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Metode Spektrofotometri Secara Tidak Langsung untuk Penentuan Merkuri(II) berdasarkan Pembentukan Kompleks Biru Iodium-Amilum Hermin Sulistyarti; Erwin Sulistyo; Sutrisno Sutrisno; Zuri Rismiarti
ALCHEMY Jurnal Penelitian Kimia Vol 15, No 1 (2019): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.15.1.15036.149-164

Metode spektrofotometri secara tidak langsung telah dikembangkan untuk analisis merkuri(II) berdasarkan perbedaan absorbansi kompleks biru amilum-iodium antara larutan sampel yang mengandung ion merkuri(II) dan larutan blanko yang tidak mengandung ion merkuri(II) dalam sistem pereaksi yang berisi iodida, iodat dan amilum. Pada larutan blanko, semua ion iodida (I-) dalam sistem pereaksi dioksidasi oleh iodat menjadi iodium yang dengan adanya amilum membentuk kompleks biru iodium-amilum dan terdeteksi secara spektrofotometri pada 618 nm. Namun, bila sampel mengandung ion merkuri(II), maka sebagian ion iodida akan terikat oleh ion merkuri(II) dan membentuk kompleks tetraiodomerkurat(II), sehingga hanya sisa iodida yang dioksidasi oleh ion iodat menjadi iodium dan membentuk warna biru dengan absorbansi yang lebih rendah dibandingkan absorbansi larutan blanko. Hasil penelitian menunjukkan bahwa perbedaan absorbansi sebanding dengan konsentrasi iodida yang terikat pada ion merkuri(II) sehingga sebanding pula dengan konsentrasi merkuri(II) dalam sampel. Metode yang dikembangkan dioptimasi terhadap beberapa parameter kimia, antara lain konsentrasi larutan iodida, iodat, amilum, dan pH larutan dan pada kondisi optimum memberikan kisaran linier 1 – 9 mg L-1 ion merkuri(II) dengan R2 0,9983, dengan LOD 0,44 mgL-1. Metode ini cukup selektif terhadap ion kobalt(II) dan timbal(II), namun ion tembaga(II) dan perak(I) mengganggu pengukuran. Metode ini telah divalidasi menggunakan metode adisi standar yang diaplikasikan ke dalam sampel limbah pertambangan emas dari Lombok dengan hasil yang memuaskan.Indirect Spectrophotometry for Mercury(II) Determination Based on The Formation of Blue Starch-Iodine Complex. Indirect spectrophotometric method for determining mercury(II) concentration has been successfully developed based on the difference of the absorbance of the blue starch-iodine complex in the absence and in the presence of mercury(II). In the absence of mercury(II), all iodide ions (I-) in the reagent system are oxidized by iodate to iodine, which in the presence of starch formed a clear blue complex of starch-iodine detected spectrophotometrically at 618 nm. However, if mercury presents in the sample, some of the iodide ions are bound to mercury(II) ion forming tetraiodomercurate(II) complex, and thus, only the remaining of iodide is oxidized by iodate to iodine resulting in lower absorbance of the blue color. The results showed that the delta absorbance was proportional to the concentration of iodide bound to mercury and thus proportional to mercury(II) concentration. To achieve the sensitivity, the method was optimized to the main chemical parameters, such as the concentration of iodide, iodine, iodate, starch, and pH solution. Selectivity of the method was also studied by investigating the effect of interfering ions of copper(II), cobalt (II), lead(II), and silver (I). Under these optimum conditions, the method showed linearity measurements from 1 – 9 mg L-1 mercury(II) with correlation (R2) of 0.996. The method was also successfully applied to determine mercury(II) from small-scale gold mining tailing waste from West Lombok, Indonesia and is prospective for analysis of mercury(II) in mining waste.

