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Preparation, characterization and antibacterial activity of octenyl succinic anhydride modified inulin.

Abstract：

:Octenyl succinic anhydride modified inulin (In-OSA) was synthesized via chemical modification of inulin with octenyl succinic anhydride (OSA). The esterification of inulin with OSA was confirmed by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and degree of substitution (DS) calculation. Antibacterial activity of In-OSA against Staphylococcus aureus and Escherichia coli was investigated by minimum inhibitory concentration (MIC) and inhibition rate determination. The results showed that inhibition rates against both E.coli and S. aureus increased with the increase of the In-OSA concentration. And the MICs against E. coli and S. aureus were 1% and 0.5% (w/v), respectively. The antibacterial mechanism was analyzed with the results of the proteins and nucleic acids leakage, SEM and negative staining transmission electron microscopy (TEM). Both the leakages of proteins and nucleic acids increased with the increase of the In-OSA concentration. The leakage occurred mainly in the early stage which indicated that cell membrane and wall were destroyed by In-OSA quickly. The images of SEM and negative staining TEM suggested that the cell membranes and cell walls of S. aureus were damaged more severely and even destroyed completely; but only pores appeared on the surface of E. coli.

journal_name

Int J Biol Macromol

journal_title

International journal of biological macromolecules

authors

Zhang X,Zhang YW,Zhang H,Yang Q,Wang H,Zhang G

doi

10.1016/j.ijbiomac.2015.03.067

subject

Has Abstract

pub_date

2015-01-01 00:00:00

pages

79-86

eissn

0141-8130

issn

1879-0003

pii

S0141-8130(15)00220-2

journal_volume

78

pub_type

杂志文章

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