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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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UJI AKTIVITAS GABUNGAN NANOGOLD-NANOPLATINUM SEBAGAI SENYAWA TABIR SURYA DALAM KOSMETIK THE COMBINED ACTIVITY TEST OF NANOGOLD-NANOPLATINUM AS SUNSCREEN COMPOUNDS IN COSMETIC LAILATUN NISFAH, ZULMI
Unesa Journal of Chemistry Vol 5, No 2 (2016): Volume 5, Nomer 2, 2016
Publisher : Unesa Journal of Chemistry

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Abstrak. Telah dilakukan sintesis nanogold-nanoplatinum dengan variasi konsentrasi dan uji aktivitas sebagai senyawa tabir surya. Tujuan dari penelitian ini untuk mengetahui aktivitas tabir surya paduan nanogold-nanoplatinum. Konsentrasi larutan nanogold-nanoplatina yang digunakan antara lain 5, 10, 15, 20, 25, dan 30 ppm. Aktivitas tabir surya ditentukan dari nilai SPF sampel yang dianalisis menggunakan spektrofotometer UV-Vis. Hasil penelitian menunjukkan bahwa nilai SPF NPT  > SPF NG pada konsentrasi yang sama, nilai SPF gabungan NGPT  > NG < NPT yaitu sampel NG 5, NG 10, NG 15, NG 20, NG 25,  NG 30 yaitu 1.119; 6.572; 8.836; 9.313; 9.440; 10.732, sampel NPT 5, NPT 10, NPT 15, NPT 20, NPT 25, NPT 30 yaitu 16.795; 17.165; 17.781; 18.766; 18.860; 19.872, dan NGPT 5, NGPT 10, NGPT 15, NGPT 20, NGPT 25, NGPT 30 yaitu: 10,773; 11,072; 12,081; 15,958; 16,261;  16,320. Aktivitas tabir surya NGPT meningkat sebanding dengan peningkatan konsentrasi nanogold-nanoplatina dalam paduan. Berdasarkan hasil penelitian yang dilakukan dapat disimpulkan bahwa NGPT memiliki proteksi ultra (SPF ≥ 15) terhadap sinar UV B.   Kata Kunci : Tabir surya, Nanogold, Nilai SPF, Nanoplatinum.   Abstract. The research has been done about synthesis of nanogold-nanoplatinum with a variation concentration and activity test as sunscreen compound. The purpose of this research is to find out the sunscreen activity of nanogold, nanoplatinum, and nanogold-nanoplatinum. The concentration of nanogold-nanoplatinum in 5, 10, 15, 20, 25, dan 30 ppm. Sunscreen activity determined by SPF value from samples analyzed using UV-Vis spectrophotometer. The results showed  that SPF  value of NPT  > SPF NG at the same concentration, the combined value SPF NGPT > NG < NPT of sample  NG 5, NG 10, NG 15, NG 20, NG 25,  NG 30 wich is 1.119; 6.572; 8.836; 9.313; 9.440; 10.732, sample NPT 5, NPT 10, NPT 15, NPT 20, NPT 25, NPT 30 wich16.795; 17.165; 17.781; 18.766; 18.860; 19.872, and NGPT 5, NGPT 10, NGPT 15, NGPT 20, NGPT 25, NGPT 30 wich is 10,773; 11,072; 12,081; 15,958; 16,261; and 16,320. Sunscreen activity of nanogold-nanoplatinum (NGPT) increases equal with increases concentration of nanogold-nanoplatinum in the solution. Based on the results of research it can be concluded that combination of nanogold-nanoplatinum (NGPT) have ultra protection factor (SPF ≥ 15) against UV B ray.   Keywords : Nanogold, SPF value, Nanoplatinum, Sunscreen.
