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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 425 Documents
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Analisis Sifat Fisika dan Kimia Lignin Tandan Kosong Kelapa Sawit asal Desa Sape, Kabupaten Sanggau, Kalimantan Barat Siti Suhartati; Rachmat Puspito; Fikri Rizali; Dian Anggraini
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 2, No. 1, Mei 2016
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v2i1.3102

Abstract

Analysis of the physical and chemical properties of palm empty fruit bunches (EFB) lignin from Sape village in Sanggau, West Borneo has been done. This research was aimed to find extract and isolate the EFB lignin, to determine density, and viscosity of black liquor containing EFB lignin and to find the purity, moisture content and ash content of isolated EFB lignin. Black liquor was extracted by using reflux process and the lignin was isolated by using organosolv process. The result showed that the density and viscosity of the black liquor was 0.9658 g/mL and 1.4565 Ns/m2, respectively. The isolated lignin isolated has purity about 64.64% with moisture content about 3.07% and the ash content about 30.34%. The data from this analysis became the basis of utilization of lignin TKKS in some lignin-based industries. Key words: Analysis of physical and chemical properties, lignin, EFB DOI: http://dx.doi.org/10.15408/jkv.v2i1.3102
Limbah Molas : Pemanfaatan sebagai Sumber Karbohidrat untuk Perkembangbiakan Mikroorganisme Endah Wulandari; Tami Idiyanti; Ernawati Sinaga
Jurnal Kimia Valensi Jurnal Valensi Volume 2, No.5, November 2012
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v2i5.299

Abstract

Limbah molas merupakan hasil samping dari pabrik gula yang tidak dapat dikristalkan kembali. Salah satu kandungan limbah molas yaitu kaya akan karbohidrat. Salah satu upaya untuk memanfaatkan limbah molas yaitu dengan melakukan penelitian terhadap nutrisi yang masih terkandung dalam molas masih dapat dimanfaatkan. Penelitian ini bertujuan untuk mengetahui kemampuan mikroorganisme dalam memanfaatkan karbohidrat (glukosa) yang terdapat dalam limbah molas untuk perkembangbiakan. Mikroorganisme yang digunakan adalah jenis ragi yaitu Candida utilis, Endomycopsis fibuligera dan Saccharomyces cerevisiae. Waktu pengamatan yang dilakukan adalah 0, 6, 12, 18, 24, 30 jam dengan suhu inkubasi 37oC. Pengamatan yang dilakukan meliputi : pengukuran berat biomassa dengan cara menimbang berat kering mikroorganisme, pengukuran konsentrasi glukosa limbah molas yang dimanfaatkan mikroorganisme dengan cara Somogyi-Nelson dan perhitungan tingkat efektifitas penggunaan molas terhadap pertkembangbiakan mikroorganisme. Hasil: Berat biomassa tertinggi dicapai oleh Saccharomyces cerevisiae dengan biomassa tertinggi 156,33 mg dalam waktu 18 jam. Konsentrasi glukosa yang dimanfaatkan oleh Endomycopsis fibuligera lebih tinggi dibandingkan dengan mikroorganisme yang lain, yaitu dalam waktu 30 jam mencapai 3,13 mg/mL dan kemungkinan dengan bertambahnya waktu inkubasi masih mampu memanfaatkan glukosa lebih banyak. Mikroorganisme yang memiliki tingkat efektifitas dalam memnfaatkan limbah molas sebagai sumber glukosa adalah Saccharomyces cerevisiae dengan tingkat efektifitas 126,4 mL/mg berat biomassa dalam waktu 12 jam. Kesimpulan :Saccharomyces cerevisiae yang terbaik dalam pemanfaatan glukosa dari limbah molas untuk pertumbuhan biomassa.
Sintesis Komposit TiO2-Bentonit dan Aplikasinya untuk Penurunan BOD dan COD Air Embung UNNES Navela Rahma Aji; Emas Agus Prastyo Wibowo; Resti Ujiningtyas; Hestin Wirasti; Nuni Widiarti
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 2, No. 2, November 2016
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v2i2.3620