Penentuan Kandungan Fenolik Total Liquid Volatile Matter dari Pirolisis Kulit Buah Kakao dan Uji Aktivitas Antifungi terhadap Fusarium oxysporum Mashuni Pallawagau; Nur Arfa Yanti; M. Jahiding; La Ode Kadidae; Wahyu Ahwarul Asis; Fitri Handayani Hamid
ALCHEMY Jurnal Penelitian Kimia Vol 15, No 1 (2019): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Kulit buah kakao (KBK) adalah limbah organik dari hasil olahan buah kakao yang dapat digunakan sebagai sumber senyawa aktif. Kulit kakao mengandung senyawa selulosa, hemiselulosa dan lignin yang dapat terdekomposisi menghasilkan senyawa fenolik. Penelitian ini bertujuan untuk menentukan kandungan fenolik total atau Total Phenolic Content (TPC) dari liquid volatile matter (LVM) hasil pirolisis KBK dan uji aktivitas antifungi terhadap Fusarium oxysporum. Produksi LVM dihasilkan dari metode pirolisis KBK pada suhu 500 °C. Penentuan TPC dengan metode spektrofotometri UV-Vis menggunakan pereaksi Folin- Ciocalteu (FC) pada panjang gelombang maksimum 765 nm dengan larutan standar asam galat dan diukur setelah dibiarkan selama 60 menit pada suhu kamar. Uji aktivitas antifungi terhadap F. oxysporum dilakukan dengan metode dilusi. LVM dari hasil pirolisis KBK adalah 25,80% (b/b) dengan TPC 100% sebesar 2,28 g/L. Pirolisis KBK menghasilkan LVM yang memperlihatkan aktivitas antifungi dengan konsentrasi hambat minimal (KHM) 1% (v/v) dan konsentrasi bunuh minimal (KBM) 9% (v/v). Oleh karena itu, LVM KBK memiliki potensi untuk diaplikasikan sebagai fungisida alami.Determination of The Total Phenolic Content of Liquid Volatile Matter from Cocoa Pod Husk Pyrolysis and Antifungal Activity Test Against Fusarium oxysporum. The cocoa pod husk (CPH) is an organic waste from the processed cocoa potentially used as source of active compounds. The CPH contains cellulose, hemicelluloses, and lignin compounds that can be decomposed into phenolic compounds. The present study investigated the determination of total phenolic content (TPC) of liquid volatile matter (LVM) of CPH followed by the antifungal activity test against Fusarium oxysporum. The LVM production was performed by the pyrolysis method at temperature of 500 °C. The determination of TPC was evaluated by the UV-Vis spectrophotometric method using the Folin-Ciocalteu (FC) reagent at maximum wavelength of 765 nm with the standart solution of gallic acid measured after 60 min reaction at room temperature. The antifungal activity test against F. oxysporum was carried out by dilution method. The pyrolysis of CPH produces LVM of 25.80% (b/b) contained TPC 100% of 2.28 g/L. The LVM produced in this study shows antifungal activity with a minimal inhibitory concentration (MIC) 1% (v/v) and minimum fungicidal concentration (MFC) 9% (v/v). Therefore, the LVM CPH produced can be applied as a natural fungicide.

Validasi Metode Penentuan Benzena, Toluena dan Xilena pada Sampel Udara dan Tanah Menggunakan Kromatografi Gas Panggabean, Aman Sentosa; Widyastuti, Tika; Hindryawati, Noor
ALCHEMY Jurnal Penelitian Kimia Vol 15, No 1 (2019): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Penelitian tentang validasi metode penentuan kadar benzena, toluena dan xilena pada sampel udara dan tanah dengan menggunakan kromatografi gas telah dilakukan. Untuk mendapatkan hasil pengukuran yang valid, beberapa parameter penting yang berpengaruh dalam validasi metode telah ditentukan. Beberapa parameter penting yang dilakukan adalah penentuan besaran dasar kromatografi yang meliputi: waktu retensi, kapasitas (k’), faktor selektivitas (α) dan kinerja analitik yang meliputi: penentuan linearitas (r), limit deteksi (LOD), limit kuantitasi (LOQ), presisi dan akurasi. Hasil penelitian penentuan kinerja analitik sangat baik ditunjukkan oleh nilai presisi sebagai % KV < 2/3 nilai KV Horwitz, LOD untuk masing-masing senyawa benzena, toluena dan xilena adalah 0,02 mg/L; 0,59 mg/L dan 0,08 mg/L serta LOQ untuk masing-masing senyawa benzena, toluena dan xilena adalah 0,07 mg/L; 1,99 mg/L dan 0,27 mg/L. Akurasi metode ini sangat baik ditunjukkan dengan nilai presentase perolehan kembali masing-masing senyawa benzena, toluena dan xilena untuk sampel tanah sebesar 102,61 ± 4,61%; 101,65 ± 7,41%; 102,15 ± 4,15%, dan untuk sampel udara masing-masing senyawa sebesar 101,69 ± 5,77%; 102,08 ± 5,43% dan 98,55 ± 