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INDONESIA
VALENSI
Published by Universitas Islam Negeri Syarif Hidayatullah Jakarta
ISSN : 24606065     EISSN : 25483013     DOI : 10.15408/jkv
Core Subject : Science,
Chemistry
Jurnal Kimia Valensi is a biannual and peer-reviewed open access journal published by Department of Chemistry, Faculty of Science and Technology UIN Syarif Hidayatullah Jakarta. This journal covering all aspect of chemistry.
Arjuna Subject : Umum - Umum
Articles 256 Documents
 1   2   3   4   5 
Uji Aktivitas Senyawa Antioksidan dari Ekstrak Metanol Kulit Pisang Raja (Musa paradisiaca Sapientum) Pane, Elfira Rosa
Jurnal Kimia Valensi Jurnal Valensi Volume 3, No.2, November 2013
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Syarif Hidayatullah State Islamic Uni

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v3i2.502

Abstract

AbstrakTelah dilakukan penelitian uji aktivitas senyawa antioksidan dari ekstrak metanol kulit pisang raja (Musa paradisiaca Sapientum). Ekstraksi dilakukan dengan cara maserasi menggunakan pelarut metanol. Ekstraksi bertingkat dilakukan terhadap ekstrak metanol dengan n-heksan dan etil asetat. Dari uji fitokimia terhadap fraksi metanol menunjukkan positif flavonoid. Pengujian aktifitas antioksidan dilakukan dengan reaksi oksidasi asam linoleat dengan metoda feritiosianat (FTC) 0,05%. Sebagai standar antioksidan digunakan Butil hidroksianisol (BHA). Hasil penelitian ini menunjukkan ekstrak metanol, fraksi n-heksan dan etil asetat memiliki aktifitas antioksidan yang tidak jauh berbeda dengan BHA. Sedangkan fraksi etil asetat memiliki aktifitas antioksidan yang lebih tinggi daripada BHA.Kata kunci : antioksidan, feritiosianat, Musa paradisiaca SapientumAbstractA research has been done to evaluate the antioxidant activity of metanol extract Musa paradisiaca Sapientum peel’s. Maseration technique was used to get the extract using metanol as solvent. The metanol extract of the peel was re-extracted by solvents into n-hexan and ethyl acetate fractions. Phytochemical screening of metanol extract showed positive flavonoid. The antioxidant activities were tested by using ferric thiocyanate method 0,05% (FTC) on linoleic acid and buthyl hydroxyanisole (BHA) as antioxidant standard. Metanol extract, n-hexan and ethyl acetate fraction exhibited antioxidative activity that was not significantly different from BHA, on the other hand, the ethyl acetate fraction exhibited significant antioxidative activity, which is better than BHA.Keywords : antioxidant, ferric thiocyanate, Musa paradisiaca Sapientum
LEACHING OF IRON AND ZINC INTO FOOD SIMULTANT FROM TIN CAN PACKAGING Sulistiawaty, Lilis; Solihat, Imas; Putra, Arie Pratama
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 5, No. 2, November 2019
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Syarif Hidayatullah State Islamic Uni

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (843.927 KB) | DOI: 10.15408/jkv.v5i2.12526

Abstract

Cans are widely used as primary packaging in various food products. Ferrous (Fe) and zinc (Zn) metal as the constituent components in the manufacture of can packaging bodies can experience corrosion and dissolve in food so that it will affect food quality and finally affect to health. This study aimed to determine the content of Fe and Zn metal at different treatments (time) with 3% acetic acid and vegetable oil as food simulators on can packaging using Atomic Absorption Spectrophotometer (AAS). The results of the analysis showed that the range of Fe and Zn metal content in 3% acetic acid food simulants were respectively 0.15-27.46 mg/kg and 0.00060.007 mg/kg, while in vegetable oil simulants 3% Fe and metal content Zn were 0.6-2.46 mg/kg and 0.00040.0025 mg/kg with 80-100% recovery, respectively. Thus, food from can packaging should not be exposed to oxygen for a long time, especially when it has been opened because it will increase the leaching of Fe and Zn metals from the packaging into food.
SPESIFITAS DAN SENSITIFITAS ANTIBODI ANTI ERF3 RAGI SACCHAROMYCES CEREVISIA Hermanto, Sandra
Jurnal Kimia Valensi Jurnal Valensi VOLUME 1, NO.1, NOVEMBER 2007
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Syarif Hidayatullah State Islamic Uni

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (798.24 KB) | DOI: 10.15408/jkv.v1i1.211

