Direct Complexometric Titration of Calcium Phosphates

Tuckerman, Murray M.; Ramos, M. Eleanor Sanchez de

doi:10.1002/jps.2600660938

Cited by 3 publications

(1 citation statement)

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“…Therefore, this article is about automatic direct titration of CDTA. Another approach to reduce calcium phosphate precipitation and thus improve endpoint detection is to use triethanolamine ( Figure 1 b) as an auxiliary complexing agent [ 37 ]. Triethanolamine (TEA) forms mild complexes with calcium ions and modifies the surface of poorly soluble calcium salts.…”

Section: Introductionmentioning

confidence: 99%

Determination of Calcium in Meat Products by Automatic Titration with 1,2-Diaminocyclohexane-N,N,N’,N’-tetraacetic Acid

Shyichuk,

Kowalska,

Shyychuk

et al. 2023

Molecules

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Mechanically separated meat (MSM) is a by-product of the poultry industry that requires routine quality assessment. Calcium content is an indirect indicator of bone debris in MSM but is difficult to determine by EDTA titration due to the poor solubility of calcium phosphate. Therefore, 1,2-diaminocyclohexane-N,N,N’,N’-tetraacetic acid was used instead, which has two orders of magnitude higher affinity for calcium ions. In addition, the auxiliary complexing agents triethanolamine and Arsenazo III, an indicator that is sensitive to low calcium concentrations, were used. Automatic titration endpoint detection was performed using an immersion probe at 660 nm. It has been shown that the color change in Arsenazo III can also be read with an RGB camera. The CDTA titration procedure has been tested on commercial Bologna-type sausages and the results were in line with AAS and ICP reference data. The content of calcium in sausages turned out to be very diverse and weakly correlated with the content of MSM. The tested MSM samples had a wide range of calcium content: from 62 to 2833 ppm. Calcium-rich poultry by-products include fat and skin (115 to 412 ppm), articular cartilage (1069 to 1704 ppm), and tendons (532 to 34,539 ppm). The CDTA titration procedure is fully suitable for small meat processing plants due to its simplicity of use and low cost.

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Section: Introductionmentioning

confidence: 99%