Dwi Kartika
Program Studi Kimia, Jurusan MIPA Fakultas Sains dan Teknik, Universitas Jenderal Soedirman, Purwokerto

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SINTESIS DAN KARAKTERISASI KARBOKSIMETIL KITOSAN Kurniasih, Mardiyah; Kartika, Dwi; , Riyanti
Prosiding Vol 3, No 1 (2012)
Publisher : Prosiding

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Abstract

Karboksimetil kitosan merupakan derivate dari kitosan yang diperoleh melalui proses eterifikasi alkalis kitosan dengan asam monokloroasetat. Kitosan diperoleh dari deasetilasi kitin dalam kulit udang putih (Penaeus vannamei). Keberadaan kitin dalam kulit udang tidak dalam keadaan bebas, akan tetapi berikatan dengan protein, mineral, dan berbagai macam pigmen (zat warna). Tujuan penelitian ini adalah untuk mensintesis dan mengkarakterisasi karboksimetil kitosan. Berdasarkan hasil penelitian diperoleh kitosan sebanyak 17,33% (per berat serbuk kulit udang) dan karboksimetil kitosan sebanyak 42% (per berat kitosan). Spektum IR karboksimetil kitosan menunjukan melebarnya serapan dari vibrasi ulur gugus -OH yang tumpang tindih dengan serapan vibrasi ulur –NH serta semakin tajamnya intensitas serapan pita ulur C=O dan vibrasi ulur C-O. Kadar air dari kitosan hasil sintesis sebesar 2,13% sedangkan karboksimetil kitosan sebesar 11,86%. Kadar abu kitosan hasil sintesis sebesar 0,73%, sedangkan kadar abu karboksimetil kitosan sebesar 0,93%. Swelling untuk kitosan hasil sintesis sebesar 163,13% sedangkan untuk karboksimetil kitosan sebesar 182,98 %.
Konsentrasi Katalis dan Suhu Optimum pada Reaksi Esterifikasi menggunakan Katalis Zeolit Alam Aktif (ZAH) dalam Pembuatan Biodiesel dari Minyak Jelantah Kartika, Dwi; Widyaningsih, Senny
Jurnal Natur Indonesia Vol 14, No 3 (2012)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (208.189 KB) | DOI: 10.31258/jnat.14.3.219-226

Abstract

Transesterification of waste cooking oil into biodiesel using KOH catalyst with and without esterification process usingactivated natural zeolite (ZAH) catalyst has been carried out. Activation of the zeolite was done by refluxing with HCl 6Mfor 30 min, followed calcining and oxydized at 500oC for 2 hours, consecutively. The transesterification without esterificationprocess were done using KOH catalyst 1% (w/w) from oil and methanol weight and oil/methanol molar ratio 1:6 at 60oC. Theesterification reaction was also done using ZAH catalyst then continued by transesterification using KOH catalyst inmethanol media. In order to study the effect of ZAH catalyst concentration at constant temperature, the catalysts werevaried, i.e. 0, 1, 2, and 3% (w/w). To investigate the effect of temperature, the experiments were done at various temperaturefrom 30, 45, 60, and 70oC at constant catalyst concentration. The conversion of biodiesel was determined by 1H-NMRspectrometer and physical properties of biodiesel were determined using ASTM standard methods. The results showedthat the transesterification using KOH catalyst without esterification produced biodiesel conversion of 53.29%. The optimumcondition of biodiesel synthesis via esterification process were reached at 60oC and concentration of ZAH catalyst of2% (w/w), that could give biodiesel conversion = 100.00%. The physical properties were conformed with biodiesel ASTM2003b and Directorate General of Oil and Gas 2006 specification.
PEMANFAATAN LIMBAH Fe(III) DARI INDUSTRI PENGETSAAN SEBAGAI BAHAN PENAMBAH KUALITAS SINTESIS GENTENG KERAMIK Delsy, Eva Vaulina Yulistia; Kartika, Dwi; Aziza, Wilma
Molekul Vol 10, No 2 (2015)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (356.19 KB) | DOI: 10.20884/1.jm.2015.10.2.3

