- Volume 16 Issue 12
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Protease Inhibitors in Porcine Colostrum: Potency Assessment and Initial Characterization
- Zhou, Q. (College of Animal Science, Huazhong Agriculture University) ;
- He, R.G. (College of Animal Science, Huazhong Agriculture University) ;
- Li, X. (College of Animal Science, Huazhong Agriculture University) ;
- Liao, S.R. (College of Animal Science, Huazhong Agriculture University)
- Received : 2003.03.14
- Accepted : 2003.08.11
- Published : 2003.12.01
Porcine colostrum and milk were separated into the acid-soluble and casein fractions by acidification followed by centrifuge. The acid-soluble fraction of porcine colostrum was further separated by liquid chromatography and anisotropic membrane filtration. Trypsin and chymotrypsin inhibitory capacity in porcine colostrum, milk and their components was determined by incubating bovine trypsin or chymotrypsin in a medium containing their corresponding substrates with or without addition of various amounts of porcine colostrum, porcine milk or their components. The inhibition of insulin-like growth factor I (IGF-I) and epidermal growth factor (EGF) degradation in pig small intestinal contents by porcine colostrum was measured by incubating iodinated IGF-I or EGF with the intestinal contents with or without addition of porcine colostrum. Degradation of labeled IGF-I or EGF was determined by monitoring the generation of radioactivity soluble in 30% trichloroacetic acid (TCA). The results showed that porcine colostrum had high levels of trypsin and chymotrypsin inhibitory activity and increased the stability of IGF-I and EGF in pig intestinal contents. The inhibitory activity declined rapidly during lactation. It was also found that trypsin and chymotrypsin inhibitory activity and the inhibition on IGF-I and EGF degradation in the acid-soluble fraction were higher than that in the casein fraction. Heat-resistance study indicated that trypsin inhibitors in porcine colostrum survived heat treatments of
Porcine Colostrum;Protease Inhibitors;Growth Factors;GI Tract
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