Garuda - Garba Rujukan Digital

PENGARUH CARA PENGERINGAN TERHADAP PEROLEHAN EKSTRAKTIF, KADAR SENYAWA FENOLAT DAN AKTIVITAS ANTIOKSIDAN DARI DAUN DEWA (Gynura pseudochina (L.) DC.) Harrizul Rivai; Hazli Nurdin; Hamzar Suyani; Amri Bakhtiar
Majalah Obat Tradisional Vol 15, No 1 (2010)
Publisher : Faculty of Pharmacy, Universitas Gadjah Mada

Effects of drying methods in gaining of extractive, phenolic content and antioxidant activity in Gynura pseudochina (Lour.) DC leaves have been investigated. The drying methods tested were air-drying at ± 25 oC, oven-drying at 40 OC, oven-drying at 60 OC, microwave oven-drying and fresh samples as control. Results revealed that drying of the fresh plant caused the decrease of extractive obtainability, phenolic content and antioxidant activity. There were significant differences among drying methods (P < 0.05). Among the drying methods tested, the highest extractive obtainability was by microwave oven-drying, whereas the highest phenolic concentration and antioxidant activity were by air-drying at ± 25 oC.

Adsorpsi Cu2+ Menggunakan Nanofiber Polisulfon-FeOOH Yang Disintesis Dengan Metode Elektrospinning Dini Hariyati Adam; Hamzar Suyani; Muhamad Nasir; Safni Safni; Willy Cahya Nugraha
Jurnal Litbang Industri Vol 3, No 2 (2013)
Publisher : Institution for Industrial Research and Standardization of Industry - Padang

It had been done a research about adsorption of Cu2+ using polysulfone-FeOOH nanofiber prepared by elektrospinning method. Polysulfone-FeOOH nanofiber was synthesized by dissolving polysulfone pellets in 30 mL dimethylacetamide (DMAc). The effects of process conditions such as concentration, distance between the nozzle and collector, voltage and flow rate on the morphology and diameter of nanofibers were investigated. The optimum conditions of polysulfone nanofiber synthesizing was obtained with concentration 25%, distance 12 cm, voltage 25 kV, and flow rate 0.05 mL/min with average diameters of fibers was 762.927 nm. Polysulfone nanofiber was coated with FeOOH to increase the adsorbtion capacity of Cu2+. The results showed that optimum condition for removal of Cu2+ used polysulfone-FeOOH nanofiber was obtained in 2 hours contact time, pH 6, adsorbent dosage 25 mg, and concentration of Cu2+ 10 mg/L with adsorbstion capacity was 9.79 mg/g, while for polysulfone nanofiber the adsorption capacity was 8.34 mg/g. The adsorbtion pattern of Cu2+ by the both of adsorbent followed the Freundlich isotherm pattern.ABSTRAK Penelitian mengenai pemisahan ion Cu2+menggunakan nanofiber polisulfon-FeOOH yang disintesis dengan metode elektrospinning telah dilakukan. Nanofiber polisulfon P-3500 disintesis dengan cara melarutkan pelet polisulfon ke dalam 30 mL dimethylacetamide (DMAc). Pengaruh kondisi seperti konsentrasi, jarak nozzle dengan kolektor, tegangan dan laju alir terhadap morfologi dan diameter serat dipelajari. Kondisi optimum pembuatan nanofiber polisulfon diperoleh dengan konsentrasi 23 %, jarak 12 cm, tegangan 25 kV, dan laju alir 0,05 mL/min dengan ukuran diameter serat rata-rata 762,927 nm. Nanofiber yang terbentuk dilapisi dengan FeOOH untuk meningkatkan kapasitas penyerapannya terhadap ion Cu2+. Dari hasil penelitian didapatkan kondisi optimum untuk pemisahan ion Cu2+ menggunakan nanofiber polisulfon-FeOOH yaitu waktu kontak 2 jam, pH 6, bobot adsorben 25 mg, dan konsentrasi Cu2+10 mg/L dengan kapasitas penyerapan 9,79 mg/g, sedangkan untuk nanofiber polisulfon kapasitas penyerapan 8,34 mg/g. Pola penyerapan Cu2+ untuk kedua jenis adsorben lebih sesuai dengan pola isoterm Freundlich

Pengaruh Rasio Campuran Etanol-Air sebagai Pelarut Ekstraksi terhadap Mutu Ekstrak Herba Meniran (Phyllanthus niruri Linn.) HARRISUL RIVAI; HAZLI NURDIN; HAMZAR SUYANI; AMIN BAKTIAR
JURNAL ILMU KEFARMASIAN INDONESIA Vol 8 No 2 (2010): JIFI
Publisher : Fakultas Farmasi Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1387.147 KB)

Effects of ratios of ethanol-water as extracting solvent in obtaining extractable material, phenolic compounds and antioxidant activity from the herb of Phyllanthus niruri Linn. have been investigated. The ratios tested were 100:0, 80:20, 70:30, 60:40 and 50:50. The results revealed that the ratio of ethanol-Water used gave significant effect on extractable material, phenolic compounds and antioxidant activity (p<0.05). Among the ratios tested, the best result was obtained by ethanol-water of 60:40 as extracting solvent for the herb of Phyllanthus niruri Linn. to obtain phenolic compound which has antioxidant activity.

