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. 2021 Sep 29;11(10):748.
doi: 10.3390/membranes11100748.

Cacao Pod Husk Extract Phenolic Nanopowder-Impregnated Cellulose Acetate Matrix for Biofouling Control in Membranes

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Cacao Pod Husk Extract Phenolic Nanopowder-Impregnated Cellulose Acetate Matrix for Biofouling Control in Membranes

Yusuf Wibisono et al. Membranes (Basel). .

Abstract

The ultrafiltration membrane process is widely used for fruit juice clarification, yet the occurring of fouling promotes a decline in process efficiency. To reduce the fouling potential in the membrane application in food processing, the use of natural phenolic compounds extracted from cocoa pod husk is investigated. The cocoa pod husk extract (CPHE) was prepared in phenolic nanoparticles form and added into the polymer solution at varying concentrations of 0.5 wt%, 0.75 wt%, and 1.0 wt%, respectively. The composite membrane was made of a cellulose acetate polymer using DMF (dimethylformamide) and DMAc (dimethylacetamide) solvents. The highest permeability of 2.34 L m-2 h-1 bar-1 was achieved by 1.0 wt% CPHE/CA prepared with the DMAc solvent. CPHE was found to reduce the amount of Escherichia coli attached to the membranes by 90.5% and 70.8% for membranes prepared with DMF and DMAc, respectively. It is concluded that CPHE can be used to control biofouling in the membrane for food applications.

Keywords: biofouling; cacao pod husk extract; cellulose acetate; composite membranes; phenolic nanoparticles.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Crossflow membrane filtration system.
Figure 2
Figure 2
Particle size and distribution of the CPHE phenolic nanopowder.
Figure 3
Figure 3
Average membrane thickness with different membrane variations.
Figure 4
Figure 4
Cross-sectional membrane sheets observed by SEM (2000 × magnification): (a) Pristine CA membrane (DMAc); (b) 1.0 wt% CPHE/CA composite membrane (DMAc); (c) Pristine CA membrane (DMF); and (d) 1.0 wt% CPHE/CA composite membrane (DMF).
Figure 5
Figure 5
Hydrophilicity of the cellulose acetate membrane sheets.
Figure 6
Figure 6
Tensile strength of the cellulose acetate membrane sheets.
Figure 7
Figure 7
Elongation of the membrane sheets.
Figure 8
Figure 8
Pure water flux measured on each membrane.
Figure 9
Figure 9
Escherichiacoli attachment to the membrane surface: (a) Pristine CA membrane (DMAc); (b) 1.0 wt% CPHE/CA composite membrane (DMAc), (c) Pristine CA membrane (DMF) (d) 1.0 wt% CPHE/CA composite membrane (DMF).
Figure 10
Figure 10
Number of bacteria attached to the membrane.

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