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Unesa Journal of Chemistry
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UNESA Journal of Chemistry is published online by the Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia. 60231. Published 3 times a year (January, May and September) Aims and Scope: UNESA Journal of Chemistry is online Journal covering all aspects of Chemistry. The journal publishes original research paper and review articles.
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PENGARUH PENGOMPOSAN TERHADAP RASIO C/N KOTORAN AYAM DAN KADAR HARA NPK TERSEDIA SERTA KAPASITAS TUKAR KATION TANAH (COMPOSTING EFFECT OF CHICKEN MANURE TOWARDS C/N RATIO AND AVAILABLE NPK NUTRIENT AND SOIL CATION EXCHANGE CAPACITY) ELSA SURYA, RIZA Elsa
Unesa Journal of Chemistry Volume 2, Number 1, 2013
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Abstrak. Telah dilakukan penelitian tentang pengaruh pengomposan terhadap rasio C/N kotoran ayam dan kadar hara NPK tersedia serta kapasitas tukar kation (KTK) tanah. Penelitian ini terdiri dari dua tahap yaitu: pertama mengetahui pengaruh pengomposan terhadap kadar C-organik, N-total, dan rasio C/N pupuk kandang ayam. Kedua mengetahui perubahan kadar NPK tersedia dan KTK tanah pupuk kandang ayam yang dicampur dengan tanah selama 8 minggu. Hasil penelitian menunjukkan pupuk kandang ayam hasil fermentasi EM4 memiliki kadar C-organik 17,4%; N-total 1,73%; dan rasio C/N 10. Rasio C/N yang didapatkan telah masuk dalam rentang standar yaitu 10-20. Pengukuran kadar hara NPK bentuk tersedia tertinggi didapatkan pada minggu ke-8. Kadar hara NPK tersedia berturut-turut adalah 10,7354 ppm; 164,6667 ppm; dan 235,1667 ppm. Masing-masing kadar masuk dalam kategori rendah, sangat tinggi, dan sedang. KTK tanah tertinggi ada pada minggu ke-8 yaitu 206,2899 meq/100gram.   Kata kunci: pengomposan, kotoran ayam, NPK tersedia, KTK tanah     Abstract. A studied about the composting effect of chicken manure towards C/N ratio and available NPK nutrient and soil cation exchange capacity (CEC) had been done. This studied consisted of two phases: first determine the effect of composting on levels of C-organic, N-total, and C / N ratio of chicken manure. The second were to know the changes of NPK available and soil CEC on chicken manure that mixed with soil for 8 weeks. The results showed chicken manure fermented using EM4 had 17,4% of C-organic; of 1,73% N-total; and 10 of C/N ratio. Its has been obtained in the standard range is 10-20. Measurement of levels of available NPK nutrients had higher levels obtained at eighth weeks is 10,7354 ppm; 164,6667 ppm; and 235,1667 ppm. Each level in the category of low, very high, and medium. Soil CEC had higher levels at eighth week is 206.2899 meq/100gram.   Keywords: composting, chicken manure, available NPK, soil CEC
PEMURNIAN DAN KARAKTERISASI BIODIESEL DARI MINYAK BIJI KELOR (MORINGA OLEIFERA) DENGAN MENGGUNAKAN ADSORBEN BENTONIT (PURIFICATION AND CHARACTERIZATION OF BIODIESEL FROM KELOR SEED OIL (MORINGA OLEIFERA) WITH ADSORBENT BENTONITE) DESTRI N, FRITA Destri; Nasrudin, Harun
Unesa Journal of Chemistry Volume 2, Number 1, 2013
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Abstrak: Biodiesel dari minyak biji kelor dapat diperoleh melalui reaksi esterifikasi dan transesterifikasi. Reaksi transesterifikasi menghasilkan biodiesel kotor yang mengandung metil ester, gliserol dan pengotor lain berupa sisa reaktan dan katalis yang akan mempengaruhi kualitas dari biodiesel sehingga harus dihilangkan dari produk. Tujuan penelitian ini adalah menyiapkan biodiesel dari minyak biji kelor, dan mempelajari pengaruh metode dry washing menggunakan adsorben bentonit. Metode dry washing diterapkan untuk