DEGRADASI SENYAWA PERMETRIN DENGAN MENGGUNAKAN ZEOLIT ALAM TERPILAR TiO2-ANATASE SECARA SONOLISIS Zilfa Zilfa; Hamzar Suyani; Safni Safni; Novesar Jamarun
Jurnal Ecolab Vol 5, No 1 (2011): Jurnal Ecolab
Publisher : Pusat Standardisasi Instrumen Kualitas Lingkungan Hidup Laboratorium Lingkungan (P3KLL)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jklh.2011.5.1.35-43

Permetrin merupakan golongan insektisida piretroid sintetik yang kurang toksik bagi mamalia tapi sangat toksik bagi ikan, serangga dan mikroorganisme air Penelitian tentang degradasi senyawa permetrin telah dilakukan dengan menggunakan zeolit alam terpilar TiO2-anatase secara sonolisis pada beberapa kondisi perlakuan.. Degradasi dilakukan secara sonolisis menggunakan gelombang ultrasonik dengan frekuensi 45 KHz. Sampel yang digunakan adalah permetrin 96,1%. Sedangkan zeolit alam terpilar TiO2-anatase digunakan sebagai katalis untuk membantu degradasi secara cepat dan efisien. Hasil iradiasi dianalisis dengan menggunakan spektrofotometer UV pada panjang gelombang 272 nm. Degradasi permetrin 20mg/L pada suhu 40oC dan waktu iradiasi 120 menit, tanpa penambahan zeolit alam terpilar TiO2- anatase mencapai 22,23%. Sedangkan degradasi permetrin 20 mg/L pada suhu 40oC dan waktu iradiasi 75 menit dengan penambahan 50 mg zeolit alam terpilar TiO2- anatase menghasilkan 81,10 %.

SIMULTANEOUS DETERMINATION OF CADMIUM, COPPER AND LEAD IN SEA WATER BY ADSORPTIVE STRIPPING VOLTAMMETRY IN THE PRESENCE OF CALCON AS A COMPLEXING AGENT Deswati Deswati; Hamzar Suyani; Safni Safni; Umiati Loekman; Hilfi Pardi
Indonesian Journal of Chemistry Vol 13, No 3 (2013)
Publisher : Universitas Gadjah Mada

A selective and sensitive adsorptive stripping voltammetric (AdSV) procedure for the simultaneous determination of cadmium, copper and lead in the sea water was conducted. The aim of this research is to get optimum condition for simultaneous determination of cadmium, copper and lead. Adsorptive stripping voltammetry has been used for determination of trace amount of Cd(II), Cu(II) and Pb (II) by using calcon as a complexing agent. The parameters studied were variation of calcon concentration, pH, accumulation potential and accumulation time. In this study, the optimum conditions were calcon concentration of 0.6 mM, pH = 4.0, accumulation potential of -0.7 V and accumulation time of 80 sec. At the optimum conditions, the relative standard deviation were 8.78%, 3.12%, and 4.02% for Cd(II), Cu(II) and Pb(II) respectively for eight replicates (n = 8) measurements of 10 μg/L mixed standard solution of Cd(II), Cu(II) and Pb(II). The method was applied to the direct simultaneous determination of Cd(II), Cu(II) and Pb(II) in sea water around Bungus, Padang City. Concentration of Cd(II), Cu(II) and Pb(II) in samples were equal to 1.8 μg/L for Cd(II), 38.6 μg/L for Cu(II) and 0.7 μg/L for Pb(II) with recovery of 87.03%, 98.80%, and 95.73%, respectively.

