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All Journal Orbital: Jurnal Pendidikan Kimia Hydrogen: Jurnal Kependidikan Kimia
Indah, Marwa
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Chemistry Education

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Phytochemical Profile and Antioxidant Activity of Bandotan (Ageratum conyzoides L.) Leaves from East Kalimantan Hajar, Ayu Iradha Umi; Indah, Marwa; Miranda, Esti; Nuraini, Indah; Kusuma, Aldi; Erika, Farah
Hydrogen: Jurnal Kependidikan Kimia Vol. 13 No. 3 (2025): June 2025
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v13i3.16179

Abstract

Ageratum conyzoides L. is a wild plant known to contain secondary metabolites with potential antioxidant activity, such as flavonoids and phenolics. However, the content and activity of active compounds in the leaves of A. conyzoides growing in the Berau region, East Kalimantan, have not been extensively studied. This study aims to evaluate the phytochemical content and antioxidant activity of ethanol extracts from A. conyzoides leaves collected from the Batu Putih area, Berau. The samples, in the form of fresh leaves, were dried and ground before being extracted using the maceration method with 96% ethanol as the solvent. The resulting extract was then subjected to phytochemical screening to identify groups of active compounds and tested for antioxidant activity using the DPPH (2,2-diphenyl-1-picrylhydrazyl) method, with absorbance measured at a wavelength of 420 nm. Phytochemical screening results indicated the presence of alkaloids, phenolics, and tannins, while flavonoids, terpenoids, and triterpenoids were not detected. The antioxidant assay showed that the extract exhibited strong activity, with an IC50 value of 61.89 ppm, although it was still higher than that of vitamin C, which had an IC50 value of 26.77 ppm. In conclusion, the ethanol extract of A. conyzoides leaves from Batu Putih has potential as a natural antioxidant source and is worthy of further development in the pharmaceutical field.
Integration of Toraja Local Wisdom into Contextual Chemistry Learning Indah, Marwa; Erika, Farah; Usman, Usman
Orbital: Jurnal Pendidikan Kimia Vol. 9 No. 2 (2025): Orbital: Jurnal Pendidikan Kimia
Publisher : Chemistry Education Department of Education and Teaching Faculty

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19109/ojpk.v9i2.31528

Abstract

This study explores traditional chemical practices within the Toraja community, an area of knowledge that remains underdocumented in existing scholarship. The research aims to: (1) describe chemical practices involved in the Rambu Solo’ funeral ceremony; (2) examine techniques for processing natural materials; and (3) discuss their pedagogical implications for chemistry education rooted in local wisdom. Using a qualitative ethnographic approach, the study was conducted in Tana Toraja and involved two purposively selected key informants: a teacher and a local cultural leader. Data were collected through in-depth interviews, direct observations, and documentation, then analyzed thematically. The analysis revealed two main themes. First, the use of pine leaves (Pinus merkusii) and tille wood in Rambu Solo’ functions as natural antiseptics and preservatives, a finding supported by literature on the bioactivity of terpenoids and phenolic compounds. Second, the fermentation of ballo’ and the production of natural dyes demonstrate biochemical processes and principles of green chemistry utilizing renewable natural resources. These findings show that Torajan traditional practices provide authentic and meaningful contexts for chemistry education. Incorporating such indigenous knowledge into the curriculum can make learning more relevant while helping preserve culture. Overall, this research offers an initial empirical basis for developing ethnoscience-based learning modules and suggests further studies involving quantitative chemical analyses and the development of innovative instructional materials. This approach can improve students’ scientific literacy and promote education for sustainable development.
Co-Authors Farah Erika Hajar, Ayu Iradha Umi Indah Nuraini, Indah Kusuma, Aldi Miranda, Esti Usman Usman