Abstract
Citrus juices from whole oranges and grapefruits (discarded from open market) and aqueous extracts from citrus processing waste (mainly peels) were used for bacterial cellulose production by Komagataeibacter sucrofermentans DSM 15973. Grapefruit and orange juices yielded higher bacterial cellulose concentration (6.7 and 6.1 g/L, respectively) than lemon, grapefruit, and orange peels aqueous extracts (5.2, 5.0, and 2.9 g/L, respectively). Compared to the cellulosic fraction isolated from depectinated orange peel, bacterial cellulose produced from orange peel aqueous extract presented improved water-holding capacity (26.5 g water/g, 3-fold higher), degree of polymerization (up to 6-fold higher), and crystallinity index (35–86% depending on the method used). The presence of absorption bands at 3240 and 3270 cm–1 in the IR spectrum of bacterial cellulose indicated that the bacterial strain K. sucrofermentans synthesizes both Iα and Iβ cellulose types, whereas the signals in the 13C NMR spectrum demonstrated that Iα cellulose is the dominant type.
Highlights
Escalating negative environmental and societal concerns associated with utilizing traditional petrochemical processes for chemical, polymer, and material production have paved the way toward a bioeconomy era using renewable resources instead
This study evaluates the synthesis and characterization of bacterial cellulose using aqueous extracts from solid citrus processing waste or whole fruits discarded as waste from open markets
Citrus juices from whole fruits discarded from open markets and aqueous extracts from solid citrus waste (SCW) were evaluated for their efficiency for bacterial cellulose production by the bacterial strain Komagataeibacter sucrofermentans DSM 15973
Summary
Escalating negative environmental and societal concerns associated with utilizing traditional petrochemical processes for chemical, polymer, and material production have paved the way toward a bioeconomy era using renewable resources instead. This study evaluates the synthesis and characterization of bacterial cellulose using aqueous extracts from solid citrus processing waste or whole fruits discarded as waste from open markets.
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