Musa Acuminata Plant Essay

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CHAPTER 3

MATERIALS AND METHOD

3.1 Materials
3.1.1 Plant Sample Fresh and apparently uninfected leaves of Musa acuminata plant (Berangan) were identified and collected from Ayer Lanas, Jeli Kelantan. The selection of the leaves is based on the uniform colour and the maturity stage.

3.1.2 Chemical and Equipment Chemical and equipment used for this research were methanol, acetone, ethanol, distilled water, hexane (Merck), ethyl acetate (Merck), acetonitrile (Merck), 2,2-diphenyl-1-picrylhydrazyl agent (Sigma Aldrich), sodium carbonate Anhydrous (grade AR, SCHMIDT), sodium nitrite, sodium hydroxide, silica gel 60 (size: 0.063-0.20mm, Merck), ascorbic acid (Merck), gallic acid (Sigma Aldrich), aluminium chloride (Sigma Aldrich), vacuum pump, heating bath (BUCHI), rotary evaporator (BUCHI), TLC silica gel plate 60F245 (Aluminium, Merck), UV-spectrometer (Thermo scientific), column (size: 14/23, 24/29, FAVORIT), vortex (VELP), ultra-violet radiation (230V- 50/60Hz), ultra-sonic cleanser (JEIOTECH) and High Performance Liquid Chromatography (SHIMADZU, Japan). 3.2 Method
3.2.1 Preparation of Fresh …show more content…

This spectrophotometric assay uses the stable radical 2, 2-diphenyl-1-picrylhydrazyl (DPPH) as a reagent. 2 mL of several different concentrations of the samples were mixed with 2 mL of 0.004% DPPH in methanol. The mixture was shaken vigorously and then immediately stored in the dark for 30 minutes at room temperature before placed in a UV-Vis spectrophotometer to monitor the decrease in absorbance at 517 nm. Methanol was used as a blank and methanol mixed with DPPH in methanol was used as a positive control. Ascorbic acid, a stable antioxidant, was used as a synthetic reference. Analysis was carried out in

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