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Jurnal Riset Kimia
Published by Universitas Andalas
ISSN : 1978628X     EISSN : 24768960     DOI : -
Core Subject : Science,
Chemistry
Arjuna Subject : -
Articles 6 Documents
 1 
Search results for , issue "Vol 9, No 2 (2016): March" : 6 Documents clear
ANALISIS ZAT WARNA TARTRAZIN PADA JAJANAN MINUMAN RINGAN TAK BERLABEL YANG DIJUAL PEDAGANG KAKI LIMA DI BANDA ACEH Bhernama, Bhayu Gita
Jurnal Riset Kimia Vol 9, No 2 (2016): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v9i2.241

Abstract

Analisis zat warna Tartrazin pada jajanan minuman ringan tak berlabel yang dijual pedagang kaki lima di Banda aceh telah dilakukan. Zat warna Tartrazin merupakan pewarna sintetis yang digunakan oleh masyarakat sebagai bahan tambah pangan (BTP), guna meningkatkan daya tarik minuman. Analisis zat warna Tartrazin pada jajanan minuman ringan tak berlabel yang dijual pedagang kaki lima di Banda aceh bertujuan untuk mengetahui ada atau tidaknya kandungan zat warna Tartrazin dan menentukan kadar zat warna Tartrazin yang terdapat pada jajanan minuman ringan tak berlabel yang dijual pedagang kaki lima. Hasil analisis didapatkan kadar zar warna Tartrazin pada panjang gelombang 427 nm sekitar 1,06457- 40,6126 ppm. Kadar zat warna Tartrazin melebihi batas yang telah ditetapkan berdasarkan ADI (Acceptable Daily Intake) yaitu sekitar 7,5 mg/Kg/day. KBPOM RI No. 37 Tahun 2013 tentang batas maksimum penggunaan BTP pewarna ditetapkan bahwa pewarna Tartrazin yang diizinkan 70  mg/Kg
SINTESIS LAPISAN TIPIS TiO2 BERPORI YANG DIMODIFIKASI OLEH NITROGEN DENGAN METODE PEROKSO SOL-GEL, KARAKTERISASI DAN APLIKASINYA SEBAGAI MATERIAL PEMBERSIH DIRI (SELF CLEANING MATERIAL) Wellia, Diana Vanda
Jurnal Riset Kimia Vol 9, No 2 (2016): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v9i2.286

Abstract

The photocatalytic properties of TiO2 compound in anatase phase can be activated under visible light by nitrogen modification and its ability can be increased by generated porous structure using polietilen glikol (PEG) on TiO2 thin film surface. The porous N/TiO2 thin films were prepared by heating aqueous peroxotitanate thin films by addition of polietilen glikol (PEG) deposited uniformly on superhydrophilic uncoated glass at 500 oC for 1 h. The result of X-ray diffraction (XRD) confirmed the resence of only anatase phase for all samples. The UV-Vis spectroscopy showed the synthesized porous N/TiO2 thin films exhibit the absorption in the visible range (400-500 nm). Photocatalytic activity of porous N/ TiO2 thin films were evaluated by using fourier transform-infrared spectroscopy (FTIR) to determine the ability of this photocatalyst for stearic acid degradation under visible light irradiation. The result showed that N/TiO2/PEG-2.1 thin film degraded the stearic acid was about 87,86%, which was 1,12 times higher than that of N-doped TiO2 and 9,9 times higher than that of undoped TiO2 thin film.
PREPARASI DAN MODIFIKASI KIMIA STRUKTUR KITOOLIGOSAKARIDA-2,5-ANHIDRO-D-MANNOFURANOSA (KOSAMF) DARI KITOSAN SERTA UJI ANTIBAKTERI TERHADAP Staphylococcus aureus DAN Escherichia coli Salim, Emil; -, Hasnirwan; Ibrahim, Sanusi; -, Afrizal
Jurnal Riset Kimia Vol 9, No 2 (2016): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v9i2.279

Abstract

Kitooligosakarida-2,5-anhidro-D-mannofuranosa (KOSamf) dipersiapkan dengan derajat polimerisasi tertentu melalui reaksi nitrous deaminasi dari kitosan parsial N-deasetilasi. KOSamf kemudian diubah menjadi turunan KOSamf dengan mengkopling gugus aldehid yang terdapat pada unit 2,5-anhidro-D-mannofuranosa (amf). KOSamf dengan 3,5-dikloroanilin dan NaBH3CN dalam pelarut buffer ammonium asetat direaksikan melalui metoda one-pot aminasi reduktif untuk menghasilkan turunan KOSamf yang berpotensi sebagai senyawa antibakteri dan antijamur. Struktur kimia dari turunan KOSamf yang telah disintesis dikarakterisasi dengan Spektroskopi FT-IR dan NMR. Senyawa turunan KOSamf memiliki aktivitas sebagai antibakteri terhadap bakteri Staphylococcus aureus dengan zona inhibisi 12,5 mm dan bakteri E. coli dengan zona inhibisi 10,5 mm.
EKSTRAKSI DAN IDENTIFIKASI SENYAWA ANTOSIANIN DARI JANTUNG PISANG RAJA (Musa x paradisica L.) SERTA UJI AKTIVITAS ANTIOKSIDANNYA Alvionita, Jessica; Darwis, Djaswir; Efdi, Mai
Jurnal Riset Kimia Vol 9, No 2 (2016): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v9i2.284

