Premium
Optimization of phosphate recovery from monkfish, Lophius vomerinus , processing by‐products and characterization of the phosphate phases
Author(s) -
Swart Jasmin,
Bordoloi Achinta,
Goosen Neill J
Publication year - 2019
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.9450
Subject(s) - octacalcium phosphate , demineralization , phosphate , chemistry , fourier transform infrared spectroscopy , nuclear chemistry , mineral , precipitation , materials science , chemical engineering , organic chemistry , physics , enamel paint , meteorology , engineering , composite material
BACKGROUND Fish‐processing by‐products represent an increasing proportion of wastes globally. Valorizing offers a sustainable alternative by harnessing high‐value products through process development. This study aimed to develop and optimize a demineralization process to recover minerals from fish bones with subsequent recovery of phosphates from the resulting solution. RESULTS The demineralization process was optimized under the following conditions: 5% H 3 PO 4 concentration (v/v), four extractions and solvent to feed ratio (v/w) of 5:1 at ambient temperature of 17 °C. This resulted in an ossein containing 2.0 ± 1.2 g kg −1 DM ash and 71.5 ± 3 g kg −1 DM hydroxyproline and mineral liquor. The phosphate precipitation from the mineral liquor was further optimized resulting in > 99% total P recovery at 75 °C reaction temperature and 1 mol L −1 Ca(OH) 2 to mineral liquor ratio(v/v) of 0.95:1 for a reaction time of 17 min, per 150 mL starting mineral liquor. The precipitate contained 215.2 ± 3.0 g kg −1 DM dicalcium phosphate dihydrate (DCPD) with a net contribution of 17.2% P from the fishbones, and 25 ± 0.2 g DM of octacalcium phosphate (OCP) was precipitated from 150 mL starting mineral liquor at 25 °C reaction temperature, (1.2:1) 1 mol L −1 Ca(OH) 2 to mineral liquor ratio (v/v) and reaction time of 17 min. The X‐ray spectra confirmed the DCPD structure and Fourier transform infrared spectroscopy (FTIR) spectra indicated OCP precipitation. CONCLUSION This work successfully illustrated the recovery of minerals from fish bones and the subsequent production of different high‐quality phosphates from fish‐processing by‐products, thus indicating a potential source for high‐value products. © 2018 Society of Chemical Industry