Abstract

Limbah dihasilkan dari berbagai macam kegiatan manusia, di antaranya dari bidang industri. Salah satu Industri yang menghasilkan limbah adalah industri pengetsaan  yang bergerak di bidang cetak relief seperti industri percetakan, industri pengrajin logam, dan industri pengrajin lencana. Limbah yang dihasilkan mengandung senyawaan anorganik dan asam-asam kuat seperti H2SiF6, HNO3, dan FeCl3. Senyawa anorganik banyak berperan dalam industri genteng keramik terutama dalam hal kualitas genteng. (Darmono, 2009).  Limbah FeCl3 yang dihasilkan dari kegiatan pengetsaan digunakan pada penelitian ini sebagai bahan penambah kualitas pembuatan genteng keramik dari tanah lempung Desa Kalijaran, Purbalingga.  Limbah dikontakkan dengan tanah yang akan digunakan sebagai bahan baku pembuatan genteng, divariasikan menjadi limbah yang tidak diencerkan dan limbah yang diencerkan. Lempung dibuat variasi ukuran butir 60, 80, 100, 140, dan 230 mesh, sedangkan variasi waktu yang dilakukan adalah 30-100 menit  agar diketahui ukuran partikel dan waktu optimum ketika terjadi penyerapan maksimal logam Fe (III).  Hasil penelitian menunjukkan ukuran partikel dan waktu optimum untuk pengontakan lempung dengan kedua variasi limbah yaitu pada ukuran partikel 80 mesh dengan waktu 70 menit. Uji sifat fisik pada genteng-Fe memenuhi semua standar SNI dan diketahui genteng dengan kualitas terbaik yaitu menggunakan lempung yang telah dikontakkan dengan limbah yang dibuat 1000 kali pengenceran.  Uji pelucutan Fe(III) pada badan genteng oleh air hujan dan air laut menunjukkan bahwa laju rata-rata pelucutan badan genteng yang  direndam dengan limbah yang diencerkan sebesar 68 ppb/ hari dan 55 ppb/hari sedangkan untuk badan genteng yang direndam dengan limbah yang tidak diencerkan sebesar 72,2 ppb/ hari dan 56 ppb/hari
KECEPATAN ADUK DAN WAKTU KONTAK OPTIMUM PEMBUATAN BIODIESEL DARI MINYAK JELANTAH Dwi Kartika; Eva Vaulina; Senny Widyaningsih; Moch. Chasani
Molekul Vol 5, No 1 (2010)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (241.422 KB) | DOI: 10.20884/1.jm.2010.5.1.74

Abstract

Synthesis of biodiesel from waste cooking oil using activated natural zeolite catalyst has been done. Activation of the natural zeolite was done by refluxing with HCl 6M for 30 min, calcining and oxydizing at 500°C for 2 hours, consecutively. The variation of stirring speed were 350, 700, 1100 and 1200 rpm. The variation of reaction time were varied from 15, 30, 45, 60, and 120 min. The conversion of biodiesel was determined by 1H NMR spectrometer. The results showed that the optimum condition of biodiesel synthesis using esterification process were reached at 700 rpm and 15 minutes, which gave biodiesel conversion of 100%.
PEMANFAATAN KATALIS NI/ZEOLIT PADA HIDROGENASI KATALITIK ETIL PALMITAT MENJADI SETIL ALKOHOL Dwi Kartika; Triyono Triyono; Karna Wijaya; Dewi Yuanita L; D. Setyawan PH D. Setyawan PH
Molekul Vol 5, No 2 (2010)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (111.534 KB) | DOI: 10.20884/1.jm.2010.5.2.80

Abstract

The catalytic hydrogenation of methyl palmitate to cetyl alcohol using Ni supported on activated natural zeolite catalysts (Ni/Zeolite) has been carried out. In this work, the effect of catalyst amounts and H2 flow rate on methyl palmitate conversion and yield of cetyl alcohol were studied. Catalytic hydrogenation was performed in stainless steel fixed bed reactor. The methyl palmitate (10 g) was loaded into the reactor vessel at 400 °C for 30 minutes. In order to study the effects of catalyst amount at constant H2 flow rate, the catalyst were varied i.e. 5, 10, and 15 g. To investigate the effects of H2 flow rate were varied from 20, 40, and 60 mL.min-1 at constant catalyst amount. The composition of the products was analyzed by GC and GC-MS. The results showed that methyl palmitate conversion increase with the increasing of catalyst amount. The highest methyl palmitate conversion (45.62 %) and yield of cetyl alcohol (36.44 %) were obtained for 15 g catalyst and 40 mL. min-1 H2 flow rate.
Identification of Secondary Metabolites Compounds and Antibacterial Activities on The Extract of Soursop Leaf Dian Riana Ningsih; Zusfahair Zusfahair; Dwi Kartika
Molekul Vol 11, No 1 (2016)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (445.261 KB) | DOI: 10.20884/1.jm.2016.11.1.199

