cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
-
Contact Email
-
Phone
-
Journal Mail Official
-
Editorial Address
-
Location
Kota semarang,
Jawa tengah
INDONESIA
Chem Info
Published by Universitas Diponegoro
ISSN : -     EISSN : -     DOI : -
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry
CHEMINFO JOURNAL adalah jurnal saintifik yang diterbitkan secara periodik 3 bulanan oleh Jurusan Kimia, Fakultas Sains dan Matematika Universitas Diponegoro Semarang. Jurnal ini sebagai media publikasi hasil karya ilmiah lulusan S1 Jurusan Kimia.
Arjuna Subject : -
Articles 66 Documents
 2   3   4   5   6 
Effect of Milling Time on nanostructured Hydroxyapatite Results Synthesis by Precipitation Method Pratiwi, Sari; Windarti, Tri; Nurhasanah, Iis
Chem Info Journal Vol 1, No 2 (2013)
Publisher : Chem Info Journal

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

A study "Effect of Milling Time on Nanostructured Hydroxyapatite Synthesis Results by Precipitation Method" in purpose to know the effect of milling time on purity, phases and size of hydroxyapatite crystals synthesized. Hydroxyapatite (HA) were synthesized by the method of precipitation by adding dropwise a solution of CaCl2 to a solution of KH2PO 4 which has been conditioned at pH 9 with stirring and heated at 40 °C for 4 hours. The resulting suspension was allowed to stand for 20 hours. Product of precipitation milled using a Planetary Ball Mill at 880 rpm angular velocity and the ratio of powder/ballmill 1:10 with milling time variation 0, 5, 15, 30 and 60 minutes. Based on the FTIR and XRD, it was concluded that the HA produced by milling time of 60 minutes has not been able to achieve high purity. Another type of calcium phosphate formed on the product is calcium hydrogen phosphate anhydrous (CHPA). The longer the milling time, the smaller the size of HA crystals. Size of HA crystals are formed on the nanometer scale is 49.85 nm; 38.30 nm; 34.84 nm; 33.44 nm and 30.44 nm.
Isolasi, Identifikasi Dan Uji Antibakteri Senyawa Triterpenoid Dari Ekstrak n-Heksana Daun Tempuyung (Sonchus arvensis L.) Rumondang, Meutia
Chem Info Journal Vol 1, No 1 (2013)
Publisher : Chem Info Journal

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (520.865 KB)

Abstract

Isolation, identification, and antibactery test of triterpenoid compounds from n-hexane extract of tempuyung leaves (Sonchus arvensis L.) has been done. Maceration from 700 gram of dried leaves powder tempuyung with ethanol and then was partitioned by liquid-liquid extraction with n-hexane condensed n-hexane extracts was 4 gram. Phytochemical test result using Liebermann-Burchard showed that the n-hexane extract contained positive triterpenoid. Separation of n-hexane extract by column chromatography generated positive isolates of triterpenoid in E fraction and obtained triterpenoid isolates as 0.406 grams. Identification results of triterpenoid isolates from FT-IR spectrophotometer showed C=O ester, -CH3, -CH2, and C-O ester functional groups whereas identification results from GC-MS showed triterpenoid with molecular mass 552 g/mol and was suspected as pentacyclic triterpenoid ester. Antibactery test results showed MIC values of 50 ppm for ethanol extract, n-hexane extract, E fraction and triterpenoid isolates against E. coli and S.aureus.
METODE ELEKTROFOTOKATALISIS DAN FOTOKATALISIS DENGAN TiO2 PADA DEKOLORISASI REMAZOL GOLDEN YELLOW RNL DAN PENURUNAN KONSENTRASI ION LOGAM Cd2+ SECARA SIMULTAN N.R., Ade Novianti; , M.Si., Drs. Gunawan; Haris, M.Si., Drs. Abdul
Chem Info Journal Vol 1, No 2 (2013)
Publisher : Chem Info Journal

