Abstrato

Application of banana flower bracts extract in simple titrimetric techniques as an indicator

Kavita Gala, Satish Kolte

Extraction of Anthocyanin based compounds from banana flower bracts (Musa acuminata) was successfully carried out. The banana brats were grinded in a mixer with water. After grinding the mixture was filtered using a muslin cloth i.e. X1. The residue was shaken with methanol several times and the yellow liquid is X2. Both are used as indicators in various acid-base titrations. Both X1 and X2 contains derivatives of Anthocyanin which is responsible for its use as an indicator. It was found that X1 is not as effective as X2 as an indicator for neutralization reactions. X2 showed a distant red color in acidic medium and distant green color in alkaline medium. X2 showed similar results as phenolphthalein and methyl orange does in acid base titrations. Replicates of these titrations were performed to confirm the result obtained. Different concentrations of the indicator as well as varying concentration of the titrant and titer were used to check for the application of indicator. The experiment was repeated for different neutralization reactions like: 1. Strong acid versus Strong base 2. Strong acid versus Weak base 3. Weak acid versus Strong base. The R.S.D and C.V. was calculated for all the types of titrations. The method proved analytically valid hence, effect of using such natural extracts as indicators for volumetric quantitative analysis as compared with conventional indicators is possible with good agreement.