The control of gastric pepsin secretion continues to excite controversy. The diversity in the results obtained by different investigators may be due, at least in part, to the varying techniques employed to estimate pepsin activity. Thus, edestin (Polland and Bloomfield, 1929), gelatin (Gilman and Cowgill, 1930), egg albumen (Vineberg and Babkin, 1931), beef haemoglobin (Anson and Mirsky, 1932),...

Background: The African ostrich is the largest herbivorous bird in world, which has high economic value. However, brooding period of long. During this period, various organs body are not fully developed, resistance low and it easy to get sick, thus affecting growth development. Therefore, great significance enhance digestion absorption capacity chicks improve its speed shortening incubation ost...

In vitro techniques were evaluated to determine the nutritive value of a selection of tanniniferous tree and shrub legumes (Calliandra calothyrsus, Leucaena leucocephala L. diversifolia and L. pallida) compared with lucerne (Medicago sativa). Polyethylene glycol (PEG) was also added to some in vitro fermentations (10 mg PEG/50 mg plant substrate) to assess the effects of tannins on digestion of...

It is generally believed that the proteolytic action of papain differs from that of enzymes of animal origin such as pepsin and trypsin. Annetts (1) found that when egg albumin is treated with papain-cyanide at pH 5 the course of digestion is marked not only by a progressive increase in material of low molecular weight but also by changes in the remaining albumin molecules. From ultracentrifuga...

A study of the inactivation of trypsin and chymotrypsin by high pressures was reported previously (1). The effects of high pressure on pepsin and chymotrypsinogen, and on the activation of chymotrypsinogen by trypsin, have now been examined. The effect of high pressure on crystalline pepsin was investigated by Matthews, Dow, and Anderson (2), in particular as affected by magnitude of pressure a...

Whey proteins have well-established antioxidant and anti-inflammatory bioactivities. High hydrostatic pressure processing of whey protein isolates increases their in vitro digestibility resulting in enhanced antioxidant and anti-inflammatory effects. This study compared the effects of different digestion protocols on the digestibility of pressurized (pWPI) and native (nWPI) whey protein isolate...

An in vitro method for estimating food iron availability is described. The method involves simulated gastrointestinal digestion followed by measurement of soluble, low molecular weight iron. Mixtures of foods (meals) were homogenized and exposed to pepsin at pH 2. Dialysis was used to adjust the pH to intestinal levels and digestion was continued after the addition of pancreatin and bile salts....