Processing of Food Commodities

Standard meat curing formulations consist of sodium chloride ($NaCl$, for moisture extraction and microbial inhibition), sodium nitrite ($NaNO_2$, for cured pink color formation and Clostridium botulinum inhibition), and sodium nitrate ($NaNO_3$, slow reservoir for nitrite). Sodium sulphate ($Na_2SO_4$) plays no role in curing and is not an authorized curing salt.

Option analysis:

• Sodium nitrate: Standard curing salt converted to nitrite by bacterial reduction.
• Sodium sulphate: Correct, not a meat curing agent.
• Sodium nitrite: Primary curing salt forming nitrosylmyoglobin.
• Sodium chloride: Fundamental base salt in all curing mixtures.

In wholesale beef carcass fabrication, the forequarter comprises five primal cuts: Chuck, Rib, Brisket, Shank, and Plate (short plate). The hindquarter consists of the Short loin, Tenderloin, Sirloin, Flank, and Round. Therefore, Plate is a forequarter cut.

Option analysis:

• Plate: Correct, primal cut located on the belly of the forequarter below the rib.
• Short loin: Primal cut from the hindquarter.
• Tender loin: Subprimal cut from the lumbar region of the hindquarter.
• Flank: Primal cut from the abdominal area of the hindquarter.

Post-mortem meat tenderization is driven by two major endogenous enzymatic systems: the cytosolic calpain system and the lysosomal cathepsin system. The Calpains (Calcium-Activated Neutral Proteinases, CANP, including $\mu$-calpain and m-calpain) are non-lysosomal, neutral intracellular cysteine proteases located in the sarcoplasm that specifically degrade titin, nebulin, and desmin, driving post-mortem aging and tenderization. Cathepsins (B, D, H, L) are lysosomal acid proteases.

Option analysis:

• Calcium activated neutral proteinases: Correct, non-lysosomal calpains responsible for myofibrillar breakdown during aging.
• Cathepsin-B: Lysosomal protease.
• Acid phosphatase: Lysosomal marker enzyme, not a tenderizing protease.
• Cathepsin-D: Lysosomal aspartic protease.