International Journal of Engineering and Technology

The objective of this research was to determinate the quality in orange juices marketed in the city of Cartagena de Indias, Colombia. Analyses of Total Soluble solids (TSS), pH and titulable acidity (TA) were performed, and the amino acid content was also determined in three commercial juices, three artisanal juices and one orange juice as a control sample. pH values were lower in juices with higher acidity. For individual amino acids, the most prevalent were arginine, serine and proline in the range of (2.87-7.23 g kg^-1), (4.89 g kg^-1) and (3.82-7.43 g kg^-1), respectively.