. 2023 Jan 20;9(2):e13093. doi: 10.1016/j.heliyon.2023.e13093

Table 3.

Crystallinity of calcium carbonate in pasteurized and sterilized eggshell powder after further heat treatment.

Initial treatment of eggshell sample	Additional treatment conditions	Time (min)	Crystallinity after all treatments (%)
Pasteurized at 95 °C for 60 min	No further heating (control)	–	90.95 ± 0.35^ab
	Hot air drying at 200 °C	20	90.50 ± 0.00^ab
	Infrared drying at 1050 W	20	90.65 ± 0.07^ab
	Microwave at 900 W	2	91.05 ± 0.21^a
Sterilized at 121 °C for 15 min	No further heating (Control)	–	90.70 ± 0.57^ab
	Hot air drying at 200 °C	20	90.65 ± 0.35^ab
	Infrared drying at 1050 W	20	90.80 ± 0.42^ab
	Microwave at 900 W	2	90.20 ± 0.14^b

^a–b Values (mean ± standard deviation) with different lowercase letters are significantly (P ≤ 0.05) different).