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Author: search.filters.author.Aenglong, Chakkapat

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    Effect of fortified calcium compounds from oyster shell on the quality of tapioca pearls
    (2025-01-15)
    Meeparn, Parinda
    ;
    Aenglong, Chakkapat
    ;
    Ratanasumawong, Savitree
    ;
    Klaypradit, Wanwimol
    ;
    Kerdpiboon, Soraya
    This study aimed to determine the effect of calcium fortification from dried oyster shells (DOS) and calcined oyster shells (COS) at concentrations of 2, 4 and 6 %(w/w) on physical and chemical properties of tapioca pearls. The results showed that the optimal cooking time of TP-COS decreased compared to TP-DOS and TP (control). The TP-DOS and TP-COS exhibited a remaining calcium content ranging from 8.39 to 41.03 mg/g. During seven days of refrigerated storage, TP-COS showed delayed hardness along with decreases in both the enthalpy of gelatinization and retrogradation. The functional groups observed in TP-DOS and TP-COS showed varying intensities compared to TP. Morphology images depicted the distribution of DOS and COS within tapioca pearls, revealing that TP-DOS and TP-COS possessed a denser and more compact structure. The results suggest that COS fortification could improve the nutritional value and delay the change in the texture of tapioca pearls after storage.
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    Synthesis of soluble calcium compound from skipjack tuna bones using edible weak acids
    (2022-06-01)
    Aenglong, Chakkapat
    ;
    Wang, Yu Ming
    ;
    Limpawattana, Maruj
    ;
    Sukketsiri, Wanida
    ;
    Tang, Qing Juan
    This study aimed to enhance the water solubility of calcium from tuna (Katsuwonus pelamis) bones (TB). Calcium hydroxyapatite (HA) was obtained by calcination of TB. For mineral profiles of TB and HA, Ca had the highest content followed by P with Ca/P of 3.47 and 1.94. Mg, K, and Na as macro minerals and Cr, Cu, Mn, and Zn as micro minerals were also found. Subsequently, HCl was applied to form structured HA-chloride compound (HA-Cl) then reacted with alkaline to obtain structured HA-hydroxide compound (HA-OH). In order to enhance the water solubility, citric and lactic acid were individually reacted with HA-Cl and HA-OH to obtain structured HA-citrate compounds (HA-Cl-Ci and HA-OH-Ci) and structured HA-lactate compounds (HA-Cl-Lac and HA-OH-Lac). HA-Cl-Ci had the highest water solubility (93.34 ± 0.45%) followed by HA-OH-Lac (90.35 ± 0.23%) with Ca/P ratio of 2.28 and 2.24, respectively. HA-Cl-Ci and HA-OH-Lac demonstrated the similar mineral profiles to those of HA but with different contents. The results of FT-IR indicated the carboxyl group of acid played an important role in binding Ca<sup>2+</sup>. X-ray diffractograms indicated that calcined bone was HA whereas the major composition of HA-Cl-Ci and HA-OH-Lac was related to calcium citrate tetrahydrate and calcium lactate pentahydrate, respectively.
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