Please read the two references which have showed the assessment of in vitro anti-inflammatory activity.
Mahendran, G., Manoj, M., Prasad, K. R., & Bai, V. N. (2015). Antioxidants, anti-proliferative, anti-inflammatory, anti-diabetic and anti-microbial effects of isolated compounds from Swertia corymbosa (Grieb.) Wight ex CB Clark–An in vitro approach. Food Science and Human Wellness, 4(4), 169-179.
Phosrithong, N., & Nuchtavorn, N. (2015). Antioxidant and anti-inflammatory activites of Clerodendrum leaf extracts collected in Thailand. European Journal of Integrative Medicine.