Characteristics of unique HBr-hydrolyzed cellulose nanocrystals from freshwater green algae (Cladophora rupestris) and its reinforcement in starch-based film

Carbohydrate Polymers
Melvir R Sucaldito, Drexel H Camacho

Abstract

Cellulose nanocrystals (CNCs) are promising materials that are readily extracted from plants and other cellulose-containing organisms. In this study, CNCs were isolated from freshwater green algae (Cladophora rupestris) thriving in a volcanic lake, using hydrobromic acid (HBr) hydrolysis. Morphological and structural studies revealed highly crystalline CNCs (94.0% crystallinity index) with preferred orientation to [100] lattice plane as shown by XRD measurements and have an average diameter of 20.0 (±4.4)nm as shown by TEM. Thermal studies showed increased temperature for thermal decomposition of CNCs (381.6°C), which is a result of HBr hydrolysis for CNCs isolation. The isolated CNCs were reinforced into starch based biocomposites via solution casting and evaporation method. Mechanical strength was improved as high as 78% upon addition of 1% cellulose nanocrystals in the films. The produced films are promising materials for their high mechanical strength, biodegradability and availability of raw materials.

Citations

Aug 14, 2020·Brazilian Journal of Biology = Revista Brasleira De Biologia·Gonzalo Flores-MoralesEmmanuel Vega-Román
Nov 11, 2020·Environmental Science and Pollution Research International·Qiu-Yu ChenDe-Ju Cao
Dec 19, 2020·International Journal of Nanomedicine·Silvia TortorellaErica Locatelli
Feb 20, 2021·Environmental Pollution·Rajesh K SrivastavaTejraj M Aminabhavi
Nov 2, 2020·International Journal of Biological Macromolecules·Wanli ZhangWeibo Jiang
May 25, 2021·International Journal of Biological Macromolecules·Ashvinder Kumar RanaVijay Kumar Thakur
Jun 11, 2021·International Journal of Biological Macromolecules·Guihua YangJiachuan Chen
May 15, 2020·International Journal of Biological Macromolecules·Caroline Corrêa de Souza CoelhoLourdes Maria Correa Cabral

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