mendapatkan biodiesel dengan kandungan metil ester dengan kualitas yang baik. Hasil penelitian menunjukkan bahwa, kondisi optimum didapatkan pada waktu interaksi antar biodiesel dengan adsorben selama 3 jam dengan karakteristik flash point 185 oC; pour point -4 oC; indeks setana 54,3 dan viskositas 4,17cSt. Dengan demikian karakteristik biodiesel tersebut telah sesuai dengan standar SNI dan dibandingkan dengan penelitian pemurnian biodiesel menggunakan air hasil karakteristik biodiesel yang diperoleh lebih baik. Untuk selanjutnya perlu dilakukan penelitian dengan waktu interaksi lebih dari 3 jam untuk mendapatkan waktu interaksi optimum.Kata kunci: Biodiesel, Minyak biji kelor, bentonit, Dry washingAbstract: Biodiesel from moringa seed oil can be obtained through esterification and transesterification reactions. Transesterification reaction produces biodiesel gross containing methyl ester, glycerol, and other impurities such as residual reactants and catalysts that will affect the quality of biodiesel and should be removed from the product. The purpose of this study is to prepare biodiesel from kelor seed oil, and studied the effect of dry washing method using bentonite adsorbents. Dry washing method is applied to obtain the content of methyl ester biodiesel with good quality. The results showed that the optimum conditions obtained at the time of the interaction between biodiesel with adsorbent for 3 hours with the characteristics of flash point of 185 ° C; pour point of -4 ° C; cetane index of 54.3 and a viscosity of 4.17 cSt. Thus the characteristics of biodiesel has been in accordance with ISO standards and compared to biodiesel using water purification research results obtained biodiesel characteristics better. To further research needs to be done for theKeywords: Biodiesel, kelor seed oil, bentonite, Dry washing.
PENGARUH TEH KOMBUCHA TERHADAP KADAR GLUKOSA DARAH RATTUS NORVEGICUS (THE EFFECT OF KOMBUCHA TEA ON BLOOD GLUCOSE LEVELSOF RATTUS NOVERGICUS) LUKITAWATI, WINDY
Unesa Journal of Chemistry Volume 2, Number 1, 2013
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Abstrak.Tujuan penelitian ini adalah mengetahui pengaruh pemberian teh kombucha terhadapkadar glukosa darah Rattus norvegicus. Jenis penelitian ini adalah eksperimen sungguhan (trueexperiment) yang melibatkan empat kelompok hewan coba, dengan dosis asupan teh kombuchaberturut-turut 0 ml/ekor, 5,5 ml/ekor, 8 ml/ekor, dan 11 ml/ekor. Pengukuran kadar glukosa darahdengan metode reduksi glukosa darah menggunakan alat Glucometer ?On-Call Plus? BloodGlucose Monitoring System. Hasil penelitian ini menunjukkan bahwa teh kombucha yang diberikanpada hewan coba Rattus norvegicus dengan dosis asupan 5,5 ml/ekor, 8 ml/ekor, dan 11 ml/ekormemiliki potensi menurunkan kadar glukosa darah. Berdasarkan hasil uji anava dua arah yangdilanjutkan dengan uji Post Hoc Test menunjukkan bahwa tidak ada pengaruh yang signifikan padainteraksi antara faktor dosis teh kombucha dengan faktor waktu pengambilan sampel darahterhadap penurunan kadar glukosa darah Rattus norvegicus. Untuk faktor dosis teh kombucha, dosis5,5ml/ekor maupun 8ml/ekor memiliki perbedaan signifikan jika dibandingkan dengan kelompokkontrol. Artinya: (1) minum teh kombucha menyebabkan dampak menurunkan kadar glukosa darahRattusnorvegicus,(2)mengkonsumsi teh kombucha baik 5,5 ml maupun 8 ml menyebabkanpenurunan kadar glukosa darah, serta (3) konsumsi 5,5 ml maupun 8 ml memberikan pengaruhpenurunan kadar glukosa darah yang tidak berbeda.Kata Kunci: Teh kombucha, glukosa darah, Rattus norvegicusAbstract.The purpose of this study was to determine the effects of kombucha tea on blood glucoselevels of Rattus norvegicus. This type of research is true exsperiment