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Author: search.filters.author.Sriket, ChodsanaSubject: search.filters.subject.Blackchin tilapia

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    Enhanced calcium solubility of bio-calcium powder from blackchin tilapia (Sarotherodon melanotheron) bone: Influence of alkaline pretreatment conditions
    (2026-07-01)
    Senphan, Theeraphol
    ;
    Mungmueang, Natthapong
    ;
    Sazedul Hoque, Md
    ;
    Sriket, Chodsana
    ;
    Benjakul, Soottawat
    Bio-calcium powder was prepared from blackchin tilapia ( Sarotherodon melanotheron ) bones, an invasive species by-product from surimi production in Thailand, to evaluate the effects of alkaline pretreatment on bio-calcium properties. Bones were pretreated with NaOH or KOH (1 and 2 M) at a bone-to-solution ratio of 1:10 (w/v) for 2 h, followed by ethanol washing, hydrogen peroxide bleaching, drying, and grinding to obtain bio-calcium powder. The yield on a wet weight basis was 26–28%, with water activity values of 0.33–0.34 measured at room temperature. Among all treatments, 1 M KOH gave the highest yield (28%), calcium content (26.13%), and lightness (L∗ = 88.5). Collagenous proteins and hydroxyapatite were identified by SDS-PAGE and ATR-FTIR, respectively. All bio-calcium samples showed four to five times higher in vitro calcium solubility after simulated gastrointestinal digestion (13.4-17.50%) than calcium carbonate (3.4%). The 2 M treatments exhibited the highest calcium solubility (17.2-17.50%). The 1 M KOH can be used for food fortification due to its high yield and lightness, whereas the 2 M treatments can serve as calcium supplements where higher calcium solubility is required. Blackchin tilapia bone is a potential source for bio-calcium production, with 1 M KOH suitable for food fortification and 2 M treatments more appropriate for applications requiring higher calcium solubility.
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    Optimization of salt washing protocols for surimi production from invasive blackchin tilapia (Sarotherodon melanotheron): Molecular and functional properties
    (2025-10-01)
    Senphan, Theeraphol
    ;
    Mungmueang, Natthapong
    ;
    Hoque, Md Sazedul
    ;
    Sriket, Chodsana
    ;
    Benjakul, Soottawat
    This study presents the first systematic molecular characterization and protein chemistry optimization for surimi processing from invasive blackchin tilapia (Sarotherodon melanotheron), introducing novel salt washing protocols. Ten treatments were evaluated including conventional washing, single/multiple salt washing (0.3–0.9 % NaCl), and pH-shifting methods. Molecular analyses (SDS-PAGE, ATR-FTIR and SEM) revealed myofibrillar protein preservation and distinct structural modifications. The optimized 0.6 % NaCl protocol achieved selective heme protein removal while preserving myofibrillar integrity, yielding superior gel chemistry (whiteness: 76.47 vs. 71.04) and highest sensory acceptance (7.33 vs. 6.40). pH-shifting enhanced protein recovery (68.59 %) but caused molecular aggregation and network disruption, reducing gel strength by 82 %. Molecular analysis demonstrated that salt washing selectively removes chromoproteins while preserving essential gel-forming proteins, whereas pH-shifting caused protein aggregation. SEM confirmed dense protein matrices in salt-washed samples versus fragmented networks in pH-treated surimi. This chemistry-guided approach transforms invasive species into functional protein ingredients.