Physicochemical characterisation of calcium phosphates prepared from milk ultrafiltrates: Effect of the mineral composition

Abstract

This study deals with the precipitation of calcium phosphate in permeates removed from milks at different pH (6.7, 5.2 and 4.6). An overall high yield of precipitation of calcium and phosphate (70–80%, respectively) was obtained for all precipitates with Ca/P molar ratios close to 1.5. The suspended milk‐derived calcium phosphate (MDCP) precipitates had 8–14 μm size and −14 to −28 mV zeta potential. The dried MDCP precipitates were identified as amorphous calcium phosphate (ACP), stable over 18 months of storage at room temperature.

Size classification of precipitated calcium phosphate using hydrocyclone technology for the recovery of minerals from deproteinised acid whey

“…The molar ratio of calcium to phosphorus for OF2 was 1.9, close to the value for the liquid milk mineral concentrate generated from GAW (Table ) and identical to the value reported by Mekmene et al . () for calcium phosphate prepared from milk ultrafiltrate. The average particle size of the powder (OF2) was approximately 10 times smaller than that of the BF stream (Figure c).…”

“…Although the high levels of calcium and phosphate in acid whey can cause problems during processing, this also presents manufacturers with an opportunity to develop milk mineral ingredients for use in food applications (Anema 2009;Mekmene et al 2012). Precipitated calcium phosphate can be recovered by sedimentation.…”

Ion Exchange Chromatography With Conductivity Detection Compared to Spectrophotometry to Assay Phosphate in Milk and Milk Products

“…Since this mobile phas e contained alkaline NaOH, it was suspected that some precipitation of calcium phosphate occurred upon sample injection. It is well known that calcium phosphate is insoluble at alkaline pH (Mekmene et al, 2012). To check this hypothesis, a calcium phosphate precipitation test was performed where mineralized samples of milk, AMU and Raclette chees e were alkalinized to pH 12 using NaOH.…”

Impact of physicochemical changes in milk ultrafiltration permeate concentrated by reverse osmosis on calcium phosphate precipitation

“… 5 As MP contains a high concentration of Ca and P, exploring salts valorization is of significant interest. 6 These milk salts can be obtained from the lactose crystallization process after decanting the lactose slurry by centrifugation.…”