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. 2021 Aug 4;20:76. doi: 10.1186/s12938-021-00916-1

Fig. 1.

Fig. 1

Evaluation of the purity of the extracted hydroxyapatite (HA); A commercial HA XRD spectrum, B XRD spectrum of extracted HA, XRD spectra showed that most of the mineral content was HA, C SEM images of the HA particles. The particle size of the extracted powder was estimated to be 409.78 ± 89.58 nm