# Antioxidative and Photop Protective In Vitro Potential of Lavandula Angustifolium
## 3 Results
The lowest values of this parameter were found for undiluted alcohols. Significant differences were found between herb and flower extracts assayed both immediately after preparation (\(p\) = 0.0028) and after twelve months (\(p\) = 0.0038) (Table 2). Figure 4: Mean antioxidant potential of _Lavandula angustifolia_ flower alcoholic extracts (in mg Trolox/g raw material (TEAC)) evaluated immediately and twelve months after preparation using the ABTS method. Vertical lines correspond to standard deviations (SD). No statistically significant differences were found between flower extracts assayed immediately and after twelve months. Figure 5: In vitro sun protection factor of _Lavandula angustifolia_ herb alcoholic extracts evaluated immediately and twelve months after preparation. No statistically significant differences were found between herb extracts assayed immediately and after twelve months. In Figure 7, correlations between the evaluated antioxidant activity of _Lavandula angustifolia_ extracts determined using DPPH and ABTS methods after the preparation of extracts and twelve months later are presented. Statistically significant correlations were found for the activity of both herb and flower extracts determined either by DPPH or ABTS methods. A significant linear relationship between the antioxidant activity of _Lavandula angustifolia_ alcoholic extracts of herbs and flowers was observed both after the application of the DPPH and ABTS methods (\(p<0.001\))  
Figure 6: In vitro sun protection factor of _Lavandula angustifolia_ herb alcoholic extracts evaluated immediately and twelve months after preparation. No statistically significant differences were found between flower extracts assayed immediately and after twelve months. Figure 7: Correlation between the evaluated antioxidant activity of _Lavandula angustifolia_ alcoholic extracts determined using DPPH and ABTS methods after preparation of extracts and twelve months later r—correlation coefficient, \(p\)—probability. Figure 8 presents correlations between the in vitro SPF value of the studied extracts determined after the preparation of _Lavandula angustifolia_ alcoholic extracts and twelve months later. A highly significant linear relationship between the SPF value of _Lavandula angustifolia_ alcoholic extracts of herb and flower was observed (correlation coefficient r = 0.9526 and r = 0.8989, respectively, \(p\) < 0.0001). Figure 9 presents the correlation between the in vitro SPF values and antioxidant activity determined using the DPPH and ABTS methods. A significant linear relationship was found between antioxidant activity determined with the ABTS method both for herb and flower extracts, whereas this was found only for the herb extracts for the DPPH method. Figure 8: Correlations between the in vitro SPF values of the _Lavandula angustifolia_ herb and flower extracts evaluated after their preparation and twelve months later r—correlation coefficient, _p_—probability. Figure 9: Correlations between in vitro SPF values and antioxidant activity of the _Lavandula angustifolia_ herb and flower extracts evaluated after their preparation and twelve months later r—correlation coefficient, _p_—probability. _GC-MS Analysis of the Obtained Alcoholic Extracts by the Ultrasound-Assisted Extraction_  
The antioxidant capacity studies of the obtained extracts showed that the most active were the alcoholic extracts obtained during the 60 min extraction. For the qualitative identification of ingredients (organic compounds) in 24 extracts prepared from the flowers and herbs of _Lavandula angustifolia_ in solvents such as ethanol, methanol, n-propanol, and isopropanol, the GC-MS method was used. Table 3 presents the list of area percentages (area %) of the organic compounds identified by the GC-MS method in the alcoholic extracts for which antioxidant activity has been described in scientific literature.