Original article Effect of drying on phytochemical composition of lemongrass (Cymbopogoncitratus (DC.) Stapf) powder

Abstract

In the present investigation, the effect of drying on phytochemical composition of lemongrass powder was evaluated. The lemongrass powder was prepared by traditional (Sun and shade) drying and cabinet drying (45 o C). The qualitative determination of phytochemicals such as alkaloid, flavonoid, tannin, saponin, phenol, carbohydrate and glycoside in aqueous, ethanol, acetone and chloroform extract were carried out. It was revealed that, next to ethanolic extract, aqueous extract showed the presence of rich variety of secondary metabolites. The total phenolic content of cold and hot extract was 2.6 ± 0.02 and 3.8 ± 0.02 mg of gallic acid equivalent/g dw basis. The total flavonoid content in cold and hot percolation were found to be 7.6 ± 0.03 and 8.1 ± 0.03 µg/g of quercetin equivalent dw basis. The alkaloids, saponins, steroids and tannin contents were 1.64 ± 0.05, 1.11 ± 0.05, 0.45 ± 0.05 and 0.93 ± 0.05 g/100 g. The minimum reduction of total phenol content observed in shade drying treatment in cold (15.38%) and hot (13.15%) aqueous extract, whereas maximum reduction in cold (38.46%) and hot (26.31%) extract by cabinet drying. The minimum reduction in flavonoid contents were found in shade drying in cold (3.94%) and hot (3.70%) aqueous extract, whereas maximum reduction in cold (13.15%) and hot (13.58%) aqueous extracts by cabinet drying. The alkaloids, steroid, saponin and tannin recorded their highest values in cabinet drying, i.e., 2.61, 0.72, 2.21 and 2.03 g/100 g, respectively over sun and shade drying.

Effects of Three Herbs on Methane Emissions from Beef Cattle

“…This reduction in CH 4 production could (partially) be attributed to the high polyphenol and tannin contents in the CC used, which may have affected fiber-degrading bacteria and protozoa. For example, the polyphenol content of CC (7 g/kg DM) used in Experiment 2 (Table 1) was almost twice that (2.6 to 3.8 g/kg DM) reported by Thorat et al [54]. Similarly, the TT content (9.9 g/kg DM) of our CC was higher than that (6 g/kg DM) reported by Avoseh et al [55].…”