involving four groups ofexperimental animals, a dose of kombucha tea intake respectively 0 ml/rat, 5,5 ml/rat, 8 ml/ rat, and11 ml/rat. Measurement of blood glucose levels with blood glucose reduction method using aGlucometer "On-Call Plus" Blood Glucose Monitoring System. The results of this study indicate thatkombucha tea is given to the animal Rattus norvegicus dose intake of 5,5 ml/rat, 8 ml/rat, and 11ml/trat has the potential to reduce blood glucose. Based on the results of two-way Anova testfollowed by Post Hoc Test showed no significant effect on the interaction between the factors dosekombucha tea with blood sampling time factor to the decline in blood glucose levels Rattusnorvegicus. The factor of kombucha tea dose, a dose of 5,5 ml/rat and 8 ml/rat has significantdifferences when compared with the control group. This means: (1) drinking kombucha tea causes adecrease in blood glucose levels ofRattus norvegicus,(2)consumption of kombucha tea, both 5,5 mland 8 ml causes a decrease in blood glucose levels, and (3)consumption of 5,5 ml and 8 ml giveeffect to decrease blood glucose levels were not different.Keywords: kombucha tea, blood glucose, Rattus norvegicus
FILTRASI ION LOGAM CR6+ DENGAN MEMBRAN KOMPOSIT KITOSAN SILIKA (FILTRATION METAL ION CR6+ WITH COMPOSITE CHITOSAN SILICA MEMBRANE) NORALIA, ERMA
Unesa Journal of Chemistry Volume 2, Number 1, 2013
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Abstrak. Telah dibuat membran komposit kitosan silika untuk menurunkan kadar ion logam Cr6+. Membran kompositkitosan silika dibuat dengan konsentrasi silika 0,025M. Karakterisasi membran komposit kitosan silika meliputi ujitarik mulur membran menggunakan autograph dan gugus fungsional dari membran yang diketahui dengan FTIR..Data sifat mekanik membrankomposit kitosan silika menunjukkan bahwa nilai modulus young yaitu 86,80 N/mm2.Karakterisasi membran komposit kitosan silika menggunakan FTIR menunjukkan bahwa munculnya gugus fungsionalOH, NH2, C-H, C-O, C-N, Si-OH, dan Si-O-Si. Uji kinerja membran komposit kitosan silika dilakukan dengan prosesfiltrasi. Koefisien rejeksi membran komposit kitosan silika tertinggi untuk filtrasi Cr6+ yaitu 45,30% dengan konsentrasiawal Cr6+ 20 ppm. Dari data FTIR membran komposit kitosan silika sebelum dan sesudah filtrasi ion logam Cr6+terdapat pergeseran bilangan gelombang pada gugus fungsional yg menunjukkan gugus fungsional yang berperandalam proses filtrasi, yaitu NH2, OH, dan Si-O-Si.Kata Kunci: membran kitosan silika, ion logam Cr6+, filtrasi, koefisien rejeksi.Abstract. Composite chitosan silica membrane can be used to lower the levels of metal ions Cr6+. Composite chitosansilica membrane made with concentration of silica 0.025M. Composite chitosan silica embrane mechanical propertiesshows that the highest value was presented on the young's modulus addition of silica at concentrations of 0.02M with avalue of young's modulus 86.800 N/mm2. Characterization of composite chitosan silica membrane include functionalgroups of the membrane analysis with FTIR. Characterization of composite chitosan silica membrane using FTIRshowed that there was the functional group OH, NH2, CH, CO, CN, Si-OH, and Si-O-Si. From the filtration process itwas obtained that rejection coefficient of the composite chitosan silica membranes for filtration metal ion Cr6+ was45.300% with the early concentration solution of the metal ion Cr6+ 20 ppm. The FTIR of composite chitosan silicamembrane after filtration show that there were shift in the number of waves on a functional group which shows thefunctional groups that functioning in the process of filtration, NH2, OH, and Si-O-Si.Keywords: chitosan silica membrane, metal ion Cr6+, filtration, rejection coefficient.
