The oxidation of antioxidants in bottled extra virgin olive oil (EVOO), especially vitamin E and chlorophyll, can affect the quality of the product. However, the effect of light exposure on these functional compounds and their relation with oil quality, during the early storage of EVOO, is not clear. In this study, we evaluated the photochemical stability of vitamin E and chlorophyll in two monovarietal EVOO, Picual (PEVOO) and Farga (FEVOO), and in mixed olive oils (MOO) containing 70:30 v/v of EVOO and sunflower oil (SO), respectively. PEVOO, FEVOO, MOO and SO were subjected to light exposure for 7 days, and the amounts of vitamin E and chlorophyll were assessed by fluorescence spectra. Peroxide value (PV) and acidity index (AI) were also determined. Results showed that MOO contained significantly lower contents of vitamin E and chlorophyll than PEVOO or FEVOO before light exposure (p < 0.001). However, these compounds showed a significant decrease in PEVOO and FEVOO throughout light exposure (p < 0.001). Interestingly, although the effect of oil variety and light exposure on PV and AI determinations was significant (p < 0.001), all the oils showed values which were in accordance with the International Olive Council (IOC) standards. Principal component analysis (PCA) highlighted antioxidant changes in EVOO, MOO and SO upon this short period of light exposure. As a whole, our results indicate that, unlike PV and AI determinations, fluorescence spectra analysis may be an interesting tool for quality control in EVOO mixed with other oils or subjected to inadequate storage conditions.

瓶装特级初榨橄榄油（EVOO）中的抗氧化剂，尤其是维生素E和叶绿素的氧化会影响产品的质量。但是，在EVOO的早期存储过程中，曝光对这些功能化合物的影响及其与油质的关系尚不清楚。在这项研究中，我们评估了两种单品种EVOO，Picual（PEVOO）和Farga（FEVOO）以及含有EVOO和向日葵油的70:30 v / v的混合橄榄油（MOO）中维生素E和叶绿素的光化学稳定性。 SO）。对PEVOO，FEVOO，MOO和SO进行曝光7天，并通过荧光光谱评估维生素E和叶绿素的量。还测定了过氧化物值（PV）和酸度指数（AI）。p  <0.001）。但是，这些化合物在整个曝光过程中显示PEVOO和FEVOO显着降低（p  <0.001）。有趣的是，尽管不同种类的油和光照对PV和AI测定的影响是显着的（p  <0.001），但所有这些油的显示值均符合国际橄榄理事会（IOC）标准。主成分分析（PCA）强调了在短时间曝光后EVOO，MOO和SO中抗氧化剂的变化。总体而言，我们的结果表明，与PV和AI的测定不同，荧光光谱分析可能是用于与其他油类混合或在不足的储存条件下进行EVOO的质量控制的有趣工具。