ABSTRACT： Three trials were conducted to analyze a multi-enzyme compound produced by Aspergillus sulphureus in solid-state fermentation （SSF） as a po- tential feed additive. The results of the first trial showed that there were at least 5 non-starch polysac- charide enzymes： xylanase, 13-ghicanase, pectinase, mannase and carboxy methyl cellulase （CMCase） contained in the compound. Xylanase and fl-glucanase showed good activities at pH 2.5-7.0, which were in the range of 649-1046 U/g and 444-648 U/g, respec- tively. Pectinase showed good activity in acidic solu- tion （pH 2.5-3.0）,which ranged from 195 to 917 U/g. Mannase showed high activity of 235-298 U/g at pH 3.5-4.5 and the activity of CMCase was relatively constant at pH 2.5-7.0, which was in the range of 38.2-78.6 U/g. The second trial was aimed to test the stability of the enzymes in gastric liquor （pH 2.6） of finishing pigs and Na2 HPO4-gastric liquor （ pH 5.5 ）.After 6 h incubation at 40℃ in gastric liquor,the re- tained activity of xylanase, 13-glucanase, pectinase, mannase and CMCase was 26.3% ,65.0% ,71.0%, 74.8% and 85.6%, respectively. While after 6 h in- cubation at 40℃ in Na2I-IPO4-gastric liquor, the re- tained activity of xylanase, [3-glucanase, pectinase, mannase and CMCase was 87.9% ,91.1% ,92.3%, 95.0%, and 97.5%, respectively. The third trial was carried out in a jejunum liquor （ pH 5.8,200 mL）, which contained 0.2 g of the multi-enzyme compound and 10 g of soybean hull or wheat bran, respectively. After 8 h incubation at 40℃, 18.7% of soybean hull and 20.1% of wheat bran could be degraded to solu- ble saccharide, respectively. Compared with the tradi- tional methods for feed enzyme testing which involve feeding animals for 1-3 months, enzyme assay in this way was relatively convenient.