PENENTUAN PH OPTIMUM DAN KAPASITAS ADSORPSI ION LOGAM NI(II) OLEH KOMPOSIT KITOSAN-ALUMINA (DETERMINATION OF OPTIMUM PH AND ADSORPTION CAPACITY OF NI(II) METAL ION BY CHITOSAN-ALUMINA COMPOSITE) FARDA, ELOK
Unesa Journal of Chemistry Volume 2, Number 1, 2013
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Abstrak. Tujuan dari penelitian ini adalah untuk mengetahui pH optimum dan mempelajari kapasitas adsorpsi ion logam Ni(II) oleh komposit kitosan-alumina. Penentuan pH optimum dilakukan dengan menginteraksikan 20 mL adsorbat dengan 0.1 gram adsorben pada variasi pH medium 3, 4, 5, 6 dan 7. Kapasitas adsorpsi ditentukan dengan memvariasi konsentrasi adsorbat ion logam Ni(II) pada 10, 40, 80, 100, 300, 700, 800, 900, 1000, 1200, 1600 dan 1800 mg/L pada pH optimum. Nilai pH optimum adsorpsi dihasilkan pada  pH 5 dengan daya adorpsi sebesar 30.275 %. Kapasitas adsorpsi komposit kitosan-alumina yang diperoleh menggunakan isotherm Langmuir sebesar 7.018x10-4 mol/g dan isotherm Freundlich sebesar 78.126x10-4 mol/g. Kata Kunci: komposit kitosan-alumina, kapasitas adsorpsi. Abstract. The aim of this experiment were to know optimum pH and to study adsorption capacity of Ni(II) metal ion by chitosan-alumina composite. Determination of optimum pH was did to interact 20 mL adsorbate with 0.1 gram adsorbent at variation of medium pH 3, 4, 5, 6 and 7. The adsosrption capacity was determined by various concentration of adsorbate Ni(II) metal ion 10, 40, 80, 100, 300, 700, 800, 900, 1000, 1200, 1600 and 1800 mg/L at Optimum pH. The result of optimum pH was pH 5 with adsorption value 30.275 %. The adsorption capacity of chitosan-alumina composite was 7.018x10-4 mol/g by Langmuir isotherm and 78.126x10-4 mol/g by Freundlich isotherm. Keywords: chitosan-alumina composite, adsorption capacity.
PENGARUH JENIS BAMBU DAN KONSENTRASI NATRIUM BISULFIT TERHADAP RENDEMEN NATRIUM LIGNOSULFONAT (EFFECT OF TYPE OF BAMBOO AND CONCENTRATION SODIUM BISULFITE ON YIELD SODIUM LIGNOSULFONATE) Nasrudin, Harun; ANDRIANI, EVA
Unesa Journal of Chemistry Volume 2, Number 1, 2013
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Abstrak. Lignosulfonat merupakan produk turunan lignin yang tersulfonasi dan dapatdimanfaatkan sebagai natrium (dispersant, emulsifier), pengikat (binder agent), bahan aditifdalam industri kosmetik, dan farmasi. Bambu mempunyai rendemen lignin yang cukup besaryaitu 19,8 - 26,6 %. Natrium lignosulfonat dapat dibuat dengan mereaksikan serbuk bambudengan natrium bisulfit (NaHSO3) sebagai agen pensulfonasi. Penelitian ini bertujuanmengetahui pengaruh jenis bambu dan konsentrasi larutan NaHSO3 terhadap prosen rendemennatrium lignosulfonat dari batang bambu. Bambu yang digunakan dalam penelitian ini adalahbambu Ori dan bambu Apus. Reaksi dilakukan dalam labu leher dua pada pH 4, suhu 105 0C,kecepatan pengadukan 80 rpm, dan waktu reaksi selama 30 menit. Hasil dianalisismenggunakan spektrofotometer FT-IR dan UV-Vis. Berdasarkan hasil penelitian, semakinbesar rendemen lignin dan konsentrasi natrium bisulfit, maka rendemen lignosulfonat yangdiperoleh juga semakin besar. Rendemen lignosulfonat terbesar diperoleh pada bambu Oridengan konsentrasi NaHSO3 30% yaitu sebesar 28,60%. Berdasarkan perhitungan darispektrofotometer UV-Vis menunjukkan bahwa nilai kemurnian