Determination of Rennet Clotting Time by Texture Analysis Method

Zerrin Yuksel

Department of Food Technology, Bayrami? Vocational Collage, ?anakkale Onsekiz Mart University, ?anakkale, Turkey.

DOI: 10.4236/fns.2013.411144                

Abstract

In this study, texture analysis method was used for the determination of rennet flocculation time (t_floc) and rennet clotting time (t_clot) of rennet-induced reconstitued milk samples with different CaCl₂ concentrations. The rennet flocculation time (RFT) and rennet clotting time (RCT) were also determined by using the Berridge test and sensory evaluation. The hardness value versus renneting time curves derived from texture analysis gave a good modified exponential relationship for each CaCl₂ concentration and the curves were used to calculate flocculation time and clotting time parameters. It was found that the parameters (t_floc and t_clot) appeared strongly correlated with RFT and RCT, respectively. Texture analysis was proved as a suitable method to control the rennet-induced coagulation and determine the rennet clotting time. It was also determined that enrichment of milk with CaCl₂ leaded to a decrease in flocculation and clotting times and an increase in rate of clotting and gel hardness.

Keywords

Rennet Flocculation Time; Rennet Clotting Time; Texture Analysis; Hardness; Rennet Gel; CaCl₂

Conflicts of Interest

The authors declare no conflicts of interest.

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