Characterization of biopolymer membranes and films: Physicochemical, mechanical, barrier, and biological properties

Tomoda, Bruno Thorihara; Yassue-Cordeiro, Patrícia Hissae; Ernesto, Júlia Vaz; Lopes, Patrícia S.; Péres, Laura O.; Silva, Classius Ferreira da; Moraes, Mariana Agostini de

doi:10.1016/b978-0-12-818134-8.00003-1

Cited by 31 publications

(19 citation statements)

References 79 publications

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“…During processing anthocyanins are highly unstable therefore it is critical to investigate the accelerated thermal stability of encapsulated Natal plum anthocyanins before incorporating them into foods. The thermogravimetric analysis investigates the thermal degradation of a sample due to mass loss over a given temperature range [ 29 ]. The samples were heated from 10 °C to 900 °C, and the mass loss of the beads is represented in Figure 5 A–D.…”

Section: Resultsmentioning

confidence: 99%

In Vitro Release of Anthocyanins from Microencapsulated Natal Plum (Carissa macrocarpa) Phenolic Extract in Alginate/Psyllium Mucilage Beads

Seke

Manhivi

Slabbert

et al. 2022

Foods

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Natal plum (Carissa macrocarpa) contains anthocyanins, cyanidin 3-O-β-sambubioside (Cy-3-Sa), and cyanidin 3-O-glucoside (Cy-3-G) that possess great bioactive properties. During in vitro gastrointestinal digestion, Cy-3-Sa and Cy-3-G are highly sensitive to pH changes and have low bioaccessibility rates of 7.9% and 22%, respectively. This study aimed to therefore use microencapsulation techniques to improve the bioaccessibility of Cy-3-Sa and Cy-3-G. The crude anthocyanin-rich extract was extracted from freeze-dried Natal plum fruit using ultrasonic-assisted ethanol extraction. The anthocyanin-rich extract was encapsulated using the ionic gelation method. Four distinct carrier agents, namely sodium alginate, pectin, xanthan gum and psyllium mucilage were used to form the wall materials. Encapsulation efficiency was highest for alginate/psyllium mucilage beads (93.67%), while alginate showed the least efficiency (86.80%). Scanning Electron Microscopy revealed a cracked and porous structure for the Natal plum extract and a continuous smooth structure for all the beads. Fourier transform infrared spectroscopy showed peaks at 3300 and 1610 cm−1, confirming the presence of polyphenols and polysaccharides in all beads. Thermal stability was higher for the alginate/psyllium mucilage beads and the observed thermal transitions were due to the bonds formed between the polymers and the polyphenols. Alginate beads combined with xanthan gum, pectin, and psyllium mucilage showed a prolonged release of anthocyanins compared to alginate in vitro alone. The highest anthocyanin bioaccessibility was obtained from alginate/psyllium mucilage beads (85.42 ± 1.03%). The results showed the effectiveness of alginate/psyllium mucilage beads in improving stability and in vitro anthocyanin release.

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Section: Resultsmentioning

confidence: 99%

In Vitro Release of Anthocyanins from Microencapsulated Natal Plum (Carissa macrocarpa) Phenolic Extract in Alginate/Psyllium Mucilage Beads

Seke

Manhivi

Slabbert

et al. 2022

Foods

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“…65 Even though TGA is a low cost, it is a destructive method, and it might not be accurate due to the presence of volatile components in the sample. 66…”

Section: Characterization Of Bionanocompositesmentioning

confidence: 99%

“…65 Even though TGA is a low cost, it is a destructive method, and it might not be accurate due to the presence of volatile components in the sample. 66 Rashid et al prepared olive/bamboo fibre-based epoxy hybrid composites and they examined their properties by TGA, DMA and TMA. 67 They reported that the hybrid fibre composites fabricated showed higher thermal stability than the bare composite because the treatment of fibre with an alkali solution could enhance the chemical surface and improve the thermal stability.…”

Section: Mechanical Characterization Of Bionanocompositesmentioning

confidence: 99%

Surface and mechanical characterization of bionanocomposites for advanced applications: A review

Kurukavak

2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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In recent years, nanocomposites prepared by dispersing biopolymer with nanofillers (bionanocomposites) have attracted a growing attention, since they present remarkable electrical, optical, mechanical and thermal properties, which make them useful for various technological applications. However, the understanding of the diversity of application areas of bionanocomposites can only be specified by advanced characterization techniques. As well known, the illumination of the main characteristics of bionanocomposites makes them more eligible for their potential use. Therefore, the characterization techniques given in this review fall into the two main categories: the morphological and mechanical characterizations. Morphological characterization techniques presented include the most popular techniques atomic force microscopy, scanning electron microscopy and transmission electron microscopy. Mechanical characterization techniques presented here include tensile test and dynamic mechanical analysis. Additionally, thermal stability bionanocomposites determined by thermogravimetric analysis is briefly touched.

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“…To detect thermal stability and weight reduction, a commercial TGA was used to thermally decompose milligram samples under monitored heating and environmental conditions in an atmosphere of air or inert nitrogen. In biopolymer films, TGA is a valuable instrument for testing the incorporation of nanoparticles and active compounds into biopolymer films or membranes by measuring the rise or decrease in thermal degradation peaks as well as determining the quickest or delayed thermal degradation [104].…”

Section: Thermogravimetric Analysers (Tg)mentioning

confidence: 99%

Thermal Analysis Technologies for Biomass Feedstocks: A State-of-the-Art Review

et al. 2021

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An effective analytical technique for biomass characterisation is inevitable for biomass utilisation in energy production. To improve biomass processing, various thermal conversion methods such as torrefaction, pyrolysis, combustion, hydrothermal liquefaction, and gasification have been widely used to improve biomass processing. Thermogravimetric analysers (TG) and gas chromatography (GC) are among the most fundamental analytical techniques utilised in biomass thermal analysis. Thus, GC and TG, in combination with MS, FTIR, or two-dimensional analysis, were used to examine the key parameters of biomass feedstock and increase the productivity of energy crops. We can also determine the optimal ratio for combining two separate biomass or coals during co-pyrolysis and co-gasification to achieve the best synergetic relationship. This review discusses thermochemical conversion processes such as torrefaction, combustion, hydrothermal liquefaction, pyrolysis, and gasification. Then, the thermochemical conversion of biomass using TG and GC is discussed in detail. The usual emphasis on the various applications of biomass or bacteria is also discussed in the comparison of the TG and GC. Finally, this study investigates the application of technologies for analysing the composition and developed gas from the thermochemical processing of biomass feedstocks.

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Characterization of biopolymer membranes and films: Physicochemical, mechanical, barrier, and biological properties

Cited by 31 publications

References 79 publications

In Vitro Release of Anthocyanins from Microencapsulated Natal Plum (Carissa macrocarpa) Phenolic Extract in Alginate/Psyllium Mucilage Beads

In Vitro Release of Anthocyanins from Microencapsulated Natal Plum (Carissa macrocarpa) Phenolic Extract in Alginate/Psyllium Mucilage Beads

Surface and mechanical characterization of bionanocomposites for advanced applications: A review

Thermal Analysis Technologies for Biomass Feedstocks: A State-of-the-Art Review

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