lignosulfonat hasil penelitianmasih cukup rendah yaitu sebesar 40,87 % pada bambu Ori dan 41,20 % pada bambu Apus.Kata kunci : natrium lignosulfonat, serbuk bambu, natrium bisulfitAbstract. Lignosulfonate is a sulfonated lignin derivatives and can be used as a surfactant(dispersant, emulsifier), binder (binder agent), the additive in the cosmetics industry, andpharmaceuticals. Bamboo has a substantial lignin content 19.8 to 26.6%. Sodium lignosulfonatecan be made with bamboo powder reacting with sodium bisulfite (NaHSO3) as sulfonationagents. This study aims to determine the effect of species of bamboo and NaHSO3 concentrationagainst percent sodium lignosulfonate levels of bamboo rods. Bamboo is used in this study Oribamboo and bamboo Apus Ori. Reactions were performed in two neck flask at pH 4,temperature of 105 0C, 80 rpm stirring speed, and reaction time of 30 minutes. The results werethen analyzed using a spectrophotometer FT-IR and UV-Vis. Based on the results of the studyfound that the greater the concentration of sodium bisulfite and lignin content of bamboo foundin the levels of lignosulfonate obtained also getting bigger. Levels of lignosulfonate largestbamboo Ori obtained at a concentration of NaHSO3 30% is equal to 28.60%. Based on thecalculation of the UV-Vis spectrophotometer showed that the purity of lignosulfonate researchis still quite low at 40.87% at 41.20% on bamboo Ori and bamboo Apus.Keywords: lignosulfonate surfactant, bamboo powder, sodium bisulfite
UJI AKTIVITAS BAKTERI KITINOLITIK DARI TAMBAK UDANG DI LAMONGAN DAN SIDOARJO (ACTIVITY ASSAY OF CHITINOLYTIC BACTERIA FROM SHRIMP PONDS IN LAMONGAN AND SIDOARJO) FAUZIAH,
Unesa Journal of Chemistry Volume 2, Number 1, 2013
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Abstrak. Bakteri kitinolitik telah berhasil diisolasi dari tambak udang di Lamongan dan Sidoarjo denganmenggunakan media yang mengandung 0.3% kitin koloidal. Diperoleh 54 isolat dari Lamongan yang diberi kode LA 1sampai LA 54 dan 78 isolat dari Sidoarjo yang diberi kode SDA 1 sampai SDA 78. 36 isolat dari Lamongan dan 67isolat dari Sidoarjo menunjukkan aktivitas kitinase. Uji aktivitas kitinase secara kualitatif ditentukan berdasarkan zonabening yang ditunjukkan disekitar koloni. Uji aktivitas kitinase secara kuantitatif ditentukan berdasarkan Nasetilglukosaminyang dilepaskan menggunakan metode Monreal and Reese. Aktivitas kitinase tertinggi ditunjukkanoleh isolat LA 21 dan LA 41 masing-masing sebesar 0.731 dan 0.615 U/mL.Kata Kunci: bakteri kitinolitik, kitin koloidal, zona bening.Abstract. Chitinolytic bacteria had been isolated from shrimp pond in Lamongan and Sidoarjo by using media withcontaining 0.3% chitin colloidal. Produced 54 isolates from Lamongan labelled LA 1 until LA 54 and 78 isolates fromSidoarjo labelled SDA 1 until SDA 78. 36 isolates from Lamongan and 67 isolates from Sidoarjo showed chitinaseactivity. Qualitatively assay of chitinase activity determined by clear zone around the colony. By using the method ofMonreal and Reese, quantitative assay of chitinase activity can be determined by the release of N-acetylglucosamine.The highest chitinase activity was shown by LA 21 dan LA 41 isolates are 0.731 and 0.615 U/mL respectively.Keywords: chitinolytic bacteria, colloidal chitin, clear zone.