THE METHOD DEVELOPMENT OF ANALYSIS Cd, Cu, Pb AND Zn IN SEA WATER BY ABSORPTIVE STRIPPING VOLTAMMETRY (ASV) IN THE PRESENCE OF CALCON AS COMPLEXING AGENT Deswati Deswati; Hamzar Suyani; Safni Safni
Indonesian Journal of Chemistry Vol 12, No 1 (2012)
Publisher : Universitas Gadjah Mada

A sensitive and selective absorptive stripping voltammetric (AdSV) method to determine Cd(II), Cu(II), Pb(II) and Zn(II) in sea water is proposed. The aim of this study was to get optimum condition for the determination of Cd(II), Cu(II), Pb(II) and Zn(II). Absorptive stripping voltammetry has been used for ultra trace determination of Cd(II), Cu(II), Pb(II) and Zn(II) using calcon as a complexing agent (ligand). In this case, the optimum conditions were reached at 0.1 M KCl supporting electrolyte, concentration of 0.5 mM calcon for Cd(II), Cu(II) 0.3 mM while 0.7 mM for Pb(II) and Zn(II), pH 6 for Cu(II) and pH 7 for Cd(II), Pb(II) and Zn(II), accumulation potential -0.5 V for Cu(II) and Pb(II) and -0.6 V for Cd(II) and Zn(II) and accumulation time 70 sec for Cd(II), 90 sec for Cu(II) and Pb (II) while 50 s for Zn(II). At the optimum condition the relative standard deviations were 7.80%, 4.25%, 8.70% and 0.86% for Cd(II), Cu(II), Pb(II) and Zn(II) respectively for eight replicates (n = 8) measurements of 10 μg/L Cd(II), Cu(II), Pb(II) and Zn(II). The method was applied for the direct determination of Cd(II), Cu(II), Pb(II) and Zn(II) in sea water around Bungus, Padang City. Concentration Cd(II), Cu(II), Pb(II) and Zn(II) in sample were 13.200 μg /L for Cd(II), 17.200 μg/L for Cu(II), 0.089 μg/L for Pb(II) and 62.000 μg/L for Zn(II) with recovery of 98.68%, 97.99%, 96.17% and 99.96% for Cd(II), Cu(II), Pb(II) and Zn(II), respectively.

Adsorpsi Cu2+ Menggunakan Nanofiber Polisulfon-FeOOH Yang Disintesis Dengan Metode Elektrospinning Dini Hariyati Adam; Hamzar Suyani; Muhamad Nasir; Safni Safni; Willy Cahya Nugraha
Jurnal Litbang Industri Vol 3, No 2 (2013)
Publisher : Institution for Industrial Research and Standardization of Industry - Padang

It had been done a research about adsorption of Cu2+ using polysulfone-FeOOH nanofiber prepared by elektrospinning method. Polysulfone-FeOOH nanofiber was synthesized by dissolving polysulfone pellets in 30 mL dimethylacetamide (DMAc). The effects of process conditions such as concentration, distance between the nozzle and collector, voltage and flow rate on the morphology and diameter of nanofibers were investigated. The optimum conditions of polysulfone nanofiber synthesizing was obtained with concentration 25%, distance 12 cm, voltage 25 kV, and flow rate 0.05 mL/min with average diameters of fibers was 762.927 nm. Polysulfone nanofiber was coated with FeOOH to increase the adsorbtion capacity of Cu2+. The results showed that optimum condition for removal of Cu2+ used polysulfone-FeOOH nanofiber was obtained in 2 hours contact time, pH 6, adsorbent dosage 25 mg, and concentration of Cu2+ 10 mg/L with adsorbstion capacity was 9.79 mg/g, while for polysulfone nanofiber the adsorption capacity was 8.34 mg/g. The adsorbtion pattern of Cu2+ by the both of adsorbent followed the Freundlich isotherm pattern.ABSTRAK Penelitian mengenai pemisahan ion Cu2+menggunakan nanofiber polisulfon-FeOOH yang disintesis dengan metode elektrospinning telah dilakukan. Nanofiber polisulfon P-3500 disintesis dengan cara melarutkan pelet polisulfon ke dalam 30 mL dimethylacetamide (DMAc). Pengaruh kondisi seperti konsentrasi, jarak nozzle dengan kolektor, tegangan dan laju alir terhadap morfologi dan diameter serat dipelajari. Kondisi optimum pembuatan nanofiber polisulfon diperoleh dengan konsentrasi 23 %, jarak 12 cm, tegangan 25 kV, dan laju alir 0,05 mL/min dengan ukuran diameter serat rata-rata 762,927 nm. Nanofiber yang terbentuk dilapisi dengan FeOOH untuk meningkatkan kapasitas penyerapannya terhadap ion Cu2+. Dari hasil penelitian didapatkan kondisi optimum untuk pemisahan ion Cu2+ menggunakan nanofiber polisulfon-FeOOH yaitu waktu kontak 2 jam, pH 6, bobot adsorben 25 mg, dan konsentrasi Cu2+10 mg/L dengan kapasitas penyerapan 9,79 mg/g, sedangkan untuk nanofiber polisulfon kapasitas penyerapan 8,34 mg/g. Pola penyerapan Cu2+ untuk kedua jenis adsorben lebih sesuai dengan pola isoterm Freundlich

Title

Found 47 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 47 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 47 Documents
Search