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All Journal BERKALA SAINSTEK Indonesian Chimica Letters
Zulfikar, Z.
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Mathematics Physics

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Identification and determination α and β-acids from Columbus hops using Reverse Phase High Pressure Liquid Chromatography Zulfikar, Z.; Antje, Labes
Indonesian Chimica Letters Vol. 1 No. 2 (2022)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (752.048 KB) | DOI: 10.19184/icl.v1i2.206

Abstract

The present study has demonstrated the  HPLC method for identification and determination a and b-acids in Columbus hops. the measurement conditions has been set up included the use of Reverse phase C18 column Chromolith, gradient elution with methanol (A) and Acetonitril acidified with phosphate buffer at pH 2.8. While the flow rate has been applied of 0.8 mL/min, and it is run for 25 minutes. The separation of standard and sample has been monitored using UV variable detector in the rang of 300-340 nm. Pretreatment sample has been done using SPE with the cartridge of C18 similar to the analyte column. The results found that a four predominant peaks for α and β-acids, namely cohumulone (6.6 min), the second peak represents a mixture of humulone and adhumulone (8.9 min),  the third peak is colupulone (15.9 min) and the fourth is  a mixture of lupulone and adlupulone (16.7 min). The quantity of sample has been determined according to multipoint calibration using ICE2 standard, the sample found are 0,209 g/L cohumulone, 1.087 g/L of humulone and adhumulone, 0,349 g/L of Colupulone and 0.630 g/L of mixture of lupulone and adlupulone. In addition it is high precision measurement that is indicated by the value of RSD less than 1%.  
Sintesis Silika Gel Berbasis Fly Ash Batu Bara PLTU Paiton Sebagai Adsorben Zat Warna Rhodamin B Aisah, Siti; Zulfikar, Z.; Sulistiyo, Yudi Aris
BERKALA SAINSTEK Vol 6 No 1 (2018)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v6i1.7761

Abstract

Abu terbang batu bara dengan prosentase kandungan SiO 2 telah berhasil digunakan sebagai bahan baku pembuatan Silika Gel. Karakteristik silika gel diketahui dengan munculnya gugus fungsi silanol dan siloksan dengan FTIR, struktur kristal tak beraturan (amorf) dengan XRD, bentuk partikel bola (spherical) dan analisis unsur dengan EDX. Silika gel yang dihasilkan masih mengandung sedikit pengotor oksida alumina dan oksida natrium. Pengujian kapasitas adsorpsi Rhodamin-B silika gel lebih besar dibandingkan abu terbang dengan model adsorsi keduanya mengikuti model isotermal Langmuir dengan konsentrasi optimum pada 200 ppm. Kinetika adsorpsi mengikuti model Pseudo Second Order dimana laju adsorpsi silika gel sedikit lebih tinggi dibanding abu terban, tepai perbedaaanya tidak signifikan.Kata Kunci: zat warna Rhodamin B, silika gel, abu terbang batubara, Isotermal adsorpsi, kinetika adsorpsi
Co-Authors Antje, Labes Siti Aisah Yudi Aris Sulistiyo, Yudi Aris