Chemical constituents of the extracts of the knotwood of Pinus roxburghii Sarg. and their antioxidant activity

Chemical composition, antioxidant, and antimicrobial activities of P. roxburghii oleoresin essential oils extracted by steam distillation, superheated steam, and supercritical fluid CO2 extraction

“…Similar findings were observed by Sharma et al. (2020) (Tsvetkov et al., 2019) in which P. roxburghii bark essential oil contained 3‐carene as the major component. EO of P. mugo needles extracted by SD contained 3‐carene as a major compound (Ju et al., 2019).…”

“…Similarly, in another study it was reported that GC-MS analysis of P. roxburghii leaves EO contained 3-carene as the major component (Wang et al, 2018). Similar findings were observed by Sharma et al (2020) (Tsvetkov et al, 2019) in which P. roxburghii bark essential oil contained 3-carene as the major component. EO of P. mugo needles extracted by SD contained 3-carene as a major compound (Ju et al, 2019).…”

“…The EOs antioxidant activity is due to their ability to donate the hydrogen, resulting in the scavenging of free radical. This leads the reduction of DPPH and discoloration of violet color (Tsvetkov et al., 2019). Antioxidant activity of P. roxburghii oleoresin EO obtained by different extraction techniques is given in Table 1.…”

“…EOs are a complex mixture of variety of compounds, making it difficult to assess specific compound responsible for their antioxidant activity (Shuaib et al., 2013). It has been reported that scavenging activity of P. roxburghii, Pinus wallichiana , and Pinus gerardiana extracts might be due to the presence of phenolic compounds, which can donate electrons to H 2 O 2 converting it to H 2 O (Tsvetkov et al., 2019). According to Tsvetkov et al.…”

Chemical composition and biological potential of Pinus roxburghii oleoresin essential oils extracted by steam distillation, superheated steam, and supercritical fluid CO2 extraction

“…According to(Tsvetkov et al, 2019), the antioxidant activity of crude acetone extracts of Pinus roxburghii knot wood compounds was less than Gallic acid. Moreover, it was also mentioned that antioxidant activity was related to number of hydroxyl groups present on benzene ring, the degree of shielding of the hydroxyl groups by other functional groups, and the nature of other substituents present at the benzene ring capable of increasing and decreasing the electron density of the ring and thus modifying the oxidizability of the hydroxyl groups(Tsvetkov et al, 2019).3…”