EFEKTIVITAS KANDUNGAN UNSUR HARA N PADA PUPUK KANDANG HASIL FERMENTASI KOTORAN AYAM TERHADAP PERTUMBUHAN TANAMAN TERUNG (SOLANUM MELONGENA L.) (THE EFFECTIVENESS OF NUTRIENT RATE N IN DUNG FERTILIZER FROM FERMENTED CHICKEN MANURE ON THE GROWTH) H S, MIFTAKHUL Hidayatus
Unesa Journal of Chemistry Volume 2, Number 1, 2013
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Abstrak: Konsumsi ayam pedaging yang semakin meningkat mengakibatkan limbah kotoran ayam jugameningkat dan untuk menguranginya dapat dimanfaatkan menjadi pupuk. Pupuk kandang ayam dihasilkandari fermentasi kotoran ayam selama 8 hari menggunakan starter EM4. Hasil analisis pupuk kandangmengandung kadar hara N, C-organik masing-masing sebesar 0,554%, 3,308% dan rasio C/N 6. Dilakukanuji lapangan pengaruh terhadap pertumbuhan tanaman terung untuk mengetahui efektivitas kandunganhara yang terdapat pada pupuk kandang dengan pembanding pupuk komersial urea. Pengamatan terhadappertumbuhan tanaman terung dan pengukuran kadar hara N, C-Organik dan total bakteri dilakukan setiap10 hari selama 30 hari. Parameter pertumbuhan tanaman terung yang diamati adalah tinggi tanaman danjumlah daun. Pengukuran kadar N menggunakan metode Kjedhal, C-Organik menggunakan metode walkyand black dan total bakteri menggunakan plate count. Berdasarkan analisis statistik terdapat pengaruhlama hari dan perlakuan pupuk terhadap tinggi tanaman dan jumlah daun. Kadar hara nitrogen dan totalbakteri menunjukkan tidak terdapat pengaruh hari maupun jenis pupuk. Kadar C-Organik menunjukkanterdapat pengaruh hari dan tidak terdapat pengaruh pupuk.Kata kunci: pupuk kompos, fermentasi, terungAbstract: The increasing on chicken consumption results on the increasing amount of chicken manureresidual. Therefore, to reduce the amount of those residual, we can make use of it as fertilizer. The dungfertilizer was fermented from chicken manure during 8 days using EM4 starter. From the analysis, thosefertilizer contains nutrient rate N, C-organic with percentages 0.554%, 3.308% and C/N rasio 6,respectively. Field test was done to know the effect of dung fertilizer to the growth of eggplant and nutrientrate, then, the data are compared with commercial fertilizer Urea. The observation with respect to thegrowth of eggplant and nutrient rate N, C-Organik and bacteria amount was done every 10 days in 30 days.The growth parameters of eggplant to be considered here are the height of plant and the number of leaf. TheN rate was measured using Kjedhal method, while C-Organic using walky and black method and bacteriaamount using plate count. Statistical analysis showed that there was a difference the height of plant and thenumber of leaf between days and fertilizer treatment. Levels of nitrogen and total bacteria showed nodifference between the treatment of each fertilizer and days. Levesl of C-Organik fertilizer treatmentsshowed there was no difference and there was a difference between the days.Keywords: dung fertilizer, fermented, eggplant
SINTESIS NANOGOLD DAN KARAKTERISASI MENGGUNAKAN MATRIK CETOSTEARYL ALCOHOL SEBAGAI PEREDAM RADIKAL BEBASDALAM KOSMETIK (SYNTHESIS AND CHARACTERIZATION OF NANOGOLD USING MATRIX CETOSTEARYL ALCOHOL AS FREE RADICALS SCAVENGING IN COSMETIC) FITRI YANTI, EKA Fitri
Unesa Journal of Chemistry Volume 2, Number 1, 2013
