiacetal group. This clearly shows that not all of the hemiacetal group can be reverted by carbazate. In conclusion, this work provides vital information as regards changes in the physicochemical properties of the oxidized inulin, which has direct implications when considering the further utilization of this biomaterial.https://www.mdpi.com/2073-4360/12/5/1025oxidized inulinperiodate oxidationaldehyde contentdegree of oxidation and physicochemical properties |
| spellingShingle | Franklin Afinjuomo Paris Fouladian Thomas G. Barclay Yunmei Song Nikolai Petrovsky Sanjay Garg Influence of Oxidation Degree on the Physicochemical Properties of Oxidized Inulin Polymers oxidized inulin periodate oxidation aldehyde content degree of oxidation and physicochemical properties |
| title | Influence of Oxidation Degree on the Physicochemical Properties of Oxidized Inulin |
| title_full | Influence of Oxidation Degree on the Physicochemical Properties of Oxidized Inulin |
| title_fullStr | Influence of Oxidation Degree on the Physicochemical Properties of Oxidized Inulin |
| title_full_unstemmed | Influence of Oxidation Degree on the Physicochemical Properties of Oxidized Inulin |
| title_short | Influence of Oxidation Degree on the Physicochemical Properties of Oxidized Inulin |
| title_sort | influence of oxidation degree on the physicochemical properties of oxidized inulin |
| topic | oxidized inulin periodate oxidation aldehyde content degree of oxidation and physicochemical properties |
| url | https://www.mdpi.com/2073-4360/12/5/1025 |
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