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- Title
Application of vacuum impregnation with anti-freezing proteins to improve the quality of truffles.
- Authors
Derossi, A.; Iliceto, A.; Pilli, T.; Severini, C.
- Abstract
Vacuum impregnation (VI) with anti-freezing proteins was studied with the aim to minimize the loss in consistency occurring on truffles after thawing. Particularly, vacuum level, vacuum time and the relaxation time were modulated by using a Box-Behnken design. The results showed a significant weight increase of truffle samples in the range between 0.02 and 0.29 g/g proving that the impregnation occurred in all experimental conditions although the truffles showed a low porosity fraction (~6.33 %). After thawing, the samples submitted to pressure values lower than 150 mbar and vacuum times greater than 6.5 min, showed a consistency similar to the fresh samples, stating that the application of VI with a solution of anti-freezing proteins can be a useful method to reduce the loss in consistency probably caused by ice crystal formation. Moreover, after VI the samples showed an increase of porosity fraction probably due to the formation of new fractures as a consequence of the high rigidity of truffles. This phenomenon probably increased the absorption of anti-freezing proteins as a consequence of the improvement of solid-liquid surface contact area.
- Publication
Journal of Food Science & Technology, 2015, Vol 52, Issue 11, p7200
- ISSN
0022-1155
- Publication type
Article
- DOI
10.1007/s13197-015-1843-y