Biodegradable sodium alginate films incorporated with norbixin salts

Abstract

Plastic packaging derived from petroleum may have a negative impact on the environment when it is not properly recycled. Some studies present the use of biodegradable packages developed from natural polymers as a sustainable alternative; thus, the present work aimed to develop biodegradable sodium alginate films with antioxidant properties by the incorporation of carotenoid norbixin. Norbixin salts at the concentration of 0.01-0.05% were added to the sodium alginate films complexed with calcium ions. Carotenoid incorporation did not significantly impacted with the moisture content and the swelling capacity of the films. The thickness, water activity, and solubility were higher in the films with 0.05% addition of norbixin salts. The presence of the carotenoid improved the thermal stability of the films, as well as the water vapor barrier properties and lower ultraviolet-visible light transmission. However, the incorporation of 0.03% norbixin salts showed the best result for the analysis of antioxidant activity, with lower formation of oxidation products during sunflower oil storage and potential application for high fat foods. Practical ApplicationsResearchers aim to replace synthetic packaging by eco-friendly packaging. The use of alternative materials such as polysaccharides, proteins, and lipids has been studied for the production of packaging susceptible to degradation under environmental conditions. Thus, the present work developed sodium alginate films complexed with calcium and incorporated with norbixin salts able to decrease sunflower oil oxidation.

Modified Sodium Alginate for Degradable Supramolecular Plastic with High Mechanical Strength

“…The optimal SA to PEG ratio is 4 : 1 at which the mechanical strength of SA/PEG/FeCl 3 reaches the maximum. The maximum breaking strength is 26.5 MPa, which is much higher than those reported in the literature (Tables S1) [9–11,16,28,31] . The breaking strain is 3.6 times of that of the pristine SA film and is comparable to those of the modified sodium alginate film reported previously (Table S2).…”

“…Because of the abundance in nature, easy availability and good degradability, [9][10][11][12][13] sodium alginate is considered as a promising candidate for bioplastic. [14][15][16][17][18][19] In recent years, researches on sodium alginate-based bioplastics have been focused on the addition of various additives (such as cellulose, [20] multi-walled carbon nanotubes [21] ) which may help to improve their mechanical properties or the surface modification (using hydrophobic dodecyltrimethoxysilane, [22] dodecyl glycidyl ether, [23] silica nanoparticles [24] or methyl trimethoxysilane [25] ) which aims to increase its hydrophobicity.…”

Evaluation of diclofenac sodium incorporation in alginate membranes as potential drug release system

“…Crosslinking alginate membranes with CaCl 2 seems to be a strong factor that causes an increase in TS and a decrease in EB [10] , due to Ca 2 + potential to bind polymer chains. Rhim found a TS of 74.9 MPa and an EB of 3.4% for alginate membranes crosslinked by immersion in CaCl 2 2% (w/v) solution, while de Farias et al [26] found TS of 19.84 MPa and EB of 21.26% for alginate 1% (w/v) membranes with glycerol and crosslinked by CaCl 2 1% (w/v) during 5 min. Zactiti and Kieckbusch [27] found TS in a range of 23.11 to 160.26 MPa and EB in a range of 2.16-27.35% depending on the concentration of Ca 2 + solution used and if crosslinking was made in one or two stages.…”

Influence of PH on the properties of sodium alginate films with norbixin salt

“…After drying, 50 ml of a calcium chloride solution (1% w/v) was added to each plate and left for 5 min until the desired cross‐linking was reached. After this period, the liquids were discarded and dried again at 55°C for 45 min (de Farias, Coutinho, Assis, & Rios, 2020). The films without norbixin at a pH of 7.0 and with norbixin at a pH of 3.0, 7.0, and 11.0 were identified as A, B, C, and D, respectively.…”