5,11%. Berdasarkan hasil penelitian ini, metode kromatografi gas dapat digunakan dalam penentuan benzena, toluena dan xilena pada sampel udara dan tanah dengan memberikan hasil yang valid.Validation Method on The Determination of Benzene, Toluene and Xylene in Air and Soil Samples Using Gas Chromatography. The present study investigated the method for the determination of the content of benzene, toluene, and xylene in air and soil samples using gas chromatography. To obtain a valid measurement result, several important parameters that influence the method validation have been determined. The several important parameters carried out are the determination of the basic chromatographic such as retention time, capacity factor (k'), selectivity (α) and analytical performance measurement includes: the determination of linearity (r), limit of detection (LOD), limit of quantitation (LOQ), precision and accuracy. The result of analytical performance of the research are well verified, in which the value of precision was % CV < 2/3 CV Horwitz value, LOD for benzene, toluene, and xylene compound were 0.02 mg/L, 0.59 mg/L, 0.08 mg/L, respectively, and LOQ for benzene, toluene and xylene compounds was 0.07 mg/L, 1.99 mg/L and 0.27 mg/L respectively. This method achieved high accuration, indicated by a percentage of recovery value of benzene, toluene, and xylene for soil samples of 102.61 ± 4.61%; 101.65 ± 7.41%; 102.15 ± 4.15%, and for air samples was 101.69 ± 5.77%, 102.08 ± 5.43%, and 98.55 ± 5.11% respectively. Based on the results of this research, the method presented in this study can be applied for the determination of benzene, toluene, and xylene using gas chromatography in air and soil samples with valid results.

Pembuatan Ca-Mg-Al Hydrotalcite-like compound dari Brine Water untuk menjerap Cr(VI) Eddy Heraldy; Edi Pramono; Yohana Gita Aprilliaa
ALCHEMY Jurnal Penelitian Kimia Vol 15, No 1 (2019): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Pembuatan Ca-Mg-Al hydrotalcite-like compound (HTlc) dengan metode kopresipitasi telah dilakukan. Hydrotalcite-like yang terbentuk dikarakterisasi dengan X-ray Diffraction (XRD), Fourier Transform Infra Red (FTIR), Surface Area Analyzer (SAA) dan digunakan sebagai adsorben Cr(VI). Hasil karakterisasi XRD menunjukkan adanya nilai d 7,54 Å pada sudut 2 theta 11,73º yang merupakan ciri hydrotalcite dengan interlayer karbonat. Hasil ini diperkuat dengan adanya gugus hidroksi pada daerah bilangan gelombang IR sekitar 3441 cm-1 serta gugus karbonat pada 1361 cm-1. Proses adsorpsi Cr(VI) dengan menggunakan Ca-Mg-Al hydrotalcite-like menunjukkan kondisi optimum pada pH 3 dan waktu kontak 20 menit. Kinetika adsoprsi Cr(VI) oleh Ca-Mg-Al hydrotalcite-like cenderung mengikuti persamaan kinetika pseudo second order dan isoterm adsorpsinya mengikuti model isoterm Langmuir. Kapasitas adsorpsi maksimum Cr(VI) menggunakan Ca-Mg-Al hydrotalcite-like lebih besar dibandingkan menggunakan hydrotalcite komersial. Pita spektra FTIR setelah adsorpsi Cr(VI) menunjukkan ion kromium terserap ke dalam Ca-Mg-Al hydrotalcite-like compound.Synthesis of Ca-Mg-Al Hydrotalcite-like compound from Brine Water for Cr(VI) removal. The synthesis of Ca-Mg-Al hydrotalcite-like compound (Htlc) with a coprecipitation method had been done. Hydrotalcite-like product was characterized by X-ray diffraction (XRD), Fourier transform infra red (FTIR), surface area analyzer (SAA) and was used as an adsorbent of Cr(VI). The XRD characterization result indicates a value of d 7.54 Å at 2 theta 11.73º, which is a characteristic of hydrotalcite with carbonate interlayer. These results are confirmed by the presence of a hydroxy group at wavenumber of IR around 3441 cm-1 and carbonate groups in the 1361 cm-1. The adsorption of Cr(VI) using the Ca-Mg-Al hydrotalcite-like showed the optimum conditions at pH 3 and 20 minutes contact time. The adsorption kinetic of Cr(VI) by Ca-Mg-Al hydrotalcite-like tends to follow the pseudo second order equation and the adsorption isotherm tends to follow the Langmuir model. The maximum adsorption capacity of Cr(VI) using the Ca-Mg-Al hydrotalcite-like is greater than that of using commercial hydrotalcite. Morever, the FTIR spectra analyzed after Cr(VI) adsorption indicates that chromium ion was adsorbed into of Ca-Mg-Al hydrotalcite-like compound.

