It has been carried out a study relating the contained in Prolina of Sardinian wines. By the results obtain it has been possible to record that the 5% of samples has a contained in Prolina below 100 mg/1, 29% between 100 and 300 mg/1, an other 29% between 300 and 500 mg/1, the 30% between 500 and 800 mg/1 and 7% has a contained in Prolina superior 800 mg/1.