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Polysaccharides, Volume 5, Issue 4 (December 2024) – 2 articles

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17 pages, 2756 KiB  
Article
Biopolymer from Annona muricata Residues as a Potential Sustainable Raw Material for Industrial Applications
by Igor F. S. Ramos, Samuel C. Dias, Talissa B. C. Lopes, Francisco T. dos S. Silva Júnior, Ricardo de Araújo, Stanley J. C. Gutierrez, Claudia Pessoa, Josy A. Osajima, Marcia S. Rizzo, Edson C. Silva-Filho, Manuela Amorim, Óscar Ramos, Alessandra B. Ribeiro and Marcilia P. Costa
Polysaccharides 2024, 5(4), 523-539; https://doi.org/10.3390/polysaccharides5040033 - 26 Sep 2024
Abstract
Annona muricata is a fruit species belonging to the Annonaceae family, which is native to the warmer tropical areas of North and South America. A large amount of discarded residue from A. muricata is of interest for obtaining new industrial inputs. To propose [...] Read more.
Annona muricata is a fruit species belonging to the Annonaceae family, which is native to the warmer tropical areas of North and South America. A large amount of discarded residue from A. muricata is of interest for obtaining new industrial inputs. To propose the applications of the biopolymer from A. muricata residues (Biop_AmRs), this study aimed to characterize this input chemically and functionally, as well as to evaluate its potential for hemocompatibility and cytotoxicity activity in vitro. Biop_AmRs is an anionic heteropolysaccharide composed of glucose, arabinose, xylose, galactose, mannose, uronic acid, and proteins. This biopolymer exhibited a semicrystalline structure and good thermal stability. Biop_AmRs exhibited excellent water holding capacity, emulsifying properties, and mucoadhesiviness and demonstrated hemocompatibility and cytocompatibility on the L929 cell line. These results indicate possible applications for this biopolymer as a potential environmentally friendly raw material in the food, pharmaceutical, biomedical, and cosmetic industries. Full article
(This article belongs to the Topic Polymers from Renewable Resources, 2nd Volume)
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19 pages, 13812 KiB  
Article
Structural and Thermal Characterization of Some Thermoplastic Starch Mixtures
by Maria Daniela Stelescu, Ovidiu-Cristian Oprea, Maria Sonmez, Anton Ficai, Ludmila Motelica, Denisa Ficai, Mihai Georgescu and Dana Florentina Gurau
Polysaccharides 2024, 5(4), 504-522; https://doi.org/10.3390/polysaccharides5040032 - 24 Sep 2024
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Abstract
The paper presents the production of thermoplastic starch (TPS) mixtures using potato starch and two types of plasticizers: glycerol and sorbitol. The effects of plasticizers, citric acid, organically modified montmorillonite clay nanofiller (OMMT) and an additive based on ultrahigh molecular weight siloxane polymer [...] Read more.
The paper presents the production of thermoplastic starch (TPS) mixtures using potato starch and two types of plasticizers: glycerol and sorbitol. The effects of plasticizers, citric acid, organically modified montmorillonite clay nanofiller (OMMT) and an additive based on ultrahigh molecular weight siloxane polymer on the structure and physical–mechanical and thermal properties of TPS samples were analysed. Starch mixtures plasticized with glycerol were obtained, where the starch/glycerol mass ratio was 70:30, as well as starch mixtures plasticized with glycerol and sorbitol, with a starch/glycerol/sorbitol mass ratio of 60:20:20. The starch gelatinization process to obtain TPS was carried out in a Brabender Plasti-Corder internal mixer at 120 °C, with a mixing speed of 30–80 rpm, for 10 min. The obtained results indicate that by adding 2% (weight percentage) of citric acid to the TPS mixtures, there is an improvement in the physical–mechanical properties, as well as structural changes that can indicate both cross-linking reactions by esterification in stages and depolymerisation reactions. The sample of TPS plasticized with glycerol, which contains OMMT, shows an increase in tensile strength by 34.4%, compared to the control sample. Full article
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