KARAKTERISTIK SILIKA DARI LIMBAH PADAT HASIL SINTESIS FURFURAL BERBAHAN DASAR SEKAM PADI SILICA CHARACTERIZTIC FROM SOLID WASTE OF SYNTHESIS MADE FROM FURFURAL BASIC HUSK RICE IQBAL FITRAH HIDAYAT, MUHAMMAD
Unesa Journal of Chemistry Vol 5, No 2 (2016): Volume 5, Nomer 2, 2016
Publisher : Unesa Journal of Chemistry

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Abstrak. Penelitian ini bertujuan untuk mengetahui karakteristik silika dari limbah padat hasil proses sintesis furfural berbahan dasar sekam padi. Penelitian ini terdiri dari 2 tahap, tahap pertama adalah persiapan limbah padat, tahap kedua adalah pembuatan dan karakterisasi silika. Persiapan limbah padat dilakuakan dengan cara mensintesis furfural dari sekam padi dengan metode refluks. Pembuatan silika dilakukan dengan tahap dehidrasi, pemanasan dengan lama 2 jam, 3 jam, dan 4 jam, ekstraksi dengan KOH, pengendapan dengan HCl 5% dan 10 %. Karakterisasi silika dilakukan dengan uji kadar air, kadar abu, daya adsorpsi terhadap I2 hasil yang diperoleh dibandingan dengan SNI 06-2477-1991, sedangkan hasil penentuan gugus fungsi silika dibandingkan dengan teori. Karakteristik silika terbaik diperoleh dari pemanasan 4 jam dengan konsentrasi HCl 10 % karena memiliki kadar air terendah sebesar 8,12 %, kadar abu terendah sebesar 30,06 %, serta daya adsorpsi terhadap I2 tertinggi sebesar 414,459 mg/g. Penentuan gugus fungsi silika dengan dalam penelitian ini mengandung gugus silanol dan siloksan.   Kata kunci: karakterisasi silika, limbah padat furfural, sekam padi.     Abstract. The aim of this research is to know the characteristic of silica from solid waste of furfural synthesis process from rice husk as raw materials. This research concist of two processes. The first process was solid waste preparation and the second process was making and characterization of silica. Solid waste preparation was done by synthesizing furfural from the rice husk by reflux method. Silica preparation was conducted including dehydration process, heating during2 hours, 3 hours and 4 hours, extraction with KOH, precipitation with HCl 5% and 10%. Characteristics of silica was done by testing moisture content, ash content, the adsorption capacity of the I2, in which their results compared with SNI. determination of functional groups of silika are carried out by comparing to those of literature. The best characteristics of silica is obtained from heating during 4 hours with 10 % HCl because it has the lowest moisture content as 8.12%, the lowest ash content as 30.06%, and the highest adsorption power of I2 as 414.459 mg / g. Functional groups of silica obtained in this research have silanol and siloxane.   Keyword: silica characterisatic, solid waste of furfural, rice husk.
PENENTUAN AKTIVITAS -GLUKOSIDASE PADA FERMENTASI SARI KEDELAI DENGAN KULTUR STARTER LACTOBACILLUS PLANTARUM B1765 DETERMINATION OF -GLUCOSIDASE ACTIVITY IN FERMENTATION EXTRACT SOYA WITH STARTER CULTURE LACTOBACILLUS PLANTARUM B1765 HUDA, MARATUL
Unesa Journal of Chemistry Vol 5, No 2 (2016): Volume 5, Nomer 2, 2016
Publisher : Unesa Journal of Chemistry

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Abstrak. Penelitian ini bertujuan untuk mengetahui pengaruh lama fermentasi sari kedelai terhadap pertumbuhan Lactobacillus plantarum B1765, pH, total asam, serta aktivitas enzim -glukosidase yang dilakukan masing-masing selama 6, 12, 18, dan 24 jam pada suhu 37 oC. Penelitian ini dilakukan pengukuran terhadap beberapa parameter yang meliputi pertumbuhan Lactobacillus plantarum B1765 diukur dengan metode spektrofotometer UV-Vis pada panjang gelombang 252 nm, pH dan total asam diukur dengan metode AOAC 1995, serta aktivitas -glukosidase dengan metode Otieno (2007) yang