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Experiments on elektrofotokatalisis using TiO2 on decolorization remazol golden yellow RNL and decreased concentrations of Cd2+ metal ion simultaneously have performed. The purpose of this study was to compare the effectiveness of photocatalytic TiO2 in the form of thin layers of powder that was used to electrophotocatalyzed remazol golden yellow RNL and to reduce the concentration of metal ion of Cd2+. The electrophotokatalysis method use TiO2/FTO working electrode and photocatalytic TiO2 powder for 240 minutes. UV-Vis spectrophotometer was used to determine the absorbance decrease of remazol golden yellow RNL, while atomic absorption spectrophotometer (AAS) was used to determine the decrease concentration of metal ion Cd2+. The results obtained in this study for working electrode TiO2/FTO are more effective to decolorize remazol golden yellow RNL and to decrease the concentration of metal ion Cd2+ compared to the use of TiO2 powder. Electrophotokatalysis using TiO2/FTO working electrode was capable to decolorize remazol golden yellow RNL by 87.9% and to lower the concentration of metal ion of Cd2+ by 82.7%, while the photocatalytic method was only able to decolirize remazol golden yellow RNL by 25.87% and to decrease the concentration of metal ion Cd2+ amounted to 53.2%   
ISOLASI, PURIFIKASI DAN KARAKTERISASI α-AMILASE DARI Trichoderma viride FNCC 6013 Atmaja, Dwi Surya
Chem Info Journal Vol 1, No 1 (2013)
Publisher : Chem Info Journal

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (276.33 KB)

Abstract

Isolation, purification and characterization of α-amylase from Tichoderma viride FNCC 6013 were doing to get an α-amylase from Tichoderma viride FNCC 6013, to get value of specific activity before and after purification by gel filtration and to know the characteristic this enzyme like time incubation, pH and optimum temperature. Alpha amylase is amylolytic enzyme that hydrolysis soluble starch to produce simple sugar like maltose. Alpha amylase was isolated continued with first purification using ammonium sulphate and chromatograph gel filtration. The measured specific activity of α-amylase after purified by gel filtration show increased 381.91% more than before purified by gel filtration whereas specific activity before and after purification by gel filtration is 1.631 Unit/mg protein and 7.860 Unit/mg protein. The characteristic of α-amylase show that optimum time incubation is 28 minute, value of optimum pH is 4.7 and optimum temperature is 28 0C.
Sintesis dan Aplikasi Komposit ZnO-Karbon Aktif untuk Fotodegradasi Direct Blue 3R serta Fotoreduksi Ion Logam Pb2+ dan Cd2+ Secara Simultan Muchit, Moch Ali
Chem Info Journal Vol 1, No 1 (2013)
Publisher : Chem Info Journal

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1003.877 KB)

Abstract

Synthesis and aplication of ZnO-active carbon composite for direct blue 3R photodegradation and Pb2+ and Cd2+ ions photoreduction. Have been conducted for characterisation of synthesid by XRD obtained ZnO (wurzite) with crystal size 30,96-33,48 nm and by DR-UV resulted Eg = 3.8 eV. ZnO-activated carbon composite produced in gray colour tablet. Based on SEM and BET characterization, composite has a hollow morphology with a surface area of 27.209 m2/g, pore volume of 0.089 cc/g with a radius pores of 3.25 nm and has a high effectiveness in the dye direct blue 3R photodegradation of 95.37%. The optimum pH for photodegradation process is at pH 4 with the effectiveness of 91.92%. The addition of Pb2+ and Cd2+ ions can improve the effectiveness of direct blue 3R photodegradation and can reduce Pb2+ and Cd2+ ions simultaneosly with the optimum concentration of each metal were 12 ppm and 9 ppm. The addition of Pb2+ and Cd2+ ions produce the optimum concentration of 9 ppm and 12 ppm in photodegradation of Direct Blue 3R by 94.70% and 93.70% and can photoreduced Cd2+ and Pb2+ ions by 40.67% and 87.67%. The optimum time for photodegradation process was 4 hours.
Studi Interaksi Segmen Dimer Kitosan...Nikotinamida secara Komputasi Ab Initio dan Eksperimen Wibowo, Sapto Adi
Chem Info Journal Vol 1, No 1 (2013)
Publisher : Chem Info Journal

