Ontology type: schema:ScholarlyArticle
2013-03
AUTHORSPamela Manzi, Laura Pizzoferrato
ABSTRACTLactulose (4-O-β-d-galactopyranosyl-d-fructose), formed from lactose (4-O-β-d-galactopyranosyl-d-glucose) by the Lobry de Bruyn–Alberda van Ekenstein rearrangement during severe heat treatments, is considered a useful indicator of heat-induced modifications in milk. Its chromatographic determination in milk is particularly troublesome due to the concomitant presence of a lactose amount two orders of magnitude larger than the lactulose amount and to a similar retention time of the two compounds. In this work, four HPLC methods have been compared with the aim to develop a more accurate analytical procedure to determine lactulose in milk, together with lactose. The developed method is based on a Carrez precipitation followed by a HPLC separation on two in-series amino-based columns, using CH3CN:H2O 75:25 (v:v) as the mobile phase at 1 ml/min flow rate and a refractive index as the detector. The linearity test for the quantitation of lactulose has been carried out over the range 0.060–1.006 mg/ml, the limit of detection, is 0.013 mg/ml (256 ng injected) and the limit of quantitation is 0.028 mg/ml (556 ng injected). The proposed method, simple, cheap and time-saving, allows an accurate lactulose–lactose separation, with conventional HPLC equipment. More... »
PAGES851-857
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