Characterization of Calcium Compounds in Opuntia ficus indica as a Source of Calcium for Human Diet

Figure 1

SEM images of cladodes and insoluble dietary fiber of O. ficus indica, (a) calcium oxalate crystals (whewellite) in O. ficus indica cladodes, (b) calcium oxalate crystals (weddellite) in O. ficus indica cladodes, (c) calcium oxalate crystals in insoluble dietary fiber extracted from O. ficus indica, and (d) vessel from the xylem of O. ficus indica with a calcium oxalate crystal (whewellite).

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