Acta Univ. Agric. Silvic. Mendelianae Brun. 2012, 60(6), 189-196 | DOI: 10.11118/actaun201260060189

Changes of quality of rennets during storing

Monika Kozelková, Miroslav Jůzl, Táňa Lužová, Květoslava Šustová, Aneta Bubeníčková
Ústav technologie potravin, Mendelova univerzita v Brně, Zemědělská 1, 613 00 Brno, Česká republika

This work deals about evaluation of qualitative parameters of rennets. During the six months storing of rennets were determined following qualitative parameters: pH, rennet coagulation time, activity (strange) of rennet and dose of rennet, and finally were used instrumental methods: Near infrared spectroscopy (NIR) for recognizing age of rennets and spectrophotometric methods of determining the color of rennets. The theory found in the references suggests, that the activity of rennet should decrease by an average of 1-2 % per month, but the results are showing, that are changing quality of rennets namely mostly activity (strange) of rennet, which was decreased by 33% per half year. In analysis of color of rennets weren't observed major changes by the whole group. Some statistical differences were detected in the partial values L*a*b*, most advantageous were evaluation by rennet total color change during storage, which were higher than noticeable change in four samples. The least color changes (P > 0.05) were observed in microbial rennets, with no values observed (ΔEab < 2) that can be recognized even by the human eye when subjected to parallel comparison. It was found that the NIR analysis can be used to recognizing of rennets, which are different ages.

Keywords: rennet, qualitative parameters, NIR spectroscopy, color
Grants and funding:

This research has been supported by the project IGA MENDELU IP 12/2011.

Received: June 25, 2012; Prepublished online: July 19, 2013; Published: July 20, 2013  Show citation

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Kozelková, M., Jůzl, M., Lužová, T., Šustová, K., & Bubeníčková, A. (2012). Changes of quality of rennets during storing. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 60(6), 189-196. doi: 10.11118/actaun201260060189
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