diukur pada panjang gelombang 402 nm. Hasil penelitian menunjukkan pertumbuhan bakteri Lactobacillus plantarum B1765 mencapai fase log  mulai pada jam ke-6 hingga jam ke-24 fermentasi. Perhitungan jumlah total asam tertitrasi didapatkan nilai tertinggi sebesar 1,19% dengan pH terendah sebesar 4,24 pada jam ke-24. Aktivitas -glukosidase tertinggi terjadi pada jam ke-18, dengan aktivitas enzim mencapai 0,868 U/mL. Kata kunci: sari kedelai, Lactobacillus plantarum B1765, -glukosidase   Abstract. This study aimed to determine the effect of fermentation time of soymilk on the growth of  Lactobacillus plantarum B1765, pH, total acid, and β-glucosidase enzyme activity were conducted respectively for 6, 12, 18, and 24 hours at temperatures of 37 oC. This research was conducted measurements of several parameters which include the growth of Lactobacillus plantarum B1765 measured by spektrofotometer UV-Vis method at a wavelength of 252 nm, pH and total acid measured by AOAC 1995 method, and β-glucosidase activity by Otieno (2007) method were measured at a wavelength of 402 nm. The results showed the growth of Lactobacillus plantarum B1765 reached log phase occurred from 6th hour until the 24th hour of fermentation. The calculation of the total amount of acid titration obtained the highest value of 1.19% with a pH lowest at 4.24 at the 24th hour. β-glucosidase activity was highest at the 18th, with the enzyme activity reached 0.868 U/mL. Keywords: Extract soya, Lactobacillus plantarum B1765, -glucosidase
PEMBUATAN ELEKTRODA PASTA KARBON TERMODIFIKASI BENTONIT UNTUK ANALISIS NI(II) PADA KERANG DARAH (ANADARA GRANOSA) SECARA VOLTAMETRI SIKLIK (THE MAKING CARBON PASTE ELECTRODE MODIFIED BENTONITE FOR MEASURINGNI(II) ON COCKLE (ANADARA GRANOSA)BY CYCLIC VOLTAMMETRY) NURIL HABIBAH, ZAMRUD
Unesa Journal of Chemistry Vol 5, No 2 (2016): Volume 5, Nomer 2, 2016
Publisher : Unesa Journal of Chemistry

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Abstrak. Penelitian ini bertujuan untuk mengetahui komposisi elektroda pasta karbon termodifikasi bentonit terbaik, mengetahui pH optimum untukanalisis Ni(II), mengetahui konsentrasi Ni(II) pada daging kerang darahsecara voltametri siklik dan AAS. Elektroda dibuat dari campuran karbon:paraffin:bentonitdengan perbandingan komposisi sebesar 4:1:5, 4:2:4, 4:3:3, dan 4:4:2 dan variasi pH 3, 4, 5 dan 6. Hasil penelitian menunjukkan bahwa elektroda terbaik adalah elektoda pasta karbon termodifikasi bentonit teraktivasi prbandingan komposisi 4:2:4 dengan arus puncak -0,000486 A dan pH optimum adalah pH 6. Konsentrasi Ni(II) pada daging kerang darah secara voltametri siklik pada pengambilan bulan april dan juli rerata 0,50 ppm dan 2,22 ppm sedangkan secara AAS rerata 1,03 ppm dan 2,44 ppm. Kata kunci :voltametri siklik, elektroda, bentonit, Ni(II)   Abstract. The research aims to determine the best composition of carbon paste electrode modified bentonite, knowing the optimum pH analysis, and determine the concentration of Ni(II)  in cockle with voltammetry cyclic method and AAS. Carbon paste electrode maked from carbon:paraffin:bentonite of 4:1:5, 4:2:4. 4:3:3 and 4:4:2 with variation of pH 3, 4, 5 and 6. The result show that the best electrode composition indicated by the carbon composition: paraffin: bentonite activated with a ratio of 4:2:4 with cathodic peak current of -0.000486 and pH optimum for measuring Ni(II) in pH 5. Ni(II) concentrations in cockle by cyclic voltammetry at April is 0.50 ppm and July is 2.22 ppm, while Ni(II) concentration in cockle by AAS method at April is 1.03 ppm and July is 2.44 ppm. Key words :cyclic voltametry, electrode, bentonite, nickel(II)
