Effects of sodium chloride, phosphate type and concentration, and pump rate on beef biceps femoris quality and sensory characteristics
Introduction
The beef industry has experienced an increased necessity to boost the demand for cuts from the chuck and round. The chuck and round comprise approximately two-thirds of carcass weight, yet only yield 50% of carcass value (NCBA, 2000). Additionally, many of the cuts originating from the chuck and round have traditionally been fabricated and marketed as roasts, yet typically due to the demand of cooking-time associated with roast cookery, this method of consumer preparation has declined (NCBA, 2000). The biceps femoris muscle, often fabricated as a roast and originating from the outside round has been reported to exhibit higher Warner–Bratzler shear force values and decreased sensory tenderness ratings (Brooks et al., 2000, Rhee et al., 2004). Furthermore, Nelson, Dolezal, Ray, and Morgan (2004) reported decreased sensory juiciness and overall tenderness ratings for biceps femoris steaks, compared to either longissimus or triceps brachii steaks. Elam, Brooks, Morgan, and Ray (2002) applied mechanical tenderization and marination in a solution containing water, salt, and a tenderizer to biceps femoris muscles, and the authors reported improved sensory tenderness ratings for the treated steaks compared to untreated steaks; however, there were no improvements in sensory juiciness with the enhancement treatment.
Several studies have investigated water retention and binding characteristics of different phosphate types and concentrations in poultry, and ground and restructured beef products (Shults et al., 1972, Shults and Wierbicki, 1973, Trout and Schmidt, 1984). Furthermore, investigations into the performance of different phosphates on poultry sensory characteristics (Xiong & Kupski, 1999), and enhancement solutions with a phosphate component on whole-muscle beef quality (Lawrence et al., 2003, Vote et al., 2000) have been conducted. However, an investigation of the effects of phosphate types with differing concentrations and pump rates in lesser value whole-muscle beef cuts has not been performed. Therefore, the objectives of this study were to investigate the performance and possible interactive effects of three different phosphate types, two phosphate concentrations, and two injection rates on quality and sensory characteristics of whole-muscle beef biceps femoris muscles.
Section snippets
Muscles
Fresh beef bottom round subprimals (6 d postmortem; IMPS 171b; n = 45) from USDA Select carcasses were obtained from a commercial packing plant and transported to the University of Arkansas Red Meat Abattoir and stored at 2 °C for 24 h. Subsequently, muscle sections were removed from vacuum-sealed bags and all external fat and adjacent muscles were removed from the biceps femoris muscle.
Enhancement treatments
Utilizing a randomized 3-way factorial design, the 45 muscles were randomly assigned to one of 15 treatments (
pH, water-holding capacity, water-binding ability, and percent moisture
Results pertaining to post-injection pH, water-holding capacity, water-binding ability, and percent moisture are reported in Table 2, Table 3. The pH of SHMP-enhanced muscle samples was lower (P < 0.05) than CNT; however, STPP and TSPP treatments did not differ from CNT (Table 2). Additionally, STPP and TSPP both had a higher (P < 0.05) pH than NaCl, whereas the pH of SHMP did not differ (P > 0.05) from NaCl. In relation to the factorial analysis (Table 3), SHMP had a lower (P < 0.05) pH than both STPP
Summary
Since interactive effects were insignificant, the phosphate types used in this study appear to exhibit relative performance regardless of the concentrations used in whole-muscle beef. Sodium tripolyphosphate (STPP) and TSPP performed better than SHMP in terms of water retention, water binding, and cook yield in beef biceps femoris muscles. Although there were no differences between phosphate concentrations for water-holding capacity or cook yield, increased phosphate concentrations did allow
Acknowledgments
Appreciation is expressed to the Arkansas Beef Council for funding this research. The support of Tyson Foods, Inc., Springdale, AR and Astaris, LLC, St. Louis MO, during these trials is also appreciated. Additionally, the authors would like to express their gratitude to P. Dias-Morse, W. Schuhknecht, C. Rogers, L. Rakes, and J. Stephenson for their assistance during these trials.
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