Sodium chloride (NaCl) replacement with calcium chloride (CaCl
2
)
effect on protein solubility, proteolytic enzyme and quality characteristics of
a chicken soup prepared from spent hen (SH) chicken were investigated. By means
of immerse marination prior to cooking, a total of 60 skinless SH breast meat
were randomly allocated into ten groups admitted to treatments with marinade
solution containing sodium tripolyphosphate (STPP) and reduced percentage of
NaCl with CaCl
2
at 0%, 25%, 50%, 75%, and
100% at 4±2°C for 20 h. STPP was adjusted to 0.5%
for all treatments and NaCl replacement at 0% was used as control. The
different methods, particularly boiling at 100°C and retorting at
121°C, 1.5 kgf/cm
2
for 60 minutes, were applied following
marination. An upregulation of cathepsin-B and caspase-3 enzymes were a
consequences from a higher percentage of CaCl
2
within meat
environment. Accordingly, modified the protein solubility in particular the
myofibrillar and total protein solubility. In addition, a significant increase
in water holding capacity (WHC), pH value, myofibril fragmentation index (MFI),
and moisture content was obtained due to salt replacement (p<0.05).
Limited effect was observed for shear force value, collagen content and cooking
yield. Eventually, this study implied that although protelytic enzyme and
protein solubility was upregulated by the replacement of NaCl with
CaCl
2
at >75%, extensive effect on texture
properties was not observed. Therefore, NaCl replacement at 75% could be
a promising strategy for quality improvement of SH chicken soup.