Calcium Phosphate Excipients - Innophos

Calcium and Phosphorus Content
Typical calcium and phosphorus contents of the
calcium phosphates are listed in Table 2 as the
percent by weight for each element. The Ca/P
weight ratios and mole ratios are also given for
comparison. Of the calcium phosphates, tricalcium
phosphate contains the highest calcium content
(38%) and the highest Ca/P weight ratio, 2.2/1.
Table 2
Typical Chemical Analysis
DI-TAB ® A-TAB ® TRI-TAB ® TCP-DC
% Ca (wt) 23.3 29.0 38.0 34.5 – 37.5
% P (wt) 18.1 22.2 17.3 15.6 – 17.4
Ca/P (wt) 1.3/1 1.3/1 2.2/1 2.2/1
Ca/P (mole) 1.0/1 1.0/1 1.7/1 N/A
U.S. RDA: Ca: 800 – 1200 mg, Ca/P wt. ratio 1/1.
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