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 levels | Acid | Yield | Ferulic acid | Protein | Responses | X1 | X2 | X3 | Total CH | GalA | Rha | Ara | Glc | Gal |
| 1 | 1 | 90°C | 2 h | SA | 21.08 | 0.73 | 1.87 | 76.3 | 74.2 | 0.4 | 6.3 | 0.8 | 4.1 | CA | 18.25 | 0.86 | 1.69 | 79.6 | 66.5 | 0.4 | 4.8 | 0.4 | 1.9 | 17 | 1 | 100°C | 1.5 h | SA | 22.24 | 0.81 | 1.56 | 75.2 | 72.1 | 0.3 | 5.9 | 0.7 | 3.7 | CA | 17.52 | 0.74 | 1.96 | 77.3 | 67.1 | 0.3 | 4.2 | 0.3 | 1.7 | 12 | 3 | 80°C | 1.5 h | SA | 5.23 | 1.37 | 2.76 | 78.2 | 66.3 | 3.4 | 11.3 | 1.3 | 9.1 | CA | 6.79 | 1.26 | 3.09 | 80.1 | 62.6 | 3.1 | 9.6 | 0.8 | 6.8 | 15 | 3 | 90°C | 2 h | SA | 6.12 | 1.12 | 3.01 | 78.6 | 69.1 | 3.1 | 11.1 | 1.5 | 8.8 | CA | 8.81 | 1.42 | 2.63 | 79.5 | 63.7 | 2.7 | 9.1 | 0.6 | 6.5 |
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∗;The Std. and variables are corresponding to the Table 1. |