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Subject: search.filters.subject.Calcium bioavailability

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    Improving calcium bioavailability from fish bone waste: the role of sodium hydroxide in bio‑calcium extraction from tilapia (Oreochromis niloticus) bones
    (2025-10-01)
    Senphan, Theeraphol
    ;
    Mungmueang, Natthapong
    ;
    Choommongkol, Vachira
    ;
    Sriket, Chodsana
    ;
    Kishimura, Hideki
    Calcium deficiency is a global health issue motivating the search for sustainable calcium sources from aquaculture waste. This study investigated sodium hydroxide (NaOH) concentration effects on bio‑calcium quality and bioavailability extracted from tilapia (Oreochromis niloticus) bones. Tilapia bones were treated with 0.5 M, 1 M, and 2 M NaOH solutions for 30 min compared to untreated controls. Increasing NaOH concentrations decreased yield while improving brightness, ash content, and calcium bioavailability. The 2 M NaOH treatment produced bio‑calcium with highest calcium bioavailability (8.57 %), surpassing both control (7.26 %) and commercial calcium carbonate (0.72 %) by 12-fold. Higher NaOH concentrations reduced moisture, protein, and fat contents while increasing hydroxyproline and decreasing lipid oxidation. SEM showed smoother surfaces with homogeneous pores in 2 M NaOH-treated samples. ATR-FTIR and EDS confirmed consistent hydroxyapatite structure. This optimization provides a sustainable approach for converting fish waste into high-bioavailability calcium supplements, supporting circular economy in aquaculture while addressing global calcium deficiency.
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    Physicochemical properties and bioavailability of bio-calcium products from tilapia bone: A comparative study with synthetic hydroxyapatite
    (2025-03-01)
    Arkanit, Kornpaka
    ;
    Senphan, Theeraphol
    ;
    Issapap, Nursakich
    ;
    Mungmueang, Natthapong
    ;
    Sriket, Pornpimol
    This study compared three calcium products derived from tilapia bones (fish bone powder, bio-calcium, and calcined bone) with synthetic hydroxyapatite as a reference material. The chemical compositions, physical properties, and calcium bioavailability were analyzed. The yield percentage decreased from 44.4 % in fish bone powder to 27.4 % in bio-calcium. The yield percentage then increased to 64.9 % in calcined bone. Synthetic hydroxyapatite showed 100 % yield. The ash content increased progressively from 68.5 % to 99.4 %. The calcium content increased from 18.9 % to 31 %, with Ca/P ratios improving from 3.3 to 1.7, approaching the ideal ratio of natural bone mineral (1.67). Heavy metals were not detected in any samples. All products exhibited high whiteness values (L∗ 91.8–95.0). Water activity values ranged from 0.33 to 0.50. The median particle sizes varied between 17.39 and 31.05 μm. Lipid oxidation decreased through the processing stages. Calcium bioavailability was the highest in synthetic hydroxyapatite (5.4 %). Bio-calcium showed 4.1 % bioavailability. The products demonstrated potential for food fortification and biomedical applications. The findings support the use of tilapia bones as a sustainable source of calcium production.