The manufacture of composite biofilms alginate and LM-pectin crosslinked with calcium ions requires a two-step contact Ca2+: initially low-structured pre-film is formatted which further in second more concentrated Ca2+ solution containing plasticizer. This research evaluated the influence plasticizer (glycerol) concentration (1–15% w/v) this finishing reticulation step on final films characteristics. results indicated that extent simultaneous crosslinking plasticization glycerol was...

The use of natural plasticizers with low toxicity and good compatibility in several polymer applications has become more attractive. In this study, a plasticizer was synthesized the laboratory by esterification rice fatty acids polyols. resulting product added to PVC rubber latex films (5% w/w). Mechanical properties films, as well tests migration exudation plasticizer, were performed order evaluate efficiency plasticization. Optical microscopy (OM), X-ray diffraction (XRD), Fourier...

The antimicrobial potential of alginate films (AFs) and alginate/chitosan composite with two different mass proportions the biopolymers, 82.5:17.5 (CF1) 65:35 (CF2), containing potassium sorbate (KS) or natamycin was evaluated. At practical limit KS addition (0.17 g per gram alginate) for pure AFs, no inhibition zones were observed against Debaromyces hansenii, Penicillium commune roqueforti by agar diffusion test. Above this concentration, became opaque, brittle showed a whitish precipitate...

BACKGROUND Single-cell lipids are obtained from microorganisms, including some species of microalgae, which under specific growth conditions able to accumulate in their biomass. Some Desmodesmus, a chlorophyceae considered potential sources and different cultivation systems, heterotrophic wastewater, have been proposed. This study evaluated the effect temperature on lipid productivity Desmodesmus subspicatus sugarcane processing wastewater extraction by supercritical carbon dioxide (SC-CO2)....

Abstract In recent years, much research effort has been driven to develop alternative plasticizers for medical and commodity plastic materials. this study, a modified natural plasticizer, synthesized by esterification of rice fatty acids, was epoxidation with peroxy acid generated in situ . Two epoxidized were obtained, using peracetic (NP‐Ac) peroctanoic (NP‐Oc) as reagent. PVC films after addition these presented fairly good incorporation plasticizing performance, demonstrated results...

Abstract The effect of drying conditions the film-forming solution on thickness, moisture content, water vapor permeability, and tensile properties alginate films were investigated. A long period constant rate was observed in all model proposed by Wang Singh able to adjust data. As expected, there a clear temperature kinetics; that is, increasing decreased time. Considerable glycerol losses when gel oven dried at temperatures above 40°C. Compared other conditions, 60°C thinner, had lower...

This study includes the synthesis of a new natural plasticizer obtained through esterification reaction rice fatty acid and polyols, its physicochemical characterization preliminary application in polyvinyl chloride (PVC). Monopropylene glycol, octanol diethylene glycol were used as polyols for reaction. Catalyst Fascat® 4100, was also added. Viscosity, acidity hydroxyl index, moisture content, molar mass, chemical composition (by FTIR) color determined to characterize synthesized. The...

Summary In antimicrobial active films, the agent is incorporated in polymeric matrix and released from film to product surface where most deterioration processes take place. this study, films structured solely by alginate blends of alginate:chitosan (82.5:17.5 65:35) were obtained casting. The formulations received natamycin (4 8 g/100 g biopolymer) as agent. Films characterised according their thickness morphology. Diffusion experiments water indicated very slow release kinetics...

Abstract Air drying of camu-camu slices was performed in order to estimate the effect air temperature on kinetics ascorbic acid thermal degradation. Moisture variation during process monitored gravimetrically by weighing trays at predetermined time intervals. The experimental points were adjusted Fick's diffusion model and Page empirical model. effective coefficient (Deff) ranged from 8.48 × 10−10 1.34 10−9 m2/s.The content evaluated samples taken using Iodine titration, results modeled...

The authors report the preparation of chitosan membranes associated with extract unripe banana peel. Extracts were prepared by decoction, using boiling distilled water. extraction process was repeated three times. First and third extracts served as solvent to prepare evaporation technique. first peel exhibit good flexibility, transparency, uniformity. Scanning Electron Microscopy images showed dense membranes. Brownish color observed due presence tannins, which confirmed Infrared...

ABSTRACT: The harmful effects caused by the use of toxic substances in agriculture have led to development alternative solutions, and researchers focused on understanding effectiveness potential plant extracts agriculture. aim this systematic review was understand situation research scientific dissemination, as well how current science has approached agriculture, especially seed applications. There is demonstrated a high number publications over last ten years, years 2018, 2019 2020, Brazil...