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (564.531 KB)

Abstract

The research has been done on theoritical study interaction between segment chitosan dimer and nicotinamide by ab initio computational dand experimental. The aims of this research is to determine interaction energy between segment chitosan dimer and nicotinamide in specific configuration by ab initio computational method and determine encapsulation efficiency nicotinamide with variation nicotinamide concentration to rasio (b/v) chitosan with acetic acid (1%) 20mg/20mL. The method that used is ab initio quantum mechanical calculations at theoritical level and basis sets RHF/6-31G (d, p) and experiment with centrifugation method. The result of calculation showed interaction energy between dimer chitosan segment…nicotinamide on first configuration has interaction energy -65,254 kJ/mol or - 15,596 kkal/mol and second configuration has interaction energy -57,061 kJ/mol or -13,63791 kkal/mol.   Encapsulation efficiency (EE) nicotinamide in range nicotinamide concentration variation 500 ppm – 2.500 ppm to rasio (b/v) chitosan with acetic acid (1%) 20mg/20mL average 46,83%. The difference of interaction energy between nicotinamide with the chitosan in configuration 1 and configuration 2 can explain the slow-release process of nicotinamide from the chitosan matrix. Interaction in configuration 2 easier released than configuration 1 at time release process.
Kitin Sebagai Bahan Dasar Drug Delivery: Studi Interaksi Molekul Kitin dengan Vitamin C secara Ab Initio (Chitin as Base Material of Drug Delivery: Study of Interaction Chitin Molecule with Vitamin C by Ab Initio) Satria, Army Putra
Chem Info Journal Vol 1, No 1 (2013)
Publisher : Chem Info Journal

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (754.965 KB)

Abstract

The research has been done on theoritical study interaction between chitin molecule and vitamin C by ab initio. The aims of this research is to determine interaction energy between segment chitin and vitamin C in specific configuration by ab initio. The method that used is ab initio quantum mechanical calculations at theoritical level and basis sets RHF/6-31G (d, p). The result of calculation showed interaction energy between dimer chitin segment…vitamin C on first configuration has interaction energy -89,299 kJ/mol or -21,343 kkal/mol and second configuration has interaction energy -49,381 kJ/mol or -11,802 kkal/mol. Configuring the more stable is the interaction between dimer chitin and vitamin C in configuration 1 because it had a greater interaction energy than configuration 2. This proved that the configuration of one more potential use as carriers in drug delivery.
ISOLASI BAKTERI SELULOLITIK TERMOFILIK KOMPOS PERTANIAN DESA BAYAT, KLATEN, JAWA TENGAH Alam, Moch Syaiful
Chem Info Journal Vol 1, No 1 (2013)
Publisher : Chem Info Journal

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (389.656 KB)