Abstract

Protein eRF3 (eukaryotic release factor-3) merupakan salah satu protein yang berperan padaproses terminasi translasi. Protein ini bersama-sama dengan eRF1 (eukaryotic release factor-1) saling berinteraksi membentuk kompleks release factor dalam memediasi pelepasan rantaipolipeptida dari ribosom. Untuk memahami mekanisme terminasi translasi dalam sistemeukariot telah dilakukan studi struktur fungsi eRF1 yang dilanjutkan dengan studi interaksi invitro eRF1 mutan dan eRF1 wild type dengan eRF3. Namun demikian, hasil deteksi dari studiinteraksi in vitro sulit terdeteksi secara kuantitatif. Untuk dapat mengkuantisasi pita-pitaeRF3 hasil studi interaksi in vitro diperlukan antibodi anti eRF3. Konstruksi antibodi antieRF3 telah dilakukan, tetapi antibodi ini belum terkarakterisasi dengan baik. Tahapanselanjutnya dilakukan analisa Western blot dengan cara mengukur tingkat spesifitas dansensitifitas antibodi anti eRF3 terhadap protein eRF3. Spesifitas antibodi ditentukanberdasarkan kemampuan antibodi ini dalam mengenali epitop protein eRF3 dari berbagaiprotein yang terdapat pada crude extract ragi, sedangkan sensitifitasnya ditentukan melaluivariasi jumlah antigen (eRF3) yang berinteraksi dengan antibodi tersebut. Hasil analisaWestern blot menunjukkan spesifitas antibodi anti eRF3 masih relatif baik dimana antibodiini mampu mengenali epitop protein eRF3 yang ditandai dengan munculnya pita tunggal(76,6 kDa) setelah antibodi ini direaksikan dengan crude extract ragi yang mengandungprotein eRF3. Sensitifitas antibodi ini juga relatif tinggi, karena antibodi ini mampumendeteksi protein eRF3 hingga jumlah yang relatif rendah (0,77 ng). Namun demikianantibodi ini belum cukup mampu mendeteksi protein eRF3 yang secara alamiah terdapat padacrude extract ragi. Hal ini kemungkinan besar disebabkan karena level ekspresi eRF3 dalamsel ragi yang relatif rendah jika dibandingkan dengan protein ribosom.
SINTESIS TRIS(4-METOKSIFENIL)TOLILSILAN DENGAN TEKNIK REAKSI KOPLING MENGGUNAKAN KATALIS PALADIUM TERSIER TRIBUTIL FOSFIN Lesbani, Aldes; Mohadi, Risfidian; Eliza, Eliza
Jurnal Kimia Valensi Jurnal Valensi Volume 3, No.1, Mei 2013
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Syarif Hidayatullah State Islamic Uni

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (272.857 KB) | DOI: 10.15408/jkv.v3i1.332

Abstract

Telah disintesis senyawa tris(4-metoksifenil)tolilsilan (TMT) dengan teknik reaksi kopling menggunakan tolilsilan dan 4-iodida anisol yang dikatalis senyawa paladium. Reaksi dilakukan dalam kondisi inert dan suasana basa. Senyawa TMT hasil sintesis dikarakterisasi menggunakan kromatografi gas-spektrometri massa dan spektrometer 1H dan 13C NMR. Hasil penelitian menunjukkan bahwa senyawa TMT hasil sintesis memiliki rendemen sebesar 30%. Pengukuran menggunakan kromatografi gas-spektrometri massa menghasilkan nilai m/z sebesar 440. Spektrum 1H NMR menunjukkan lima puncak proton ekivalen dan spektrum 13C NMR menghasilkan sepuluh puncak karbon ekivalen. Hasil karakterisasi tersebut bersesuaian dengan struktur senyawa TMT hasil sintesis.   Kata kunci: tris(4-metoksifenil)tolilsilan, reaksi kopling, paladium
PEMANFAATAN KULIT KACANG TANAH (ARACHIS HIPOGAEA L.) SEBAGAI ADSORBEN ZAT WARNA METILEN BIRU Nurhasni, M.Si, Nurhasni; Mar'af, Reski; Hendrawati, Hendrawati
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 4, No. 2, November 2018
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Syarif Hidayatullah State Islamic Uni

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1349.499 KB) | DOI: 10.15408/jkv.v4i2.8895

