Green Tea Extract Enrichment: Mechanical and Physicochemical Properties Improvement of Rice Starch-Pectin Composite Film

Abstract

The effects of green tea extract (GTE) at varying concentrations (0.000, 0.125, 0.250, 0.500, and 1.000%, w/v) on the properties of rice-starch-pectin (RS-P) blend films were investigated. The results showed that GTE addition enhanced (p < 0.05) the antioxidation properties (i.e., total phenolic content, DPPH radical scavenging activity, and ferric reducing antioxidant power) and thickness of the RS-P composite film. The darker appearance of the RS-T-GTE blend films was obtained in correspondence to the lower L* values. However, the a* and b* values were higher toward red and yellow as GTE increased. Though GTE did not significantly alter the film solubility, the moisture content and the water vapor permeability (WVP) of the resulting films were reduced. In addition, the GTE enrichment diminished the light transmission in the UV-Visible region (200–800 nm) and the transparency of the developed films. The inclusion of GTE also significantly (p < 0.05) lowered the tensile strength (TS) and elongation at break (EAB) of the developed film. The FT-IR spectra revealed the interactions between RS-P films and GTE with no changes in functional groups. The antimicrobial activity against Staphylococcus aureus (TISTR 764) was observed in the RS-P biocomposite film with 1% (w/v) GTE. These results suggested that the RS-P-GTE composite film has considerable potential for application as active food packaging.

Dragon Fruit Peel Extract Enriched-Biocomposite Wrapping Film: Characterization and Application on Coconut Milk Candy

“…These weak intermolecular bonding led to a weaker film structure, thus reducing the tensile strength and flexibility of the DPE-incorporated film. Decreases in TS and EAB were noticed in cassava starch (CS) and sodium carboxymethyl cellulose (CMC) edible films with apple polyphenols [ 62 ] and in a rice starch-pectin composite film incorporating green tea extract [ 63 ]. A decreasing EAB was also observed in gelatin-based films with mango peel extract [ 27 ].…”

“…So, the FS values were not significantly affected. However, when compared to the FS of a green tea extract-infused biocomposite film [ 63 ], the FS of all the DPE-enriched biocomposite films was significantly higher, which suggested that DPE-incorporated films might not be suitable for application in packaging high-moisture foods.…”

Packaging Materials Based on Styrene-Isoprene-Styrene Triblock Copolymer Modified with Graphene

“…The large variety of the compounds possessing the inhibition ability upon polymer degradation, namely synthesis antioxidants such as hindered phenols [ 2 , 3 ], natural extracts [ 4 , 5 ], inorganic structures as oxides [ 6 ], polyhedral oligomeric silsesquioxane (POSS) [ 7 , 8 ], complexes [ 9 ] or multicomponent blends [ 10 ] radiation crosslinking [ 11 , 12 ] have been investigated. The problem regarding the improvement of the polymer stability in the presence of antioxidants appears as the background requirement for new applications involving the long-life operation under severe conditions [ 13 , 14 ], the recycling [ 15 ] or food handling [ 16 , 17 ].…”

Production of Thermoplastic Starch-Aloe vera Gel Film with High Tensile Strength and Improved Water Solubility

“…Thus, biopolymers were seen as an alternative to producing plastic and have garnered much attention. Starch is the most common biopolymer feedstock for producing films and coatings [ 4 ] and is extensively covered in the literature as the primary material for the implementation of active food packaging [ 5 , 6 , 7 ]. According to Charles et al [ 8 ], potato peel starch can be used in the packaging of chilled and frozen foods.…”