Pengaruh Pelapisan Kitosan-Nisin terhadap Kualitas Ikan Sidat (Anguilla bicolor bicolor) selama Masa Penyimpanan pada Suhu Rendah Triana Kusumaningsih; Tri Martini; Tika Diah Utami
ALCHEMY Jurnal Penelitian Kimia Vol 15, No 2 (2019): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Telah dilakukan penelitian mengenai preparasi dan karakterisasi pelapisan kitosan nisin terhadap kualitas ikan sidat (Anguilla bicolor bicolor) selama penyimpanan pada suhu rendah. Penyimpanan dilakukan selama 8 hari pada suhu 5 ± 2 °C. Nisin sebanyak (0, 2, 4, 6 dan 8 g) ditambahkan ke dalam larutan kitosan 1% (b/v), sehingga diperoleh lima larutan pelapis, yaitu kitosan 1,0% dan kitosan-nisin: 0,2; 0,4; 0,6 dan 0,8% (b/v). Pelapis kitosan-nisin optimal diketahui melalui pengamatan terhadap perubahan fisik daging. Tebal lapisan kitosan-nisin diamati menggunakan analisis SEM. Parameter yang diukur selama penyimpanan adalah nilai pH, nilai jumlah cemaran mikroba dengan metode Total Plate Count (TPC), kadar air, kadar lemak dan kadar protein. Hasil penelitian menunjukkan bahwa berdasarkan perubahan fisik selama penyimpanan, konsentrasi kitosan-nisin sebesar 0,6% (b/v) merupakan konsentrasi optimal untuk mempertahankan kualitas ikan sidat. Tebal lapisan kitosan-nissin adalah (0,529 − 0,554) mm. Ikan sidat terlapis kitosan-nisin mengalami penurunan kadar proksimat (air, lemak dan protein), peningkatan nilai pH dan jumlah cemaran mikroba yang lebih rendah dibandingkan ikan tanpa pelapisan. Hal tersebut menunjukkan bahwa pelapisan kitosan-nisin pada ikan sidat dapat mempertahankan kualitas ikan sidat selama penyimpanan pada suhu rendah.Effect of Chitosan-Nisin Coating on Quality of Eel (Anguilla bicolor bicolor) during the Storage Period at Low Temperature. The research of the preparation and characterization of chitosan-nisin as a coating layer on the eel (Anguilla bicolor bicolor) were studied. The quality of the eels after coating was observed during storage at low temperatures. The storage was carried out for 8 days at a temperature of 5 ± 2 °C. A various mass of nisin as much as (0, 2, 4, 6 dan 8 g) was added to 1% (b/v) chitosan solution, thus five coating solutions were obtained, namely 1.0% chitosan and chitosan-nissin 0,2; 0,4; 0,6 and 0,8% (w/v), respectively. The optimalization of chitosan-nisin coating was known through the observation of the physical changes of meat. The thickness of chitosan-nisin layer was observed using scanning electron microscopy (SEM) analysis. The parameters measured during storage are pH value, the amount of microbial contamination using the total plate count (TPC) method, water content, fat content and protein content. The results showed that based on the physical changes during storage, the concentration of chitosan-nisin of 0.6% (w/v) was the optimal concentration to maintain the quality of eel. The thickness of the chitosan-nissin layer was observed of 0.529 – 0.554 mm. Chitosan-nisin coated eel decreased proximate levels (water, fat and protein), increased pH value and lower amount of microbial contamination compared to fish without coating. These phenomena show that the chitosan-nisin coating can maintain the quality of eel during storage at low temperatures.