Abstract

Treatment of bacterial infectious diseases using semi-synthetic antibiotics can lead to resistance, so as to overcome it necessary to search for natural ingredients from plant extracts that has potential as an antibacterial, one of which is the leaf extract of soursop (Annona muricata L.). This study aims to determine the antibacterial activity of soursop leaf against E. coli and identify groups most active chemical compounds from the extracts. Soursop leaves extracted by maceration using n-hexane, chloroform and methanol. The extracts were tested for antibacterial activity using the diffusion method. Extract with the highest activity determined the minimum inhibitory concentrations grow (MIC) and tested the content of secondary metabolites with phytochemical test, subsequently identified using IR spectrophotometer. Soursop leaves with extraction solvent n-hexane, chloroform and methanol to produce n-hexane extract (E1), the chloroform extract (E2), and the methanol extract (E3) with a yield respectively 0.82%; 5.21%; 8.2% and produce antibacterial activity with consecutive inhibition zone of 3.52 mm; 8.34 mm; 3.00 mm. MIC of soursop leaf chloroform extract of the E. coli bacteria that is at a concentration of 1 ppm with inhibition zone of 3.23 mm. Based on the test results phytochemical soursop leaf chloroform extract showed the presence of compounds alkaloids, steroids, saponins and tannins. IR spectrophotometer identification results showed that the chloroform extract of the leaves of the soursop has functional groups OH, aliphatic C-H, C = O, C = C aromatic, CH3, C-O ether and C-H outside the field.
SPESIASI Cr(III) DAN Cr(VI) PADA LIMBAH CAIR INDUSTRI ELEKTROPLATING Dian Windy Dwiasi; Dwi Kartika
Molekul Vol 3, No 2 (2008)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (139.676 KB) | DOI: 10.20884/1.jm.2008.3.2.52

Abstract

Speciation of Cr(III) and Cr(VI) in wastewater have been widely investigated. The species of Cr(III) and Cr(VI) in wastewater samples were determined by UV – Vis Spectrometry and Atomic Absorption Spectrometry (AAS). The method described is based upon the spectrophotometric determination of the magenta chromagen (λmax = 545 nm) formed when 1,5-diphenylcarbazide reacts with hexavalent chromium in sulphuric acid solution. Hexavalent chromium are determined by a calibration curve technique. The result showed that Cr(VI) concentration are still on the government regulation (Menteri Negara Kependudukan dan Lingkungan Hidup No. 03/MENKLH/II/1991).
AKTIVITAS ANTIBAKTERI MINYAK ATSIRI DAUN PALA DARI BANYUMAS TERHADAP Staphylococcus aureus DAN Escherichia coli SERTA IDENTIFIKASI SENYAWA PENYUSUNNYA Undri Rastuti; Senny Widyaningsih; Dwi Kartika; Dian Riana Ningsih
Molekul Vol 8, No 2 (2013)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (456.384 KB) | DOI: 10.20884/1.jm.2013.8.2.142

