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. 2021 Jun 25;12:680754. doi: 10.3389/fphar.2021.680754

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Copyright © 2021 Wang, Wang, Tan, Li, Jiang and Tang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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PCA plot based on the DPPH radical scavenging activities (DR) and superoxide radical scavenging activities (SR) of the essential oils from white pepper and black in the present study and five different habitats reported by Li et al. (: White pepper; : Black pepper; WPEO and BPEO in this study; 1 (Guangxi white), 2 (Guangxi black), 3 (Guangdong white), 4 (Guangdong black), 5 (Yunnan white), 6 (Yunnan black), 7 (Fujian white), 8 (Fujian black), 9 (Hainan white), and 10 (Hainan black) in Li et al.’s study^[18]; WPEO, white pepper essential oil; BPEO, black pepper essential oil).

Inline graphic — PCA plot based on the DPPH radical scavenging activities (DR) and superoxide radical scavenging activities (SR) of the essential oils from white pepper and black in the present study and five different habitats reported by Li et al. (: White pepper; : Black pepper; WPEO and BPEO in this study; 1 (Guangxi white), 2 (Guangxi black), 3 (Guangdong white), 4 (Guangdong black), 5 (Yunnan white), 6 (Yunnan black), 7 (Fujian white), 8 (Fujian black), 9 (Hainan white), and 10 (Hainan black) in Li et al.’s study^[18]; WPEO, white pepper essential oil; BPEO, black pepper essential oil).