Turbidimetric analysis upon acidification was achieved via an in situ acidifier e GDL. GDL powder was used to be a self-adjusted acidifier. The gelatin/gum arabic mixture was prepared at a total biopolymer concentration of 0.5% (w/v). The process was initiated by adding GDL powder (0.2%, w/v) to the pre-prepared mixture. Then, the sample was stirred for 1 min to allow a homogeneous dissolution of the GDL. Subsequently, one sample was used for measurement of turbidity at 600 nm (UV-1600, Shanghai Mapada Instrument Company, China); the other same sample was used for pH measurement. For the same sample, both pH and corresponding turbidities were recorded, simultaneously. The sample without addition of GDL was used as blank. The biopolymer dispersions with gelatin/gum arabic mixing ratios of 2:1, 1:1 and 1:2 were applied to this method. All measurements were made in more than triplicate for accuracy consideration.