Table 2. Mathematical model equations to present the impacts of extraction temperature and time on extraction yield and gel strength of the gelatin extracted from Korean native black goat skin
Independent variable
Model equation
Lack of fit
r
2
p-value
Extraction yield
–22.89+0.990
X
1
+0.99
X
2
–0.00697
X
1
2
+0.036
X
2
2
–0.0116
X
1
X
2
0.629
0.95
<0.001
Gel strength
256.0–0.79
X
1
+35.1
X
2
+0.0055
X
1
2
–4.65
X
2
2
–0.159
X
1
X
2
0.139
0.83
0.013
X
1
, extraction temperature (°C);
X
2
, extraction time (h).