Abstract

Abstrak Telah disintesis komposit TiO2-bentonit untuk penurunan BOD dan COD. Penelitian ini bertujuan untuk mengetahui proses pembentukan komposit TiO2-Bentonit serta mengetahui katalis terbaik dalam proses fotodegradasi air embung. Penelitian diawali dengan preparasi TiO2-Bentonit. Hasil pembentukan komposit dikarakterisasi dengan menggunakan X-Ray Diffraction (XRD), Fourier Transform Infrared (FTIR) dan Scanning Electron Microscope (SEM). Katalis yang diuji adalah TiO2, bentonit, TiO2-bentonit yang diaplikasikan ke air embung dengan waktu penyinaran selama 30 menit.Terbentuknya komposit TiO2-Bentonit ditunjukkan dengan refleksi TiO2 pada 2 25. Hasil analisis menggunakan FTIR yakni Ti-O antara range 400-700 cm -1 dalam hal ini ditunjukkan dalam peak 478.35 dan 594.08. Puncak serapan-serapan utama pada bentonit beradi di bilangan gelombang 3626.17 cm-1, 3448.72 cm-1 dan 1635.64 cm-1. Spektra TiO2-Bentonit tidak menunjukkan adanya pergeseran serapan pada bilangan gelombang 3448.72 cm-1 yang belum  menunjukkan ikatan O-H yang semakin lemah karena adanya TiO2 di dalam antar lapis bentonit.Penurunan nilai BOD dan COD terbesar diperoleh dengan menggunakan TiO2-Bentonit yakni untuk BOD 18.40 ppm dan COD 10.05ppm. Kemampuan komposit TiO2-Bentonit lebih besar dibandingkan katalis TiO2 dan bentonit.   Kata kunci: air embung, fotodegradasi, TiO2-bentonit Abstract   Have done synthesized composite TiO2-bentonite to decrease BOD and COD. This study aims to determine the process of form he composite TiO2-bentonite and determine the best catalyst in the process of photodegradation water reservoir. The study begins with the preparation of TiO2-bentonite. Results composite formation characterized using X-Ray Diffraction (XRD), Fourier Transform Infrared (FTIR) and Scanning Electron Microscopy (SEM). The catalyst is tested TiO2, bentonite, TiO2-bentonite which is applied to the water reservoir with the exposure time for 30 menit.Terbentuknya composite TiO2-bentonite indicated by TiO2 reflection on the 2θ ≥ 25. FTIR analysis results using the Ti-O between the range 400-700 cm-1 in this case is shown in peak 478.35 and 594.08. The main absorption peak-absorption on bentonite beradi at wavenumber 3626.17 cm-1, 3448.72 and 1635.64 cm-1. TiO2-bentonite spectra did not indicate any shift in absorption at wavenumber 3448.72 cm-1 which has not shown the OH bond is weakened by the existence of TiO2 in between layers of bentonite. Impairment The BOD and COD obtained using the TiO2-bentonite for BOD 18.40 ppm and 10.05 ppm COD. TiO2-bentonite composite capability greater than TiO2 catalyst and bentonite.   Keyword: air embung, photodegradation, TiO2-bentonite DOI: http://dx.doi.org/10.15408/jkv.v0i0.3620
Analisis Kadar Akrilamida Dalam Sediaan Roti Kering Secara KCKT Sandra Hermanto; Robiatul Adawiyah
Jurnal Kimia Valensi Jurnal Valensi Volume 2, No.1, November 2010
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v2i1.235