PENGARUH PENGGUNAAN FITASE AMOBIL BACILLUS SUBTILIS HG PADA JAGUNG TERHADAP BIOAVAILABILITAS CU DAN MG   THE EFFECT OF USAGE IMMOBILIZED PHYTASE BACILLUS SUBTILIS HG IN CORN TO BIOAVAILABILITY OF CU AND MG HANDI HIMAWANI, RAHMA
Unesa Journal of Chemistry Vol 5, No 2 (2016): Volume 5, Nomer 2, 2016
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Abstrak. Pada umumnya enzim fitase digunakan dalam bentuk enzim yang bebas dan hanya dapat digunakan satu kali, sehingga membuat biaya produksi enzim fitase menjadi mahal. Salah satu alternatif dari masalah ini adalah penggunaan fitase amobil karena dapat digunakan sampai beberapa kali pengulangan. Fitase amobil diperoleh dengan metode penjebakan menggunakan matriks alginat. Tujuan penelitian ini adalah untuk memperoleh informasi mengenai pengaruh penggunaan fitase amobil Bacillus subtilis HG pertama dan keempat pada jagung terhadap bioavailabilitas Cu dan Mg. Fitase yang digunakan merupakan ekstrak kasar dari isolat Bacillus subtilis HG. Rancangan penelitian yang digunakan adalah Post Test-Only Control Group Design. Tahapan penelitian: 1) analisis kadar fitat jagung dengan variasi bahan perendam jagung yaitu asam sitrat 9% (50 mL/50 gram jagung) selama 12 jam dan penambahan perendaman fitase amobil Bacillus subtilis HG pertama dan keempat pada jagung selama 30 menit. P1 adalah jagung tanpa bahan perendam (kontrol), P2 perendaman dengan asam sitrat kemudian fitase amobil 1, dan P3 perendaman dengan asam sitrat kemudian fitase amobil 4, 2) bioavailabilitas Cu dan Mg. Data yang diperoleh dianalisis dengan Anava satu arah (α= 0,05). Hasil: 1) ada pengaruh penggunaan asam sitrat dengan fitase amobil Bacillus subtilis HG pertama dan keempat pada jagung terhadap kadar fitat jagung. Hasil kadar fitat berturut-turut adalah 11,386; 4,089; dan 6,526 (mg/g), 2) bioavailabilitas Cu dari P1, P2 dan P3 secara berturut-turut adalah 95,85%; 96,02%; dan 94,59%. Bioavailabilitas Mg dari P1, P2 dan P3 secara berturut-turut adalah 95,59%; 93,99%; dan 92,40%. Kata kunci: alginat, fitase amobil, fitat, bioavailabilitas   Abstract. Generally the phytase enzyme was used in the free enzyme form and can be used only for one time, so it makes the cost of phytase enzyme production is expensive. One of the alternative way to solve this problem is using immobilized phytase because it can be used repeatly until many times. The immobilized phytase was made by trap method using alginate matrix. The purpose of this research is to get the information about the effect of usage the 1st and 4th immobilized phytase of Bacillus subtilis HG in corn to bioavailability of Cu and Mg. Phytase that used in this research is rough extract from Bacillus subtilis HG isolate. The research design is Post Test-Only Control Group Design. Phases of research: 1) analysis pytate concentration in corn with variation of soaking substance that was citric acid 9% (50 mL/50 gram corn) for 12 hours and additional of soaking the 1st and 4th immobilized phytase of Bacillus subtilis HG in corn for 30 minutes. P1 was corn without soaking substance (control), P2 was soaking by citric acid then the 1st immobilized phytase, and P3 was soaking by citric acid then the 4th immobilized phytase, 2) bioavailability of Cu dan Mg. The results were analized by One-way Anova (α= 0.05). The results : 1) there was the influence of the usage the citric acid with the 1st and 4th immobilized phytase of Bacillus subtilis HG in corn to the pytate concentration in corn. The pytate concentration was 11.386, 4.089, and 6.526 (mg/g), 2) Cu bioavailability of P1, P2, and P3 was 95.85%, 96.02%, and 94.59%. Mg bioavailability of P1, P2, and P3 was 95.59%, 93.99%, and 92.40%. Keywords: alginate, immobilized phytase, phytate, bioavailability

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