Abstract

Dye waste is a major problem in controlling environmental impacts. Dyestuff waste is an organic compound that is difficult to decompose, resistant, and toxic. If the waste is discharged into the water, it will cause environmental pollution. Research on the absorption of dyestuff of methylene blue by activated peanut shells has been carried out. The purpose of this study was to determine the adsorption efficiency, adsorption capacity, optimum conditions of dye adsorption including variation of contact time, adsorbent concentration, pH, and dye concentration. Adsorption test is carried out by batch method using a shaker. The adsorbent was then analyzed using FT-IR and SEM instruments. The results showed that, after activating the adsorbent had a better character than before activated. Peanut skin that has been activated with optimum NaOH against methylene blue, optimum conditions for adsorption of methylene blue dyestuff with 60 minutes contact time with alkaline activation adsorbent, optimum adsorbent concentration 1%, 50 ppm dye concentration, adsorbent size <180 ?m, pH 9 The adsorption isotherm pattern follows the Freundlich isotherm.  
PENGGUNAAN H-ZEOLIT DAN TAWAS DALAM PEMURNIAN CRUDE GLYCEROL DENGAN PROSES ADSORPSI DAN KOAGULASI Aziz, Isalmi; Fadhilah, Nur Hijjah Bayani; Hendrawati, Hendrawati
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 3, No. 1, Mei 2017
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Syarif Hidayatullah State Islamic Uni

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (568.018 KB) | DOI: 10.15408/jkv.v3i1.5143

Abstract

Production of biodiesel from used cooking oil byproducts such as crude glycerol with low purity. The crude glycerol containing compounds impurities such as free fatty acids, alcohol, soap, catalyst and water. Compound adsorption of impurities can be done with the H-zeolite as adsorbent, but the resulting quality is still not good. To improve its quality, this research was added alum (coagulation) process so that the adsorption of colloidal-sized compound impurities which can be separated from the glycerol. The purpose of this research is determine optimal condition of adsorption and coagulation impurity compounds of crude glycerol by using H-zeolite and  alum and  also determine quality of glycerol  was obtained. First, crude glycerol acidified by phosphoric acid 85% (pure analysis) until desired pH ±2.5. It was obtained purity of glycerol 72.797%. The next process is adsorption with activated H-zeolite and it obtained purity of glycerol 77.079%. The last process in this research is adsorption and coagulation by using H-zeolite and alum. The highest purity glycerol 93.803% was obtained from condition of adsorption and coagulation for 75 minutes; alum?s concentration 80 ppm; and temperature 60 ºC. The glycerol discharged from adsorption and coagulation process by using H-zeolite and alum is qualify Indonesia National Standard number 06-1564-1995 with 3.512% water content; 2.438% ash content; 0.247% MONG content; has no sugar; 1.259 g/mL density of glycerol; 0.2356% potassium content and 0.0410% aluminium content; and brighter color.DOI: http://dx.doi.org/10.15408/jkv.v0i0.5143
PRODUCTION OF CERAMIC MEMBRANE BASED ON ACID- AND ALKALI-ACTIVATED METAKAOLINITE AS COOLING MATERIAL FOR MONOCRYSTALLINE SILICON SOLAR CELL Septiani, Septiani; Ramadhy, Wahyu Febri; Islammiyati, Angie; Rahmalia, Winda
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 5, No. 2, November 2019
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Syarif Hidayatullah State Islamic Uni

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1091.109 KB) | DOI: 10.15408/jkv.v5i2.8562

Abstract

Ceramic membrane based on acid- and alkali-activated metakaolinite has been produced. It was tested as a cooling material for monocrystalline silicon solar cells. Membrane was made by several stages, such as calcination of natural kaolinite at 600 oC for 6 hours to obtain metakaolinite, activation of metakaolinite by concentrated HCl and KOH, and preparation of ceramic membrane. Kaolinite, metakaolinite, and activated metakaolinite were characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF), Fourier Transform Infra-red (FTIR), and gas sorption analyzer (GSA). Diffractogram of XRD showed that there was a structural change between activated metakaolinite and natural kaolinite. XRF analysis indicated that the Si/Al of HCl activated metakaolinite was three times higher than natural kaolinite. Activated metakaolinite was made into membrane by adding a binder, then heated at 800 °C for 6 hours. PV cells with and without cooling material were then analyzed their electrical performances. It was found that the maximum energy conversion yield of PV cells without using cooling material was 2.30%, while the maximum energy conversion yield of PV cells with cooling material of meta-kaolinite activated by HCl and KOH were respectively 2.72% and 2.94%.
ISOLASI DAN KARAKTERISASI SENYAWA α-AMIRIN DARI KULIT BATANG BINJAI (MANGIFERA CAESIA) Rosyidah, Kholifatu; Latifah, Nor; Astuti, Maria Dewi
Jurnal Kimia Valensi Jurnal Valensi Volume 2, No.2, Mei 2011
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Syarif Hidayatullah State Islamic Uni

