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Table 2 Total phenolic content and individual phenolic compounds from leaf, stem and rhizome extracts of  Z. zerumbet

From: Variation in secondary metabolite production as well as antioxidant and antibacterial activities of Zingiber zerumbet (L.) at different stages of growth

Plant age (month-old) Plant parts Total phenolics Gallic acid Caffeic acid Ferulic acid Cinnamic acid
3 leaf 38.4 ± 2.35b 11.62 ± 1.50b 1.46 ± 0.28b 5.46 ± 0.77a 1.88 ± 0.27b
  stem 5.8 ± 0.37h 1.16 ± 0.53f 0.24 ± 0.06f ND 0.16 ± 0.06e
  rhizome 19.2 ± 1.42f 6.44 ± 0.49e 0.79 ± 0.06d 1.19 ± 0.26e 0.89 ± 0.05d
6 leaf 30.4 ± 2.16c 9.27 ± 1.03c 1.08 ± 0.04c 3.66 ± 0.22b 1.26 ± 0.31c
  stem 5.9 ± 0.33h 1.34 ± 0.64f 0.20 ± 0.05f ND 0.21 ± 0.05e
  rhizome 26.7 ± 2.83d 9.86 ± 0.96c 1.73 ± 0.53b 2.66 ± 0.17d 1.73 ± 0.41b
9 leaf 22.4 ± 1.69e 7.61 ± 0.86d 1.05 ± 0.09c 3.14 ± 0.19c 1.09 ± 0.22c
  stem 6.7 ± 0.52g 1.18 ± 0.66f 0.34 ± 0.03e 0.26 ± 0.09f 0.20 ± 0.07e
  rhizome 44.8 ± 3.16a 19.76 ± 2.54a 2.71 ± 0.79a 3.73 ± 0.36b 2.61 ± 0.34a
  1. Data are means of triplicate measurements ± standard deviation. Means not sharing a common single letter in each column for each measurement were significantly different at P ≤ 0.05. The units of total phenolics and phenolic compounds are mg gallic acid equivalents/g DM and mg/g DM, respectively. ND: not detected