Abstract

Isolasi bakteri penghasil selulase termofil sangat penting untuk dilakukan, mengingat besarnya potensi selulase termofil pada industri. Salah satu sumber isolasi bakteri selulolitik termofilik alternatif yaitu kompos pertanian. Desa Bayat Klaten merupakan desa dengan potensi kompos yang besar dan belum dieksplorasi dengan maksimal. Penelitian bertujuan untuk mendapatkan isolat bakteri selulolitik termofilik dari kompos pertanian fase termofil. Bakteri selulolitik termofilik kompos diisolasi dari kompos pertanian dengan menggunakan metode pengenceran, streaking dan spreading pada media CMC (Carboxymethilcellulose). Isolat bakteri selulolitik yang tumbuh pada media CMC tentukan suhu optimum pertumbuhannya dengan parameter jumlah sel yang diukur dengan menggunakan metode OD 600. Penelitian ini menghasilkan isolat bakteri KB dan KK yang diisolasi dari kompos pertanian desa Bayat, Klaten Jawa Tengah, Isolat bakteri KB tumbuh sekdikt lebih optimal daripada isolat bakteri KK pada media CMC dengan suhu kultivasi optimum pada suhu 50 oC.
SINTESIS HIDROKSIAPATIT DARI BATU KAPUR ALAM SECARA MEKANOKIMIA DENGAN VARIASI WAKTU PENGGILINGAN Riqti, Frederica Thalita; Windarti, Tri; Sutanto, Heri
Chem Info Journal Vol 1, No 2 (2013)
Publisher : Chem Info Journal

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

A study entitled synthesis of hydroxyapatite from natural limestone with variations mechanochemical milling time. The purpose of this research was to produce hydroxyapatite and to determine the effect of milling time on the purity, phases, and crystallite size on the synthesis of hydroxyapatite from limestone with mechanochemical method. The principle of this method is that the reaction between solids with the help of mechanical energy. Limestone that has been mashed mixed with powdered KH2PO4, mechanochemical process is then performed with the variation of time 0, 70, 80, 90, and 100 minutes. The resulting products were analyzed with FTIR and XRD and calculated by Scherrer equation to determine the crystallite size. Based on XRD and FTIR result, dominant types of calcium phosphate produced in this research were hydroxyapatite (HA) and tetracalcium phosphate (TTCP). Crystallite size of HA was formed on the time variation of 70, 80, 90, and 100 minutes ie 40.66 nm, 39.03 nm, 36.84 nm, and 39.78 nm.
PENGARUH WAKTU HIDROTERMAL PADA SINTESIS ZEOLIT DARI ABU SEKAM PADI SERTA APLIKASINYA SEBAGAI BUILDER DETERJEN Sholichah, Fitriani
Chem Info Journal Vol 1, No 1 (2013)
Publisher : Chem Info Journal

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (198.51 KB)

Abstract

Has done research on use of concerning the effect of time on the hydrothermal synthesis of zeolite from rice husk ash and its application as a detergent builder. The purpose of this study was to determine the effect of time on the character of hydrothermal zeolite synthesis are the type of zeolite crystal size and cation exchange capacity, and determine the detergency of the surfactant sodium lauryl sulfate using zeolite synthesis as a builder and compared with sodium tripolyphosphate (STPP). The method used in this research is the synthesis of zeolites include the manufacture of rice husk, manufacturing of sodium silicate, and manufacturing of sodium aluminate zeolites with various hydrothermal time 3 hours, 4 hours, 5 hours, 6 hours, and 7 hours, results obtained later in the characterization by x-ray diffraction method to determine the size and type of zeolite crystals, to determine the identification of functional groups on the zeolite with FT-IR, to determine the ratio of Si / Al using atomic absorption spectroscopy and determine the cation exchange capacity. The results of the characterization of zeolite synthesis optimum time variation of hydrothermal 7 hours with the type of zeolite Na-A and sodalite, crystal size 0.404 μm, and the CEC value of 53.23 meq/100 grams. Synthesized zeolite was then used as a detergent builder and membandingakan with sodium tripolyphosphate (STPP). The process involves determining c.m.c surfactant detergency, manufacture and test a standard dirt detergency. Optimum detergency power the time variation of hydrothermal 7 hours of power by 93.76% and 70.47 detergency use of STPP

Page 4 of 7 | Total Record : 66

 2   3   4   5   6 

Filter by Year

2013 2015


Reset
Filter By Issues
All Issue Volume 3, Nomor 1, Tahun 2015 Vol 1, No 2 (2013) Volume 1, Nomor 1, Tahun 2013 Vol 1, No 1 (2013)