Modification of corn starch by oxidation and acetylation
Çelik, Tilbe, author.

Modification of corn starch by oxidation and acetylation

Çelik, Tilbe, author.

Yazar Ek Girişi
Çelik, Tilbe, author.

Fiziksel Tanımlama
ix, 73 leaves: charts;+ 1 computer laser optical disc.

More sustainable and eco-efficiency industries intend to use bio-based raw materials instead of petroleum-based raw materials. Starch is one of the most useful, easily accessible, and cheap bio-based raw materials in the industry. This study aimed to produce modified starch that had proper solution viscosity for coating and low gelling enthalpy to reduce production energy for the adhesive industry. Corn starch was modified by oxidation with sodium hypochlorite (NaOCl), acetylation with acetic anhydride (AA), and a combination of the two (dual modification). The effect of different amounts of oxidants (6.0, 12.0, and 24.0 g Cl/ kg starch) and acetylation agents 7.50, 15.0, 30.0 g AA) on the properties of corn starch was examined at room temperature. The structural characteristics of starch granules were assessed using FTIR, 1H-NMR, DSC, solution viscosity, light transmittance, and SEM microphotographs. The effectiveness values that were identified as carbonyl and carboxyl percentage and degree of substitution (DS) in modified starches were determined. The results showed that increasing oxidant concentration increased the carbonyl and carboxyl percentage to 0.0061 % and 1.33 % but acetyl groups were independent from increasing acetic anhydride concentration. Oxidation had a superior reduction effect on starch solution viscosity with 42% reduction when compared to 22% reduction with acetylation. Both processes reduced the gelling enthalpy, but double modification was more effective. Acetylation had a greater effect on light transmittance. Surface morphology of starch was only affected by active chlorine content at 24.0 g Cl/ kg starch, but all acetic anhydride amounts caused the changes.

Konu Başlığı

Yazar Ek Girişi
Yılmaz, Selahattin,

Tüzel Kişi Ek Girişi
İzmir Institute of Technology. Chemical Engineering.

Tek Biçim Eser Adı
Thesis (Master)--İzmir Institute of Technology:Chemical Engineering.
İzmir Institute of Technology: Chemical Engineering --Thesis (Master).

Elektronik Erişim
Access to Electronic Versiyon.

KütüphaneMateryal TürüDemirbaş NumarasıYer NumarasıDurumu/İade Tarihi
IYTETezT002498TP248.S7 C39 2022Tez Koleksiyonu