Abstract

Staphylococcus aureus dan Escherichia coli adalah bakteri yang dapat menyebabkan infeksi. Umumnya masyarakat dalam mengobati penyakit infeksi terhadap bakteri sering menggunakan antibiotik, namun apabila digunakan secara berlebihan dan kurang terarah dapat mengakibatkan terjadinya resistensi. Untuk mengatasinya diperlukan pencarian bahan alami sebagai alternatif pengobatan, salah satunya yaitu minyak atsiri daun pala. Penelitian inibertujuan untuk mengetahui aktivitas antibakteri minyak atsiri daun pala dari Banyumas terhadap S. aereus dan E. coli serta mengidentifikasi senyawa penyusunnya. Minyak atsiri dari serbuk daun pala kering diisolasi menggunakan metode destilasi air. Minyak atsiri yang diperoleh diuji sifat fisik dan dilakukan identifikasi senyawa penyusunnya menggunakan GC-MS. Pengujian aktivitas antibakteri dilakukan dengan menggunakan metode difusi untuk mengetahui Konsentrasi Hambat Tumbuh Minimum (KHTM) terhadap S. aereus  dan E. coli. Rendemen minyak atsiri daun pala yang diperoleh sebesar 1,34%. Minyak atsiri ini berwarna kuning pucat, berbau khas minyak pala dengan indeks bias sebesar 1,4779 dan bobot jenis sebesar 0,8862 g/cm3. Minyak atsiri daun pala diketahui memiliki 33 komponen kimia dan 5 komponen kimia terbesarnya adalah sabinene, terpinene-4-ol, α-pinene, β-pinene, and β-phellandrene. Minyak atsiri daun pala terbukti memiliki aktivitas antibakteri terhadap S. aureus dengan KHTM pada konsentrasi minyak atsiri 3,125%  menghasilkan zona hambat sebesar 16,81 mm dan terhadap E. coli dengan KHTM pada konsentrasi minyak atsiri 1% menghasilkan zona hambat sebesar 0,54 mm.
APLIKASI 1H-NMR DALAM PENENTUAN KONVERSI METIL ESTER PADA PEMBUATAN BIODIESEL Dwi Kartika; Yoeswono Yoeswono
Molekul Vol 3, No 2 (2008)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (5.417 KB) | DOI: 10.20884/1.jm.2008.3.2.50

Abstract

Determination of methyl ester conversion on biodiesel processing using 1H-NMR spectrometer has been done. Methoxy spectra from methyl ester would appear at 3,7 ppm (singlet), spectra at 4,2 ppm (doublet of doublet) was glyceridic proton. The spectrum could be used as reference to determine the degree of biodiesel conversion, because spectra at chemical shift 4.2 ppm was characteristic for triglyceride that methyl ester did not have it. Whereas, spectra at chemical shift 3.7 ppm was characteristic for methyl ester that triglyceride did not have it. The extent of both spectrum indicated for incompletness in biodiesel synthesis.
Formulation of M/A-Type Ointment Dosage From Ethanol Extract of White Plumeria Leaves (Plumeria alba l.) Against Candida albicans Dian Riana Ningsih; Zusfahair Zusfahair; Dwi Kartika; Mei Lianasari
The Journal of Pure and Applied Chemistry Research Vol 7, No 3 (2018): Edition September-December 2018
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (721.358 KB) | DOI: 10.21776/ub.jpacr.2018.007.03.421

Abstract

Candida albicans is one of fungi that can cause various infections. This fungal infection is known as candidiasis and some people often suffer from candidiasis. The sweaty and moisty skin is a factor that allows the growth of fungi causing skin diseases. The plants that can be used as antifungal is white plumeria leaves (Plumeria alba L.). Ethanol extract of white plumeria leaves contains alkaloid and saponin active compounds, to ease its use and to get the maximum effect, then white plumeria leaves are formulated into ointment dosage form. This research is to know the antifungal activity of extract, to formulate ointment and to know the characteristic of the extract. The research begins with determination of minimum inhibitory concentration (MIC) of extract against C. albicans, then formulation of ointment dosage. The physical properties of the ointment is tested including homogeneity test, pH, dispersive power, protection power, adhesion and hedonic and antifungal activity. The method used in determining MIC and the activity test of dosage is agar-well diffusion method. The MIC value of extract was 5 ppm with a 1.22 mm inhibition zone. Extract has a form of semisolid, white colour, distinctive odor, homogeneous, protective, pH of 5.07-5.59, dispersive power of 5,09-5,78 cm, adhesion of 1.00-2.33 seconds and antifungal activity of ointment at day 0 for concentrations of 5, 10 and 15 ppm respectively are 2.93; 5.2 and 7.87 mm and at day 15 for concentrations of 5, 10 and 15 ppm respectively are 3.68; 4.87 and 5.82 m