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Article Abstract
The European reference method (ERM) recognises the fraudulent addition of bovine (B) milk in water buffalo (WB) milk/dairy products based on concomitant isoelectric focusing (IEF) detection of B γ- and γ-CN fragments after corresponding plasminolysis. We here used proteomics to characterise false positive results occurring in the ERM as being due to WB β-CN(f100-209), which is also formed after plasminolysis of genuine WB milk/dairy products and comigrates in IEF with B γ-CN. These ERM limitations were overcome by a dedicated proteomic procedure based on loading of B/WB milk/cheese CN extracts on a hydroxyapatite column, in situ trypsinolysis and elution of B β-CN(f1-25)4P and WB β-CN(f1-28)4P proteotypic peptides. Based on their similar ionisation properties and resolution in MALDI-TOF-MS, these phosphopeptides were identified as suitable markers for detection of B material in WB milk/dairy products to a detection limit of 0.8% v/v. This proteomic procedure is here proposed as integrative/alternative to the ERM.
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| http://dx.doi.org/10.1016/j.foodchem.2017.03.055 | DOI Listing |
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