Abstract

Reconstituted milk replaced fresh milk has been applied in the production of yoghurt. The flavor compounds and texture profile analysis of yoghurt produced from reconstituted milk were investigated. Using SPME-GC-MS, 24 and 22 volatiles were found in reconstituted whole milk and reconstituted skim milk, while 32 and 28 volatiles were found in their yoghurt products, respectively. Levels of aldehydes, methyl ketones, alkanes olefinic aldehydes, ketenes in liquid milk and yoghurt increased with increasing the intensity of heat treatments. Two-Pentanone, 2, 3-butanedione, 2, 3-pentanedione, 3-hydroxy-2-butanone, ethyl butyrate and 2-octanone that were metabolized by starter culture organisms showed an opposite tendency. Principle component analysis for flavor impact compounds indicated that the main difference occurred among the treatments. On the other hand, firmness, adhesiveness, chewiness and viscosity of yoghurt increased with increasing the heat intensity, while springiness, cohesiveness and resilience decreased. There was a significant difference in the textural property between the reconstituted whole milk and reconstituted skim milk (p<0.05).

Keywords:

Preheat, reconstituted milk, texture, volatiles, yoghurt,

References

1. Alloggio, V., F. Caponio, A. Pasqualone and T. Gomes, 2000. Effect of heat treatment on the rennet clotting time of goat and cow milk. Food Chem., 70: 51-55.
   CrossRef    
2. Calvo, M.M. and L. De La Hoz, 1992. Flavour of heated milks: A review. Int. Dairy J., 2(2): 69-81.
   CrossRef    
3. Contarini, G. and M. Povolo, 2002. Volatile fraction of milk: Comparison between purge and trap and solid phase microextraction techniques. J. Agr. Food Chem., 50(25): 7350-7355.
   CrossRef    PMid:12452657    
4. Contarini, G., M. Povolo, R. Leardi and P.M. Toppino, 1997. Influence of heat treatment on the volatile compounds of milk. J. Agr. Food Chem., 45(8): 3171-3177.
   CrossRef    
5. Drake, M.A., 2007. Invited review: Sensory analysis of dairy foods. J. Dairy Sci., 90: 4925-4937.
   CrossRef    PMid:17954731    
6. Garde, S., M. Avila, M. Medina and M. Nunez, 2005. Influence of a bacteriocin-producing lactic culture on the volatile compounds, odour and aroma of Hispanico cheese. Int. Dairy J., 15(10): 1034-1043.
   CrossRef    
7. Hettinga, A.K., H.J.F. van Valenberg and A.C.M. van Hooijdonk, 2008. Quality control of raw cows' milk by headspace analysis. Int. Dairy J., 18(5): 506-513.
   CrossRef    
8. Labropoulos, A.E., J.K. Palmer and P. Tao, 1982. Flavor evaluation and characterization of yogurt as affected by ultra-high temperature and vat processes. J. Dairy Sci., 65(2): 191-196.
   CrossRef    
9. Li, Y.H., L.W. Zhang, W.J. Wang and X. Han, 2013. Differences in particle characteristics and oxidized flavor as affected by heat-related processes of milk powder. J. Dairy Sci., 96(8): 4784-4793.
   CrossRef    PMid:23769359    
10. Lucey, J.A. and H. Singh, 1997. Formation and physical properties of acid milk gels: A review. Food Res. Int., 30: 529-542.
    CrossRef    
11. Lund, B.M., G.W. Gould and A.M. Rampling, 2002. Pasteurization of milk and the heat resistance of Mycobacterium avium subsp. paratuberculosis: A critical review of the data. Int. J. Food Microbiol., 77: 135-145.
    CrossRef    
12. Marshall, V.M. and H.L. Rawson, 1999. Effects of exopolysaccharide-producing strains of thermophilic lactic acid bacteria on the texture of stirred yoghurt. Int. J. Food Sci. Tech., 34(2): 137-143.
    CrossRef    
13. Mottar, J., A. Bassier, M. Joniau and J. Baert, 1989. Effect of heat-induced association of whey proteins and casein micelles on yogurt texture. J. Dairy Sci., 72: 2247-2256.
    CrossRef    
14. Nursten, H.E, 1997. The flavour of milk and dairy products: I. Milk of different kinds, milk powder, butter and cream. Int. J. Dairy Technol., 50(2): 48-56.
    CrossRef    
15. Ott, A., L.B. Fay and A. Chaintreau, 1997. Determination and origin of the aroma impact compounds of yogurt flavor. J. Agr. Food Chem., 45(3): 850-858.
    CrossRef    
16. Ott, A., J. Germond, M. Baumgartner and A. Chaintreau, 1999. Aroma comparisons of traditional and mild yogurts: Headspace gas chromatography quantification of volatiles and origin of alpha-diketones. J. Agr. Food Chem., 47(6): 2379-2385.
    CrossRef    PMid:10794640    
17. Shiratsuchi, H., M. Shimoda, K. Imayoshi, K. Noda and Y. Osajimat, 1994. Volatile flavor compounds in spray-dried skim milk powder. J. Agr. Food Chem., 42(4): 984-988.
    CrossRef    
18. Soukoulis, C., P. Panagiotidis, R. Koureli and C. Tzia, 2007. Industrial yogurt manufacture: Monitoring of fermentation process and improvement of final product quality. J. Dairy Sci., 90(6): 2641-2654.
    CrossRef    PMid:17517704    
19. Vasbinder, A.J., A.C. Alting, R.W. Visschers and C.G. De Kruif, 2003. Texture of acid milk gels: Formation of disulfide cross-links during acidification. Int. Dairy J., 13: 29-38.
    CrossRef    
20. Wang, W.J., L.W. Zhang, Y.H. Li and Z. Feng, 2012. Heat-induced protein aggregates and difference in the textural properties of whole milk gel. J. Food Quality, 35(4): 247-254.
    CrossRef    
21. Wilkins, D.W., R.H. Schmidt and L.B Kennedy, 1986. Threonine aldolase activity in yogurt bacteria as determined by headspace gas chromatography. J. Agr. Food Chem., 34: 150-152.
    CrossRef    

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