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de Oliveira Begali D, Ferreira LF, de Oliveira ACS, Borges SV, de Sena Neto AR, de Oliveira CR, Yoshida MI, Sarantopoulos CIGL. Effect of the incorporation of lignin microparticles on the properties of the thermoplastic starch/pectin blend obtained by extrusion. Int J Biol Macromol 2021; 180:262-271. [PMID: 33737182 DOI: 10.1016/j.ijbiomac.2021.03.076] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Revised: 03/01/2021] [Accepted: 03/13/2021] [Indexed: 11/25/2022]
Abstract
The present study aimed to produce thermoplastic starch films with different concentrations of thermoplastic pectin and the addition of 4% lignin microparticles as a reinforcing and active agent. The pectin improved the modulus of elasticity, and decreased the elongation at break. In addition, it improved the UV light protection to 100% at 320 nm and 95.9% at 400 nm. The incorporation of lignin microparticles improved the thermal stability of the blends made with 25% and 50% thermoplastic pectin when compared to the pectin-free blends. The blend with 25% thermoplastic pectin led to an increase of 75.8% and 34% in elongation at break and deformation of the films, respectively. This blend also improved the UV light protection to 100% due to its dark brown color. Regarding the permeability properties, the films with 25% and 50% thermoplastic pectin showed lower oxygen permeability (48% and 65%) and an increase in the antioxidant activities from 2.7% to 71.08% and 4.1% to 79.28%, respectively. Thus, the polymer blend with 25% thermoplastic pectin with the incorporation of lignin microparticles proved to be a good alternative for use in foods sensitive to the effects of oxygen and UV light.
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Affiliation(s)
| | - Laura Fonseca Ferreira
- Food Science Department, Federal University of Lavras, P.O. Box 3037, 37200-900 Lavras, MG, Brazil
| | | | - Soraia Vilela Borges
- Food Science Department, Federal University of Lavras, P.O. Box 3037, 37200-900 Lavras, MG, Brazil
| | | | | | - Maria Irene Yoshida
- Department of Chemistry, Federal University of Minas Gerais, 31270-901 Belo Horizonte, MG, Brazil
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Silva LE, Dos Santos ADA, Torres L, McCaffrey Z, Klamczynski A, Glenn G, Sena Neto ARD, Wood D, Williams T, Orts W, Damásio RAP, Tonoli GHD. Redispersion and structural change evaluation of dried microfibrillated cellulose. Carbohydr Polym 2020; 252:117165. [PMID: 33183616 DOI: 10.1016/j.carbpol.2020.117165] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Revised: 09/22/2020] [Accepted: 09/24/2020] [Indexed: 11/29/2022]
Abstract
Commercializing dried microfibrillated cellulose (MFC) has always been a challenge mainly due to the tendency of MFC to aggregate. In this study MFC samples were submitted to drying/redispersion cycles at different temperatures. Morphology, crystallinity and mechanical performance of films were analyzed throughout the cycles. Microscopy images, particle size and stability in water showed that aggregation happens more severely with 5 drying/redispersion cycles and at drying temperatures of 75 and 100 °C. Particles once-dried at 20 °C formed the same size and web-like structure as the MFC-control. Crystallinity and crystallite sizes increased with drying/redispersion cycles especially when dried at 75 and 100 °C, however drying/redispersion cycles also led to a reduction in mechanical performance due to aggregation. While oven-drying is not the most suitable method, milder action at room temperature once-drying led to suspension stability in water, morphology and mechanical properties close to never-dried MFC, which makes this treatment a feasible option to maintain cellulose quality.
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Affiliation(s)
- Luiz Eduardo Silva
- Forest Science Dept., Federal University of Lavras, P.O. Box 3037, 37200-000, Lavras, MG, Brazil.
| | | | - Lennard Torres
- Bioproducts Research Unit, WRRC, ARS-USDA, Albany, CA 94710, USA.
| | - Zach McCaffrey
- Bioproducts Research Unit, WRRC, ARS-USDA, Albany, CA 94710, USA.
| | | | - Greggory Glenn
- Bioproducts Research Unit, WRRC, ARS-USDA, Albany, CA 94710, USA.
| | | | - Delilah Wood
- Bioproducts Research Unit, WRRC, ARS-USDA, Albany, CA 94710, USA.
| | - Tina Williams
- Bioproducts Research Unit, WRRC, ARS-USDA, Albany, CA 94710, USA.
| | - William Orts
- Bioproducts Research Unit, WRRC, ARS-USDA, Albany, CA 94710, USA
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