Use of colorimetric hydrogel as an indicator for food packaging applications

Abstract

A novel hydrogel was synthesized from N ,N-dimethyl acrylamide (DMAAm), gelatin, citric acid (CA) and Basilicum extract (BE). This study was aimed at creating an advanced food packaging material that allows the detection of food spoilage, which can be monitored colorimetrically. The poly(gelatin-co-DMAAm)/CA-BE was synthesized in the form of a film on Petri dishes using a redox polymerization technique. Mechanical and water resistance properties of the hydrogel were further improved by the addition of CA and N ,N-methylene-bis-acrylamide as crosslinkers; BE was added to the reaction mixture and entrapped in the polymer chains with the aim to introduce antimicrobial, antioxidant and anthocyanin properties for the desired utilization. The characterization of the synthesized hydrogel was carried out using a dynamic and mechanical analyser, thermo gravimetric analyser, Fourier transform infrared spectroscopy and scanning electron microscopy. The antimicrobial activity of the hydrogel was observed as it was tested against Escherichia coli, Bacillus subtilis and Staphylococcus aureus. Furthermore, total antioxidant and anthocyanin activities of the hydrogels were also studied at different pH values to monitor the colour change capabilities. It was concluded that the hydrogel was a strong candidate for use in food packaging.

Synthesis and characterization of novel organo-hydrogel based agar, glycerol and peppermint oil as a natural drug carrier/release material

“…Swelling assays were carried out with certain amounts of dried gel, hydrogels, and organo-hydrogels placed in water, ethanol, acetone, ethanol/ID water (1:1), acetone/ID water (1:1) and gasoline and at different pHs (2.0–12.0) for 24 h. Swelling tests were performed at room temperature of 25 °C [ 7 , 30 ].…”

“…Organo-hydrogels consist of low molecular weight materials or polymeric materials that are classified as physical and chemical organo-hydrogels. Chemical polymeric organo-hydrogels are three-dimensional macromolecular structures that absorb water and organic solvents which are more suitable for use in a variety of research including chemistry, biotechnology, medicine and pharmaceuticals [ 3 , [5] , [6] , [7] , [8] ].…”

Application of Poly (Agar-Co-Glycerol-Co-Sweet Almond Oil) Based Organo-Hydrogels as a Drug Delivery Material

“…Swelling assays were carried out with certain amounts of dried gel, hydrogels, and organo-hydrogels placed in water, ethanol, acetone, ethanol/ID water (1:1), acetone/ID water (1:1) and gasoline and at different pHs (2.0–12.0) for 24 h. Swelling tests were performed at room temperature of 25 °C [ 19 , 20 ].…”

“…To evaluate the antioxidant activity, Folin-Ciocalteu [ 22 – 24 ] and ABTS [ 23 , 25 ] methods which were explained in the literature were applied.…”

Application of poly (Agar-co-Glycerol-co-Sweet Almond Oil) based organohydrogels as a Drug Delivery Material

“…Swelling analysis were performed with certain amounts of dried materials placed in ethanol, water, acetone, ethanol/IDwater (1:1), gasoline and acetone/IDwater (1:1) different 2-12 pHs for a day. Swelling tests were performed at 25ºC [18,19].…”