Isolation of natural universal indicator and preparation of pH paper from Calotropis gigantea Linn. floral aqueous and ethanolic extract and study of their applications and benefits.

R. B. More^a, S. S. Lalsare^b*, G. B. Nikam^c, C. K. Nerkar^d, S. L. Sangle^e, S.V.Chavan^f & B. S. Kale^b
aDepartment of Chemistry, MVP’S S. S. S. M. Arts, Science and Commerce College, Saikheda, Nashik, Maharastra, India
^aDepartment of Botany, MVP’S S. S. S. M. Arts, Science and Commerce College, Saikheda, Nashik, Maharastra, India
^bDepartment of Zoology, MVP’S K.R.T. Arts, B.H. Commerce and A.M. Science College, Nashik, Maharastra, India
^dDepartment of Chemistry, MGV’s L.V. H. Arts, Science and Commerce College, Panchavati, Nashik, Maharastra, India
^eDepartment of Chemistry, MVP’S Arts, Commerce and Science College, Nandgaon, Nashik, Maharastra, India
^fDepartment of Chemistry, R.L. Mahavidyalaya, Parola, Jalgaon, Maharastra, India

Received : 08^th January, 2024 ; Revised : 10^th February, 2024
DOI:-https://doi.org/10.5281/zenodo.14207640

Abstract– A variety of products, including test papers, pH paper strips, acid-base indicators, and medications, were made using floral extract. Many pigments, including minerals, flavonoids, and anthocyanin, are found in floral extracts. These pigments are highly sensitive to pH changes. The ethanolic and aqueous extracts of the petals of the Calotropis gigantea flower (Rui) were made in the current study. In various pH ranges of buffer solutions, noticeable color differences of flower extract of C. gigantea are observed. Many color pigments found in aqueous and ethanolic floral extract of C. gigantea are extremely sensitive to different chemical as per their pH variations. The synthetic indicators which are commonly used in our laboratory and the natural indicators which are prepared from aqueous and ethanolic floral extracts, provide almost identical outcomes. Using the same extracts, the pH paper and indicator have been prepared. The pH paper prepared is environmentally friendly, biodegradable and is helpful for laboratory work. This kind of research is a cheap, efficient, and natural substitute for artificial litmus paper, dye and Chemicals. C. gigantea extract indicator is more cost-effective and yield results with the same accuracy as synthetic indicators in acid base type titrations.

Key words: Calotropis gigantea, Aqueous and ethanolic extracts, Natural Indicator, Universal Indicator, pH paper, Eco friendly, Economic

Download Pdf