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Bertha Mangallo
Jurusan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Papua
Agriculture, Biological Sciences & Forestry Chemistry Mathematics Physics

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Potential of Carbon-Chitosan Composite as Biosorbent of Heavy Metal Cu(II) Bertha Mangallo
Jurnal Natural Vol. 18 No. 2 (2022): Jurnal Natural
Publisher : FMIPA Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/jn.v18i2.181

Abstract

This research focuses on adsorption technology from natural sources (biosorbents), esspecially optimizing the potential of composites chitosan as biosorbents for heavy metal waste . The target to be achieved from this research is to obtain the technology of synthesis carbon-chitosan composites for adsorption Cu(II) metal. The study of the characteristics of the chitosan composite with FT-IR, while the adsorption capacity was determined by AAS. The research stages include the isolation of chitin from shrimp shells, deasetilation of chitin into chitosan, the synthesis of charcoal from palm shell, the synthesis of the carbon–chitosan composite (KCK), and the characterization and study adsorption of the chitosan composite on Cu(II) metal. The results of the analysis of the adsorption capacity of chitosan composites showed that formulation of Carbon-Chitosan (KCK) which gave the greatest adsorption toward Cu(II) metal was at a ratio of 1:10 (w/v), which was 2.3037 x 10-4 mol/ g.
Antidiabetic Activity of Methanol Extract of Bark of Alstonia scholaris from Papua Nitya Praptiwi Nitya Praptiwi; Bertha Mangallo
Jurnal Natural Vol. 18 No. 2 (2022): Jurnal Natural
Publisher : FMIPA Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/jn.v18i2.187

Abstract

One of the biological wealth that grows in Papua is Alstonia scholaris, known by the Maybrat tribe as the swe plant and is used as a traditional medicine for antidiabetic. The Swe tree contains a lot of white sap and tastes very bitter. There is also a bitter taste in the roots, bark, and leaves so it is thought to contain a lot of bioactive compounds of alkaloids which have the potential as antidiabetic. This study aims to extract and determine of antidiabetic activity by the inhibition activity of the α-glucosidase of methanol extract of bark of Alstonia scholaris from Papua as a basis for the development of antidiabetic drugs based on local resources. The method used was extraction by maceration, phytochemical screening test, inhibition activity of the α-glucosidase test and functional group analysis using FTIR. The results of phytochemical screening showed that methanol extract of bark of Alstonia scholaris from Papua was strongly positive containing secondary metabolites of alkaloids and flavonoids. Analysis of functional groups with FTIR showed that the secondary metabolite compound was thought to contain -OH functional group, C=C stretch and C=O group. IC50 value of Alstonia scholaris bark MeOH extract showed 0.97 µg/mL for α-glucosidase inhibition. This study suggest the methanol extract of bark of Alstonia scholaris might be considered as potential source of bio active constituents with excellent antidiabetic activity.
EFEKTIVITAS METODE SAND FILTER DALAM MENURUNKAN TINGKAT KEKERUHAN DAN KADAR E.COLI PADA AIR SUMUR Bertha Mangallo; Reynom Alfontus; Agnes Dyah Novitasari
Jurnal Natural Vol. 19 No. 1 (2023): Jurnal Natural
Publisher : FMIPA Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/jn.v19i1.210

Abstract

This study aims to determine the effectiveness of the sand filter method in reducing turbidity and e.coli levels in dug well water. The research method involved preparing filter media consisting of sand and beach pebbles, charcoal from coconut shells, pottery made from clay, and palm fiber. Water treatment is carried out using a filtration column containing filter media. The characteristics of dug well water before processing showed a turbidity level of 6.5 NTU and levels of e.coli ≥1898 CFU/100 mL. The results of the analysis of the quality of processed water using the sand filter method show that the effectiveness of the sand filter method in reducing turbidity levels reaches 100% while reducing e.coli levels reaches 95%.
Co-Authors Agnes Dyah Novitasari Nitya Praptiwi Nitya Praptiwi Reynom Alfontus