Penerapan Desain Eksperimen Plackett-Burman dan Box-Behnken pada Analisis Voltametri Pulsa Diferensial untuk Penentuan Kadar Senyawa Kompleks Gd-DTPA Santhy Wyantuti; Ravenna Aristantia; Yeni Wahyuni Hartati; Husein H Bahti
ALCHEMY Jurnal Penelitian Kimia Vol 16, No 1 (2020): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Gadolinium merupakan salah satu golongan unsur tanah jarang yang menarik karena memiliki sifat paramagnetik yang tinggi. Pengkhelatan gadolinium dengan ligan dietilentriaminpentaasetat (DTPA) menghasilkan senyawa yang berguna dalam bidang kesehatan. Tujuan dari penelitian ini adalah menentukan kandungan unsur tanah jarang gadolinium sebagai kompleks dengan ligan DTPA secara voltametri pulsa diferensial dengan penerapan desain eksperimen Plackett-Burman dan Box-Behnken. Desain eksperimen Plackett-Burman digunakan untuk menyeleksi parameter yang memiliki relevansi positif terhadap respon arus. Parameter yang terpilih kemudian dioptimasi melalui desain eksperimen Box-Behnken sehingga diperoleh kondisi optimum tiap parameter. Parameter yang terseleksi meliputi konsentrasi ligan DTPA, waktu deposisi dan waktu kesetimbangan dengan nilai tiap parameter pada kondisi optimum masing-masing yaitu 150, 13 mgL-1, 60 detik dan 30 detik. Berdasarkan hasil pengukuran pada kondisi optimum didapat nilai presisi dan akurasi untuk kompleks Gd-DTPA yaitu 99,79% dan 93,42% dengan nilai limit deteksi dan kuantisasi untuk kompleks Gd-DTPA yaitu 3,97 mg/L dan 10,71 mg/L. The Application of Experimental Designs of Plackett-Burman and Box-Behnken in Differential Pulse Voltammetry Analysis for Gd-DTPA Complex Detection. Gadolinium is one of rare earth elements that is interesting because it has high paramagnetic properties. The gadolinium chelating with diethylentriaminpentaacetic acid (DTPA) ligands produces useful compounds in the health field. The purpose of this experiment is to determine amount of gadolinium as complex with DTPA on differential pulse voltammetry by applying Plackett-Burman and Box-Behnken experimental design. The method employed experimental design of Plackett-Burman to select factors, which have positive relevance to response. The selected factors are optimized based on experimental design of Box-Behnken to obtain the optimum condition each factors. The selected factors are ligand concentration, deposition time and equilibrium time with optimum value of 150 mgL-1, 60 s and 30 s, respectively. Based on the result of measurement at optimum condition, the precision and accuracy value for Gd-DTPA complex is 99.79% and 93.42% with detection and quantization limit value for Gd-DTPA complex is 3.97 mg/L and 10.71 mg/L.

In-vivo Antipyretic Effect of Eel (Anguilla bicolor bicolor) Oil on Yeast-induced Fever on Mice Heru Sasongko; Aulia Ayu Rahmawati; Yeni Farida; Sugiyarto Sugiyarto
ALCHEMY Jurnal Penelitian Kimia Vol 15, No 2 (2019): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Fish oil has been studied for medicinal purposes, including its antipyretic properties. Eel (Anguilla bicolor bicolor) oil, which contains vitamins and fatty acids, including Omega-3 (EPA and DHA), is also expected to have the antipyretic effect. This research aimed to examine the antipyretic activity of eel oil on white mice (Mus musculus L.). An in-vivo study was done on thirty Swiss-Webster strain males mice that previously got 20% yeast-induced fever. Six treatments were applied including normal group (untreated), a negative control group (yeast-treated), a positive control group treated with acetaminophen (1.764 mg/20 g body weight), and three groups treated with eel oil (0.048, 0.096 and 0.192 g/20 g body weight, respectively). The data was analyzed statistically using one way ANOVA then was continued with LSD post hoc test. The results showed that eel oil has significantly reduced yeast-induced hyperthermia on mice five hours after application at doses 0.096 and 0.192 g/20 g body weight. Our finding suggests that eel oil possess antipyretic properties when was applied in certain doses, and this effect is presumably attributed to its high content of fatty acid, including EPA and DHA.

