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Nastasya Nunki Diah Titik Mutiarawati Endah Prayekti


Crystal violet and Safranin are dyes in Gram staining, which are carcinogenic. Alternative safe materials are needed to minimize the use of carcinogenic properties. Purple sweet potato (Ipomoea batatas L.) peels were the candidate of the alternative dye source because of its high anthocyanin pigment. The purpose of this study was to determine purple sweet potato (Ipomoea batatas L.) peels extract as an alternative to Gentian violet in Gram staining of bacteria. Extracts obtained from purple sweet potato peels studied with varying concentrations of 50%, 60%, and 75% for 1, 3, and 5 min as a substitute for Gentian violet on Bacillus sp. The parameters observed from this study based on visual field clarity, glass slide cleanliness, contrast, bacterial shape, bacterial colour. Each extract concentration compared with a control group using Gentian violet. The results showed that optimum staining in 50% concentration for 5 min, 60% concentration for 5 min, 75% concentration for 3 min, and 5 min respectively. The present study exhibited the potency of Ipomoea batatas L. peels extract as an alternative staining agent.


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Nunki, N., Titik Mutiarawati, D. and Prayekti, E. (2020) “PURPLE SWEET POTATO (Ipomoea batatas L.) PEELS EXTRACT AS AN ALTERNATIVE DYE FOR BACTERIA GRAM STAINING”, Indonesian Journal of Medical Laboratory Science and Technology, 2(2), pp. 76–84. doi: 10.33086/ijmlst.v2i2.1655.
Ipomoea batatas L., Gentian violet, bacteria Gram taining, Bacillus sp.


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Nastasya Nunki, Department of Medical Laboratory Technology, Faculty of Health, Universitas Nahdlatul Ulama Surabaya, Surabaya, Indonesia

Diah Titik Mutiarawati, Department of Medical Laboratory Technology, Poltekkes Surabaya, Surabaya, Indonesia

Endah Prayekti, Department of Medical Laboratory Technology, Faculty of Health, Universitas Nahdlatul Ulama Surabaya, Surabaya, Indonesia