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (212.161 KB) | DOI: 10.15408/jkv.v2i2.202

Abstract

Telah dilakukan isolasi dan karakterisasi senyawa ?-amirin dari kulit batang binjai (Mangiferacaesia). Hasil analisis spektra IR menunjukkan adanya gugus OH, C-H, C=C, dan gem dimetil.Spektra 1H-NMR dan 13C-NMR menunjukkan adanya 30 karbon, delapan diantaranya merupakanunit metil, dan satu ikatan rangkap. Struktur senyawa dikarakterisasi berdasarkan data spektroskopiIR dan NMR serta dibandingkan dengan data spektroskopi dari literatur. Berdasarkan data tersebut,senyawa hasil isolasi adalah ?-amirin.
EFEKTIVITAS PEMANFAATAN SERBUK GERGAJI DAN LIMBAH MEDIA TANAM JAMUR (BAGLOG) SEBAGAI BAHAN BAKU PEMBUATAN BIOGAS Mulyadi, Dikdik; Yuningsih, Lela Mukmilah; Kusumawati, Desi
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 2, No. 1, Mei 2016
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Syarif Hidayatullah State Islamic Uni

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (238.628 KB) | DOI: 10.15408/jkv.v2i1.3100

Abstract

Biogas is  one of energy   that can be produced by anaerobic fermentation of the organic compounds. The objective of this study was to determine the effectiveness of the utilization of waste of media  mushroom growth (baglog) with sawdust as raw material for biogas with  cow dung  activators. The study was conducted through anaerobic fermentation of the samples containing waste baglog (sample 1) and sawdust (sample 2), with the addition of cow manure activator to each sample. Both of these samples do anaerobic fermentation for 32 days, then measuring the volume of biogas every 4 days for 32 days. Methane content  in  samples 1 and 2 measured by  using gas chromatography. To see the effect of the addition of activators cow dung biogas volume measurement was  carried out with  cow dung without addition baglog waste and sawdust. The process of degradation baglog and sawdust with an activator of cow dung could be observed  in  some of the parameters through  total solids (TS), total volatile solids (TVS), volatile fatty acids (VFA), the degree of acidity (pH), and C/N ratio. The results showed that effectiveness of sample 1 resulted in the everage of total volume biogas 28% higher than  sample 2. The content of methane in  sample 1  and sampel 2  was 54% %, and 0.21% respectively. The fermentation process biogas production in this experiment  was carried out  at pH 7, with a value of TS, TVS and VFA showed a decrease  trend after the fermentation process,  C/N ratiowas  lower than the baglog waste sawdust until day 32 retention time. Keywords: Sawdust, baglog waste, biogas, fermentation, methane DOI : http://dx.doi.org/10.15408/jkv.v2i1.3100
SENYAWA 5,3'-DIHIDROKSI-7,4'-DIMETOKSIFLAVON DARI KULIT BATANG TANAMAN AKWAY (DRIMYS BECCARIANA GIBS) DAN AKTIVITAS ANTIMALARIANYA Rudiana, Tarso; Herlina, Tati; Julaeha, Euis
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 4, No. 2, November 2018
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Syarif Hidayatullah State Islamic Uni

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (602.007 KB) | DOI: 10.15408/jkv.v4i2.7775

Abstract

Akway (Drimys beccariana Gibs) is an endemic plant of Papua. Ethnobotany is used as a medicinal plant, one of which is used as a malaria drug. This study aims to isolate, determine the chemical structure and evaluate the antimalarial activity of D. beccariana stem bark. Powder of D. beccariana bark is macerated with methanol and fractionated using n-hexane and ethyl acetate. Ethyl acetate extract was fractionated using gradient liquid chromatography (KCV) (n-hexane: ethyl acetate: methanol). The KCV fraction was separated by repeated gravity column chromatography and preparative thin layer chromatography (TLC-P) to obtain Isolate 1. Isolate 1 was determined by spectroscopic methods including UV-Vis, IR, 1D NMR, and 2D. Isolate 1 is determined by its compound structure which is 5,3'-dihydroxy-7,4'-dimethoxyflavone. 5,3'-dihydroxy-7,4'-dimethoxyflavone compounds evaluated antimalarial activity against Plasmodium falciparum in vitro with antimalarial activity better than artemisinin.

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