Tri Reksa Saputra
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KARAKTERISASI SILIKA DARI ABU AMPAS TEBU Tifa Paramitha; Tri Reksa Saputra; Amelia Nur Aliah; Arijan Vevayose Tarigan; Mukhtar Ghozali
KOVALEN: Jurnal Riset Kimia Vol. 5 No. 3 (2019): Edisi Desember
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (443.321 KB) | DOI: 10.22487/kovalen.2019.v5.i3.14309

Abstract

Silica has been successfully extracted from sugarcane bagasse ash by using alkali method. Extraction was carried out using sodium hydroxide solution to obtain sodium silicate solution and solid residue. Then, hydrochloric acid solution was added to sodium silicate solution until pH of solution was 7 and silica was formed. Furthermore, silica was heated in oven at 150 ˚C and calcined at 700 ˚C. Variation of this study were extraction time (1, 2 and 3 hours). The synthesized silica were characterized functional groups, acidity level, water adsorption ability and adsorption ability of Cu2+ ion. The results of FTIR analysis showed that all silica contain siloxane group. Silanol group did not appear because during calcination process occured the condensation reaction of silanol group. Other characterization results showed that silica with extraction time of 2 hours had highest acidity level, water adsorption ability and adsorption ability of Cu2+ ion, which were 6.201 mmol/gram, 86.41% and 92.55%. Keywords : bagasse ash, extraction, silica, siloxane
Isolasi Senyawa Flavonoid dari Tumbuhan Cocor Bebek Sebagai Sediaan Inhibitor Korosi Tri Reksa Saputra; Esti Purnamasari; Anderson Arnold Aloanis
Jurnal Kimia Fullerene Vol 4 No 2 (2019): Fullerene Journal of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (368.805 KB) | DOI: 10.37033/fjc.v4i2.97

Abstract

Berbagai spesies tanaman Kalanchoe telah digunakan secara luas untuk bahan baku obat tradisional dan juga sebagai tanaman hias. Penelitian ini merupakan penelitian lanjutan dari pencarian senyawa metabolit sekunder dari tumbuhan Kalanchoe Indonesia. Daun segar Kalanchoe pinnata sebanyak 6 kg diekstraksi dengan metanol pada temperatur kamar sehingga diperoleh ekstrak pekat metanol. Ekstrak pekat metanol selanjutnya dipartisi berturut-turut dengan n-heksana dan etil asetat. Ekstrak semipolar kemudian dilakukan isolasi senyawa flavonoid dan dihasilkan isolat berwarna kuning melalui berbagai teknik kromatografi. Struktur kimia isolat ditentukan berdasarkan hasil analisis spektroskopi UV, IR, MS, 1H-NMR, 13C-NMR serta perbadingan data spektroskopi yang diperoleh dari literatur dan diidentifikasi sebagai senyawa flavonoid yaitu 3,3’,4’,5,7 pentahidroksiflavon atau kuersetin.