Addition of pectin and whey protein concentrate minimises the generation of acid whey in Greek-style yogurt

The objective of the study reported in this Research Communication was to investigate the effects of pectin and whey protein concentrate (WPC) on the generation of acid whey during Greek-style yogurt (GSY) processing. Yogurt samples were prepared using pectin (0·05%, w/v) and whey protein concentrate (WPC-80) (1%, w/v) as possible ingredients that reduce the acid whey production. Control yogurt sample was prepared without addition of these ingredients. The results showed that yogurt made with pectin plus WPC had significantly higher water holding capacity (~56%) than the control (33%). Similarly, yogurt supplemented with pectin plus WPC exhibited 15% less susceptibility to syneresis compared to the control (P < 0·05). Viability of L. bulgaricus and S. thermophilus in all yogurts remained ≥7·0 and ≥8·0 log CFU/g respectively. Native PAGE analysis showed an interaction between pectin and WPC. Pectin hinders the formation of large oligomeric aggregates of whey protein which correlates with an increase in WHC and a decrease in syneresis. Our results demonstrated that a combination of pectin and WPC have the potential to limit the quantity of acid whey generation in GSY manufacturing. Thus, these ingredients have positive implications for dairy industry in the production of GSY.

[1]  R. Gyawali,et al.  Effects of hydrocolloids and processing conditions on acid whey production with reference to Greek yogurt , 2016 .

[2]  G. Smithers.  Whey-ing up the options – Yesterday, today and tomorrow , 2015 .

[3]  M. Guo,et al.  Physicochemical Properties , Microstructure and Probiotic Survivability of NonFat Goat ' s Milk Yogurt Using Heat Treated Whey Protein Concentrate as a Fat Replacer , 2016 .

[4]  C. Moraru,et al.  Use of micellar casein concentrate for Greek-style yogurt manufacturing: effects on processing and product properties. , 2014, Journal of dairy science.

[5]  U. Farooq,et al.  Stabilizers: Indispensable Substances in Dairy Products of High Rheology , 2014, Critical reviews in food science and nutrition.

[6]  A. Novakovic,et al.  Industry Evaluations of the Status and Prospects for the Burgeoning New York Greek-style Yogurt Industry , 2014 .

[7]  M. Drake,et al.  Sensory properties and drivers of liking for Greek yogurts. , 2013, Journal of dairy science.

[8]  Suvendu Bhattacharya,et al.  Hydrocolloids as thickening and gelling agents in food: a critical review , 2010, Journal of food science and technology.

[9]  C. Soukoulis,et al.  Industrial yogurt manufacture: monitoring of fermentation process and improvement of final product quality. , 2007, Journal of dairy science.

[10]  J. Tissier,et al.  Preliminary observations on the effects of milk fortification and heating on microstructure and physical properties of stirred yogurt , 2003 .

[11]  M. Augustin,et al.  Structure and visco-elastic properties of set yoghurt with altered casein to whey protein ratios , 2002 .

[12]  L. Amigo,et al.  Influence of skimmed milk concentrate replacement by dry dairy products in a low fat set‐type yoghurt model system. I: Use of whey protein concentrates, milk protein concentrates and skimmed milk powder , 1999 .

[13]  J. Hourigan,et al.  Effect of partially replacing skim milk powder with whey protein concentrate on buffering capacity of yoghurt , 1996 .

[14]  H. Morris,et al.  TEXTURAL AND MICROSTRUCTURAL PROPERTIES OF RENNET‐INDUCED MILK COAGULUM AS AFFECTED BY THE ADDITION OF SOY PROTEIN ISOLATE , 1987 .