Optimasi dan Validasi Metode Penentuan Kadar Asam Glikolat dan Asam Laktat Dalam Krim Menggunakan Kromatografi Cair Kinerja Tinggi Devi Wulandari; Gusrizal Gusrizal; Titin Anita Zaharah
ALCHEMY Jurnal Penelitian Kimia Vol 16, No 1 (2020): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Telah dilakukan optimasi dan validasi metode penentuan asam glikolat dan asam laktat dalam krim menggunakan kromatografi cair kinerja tinggi. Pemisahan asam glikolat dan asam laktat dilakukan pada kolom fasa balik C-8menggunakan fasa gerak asam ortofosfat 0,1% dengan pH 3,5 dan detektor UV-Visible. Standar asam glikolat dan asam laktat dibuat dengan melarutkannya menggunakan asam ortofosfat 0,1% pH 3,5. Hasil eksperimen menunjukkan bahwa pada rentang konsentrasi 25 – 400 μg/mL, asam glikolat dan asam laktat memiliki kurva yang linear dengan koefisien korelasi masing-masing 0,9997 dan 0,9999. Uji presisi untuk larutan standar berkonsentrasi 100 µg/mL menghasilkan simpangan baku relatif sebesar 1,49% untuk asam glikolat dan 1,72% untuk asam laktat. Metode yang telah dioptimasi memberikan akurasi yang baik yang ditunjukkan oleh nilai perolehan kembali dari pengukuran tiga spiked sample dengan konsentrasi berbeda (50, 100, dan 150 μg/mL). Nilai perolehan kembali untuk masing-masing konsentrasi spiked sample adalah 97,12% ± 0,69; 98,76% ± 0,43; 100,80% ± 0,29 untuk asam glikolat dan 97,58% ± 0,39; 96,20% ± 0,68; 98,00% ± 0,38 untuk asam laktat. Batas deteksi dan batas kuantisasi untuk asam glikolat adalah 0,05 dan 0,17 μg/mL, sedangkan untuk asam laktat adalah 1,40 dan 4,67 μg/mL. Nilai kekasaran metode untuk asam glikolat pada hari pertama dan hari kedua adalah 1,43% dan 1,67%, sedangkan untuk asam laktat adalah 1,67% dan 1,25%. Metode yang telah dioptimasi dan divalidasi berpotensi untuk digunakan secara spesifik pada penentuan kadar asam glikolat dan asam laktat dalam krim.Optimization and Validation of Determination Methods of Glycolic Acid and Lactic Acid in Cream Using High-Performance Liquid Chromatography. A high-performance liquid chromatography analytical method for the determination of glycolic acid and lactic acid in creams has been optimized and validated. The separation was performed in a reverse phase C–8 column with a mobile phase of 0.1%, orthophosphoric acid at pH 3.5, and UV-Visible detector. The standard of glycolic acid and lactic acid was dissolved in 0.1% orthophosphoric acid at pH 3.5. The experimental results showed that in the concentration range of 25–400 μg/mL, glycolic acid and lactic acid showed a linear curve with a correlation coefficient of 0.9997 and 0.9999, respectively. The precision test for standard solutions containing 100 µg/mL resulted in a relative standard deviation of 1.49% for glycolic acid and 1.72% for lactic acid. The optimized method provided good accuracy indicated by the recovery of the measurement of three spiked samples in different concentrations (50, 100, and 150 μg/mL). The recovery for each concentration of the spiked sample was 97.12% ± 0.69; 98.76% ± 0.43; 100.80% ± 0.29 for glycolic acid and 97.58% ± 0.39; 96.20% ± 0.68; 98.00% ± 0.38 for lactic acid. The limit of detection and limit of quantization for glycolic acid was 0.05 and 0.17 μg/mL, and for lactic acid was 1.40 and 4.67 μg/mL. The ruggedness of the method for glycolic acid on the first day and second day was 1.43% and 1.67%, while for lactic acid, it was 1.67% and 1.25%. The method that has been optimized and validated shows the potential to be used specifically for the determination of glycolic acid and lactic acid in the cream.

