Effect of the Ratio of Raw Material Components on the Physico-chemical Characteristics of Emulsion-type Pork Sausages

Whey Protein-Tannic Acid Conjugate Stabilized Emulsion-Type Pork Sausages: A Focus on Lipid Oxidation and Physicochemical Features

The purpose of this study was to investigate the oxidative stability and physicochemical properties of pork emulsion sausages with whey protein-tannic acid conjugate and native whey protein. Over the course of 21 days, the thiobarbituric acid reactive substances (TBARS) of sausages containing a whey protein-tannic acid conjugate were lower than those of sausages with regular whey protein (p < 0.05). Kinetically, sausage containing the whey protein-tannic acid conjugate (k = 0.0242 day^-1) appeared to last longer than sausage containing regular whey protein (k = 0.0667 day^-1). The addition of the whey protein-tannic acid conjugate had no effect on product texture because there was no difference in hardness, springiness, cohesiveness, or water-holding capacity between the control and treated samples at Day 0 (p > 0.05). Scanning electron microscopy revealed that, at Day 21, the control sausage exhibited emulsion coalescence, as evidenced by an increase in the number of oil droplets and large voids, but not the whey protein-tannic acid conjugate-added sausage. There was no variation in the L*, a*, and b* values of the sausages when the whey protein-tannic acid conjugate was added (p > 0.05). However, there was a little increase in ΔE value in the treated sample. Thus, the whey-protein-tannic acid conjugate appeared to stabilize the lipid and physicochemical properties of the sausages by lowering the rate of TBARS production, retaining texture, water-holding capacity, and color, as well as by minimizing lipid coalescence during refrigerated storage.

Optimal raw material formulation to produce pressed pork ham at the least cost

This study optimized material use for making pressed pork hams (PPHs) using the least cost formulation program. Based on protein (P) content, different fat (2.5, 3.0, and 4.0P) and moisture (4.0P + 10, 4.0P + 15, 4.0P + 20, and 4.0P + 25) ratios were applied to make PPHs. Total expressible fluid, cooking loss, and purge loss were highest in PPHs formulated with 4.0P + 25 water (P < 0.05). With increasing fat ratio, lightness increased, but redness decreased (P < 0.05). Lipid oxidation was not affected by moisture ratio (P > 0.05). Hardness, gumminess, and adhesiveness decreased with increased fat and moisture (P < 0.05). PPH cost was reduced by fat and moisture. These results suggest that the formulations with 4.0P + 15 moisture, regardless of fat ratio, are recommended for PPHs due to their moderate cost and quality characteristics. In addition, greater cost savings can be expected by further subdividing raw material criteria for industrial applications.

Effect of storage time on the quality of chicken sausages produced with fat replacement by collagen gel extracted from chicken feet

The objective of this study was to evaluate the use of collagen gel extracted from chicken feet on chicken sausages during 42 d of refrigerated storage. Three chicken sausages were processed: standard (SS); replacing 50% fat with commercial collagen powder (SC); replacing 50% fat with chicken foot collagen gel (SG). Sausages were stored at 4°C and analyzed every 14 d, for proximate composition, fatty acid profile, thiobarbituric acid reactive substances (TBARS) number, antioxidant activity, electrophoresis, instrumental color, water holding capacity (WHC), texture profile analysis, and quantitative descriptive analysis. Sausages SC and SG had similar behavior to the standard in the sensorial parameters of appearance and color over 28 d of refrigerated storage. SG had the highest WHC (81.05%), the lowest TBARS value (0.38 mg MDA/kg), and the highest antioxidant activity in addition to having the best atherogenicity and thrombogenicity index compared with SC treatment, making collagen gel viable to replace fat and control the effects of lipid oxidation.