Research Article

Subcritical Water Extraction of Antioxidants from Curculigo latifolia Root

Table 1

Extraction yields, total phenolic content, and total flavonoid content of C. latifolia root extracts by subcritical water extraction (SWE) at different extraction conditions.

Temperature (°C)Time (min)Yield (g/100 g)TPC (mg GAE/g)TFC (mg RE/g)

1003018.4 ± 0.31a34.43 ± 0.25a5.72 ± 0.81b
1006015.3 ± 0.15b39.61 ± 0.13a8.5 ± 2.24a
1009014.2 ± 0.11b38.79 ± 0.14a9.79 ± 1.17a
10012015.5 ± 0.32b40.75 ± 0.55a8.3 ± 0.92a
1503025.35 ± 0.68a72.89 ± 1.14a7.83 ± 0.38b
1506020.0 ± 0.52b68.37 ± 4.79ab6.99 ± 0.51b
1509019.5 ± 1.41b61.47 ± 1.13b11.1 ± 0.52a
15012021.8 ± 0.38b64.60 ± 3.22ab10.4 ± 0.28a
1803036.5 ± 0.91a92.55 ± 2.83a13.26 ± 0.3a
1806031.4 ± 0.55b78.79 ± 0.69b11.05 ± 1.3ab
1809022.6 ± 0.49c66.60 ± 0.57c8.68 ± 0.44b
18012023.5 ± 0.11c48.58 ± 0.57d9.08 ± 0.3b
2003014.0 ± 0.26b84.65 ± 1.97a7.8 ± 0.44b
2006016.0 ± 1.48a87.97 ± 0.13a10.71 ± 0.4a
2009016.5 ± 0.52a86.39 ± 2.01a8.52 ± 0.5ab
20012012.0 ± 0.07c68.75 ± 0.76b9.86 ± 0.26ab

The values are expressed as mean ± standard deviation (n = 3). Different letters in the same column indicate that the means differ significantly by the Tukey test (). TPC: total phenolic content; TFC: total flavonoid content; GAE: gallic acid equivalents; RE: rutin equivalents.