Table 3.

Characteristic peaks of X-ray diffraction of α-, β-, and γ-chitin reported by some authors.

Author	Type of chitin	Characteristic peaks 2θ	Source
Jang et al. [18]	α-chitin	9.6°, 19.6°, 21.1°, and 23.7°	Crab shell
	β-chitin	9.1° and 20.3°	Squid pen
	γ-chitin	9.6° and 19.8°	Lucainade
Cárdenas et al. [19]	α-chitin	19.18° and 19.26°	Shrimp, prawn, king crabs, and lobster
	β-chitin	18.78°	Squid
Kim et al. [20]	β-chitin	9.8° and 19.3°	Squid
Yen and Mau [21]		9.3° and 19°	Crabs
Yen and Mau [6]		5.4°–5.6°, 9.1°, and 19.3°–19.6°	Lentinula edodes