US 10,494,493 B1 · Nitric oxide-releasing packaging membranes

Abstract

Biodegradable composite membranes with antimicrobial properties consisting of nanocellulose fibrils, chitosan, and S-Nitroso-N-acetylpenicillamine (SNAP) were developed and tested for food packaging applications. Nitric oxide donor, SNAP was encapsulated into completely dispersed chitosan in 100 mL, 0.1N acetic acid and was thoroughly mixed with nanocellulose fibrils (CNF) to produce a composite membrane. The fabricated membranes had a uniform dispersion of chitosan and SNAP within the nanocellulose fibrils, which was confirmed through Scanning Electron Microscopy (SEM) micrographs and chemiluminescence nitric oxide analyzer. The membranes prepared without SNAP showed lower water vapor permeability than that of the membranes with SNAP. The addition of SNAP resulted in a decrease in the Young's modulus for both 2-layer and 3-layer membrane configurations. Antimicrobial property evaluation of SNAP incorporated membranes showed an effective zone of inhibition against bacterial strains of Enterococcus faecalis, Staphylococcus aureus, and Listeria monocytogenes and demonstrated its potential applications for food packaging.

Claims16

Dependent claims

A multilayer packaging film comprising

at least one layer comprising:
an antibacterially effective amount of a monomer or polymer comprising an S-nitrosothiol group, wherein the weight percent of the monomer or polymer is from about 0.1% to about 10%;
and
about 90-99.9 weight percent of a biodegradable polymer comprising a nanocelluslose and a chitosan, wherein the weight ratio of chitosan to nanocellulose is from 10:1 to 1:10.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

15/595,897Filed 15 May 2017 · us provisional application

Priority

13 May 2016

Granted

3 Dec 2019

Term ends

Not estimatedThe source records don’t support an estimate.

Classification42 codes

B65D 65/466
Applications of disintegrable, dissolvable or edible materials: bio- or photodegradable packaging materials
C08J 5/2256
Synthetic macromolecular compounds: based on macromolecular compounds obtained by reactions other than those involving carbon-to-carbon bonds,…
B32B 9/02
Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00: comprising animal or vegetable…
B32B 23/08
Comprising such cellulosic plastic substance as the main or only constituent of a layer, which is next to another layer of the same or of a…: of…

Nitric oxide-releasing packaging membranes

Life of this patent

Nitric oxide-releasing packaging membranes

Life of this patent

Abstract

Claims16