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篇名
Codissolution of calcium hydrogenphosphate and sodium hydrogencitrate in water. Spontaneous supersaturation of calcium citrate increasing calcium bioavailability   全文下載 全文下載
並列篇名
Codissolution of calcium hydrogenphosphate and sodium hydrogencitrate in water. Spontaneous supersaturation of calcium citrate increasing calcium bioavailability
作者 Martina Vavrusova (Martina Vavrusova)Bente Pia Danielsen (Bente Pia Danielsen)André Castilho Garcia (André Castilho Garcia)Leif Horsfelt Skibsted (Leif Horsfelt Skibsted)
英文摘要
The sparingly soluble calcium hydrogenphosphate dihydrate, co-dissolving in water during dissolution of freely soluble sodium hydrogencitrate sesquihydrate as caused by proton transfer from hydrogencitrate to hydrogenphosphate, was found to form homogenous solutions supersaturated by a factor up to 8 in calcium citrate tetrahydrate. A critical hydrogencitrate concentration for formation of homogeneous solutions was found to depend linearly on dissolved calcium hydrogenphosphate: [HCitr2 -] = 14[CaHPO4] - 0.05 at 25 ℃. The lag phase for precipitation of calcium citrate tetrahydrate, as identified from FTIR spectra, from these spontaneously formed supersaturated solutions was several hours, and the time to reach solubility equilibrium was several days. Initial calcium ion activity was found to be almost independent of the degree of supersaturation as determined electrochemically. The supersaturated solutions had a pH around 4.7, and calcium binding to hydrogencitrate as the dominant citrate species during precipitation was found to be exothermic with a determined association constant of 357 L mol -1 at 25 ℃ for unit ionic strength, and ΔH° = -22 ± 2 kJ mol -1, ΔS° = -26 ± 8 J K -1 mol -1. Calcium binding to hydrogencitrate and, more importantly, to citrate is suggested to decrease the rate of precipitation by lowering the driving force of precipitation, and becoming important for the robust spontaneous supersaturation with perspectives for design of functional foods with increased calcium bioavailability.
起訖頁 330-336
關鍵詞 Calcium bioavailabilityCalcium citrate supersaturationCalcium supplements
刊名 JOURNAL OF FOOD AND DRUG ANALYSIS  
期數 201801 (26:1期)
出版單位 衛生福利部食品藥物管理署
該期刊-上一篇 Methods for efficient analysis of tocopherols, tocotrienols and their metabolites in animal samples with HPLC-EC
該期刊-下一篇 Metabolic profiling investigation of Fritillaria thunbergii Miq. by gas chromatography-mass spectrometry
 

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