Research Article

Comparative Studies of Combined Influence of Variables on the Esterification Degree of Pectin Extracted by Sulfuric Acid and Citric Acid

Table 4

Yield and chemical composition of pectins extracted by SA and CA from sugar beet pulp (%).

Std.Variable levelsAcidYieldFerulic acidProteinResponses
X1X2X3Total CHGalARhaAraGlcGal

1190°C2 hSA21.080.731.8776.374.20.46.30.84.1
CA18.250.861.6979.666.50.44.80.41.9
171100°C1.5 hSA22.240.811.5675.272.10.35.90.73.7
CA17.520.741.9677.367.10.34.20.31.7
12380°C1.5 hSA5.231.372.7678.266.33.411.31.39.1
CA6.791.263.0980.162.63.19.60.86.8
15390°C2 hSA6.121.123.0178.669.13.111.11.58.8
CA8.811.422.6379.563.72.79.10.66.5

∗;The Std. and variables are corresponding to the Table 1.