Jura, Minarni R.
Universitas Tadulako

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ANALISIS SENYAWA ALKALOID DAUN TANAMAN JOHAR (Cassia siamea Lmk.) YANG BERPOTENSI SEBAGAI INSEKTISIDA PADA NYAMUK Setiawan, Topan; Aminah, Sitti; Jura, Minarni R.
Jurnal Akademika Kimia Vol 2, No 3 (2013)
Publisher : Universitas Tadulako

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Abstract

Research about alkaloid compound of johar plant leaf (Cassia siamea Lmk.) which potential as insecticide at mosquito. The methods are used is laboratory experiment from johar plant leaf extract. Alkaloid has product from separated extract of johar plant leaf. Maximum wave has product by UV-Vis spectrophotometer is 306 nm. TLC product of johar plant leaf extracts are 2 components (Rf 0.89 and 0.91). TLC product of johar plant leaf alkaloid is 1 component (Rf 0.91). The product of HPLC showed 4 components for johar plant leaf and 2 components for alkaloid. The insecticide force of 25 mosquitos did by third for extract and alkaloid. The products are johar leaf extract have insecticide force for each treatment are 14, 10 and 14 mosquitos although alkaloids are 13, 8 and 2 mosquitos.
Penentuan Kadar Flavonoid dan Vitamin C dalam Umbi Bawang Hutan (Eleutherine bulbosa (Mill) Urb) yang Berasal dari Desa Matantimali Kabupaten Sigi Karmila, Karmila; Jura, Minarni R.; Tiwow, Vanny M. A.
Jurnal Akademika Kimia Vol 7, No 2 (2018)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (129.239 KB) | DOI: 10.22487/j24775185.2018.v7.i2.10395

Abstract

This study aimed to determine flavonoids and vitamin C levels contained in forest onion bulbs (Eleutherine bulbosa (Mill) Urb). Determination of the levels of flavonoids in forest onion bulbs extracted by maceration in etanol-HCl 1%, while vitamin C is extracted with 96% ethanol. Flavonoids and vitamin C levels in samples of forest onion bulbs were determined using UV-Vis spectrophotometer. The result showed that the flavonoids levels obtained was as much as 13.4058 mg/ 100 g, while vitamin C levels was as much as 31.678 mg/100 g.
Uji Aktivitas Antioksidan Ekstrak Etanol Biji Buah Merah (Pandanus Conoideus De Vriese) Asal Kabupaten Poso Sulawesi Tengah Sulaeha, Siti; Jura, Minarni R.; Rahman, Nurdin
Jurnal Akademika Kimia Vol 6, No 3 (2017)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (237.761 KB) | DOI: 10.22487/j24775185.2017.v6.i3.9442

Abstract

Red fruit seeds have not been studied and known benefits, therefore it needed scientific information about the content and benefits of red fruit seeds. This study aims to analyze the antioxidant power red fruit seed extract as well determining the IC50 value of red fruit seed extract which has the ability of natural antioxidants. Determination of free radical DPPH (1,1-diphenyl-2-picrylhidrazyl) after the addition of red fruit seeds extract is determined using UV-Vis spectrophotometer. Variations in the concentration of the red fruit seed extract used is 20 ppm, 40 ppm, 60 ppm, 80 ppm and 100 ppm.The positive control used is vitamin C with the same concentration. While the negative control using DPPH solution dissolved in absolute ethanol. The results showed IC50 values obtained for the red fruit seed extract and vitamin C are 223.8 ppm and 1.73 ppm. Based on the IC50 data can be known that vitamin C antioxidants more powerful than red fruit seed extract which belongs to natural antioxidants are very weak.
Pemanfaatan Lingkungan Alam Sekitar Sebagai Sumber Belajar Dalam Meningkatkan Hasil Belajar Siswa Pada Pelajaran IPA Di Kelas IV SDN 6 Biau Patangari, Intan Y.; Mestawaty, Mestawaty; Jura, Minarni R.
Jurnal Kreatif Online Vol 6, No 1 (2018): Jurnal Kreatif Online
Publisher : Jurnal Kreatif Online

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Abstract

Penelitian ini bertujuan untuk meningkatkan hasil belajar siswa pada mata pelajaran IPA di kelas IV SD Negeri 6 Biau dengan memanfaatkan lingkungan alam sekitar. Jenis penelitian ini adalah penelitian tindakan kelas yang dilaksanakan dalam 2 siklus, setiap siklus terdiri dari empat tahap yaitu perencanaan, pelaksanaan tindakan, observasi dan refleksi. Data yang diperoleh dalam penelitian ini meliputi hasil belajar siswa, hasil observasi aktivitas guru dan siswa, diambil dari lembar observasi kegiatan guru dan lembar observasi aktivitas siswa. Hasil penelitian menunjukkan bahwa pada tindakan siklus I yang tuntas secara individu berjumlah 10 orang dari 15 siswa, sehingga diperoleh ketuntasan belajar klasikal 61% dan daya serap klasikal sebesar 63,8%. Dengan nilai rata-rata hasil belajar siswa Siklus I adalah 66,7 dalam kriteria baik Pada tindakan siklus II diperoleh ketuntasan belajar klasikal 100% dan daya serap klasikal 79,7 %. nilai rata-rata hasil belajar adalah 91,7 telah memenuhi indikator keberhasilan dengan daya serap klasikal minimal 70% dan ketuntasan belajar klasikal minimal 80%. dengan hasil observasi siswa sebesar 91,66 %  sehingga nilai rata berada dalam kriteria sangat baik. Berdasarkan data hasil penelitian pada siklus I dan II, maka dapat disimpulkan bahwa pemanfaatan lingkungan alam sekitar sebagai sumber belajar dapat meningkatkan Hasil belajar IPA di Kelas IV SDN 6 Biau. Kata Kunci: Hasil Belajar IPA, Lingkungan Sekitar, Siswa Kelas IV