Parrotfish Scale Collagen Yield and Color Analysis

The yield of parrotfish scale collagens was stipulated according to the formula described by Matmaroh et al. [24 (link)] $\begin{array}{c}\mathrm{Y}\mathrm{i}\mathrm{e}\mathrm{l}\mathrm{d}\left(\%\right)=\frac{\mathrm{W}\mathrm{e}\mathrm{i}\mathrm{g}\mathrm{h}\mathrm{t}\mathrm{o}\mathrm{f}\mathrm{d}\mathrm{i}\mathrm{e}\mathrm{d}\mathrm{c}\mathrm{o}\mathrm{l}\mathrm{l}\mathrm{a}\mathrm{g}\mathrm{e}\mathrm{n}\left(ASC\wedge PSC\right)}{\mathrm{W}\mathrm{e}\mathrm{i}\mathrm{g}\mathrm{h}\mathrm{t}\mathrm{o}\mathrm{f}\mathrm{i}\mathrm{n}\mathrm{i}\mathrm{t}\mathrm{i}\mathrm{a}\mathrm{l}\mathrm{d}\mathrm{r}\mathrm{y}\mathrm{p}\mathrm{a}\mathrm{r}\mathrm{r}\mathrm{o}\mathrm{t}\mathrm{f}\mathrm{i}\mathrm{s}\mathrm{h}\mathrm{s}\mathrm{c}\mathrm{a}\mathrm{l}\mathrm{e}}\times 100\text{.}\end{array}$
Colour attributes for ASC-PFS and PSC-PFS were assessed through a colorimeter instrument (ColorFlex CX2379, HunterLab, Galveston, TX, USA), as described in a previous study [25 (link)]. The differences in the color test were presented in the CIELAB or CIE 1976 L^∗a^∗b^∗ colour space, where L^∗ is the lightness or brightness, a^∗ is the redness (from green to red), and b^∗ is the yellowness (from blue to yellow). For whiteness index (WI), both ASC and PSC from the parrotfish scales were determined using a formula stated by Ishamri et al. [27 (link)] $\begin{array}{c}WI={\left.{\left[\left(100-L^{\ast }\right.\right]}^2+\left({a^{\ast }}^2\right)+\left({b^{\ast }}^2\right)\right]}^{0.5}\text{.}\end{array}$