Marination of Biceps femoris with hydrolyzed soy protein and its effect on beef quality and muscular structure

Author(s)

Alessandra Aparecida Silva

• Document type: Master's Dissertation
• Press: Piracicaba.
• Institution: Universidade de São Paulo (USP). Escola Superior de Agricultura Luiz de Queiroz (ESALA/BC)
• Defense date: 2009-10-01

Examining board members

Carmen Josefina Contreras Castillo; Eduardo Francisquine Delgado; Ana Lúcia da Silva Correa Lemos

• Advisor: Carmen Josefina Contreras Castillo

Abstract

Although meat industry uses marination in large-scale, the brine penetration behavior in tumbled steaks from bovines is little known. The Biceps femoris muscle has been considered little tender and juicy, and presented large range of intramuscular tenderness. Therefore, the objective of this work was to evaluate the effect of marination added of hydrolyzed soy protein on the muscular structure of different portions from the Biceps femoris and its implication on beef quality. In Chapter 2, 3 and 4, steaks from six bovine muscles were submitted to the treatments: CONTROL (no tumbling or addition of brine), WTB (with tumbling and addition of brine), and WTB/HSP (with tumbling and addition of brine plus hydrolyzed soy protein). In Chapter 2, the muscles were divided in two portions: Origin (OP) and Insertion (IP), and the tumbling times were 30 and 60 min. In Chapter 3 and 4, the muscles were divided in three portions: Origin (OP), Insertion 1 (IP1) and Insertion 2 (IP2), and their steaks were stored for 1 and 12 days after equalization of brine, except to the CONTROL steaks that were only stored for 1 day. The analyses performed were: monitoring of brine penetration, pH, yield (YIE), total collagen (TC), proximate composition, drip loss (DL), cooking loss (CL), shear force (SF), scanning electron microscopy (SEM), microbiologic and sensory. The experimental design was completely randomized blocks, where each muscle represented one block. The analysis of monitoring of the brine penetration showed that the WTB/HSP steaks, tumbled for largest time (60 min), had higher absorption and retention of brine along the depth of the steaks. The IP2 presented lower TC amount in relation to other portions, in CONTROL steaks. However, the WTB and WTB/HSP steaks from OP and IP1 had lower TC amount when compared to IP2, in these same treatments. The tumbled steaks were not affected by storing time and were tender, juicier and better scored for overall satisfaction with regard to CONTROL steaks. The pH of the steaks was elevated with the WTB and WTB/HSP treatments and appeared to influence the YIE of the portions, where OP had lower pH and higher YIE, while IP resulted in higher pH and lower YIE. Lower DL, CL and SF were observed for WTB and WTB/HSP steaks and the storing time of 12 days allowed that the CL and SF declined. Similar responses between sensory tenderness and SF were observed in the muscle portions, which IPs were tender than OP. The SEM analysis showed swelling of fibers and decrease of spaces between fibrils in tumbled WTB and WTB/HSP steaks (AU)