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Abstrak.Telah dilakukan penelitian tentang sintesis dan karakterisasi nanogold menggunakan matrik cetostearyl alcohol sebagai peredam radikal bebas dalam kosmetik. Tujuan dari penelitian ini untuk mengetahui pengaruh konsentrasi larutan HauCl4 terhadap diameter cluster dan mengetahui aktivitas peredaman radikal bebas oleh nanogold menggunakan matrik cetostearyl alcohol.Sintesis nanopartikel emas dilakukan melalui beberapa tahap, yaitu pembuatan larutan induk HAuCl4, mereduksi larutan HAuCl4 melalui proses bottom-up yaitu dengan cara mereduksi ion logam (Au3+) menjadi logam yang tidak bermuatan (Au0) yang ditandai dengan perubahan warna dari kuning menjadi merah anggur, selanjutnya koloid nanopartikel emas diuji menggunakan spektrofotometer UV-Vis. Berdasarkan hasil penelitian didapatkan ukuran cluter meningkat seiring meningkatnya konsentrasi larutan HAuCl4. Aktivitas peredaman radikal DPPH oleh nanogold menggunakan matrik cetostearyl alcohol meningkat seiring meningkatnya konsentrasi nanogold. Katakunci :Cetostearyl Alcohol,  DPPH, Nanogold,Sintesis. Abstract.It has been done researchabout synthesis and characterization of nanogold using matrix cetostearyl alcohol as free radicals scavenging in cosmetic.The purpose of this study to determine the effect of the concentration of HAuCl4 solution to the size of cluster and determine the activity of free radicals by nanogold using cetostearyl alcohol matrix. Synthesis of gold nanoparticles through several stages, namely the manufacture of mother liquor HAuCl4, reducing solution HAuCl4 through a bottom-up process that is by reducing the metal ions (Au3+) to metal charged (Au0) indicated by the color change from yellow to red wine, The next colloidal gold nanoparticles were tested using UV-Vis spectrophotometer. Based on the results obtained cluter size increased with increasing concentrations of HAuCl4 solution. Activity of free radicals by nanogold using cetostearyl alcohol matrix increases with increasing concentration of nanogold. Keywords: Cetostearyl Alcohol, DPPH, Nanogold, Synthesis
PENGARUH MASSA GLISEROL TERHADAP TITIK LELEH PLASTIK BIODEGRADABLE DARI PATI UBI KAYU (THE GLYCEROL MASS EFFECT TOWARD MELTING POINT OF BIODEGRADABLE PLASTIC FROM WOOD CASSAVA STARCH) PRASETYO R, TRI Prasetyo
Unesa Journal of Chemistry Volume 2, Number 1, 2013
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Abstrak. Plastik biodegradable berbahan pati ubi kayu dan serat batang ubi kayu telah di buatdengan penambahan gliserol. Dalam penelitian ini bertujuan untuk mengetahui pengaruhpenambahan massa gliserol terhadap titik leleh plastik biodegradable. Pengujian titik leleh dilakukandengan menggunakan alat Melting block. Sejumlah kecil sampel digerus sehalus mungkin. Sampeldimasukkan kedalam pipa kapiler hingga serbuk sampel yang ada di pipa kapiler setinggi 0,5 cm laludi masukkan dalam melting block. Data yang dihasilkan dalam penelitian ini menunjukkan bahwatitik leleh tertinggi dihasilkan dari pati tanpa penambahan gliserol yaitu sebesar 221,670C. hal ini dikuatkan dengan pengujian FTIR pada masing-masing sampel plastik sehingga menunjukkan titikmaksimum kandungan gugus OH berada pada film plastik dengan tanpa penambahan gliserol yaitusebesar 3130 cm-1.Kata Kunci: Pati ubi Kayu, Gliserol, Titik Leleh, plastik biodegradabelAbstract. Biodegradable plastic from cassava starch and cassava stem fibers have been made withthe addition of glycerol. This study has aim to determine the effect of adding glycerol to the meltingpoint of the mass of biodegradable plastic. Tests were performed by using Melting block tool. A smallamount of samples was crushed as smooth as possible. Samples were added into the capillary tubeuntil the sample powder in the capillary tube reached 0.5 cm then included in the melting block. Thedata generated in this study showed that the highest melting point of the starch produced without theaddition of glycerol in the amount of 221.670 C. This was reinforced by FTIR testing on each plasticsample that show the point of maximum plastic content of OH groups were in plastic film without theaddition of glycerol, that was 3130 cm-1.Keywords : Wood cassava starch, glycerol, melting point,Biodegradable plastic

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