Characterization, Antimicrobial Properties and Coatings Application of Gellan Gum Oxidized with Hydrogen Peroxide.
Yushuang LuXiaojian ZhaoSheng FangPublished in: Foods (Basel, Switzerland) (2019)
The effect of hydrogen peroxide (H₂O₂) oxidation on the physicochemical, gelation and antimicrobial properties of gellan gum was studied. The oxidized gellan gum (OGG) was characterized by measuring the carboxyl/carbonyl group contents, Fourier transform infrared spectroscopy (FTIR) and proton nuclear magnetic resonance (¹H-NMR) spectroscopy. The H₂O₂ oxidation resulted in a large increase in the carboxyl groups in gellan gum. The OGG lost gelation ability by oxidation even in the presence of metal ions. The antimicrobial activities of the OGG against Gram-positive bacteria (Staphylococcus aureus), Gram-negative bacteria (Escherichia coli), and fungal (Aspergillus niger) were tested. The OGG could inhibit the growth of both bacteria and fungal, and the activity was improved with an increase in the oxidation level. Finally, the application of the OGG as an active coatings material to extend the storage of apples was tested.
Keyphrases
- hydrogen peroxide
- staphylococcus aureus
- dna repair
- nitric oxide
- magnetic resonance
- escherichia coli
- dna damage
- biofilm formation
- methicillin resistant staphylococcus aureus
- cell wall
- low density lipoprotein
- gram negative
- quantum dots
- magnetic resonance imaging
- computed tomography
- oxidative stress
- multidrug resistant
- contrast enhanced