Journal of agricultural and food chemistry | 2019
Analysis of microsatellites (SSRs) in processed olives as a means of cultivar traceability and authentication.
Abstract
Select cultivars of table olives have more desirable traits and a higher economic value. There are suspected issues with cultivar mislabeling and traceability in the supply chain. Here we describe a method to identify cultivars by genotyping of processed olives. DNA was extracted from leaves and California-style olives of 7 commonly-packed cultivars. Processed olive fruits yielded relatively low DNA concentrations (0.04 µg/g - 0.86 µg/g), and extracts had more impurities compared with leaves. From 15 candidate SSRs, five markers showing the highest number of unique allele combinations and discriminatory power were selected. These SSRs were successfully amplified and analyzed in all cultivars of olives except one. When directly comparing any two cultivars, different allele combinations were typically present for at least 4 of the 5 SSRs. Microsatellite analysis shows potential as a simple yet robust diagnostic tool. The method can be expanded to include other cultivars, styles of table olives, and potentially other processed plant-based foods.