Preparation and Structural Properties of Bacterial Nanocellulose Obtained from Beetroot Peel Medium

Sunčica Beluhan (), Filip Herceg, Andreja Leboš Pavunc and Senka Djaković
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Sunčica Beluhan: Faculty of the Food Technology and Biotechnology, University of Zagreb, Pierottijeva 6, 10000 Zagreb, Croatia
Filip Herceg: Pfizer Croatia d.o.o., Slavonska Avenija 6, 10000 Zagreb, Croatia
Andreja Leboš Pavunc: Faculty of the Food Technology and Biotechnology, University of Zagreb, Pierottijeva 6, 10000 Zagreb, Croatia
Senka Djaković: Faculty of the Food Technology and Biotechnology, University of Zagreb, Pierottijeva 6, 10000 Zagreb, Croatia

Energies, 2022, vol. 15, issue 24, 1-23

Abstract: The aim of the present study was to investigate structural modifications and physicochemical properties of bacterial nanocellulose (BNC) pellicles produced statically in a beetroot peel medium as a mixture of C-sources (8% sucrose, 2% glucose, and 0.86% fructose). Characteristics of these BNC samples were compared to those produced using a chemically defined and modified Hestrin–Schramm medium with 3% ( w / v ) glucose, fructose, and sucrose as sole carbon sources. Compared with the beetroot peel medium, where 11.57 g/L BNC (wet weight) was obtained, glucose gave the highest BNC yield (13.07 g/L), sucrose 10.55 g/L, and fructose 7.9 g/L. FT-IR spectra showed almost identical chemical profiles assigned to cellulose I. XRD analysis revealed that the BNC produced in beetroot peel medium had a larger crystallite size than other BNC samples. The crystallinity index of beetroot peel BNC was higher than that of Hestrin–Schramm BNC. The water-holding capacity, water release rate, and iodine sorption value from the beetroot peel medium were greater than those of other BNCs. Furthermore, as there is a necessity today to find cheaper carbon sources to obtain valuable products at a lower cost, beetroot peels represent an interesting alternative to producing BNC as a new functional material for industrial applications.

Keywords: bacterial nanocellulose (BNC); beetroot peels; agroindustrial wastes; crystal structure; water-holding capacity (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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