Abstract

Anthocyanin coumpound have been successfully extracted from plantain bud (Musa x paradisiaca L) which can used as natural colorant and antioxidant. Coumpound anthocyanin exracted using maceration method with solvent ethanol that has been acidified with acetic acid and citric acid until pH 1,5. The extract anthocyanin is identified by UV-Vis spectrophotometer (260-800 nm) and retrieved two peaks that is 277 nm (UV) and 533 nm (Visible). Further treatment is carried out with KCKT-DAD at a wavelength 516 nm. Anthocyanin treatment given temperature and pH. Total anthocyanin monomeric obtained for ethanol + acetic acid was 30,22 mg/L; ethanol + citric acid was 18,20 mg/L. The warming influence of the anthocyanin compound lead to degradation of color is highest for ethanol + acetic citric on temperature 100oC with percentage degradation of 61,97 %. The antioxidant activity of the extract was measured by 1,1- difenil-2-pikrilhidrazil (DPPH) the result showed that the anthocyanin extracts from Plantain bud has antioxidant activity ethanol + acetic citric acid extract is very active as an antioxidant with IC50  values of 3,74 mg/L.
ISOLASI DAN KARAKTERISASI METABOLIT SEKUNDER DARI EKSTRAK ASETON DAUN MACARANGA PRUINOSA BANGKA BELITUNG Roanisca, Occa; Syah, Yana M.
Jurnal Riset Kimia Vol 9, No 2 (2016): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v9i2.248

Abstract

Macaranga is a large genus in Euphorbiaceae, locally known as "Mahang-mahangan", and consisting about 300 species. Distribution of Macaranga is widespread from Africa and Madagascar in the west to the tropical regions of Asia including Indonesia. Based on previous research of the M. pruinosa, secondary metabolites that have been reported are flavonoid, and stilbenoid derivatives from Borneo. M. pruinosa that grow in South Sumatra produce poilanoat acid (diterpene). Therefore, this research is done to investigate phytochemical constituent of leaves of M. pruinosa from Bangka Belitung Islands. Isolation is done by maceration in acetone, separation and purification using vacuum liquid chromatography and radial chromatography. Structure determination were elucidated by 1H-NMR,13C-NMR, 2D NMR. Two compounds are identified as flavanon derivatives. They are nymphaeol B, and 6-farnesil-3',4',5,7-tetrahidroksiflavanon. These compounds are substituted with terphenyl group, known as geranyl (C10), and farnesyl (C15). Nymphaeol B (1) and compound of 6-farnesil-3', 4', 5,7-tetrahidroksiflavanon (2) have been found in other species of Macaranga. In conclusion, we here acquired two phenolic derivatives substituted by terphenyl groups from acetone extracts of leaves of M. pruinosa from Bangka Belitung. They are nymphaeol B, and 6-farnesil-3',4',5,7-tetrahidroksiflavanon. The result showed that M.pruinosa can produce different secondary metabolites depend on where they grow. 
PROSES ULTRAFILTRASI UNTUK PENJERNIHAN SARI BUAH MARKISA (Passiflora quadrangularis) DENGAN MEMANFAATKAN MEMBRAN KERAMIK -, Refinel; Tetra, Olly Norita; Usmita, Roza Melia
Jurnal Riset Kimia Vol 9, No 2 (2016): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v9i2.285

Abstract

Ultrafiltration of passion fruit juice using variation thickness of ceramic membrane has been done.  The result shows that aquades flux value in 25 minutes for membrane 1.5; 2.0; 2.5; 3.0; and 3.5 mm is 17.0135; 19.1947; 10.9061; 10.9061 and 4.3624 L/h m2. Whereas passion fruit juice in same time for membrane 1.5; 2.0; 2.5 mm is 8.2886; 5.6712 and 4.3624 L/h m2. For membrane 3.0 and 3.5 mm it has not been done because flux value are too small that indicate fouling. Physical and chemical properties parameter in ultrafiltration of passion fruit juice obtained for turbidity and color very different between passion fruit juice before and after ultrafiltration, whereas reducing sugar and vitamin C are not significant different between passion fruit juice before and after ultrafiltration. Determination rejection coefficient value of membrane for turbidity, color  relatively significant whereas for reducing sugar and vitamin C are relatively not significant.

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