3.2.2. Effect of pH
In general, the pH of fruit juices varies from acidic to slightly basic in some nutritional beverages. The pH could conceivably affect the extraction of b-carotene. Thus, a blank solution was adjusted with appropriate buffer solutions (pH 1–14) and preliminarily processed by the AA-LDS-LLME-SFOD method. As can be observed in Fig. 3c, the pH of the sample solution had no effect
on b-carotene extraction under the AA-LDS-LLME-SFOD procedure.
Based on these results, pH adjustment was not performed in subsequent experiments.