Effect of hydrocolloids on pulp sediment, white sediment, turbidity and viscosity of reconstituted carrot juice

The effect of hydrocolloids such as guar (GU), xanthan (XA), sodium carboxymethylcellulose (CMC), gellan (GE) and a mixture of GE and XA (GX) on pulp sediment (PS), white sediment (WS), turbidity and viscosity of reconstituted carrot juice (RCJ) is investigated in this paper. The respective addition of 0.200 g/100 ml GU, 0.200 g/100 ml XA, 0.300 g/100 ml CMC and a mixture of 0.015 g GE + 0.100 g XA/100 ml into RCJ could decrease the amount of PS and WS, but could not prevent the occurrence of PS and WS after 60 d storage. However, PS and WS were not observed due to a smaller quantity in GE (0.020) sample, indicating that 0.020 g/100 ml GE could prevent the occurrence of PS and WS effectively. The prevention of PS and WS in GE (0.020) sample may be caused by a combined effect of the electrostatic repulsion between the GE molecules, viscosity and networks of GE. GE with a concentration of 0.020 g/100 ml had a least effect on the turbidity and viscosity of RCJ as compared to other hydrocolloids. Thus, GE was more suitable as a stabilizer in the application of RCJ.