Abstract

Akrilamida merupakan zat yang berbahaya dan berpotensi menyebabkan kanker pada sekitar 2% kasus tiap tahun di dunia. Akrilamida biasanya ditemukan pada makanan yang diproses menggunakan suhu tinggi (di atas 150ºC), misalnya pada roti kering. Penetapan kandungan akrilamida dalam sediaan roti kering yang beredar di wilayah Jakarta Timur telah dilakukan dengan menggunakan Kromatografi Cair Kinerja Tinggi (KCKT). Preparasi sampel dilakukan dengan teknik ekstraksi menggunakan pelarut diklorometan dan etanol (1:15). Pengukuran kadar akrilamida dilakukan dengan kolom C18 (reverse phase) dengan detektor UV-Vis pada panjang gelombang 210 nm dengan fase gerak asam fosfat 85% dalam asetonitril:air (5:95), laju alir 0.5 ml/menit. Hasil analisis menunjukkan waktu retensi yang dibutuhkan untuk mengelusi akrilamida adalah 7.1 menit, dengan koefisien variasi 0.67% dan presisi sebesar 0,38%, 0,74% dan 0,21% serta uji perolehan kembali 98,18%. Pembuatan kurva kalibrasi pada rentang konsentrasi 0,1-1,6 μg/ml menghasilkan koefisien linieritas 0.999982 dan batas deteksi 0.0126 μg/ml serta batas kuantitasi 0.0420 μg/ml. Kadar akrilamida untuk ketiga sampel produk roti kering yaitu 0.0541 ± 0.0270 (sampel 1); 0.0851 ± 0.0629 (sampel 2); and 0.3445 ± 0.2539 μg/g (sampel 3). Kadar akrilamida pada masing-masing sampel masih berada di bawah ambang batas standar yang dikeluarkan FDA.
Penggunaan Parameter Geokimia Isoprenoid untuk Menentukan Tingkat Kematangan Minyak Bumi (Crude Oil) Sumur Minyak Langgak Riau Emrizal Mahidin Tamboesai
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 1, No. 2, November 2015
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v0i0.3142

Abstract

In this study, crude oil samples from Distric Langgak, Riau were tested and characterized with isoprenoid parameters. Determination of thermal maturity level aims to determine the feasibility of petroleum wells to be exploited because there are many new wells of petroleum unexploited in the Riau area. Determination of maturity crude oil performed by analysis saturated fractions. Saturated fraction of the wells Langgak used to determine the maturity of crude oil based on parameters isoprenoid, n-alkane and carbon preference index were analyzed using gas chromatography-flame ionize detector (GC-FID). Based on the value Pr / Ph, Pr / n-C17, Ph / n-C18 and its CPI, the maturity level of petroleum from oil wells, Langgak levels of maturity and quality of the oil is indicated by the value of Pr / Ph (2.27), the value of Pr / n-C17 (0.57), the value of Ph / n-C18 (0.22) and the CPI (1.087) respectively.DOI :http://dx.doi.org/10.15408/jkv.v0i0.3142
Microencapsulation of Lime Peel Essential Oils (Citrus aurantifolia) with Complex Coacervation Methods using Gelatin/Sodium Alginate Coating Sandra Puspita; Diana Rakhmawaty Eddy; Tatang Wahyudi; Euis Julaeha
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 6, No. 1, May 2020
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v6i1.14618

Abstract

Lime (Citrus aurantifolia) peel essential oils are complex metabolites mainly used as natural preservatives. The principal constituents include d-limonene, β-pinene, and terpineol. Moreover, essential oils (EOs) are potentially known volatile and unstable compounds, hence, they require proper packaging techniques, e.g., microencapsulation. The purpose of this study is to evaluate the binary methods of lime peel essential oils microencapsulation using complex coacervation. This involves the application of gelatin and sodium alginate coatings under two specific conditions, termed core/coating ratio 1:1.2, with modified stirring and core/coating ratio 1:2.0, with stirring speed of 600 rpm, respectively. The results showed the EOs preparation generated 0.70% yield characterized by good quality, fresh aroma, and pale-yellow coloration. Also, microcapsules delivered 37.06% yield, 39.18% oil content, 31.53% encapsulation efficiency (EE), and less smooth-edged SEM surface under condition I. Meanwhile, condition II demonstrated 51.46% yield, 58.66% oil content, 92.04% encapsulation efficiency (EE), and flat-curved, SEM surface. Furthermore, it was carefully observed condition II produced more superior microcapsules
Uji Aktivitas Senyawa Antioksidan dari Ekstrak Metanol Kulit Pisang Raja (Musa paradisiaca Sapientum) Elfira Rosa Pane
Jurnal Kimia Valensi Jurnal Valensi Volume 3, No.2, November 2013
Publisher : Syarif Hidayatullah State Islamic University

