Preparation of chitosan-glucosamine derivatives (Maillard reaction products) by gamma Co-60 irradiation method and investigation of antibacterial activity

The mixture solutions of glucosamine and chitosan with different molecular weights(123.5; 40.7 and 6.1 kDa) were irradiated by Co-60 gamma ray at dose of 50 kGy to prepare chitosanglucosamine Maillard reaction products (MRPs). The formation of MRPs was determined by measuring UV absorbance (at 284) nm and browning (at 420 nm). The reaction efficiency was calculated based on the ratio of reacted glucosamine and total added glucosamine. The antibacterial activity of chitosan-glucosamine MRPs against Escherichia coli was also investigated. The obtained results showed that the chitosan-glucosamine MRPs exhibited strong antibacterial activity, in which chitosan-glucosamine MRPs prepared from 123.5 kDa chitosan could reduce up to 4 log CFU/ml in comparison with the control (45 × 106 CFU/ml). Therefore, the chitosan-glucosamine MRPs prepared by the Co-60 gamma irradiation method can be potentially applied as a natural preservative for food, cosmetics and substituted for banned chemical preservatives.

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Novel Antibacterial Peptides Isolated from the Maillard Reaction Products of Half-Fin Anchovy (Setipinna taty) Hydrolysates/Glucose and Their Mode of Action in Escherichia coli

Marine Drugs ◽

10.3390/md17010047 ◽

2019 ◽

Vol 17 (1) ◽

pp. 47 ◽

Cited By ~ 5

Author(s):

Jiaxing Wang ◽

Rongbian Wei ◽

Ru Song

Keyword(s):

Escherichia Coli ◽

Antibacterial Activity ◽

Liquid Chromatography ◽

Maillard Reaction ◽

Size Exclusion ◽

H2o2 Production ◽

Maillard Reaction Products ◽

Reaction Products ◽

E Coli ◽

Production Of Hydrogen

The Maillard reaction products (MRPs) of half-fin anchovy hydrolysates and glucose, named as HAHp(9.0)-G MRPs, were fractionated by size exclusion chromatography into three major fractions (F1–F3). F2, which demonstrated the strongest antibacterial activity against Escherichia coli (E. coli) and showed self-production of hydrogen peroxide (H2O2), was extracted by solid phase extraction. The hydrophobic extract of F2 was further isolated by reverse phase-high performance liquid chromatography into sub-fractions HE-F2-1 and HE-F2-2. Nine peptides were identified from HE-F2-1, and two peptides from HE-F2-2 using liquid chromatography-electrospray ionization/multi-stage mass spectrometry. Three peptides, FEDQLR (HGM-Hp1), ALERTF (HGM-Hp2), and RHPEYAVSVLLR (HGM-Hp3), with net charges of −1, 0, and +1, respectively, were synthesized. The minimal inhibitory concentration of these synthetic peptides was 2 mg/mL against E. coli. Once incubated with logarithmic growth phase of E. coli, HGM-Hp1 and HGM-Hp2 induced significant increases of both extracellular and intracellular H2O2 formation. However, HGM-Hp3 only dramatically enhanced intracellular H2O2 production in E. coli. The increased potassium ions in E. coli suspension after addition of HGM-Hp1 or HGM-Hp2 indicated the destruction of cell integrity via irreversible membrane damage. It is the first report of hydrolysates MRPs-derived peptides that might perform the antibacterial activity via inducing intracellular H2O2 production.

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Analysis on antibacterial activities and volatile compounds of Maillard reaction products derived from squid skin

E3S Web of Conferences ◽

10.1051/e3sconf/202014501028 ◽

2020 ◽

Vol 145 ◽

pp. 01028

Author(s):

Lili Ji ◽

Yan Zhang ◽

Wendong Song ◽

Lu Cai ◽

Yaning Wang ◽

...

Keyword(s):

Escherichia Coli ◽

Volatile Compounds ◽

Maillard Reaction ◽

Antioxidant Activities ◽

Food Additives ◽

Antibacterial Activities ◽

Maillard Reaction Products ◽

Reaction Products ◽

Synthetic Antioxidant ◽

Predominant Component

Maillard reaction products (MRPs) could offer flavor and aroma for food, and also render functional characteristics. In this work, three squid skin Maillard reaction products with glucose (GSS), fructose (FSS) and lactose (LSS) were prepared, whose volatile compounds were analyzed by gas chromatography-mass spectrometer. And the antibacterial activities of three Maillard reaction products against Escherichia coli, methicillin-resistant Staphylococcus aureus and Vibrio harveyi were investigated. The results showed that the volatile compounds of squid skin MRPs mainly contained alcohol, acid, phenol, ester, aldehyde, alkane, alkene, amide and ester, among which alcohol was the predominant component in the GSS and LSS, accounting for 53.87±6.02 % and 83.67±3.64%, respectively, however, acid was predominant component in the FSS, accounting for 54.19±3.38 %. Surprisingly, 2, 6-di-tert-butyl-4-methylphenol (BHT), as a synthetic antioxidant, was firstly identified in these three MRPs, which directly indicated squid skin MRPs have antioxidant activities. It is demonstrated that the antibacterial abilities of LSS and GSS were superior to that of FSS, and Escherichia coli was the most sensitive to the three MRPs among the three tested bacteria. This study demonstrates squid skin MRPs possess antioxidant and antibacterial abilities, which shows promising and far-ranging prospect in the fields of food additives.

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