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
Antioxidant Activity From Water Extract Of Kecombrang Flower (Etlingera elatior) Leading To Jelly Candy Formulation Dede Sukandar; Nani Radiastuti; Anna Muawanah; Adeng Hudaya
Jurnal Kimia Valensi Jurnal Valensi Volume 2, No.2, Mei 2011
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v2i2.203

Abstract

A research on antioxidant activity of kecombrang flower ( Etlingera Elatior) water extract leading tojelly candy formulation was conducted. This experiment aims to elucidate the potential usage ofkecombrang flower as a functional food ingredient. Antioxidant activity of the kecombrang flowerwater extract was determined using Diphenyl Picryl Hidrazyl ( DPPH) method. In order to elucidatethe responsible compound for antioxidant activity, GCMS analysis was undertaken. Water extract ofkecombrang flower have antioxidant activity ( IC50=61,6497 ppm) and based on GCMS analysis itcontained 1-dodekanol ( tR=11,60, area=11,73, similarity at 95 %), 3-metil-1-oxo-2-buten 1-(21,41,51-trihidroxyl phenil) ( tR=13,02, area=3,17, similarity at 57 %) and 1-tetradecene ( tR= 13,26,area=6,03, similarity at 98 %). Formulation of jelly candy using kecombrang flower was designedand based on organoleptic test, C formula ( pink, sample code 763) was the optimum jelly pepermintformula with average score of 3,52.
Pembuatan Biodiesel dengan Cara Adsorpsi dan Transesterifikasi Dari Minyak Goreng Bekas Lisa Adhani; Isalmi Aziz; Siti Nurbayti; Christie Adi Octavia
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 2, No. 1, Mei 2016
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v2i1.3107

Abstract

Used cooking oil can be used as raw material for biodiesel, but the levels of free fatty acids (Free Fatty Acid, FFA) is quite high. It is necessary for pretreatment in the form of the adsorption process to reduce levels of FFA. This study aims to determine the optimal conditions of adsorption process and determine the quality of biodiesel produced from adsorption processes and transesterification. Natural zeolites are used as adsorbents activated beforehand using ammonium chloride, calcined and heated to obtain H-zeolite. Furthermore, the adsorption process optimization includes the time, the adsorbent concentration, temperature and particle size. The oil that is already in the adsorption catalyst is reacted with methanol and KOH to obtain biodiesel. The optimum adsorption conditions obtained at the time of 90 minutes, the concentration of H-zeolite 12%, temperature 90 ° C, and a particle size of 0.2 mm that can lower FFA levels from 3.2% to 1.1%. Biodiesel produced meets the quality requirements of SNI 04-7182-2006 with a water content of 0.02%, a density of 857.60 kg / m3, the acid value of 0.29 mg-KOH / g, iodine number 15.71, saponification 168 , 02 and cetane index of 75.62. Compounds contained in biodiesel are methyl 9-octadecanoic (49.45%), methyl heksadekanoat (20.79%), and methyl 9,12oktaekanoat 9.12 (18.87%). Keywords: Biodiesel, used cooking oil, adsorption, transesterification, H-zeolitDOI: http://dx.doi.org/10.15408/jkv.v2i1.3107
Minuman Pandan Wangi (Pandanus amaryllifolius Roxb) sebagai Minuman Sehat Sri Yadial Chalid; Zulfakar TS
Jurnal Kimia Valensi Jurnal Valensi Volume 1, No.5, November 2009
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v1i5.303

Abstract

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