The Temperature Effect on Ultrasonic-assisted of Synthesis Methyl Ferulate and Its Antiplatelet Assay Juni Ekowati; Rian Putra Pratama; Kholis Amalia Nofianti; Nuzul Wahyuning Diyah
ALCHEMY Jurnal Penelitian Kimia Vol 15, No 2 (2019): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Ferulic acid (FA) has been reported to have antiplatelet activity through indirectly inhibiting P2Y12 receptor. In order to increase the activity of FA, by improving its lipophilicity, so that it is easier to enter the cell, synthesis methyl ferulate was conducted through Fisher esterification. Ultrasonic waves were utilized as source of energy emitted through water as the medium at two various of temperature, i.e., 55 °C and 65 °C. The purposes of this study are to produce methyl ferulate and to determine the reaction constant rate (k) and its energy activation (Ea), at temperature of 55 °C and 65 °C. Moreover, the biological activity as antiplatelet was investigated at dose 20 mg/kg BW. The antiplatelet assay was conducted by clotting time and bleeding time methods. The results were analyzed by one way ANOVA program (P<0.05). The yield of methyl ferulate are 50.3% and 67.1% at 55 °C and 65 °C, respectively. The k value at 55°C is 4x10-5 cons-1min-1, while that of at 65 °C is 9x10-5 cons-1min-1. The clotting time and bleeding time of methyl ferulate obtained were 265 sec and 175 sec, respectively. The antiplatelet activity of methyl ferulate is better than ferulic acid.

Optimasi dan Validasi Metode Kromatografi Cair Kinerja Tinggi untuk Menetapkan Kadar Asam Klorogenat dalam Ekstrak Etanol Daun Yakon (Smallanthus sonchifolius (Poepp. & Endl.) H. Robinson) Aziz, Zuhelmi; Nurhidayati, Liliek; Abdillah, Syamsudin; Yuliana, Nancy Dewi; Simanjuntak, Partomuan
ALCHEMY Jurnal Penelitian Kimia Vol 16, No 1 (2020): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Yakon merupakan tanaman yang dapat digunakan untuk pengobatan dan kebutuhan pangan. Salah satu kandungan zat berkhasiat dalam daun yakon adalah asam klorogenat. Asam klorogenat diketahui memiliki aktifitas sebagai antioksidan, antikanker dan antidiabetes. Penentuan kadar asam klorogenat dalam matriks yang kompleks diperlukan metode yang selektif dengan ketelitian dan ketepatan yang baik. Pada penelitian ini dilakukan optimasi dan validasi metode kromatografi cair kinerja tinggi (KCKT) fase balik untuk penetapan kadar asam klorogenat. Ekstrak dibuat secara ultrasonikasi menggunakan pelarut etanol 95%. Kondisi optimum diperoleh menggunakan fase gerak asam format 0,1% dalam asetonitril–asam format 0,1% dalam air (gradien); fase diam oktadesilsilan (C18) pada suhu 30 ºC dan detektor UV pada panjang gelombang 328 nm. Metode KCKT ini memberikan hasil yang memiliki ketelitian yang tinggi dengan simpangan baku relatif 0,79% dan ketepatan yang baik dengan perolehan kembali 97,50%. Kadar asam klorogenat yang diperoleh dalam ekstrak etanol 95% daun yakon sebesar 1,02%. Optimization and Validation of High Performance Liquid Chromatography Methods for Determination of Chlorogenic Acid Levels in Ethanol Extracts of Yakon Leaves (Smallanthus sonchifolius (Poepp. & Endl.) H. Robinson). Yacon is a plant that can be used for medication and food needs. One of the bioactive compounds of yacon leaves is chlorogenic acid. Chlorogenic acid has various biological activities, such as antioxidant, anticancer and antidiabetic activities. To determine the chlorogenic acid in such complex matrix, such selective methods with good precision and acuracy are required. In this study, the optimization and validation of reverse phase high performance liquid chromatography (HPLC) method for chlorogenic acid determination were performed. The extract was prepared by ultrasonication in 95% ethanol.The optimized condition for HPLC obtained was by using mobile phase 0.1% formic acid in acetonitrile – 0.1% formic acid in water with gradient elution, stationary phase octadesylsilane (C18) at 30 oC and UV detector at of 328 nm. The result showed that HPLC method had high precicion with relative standard deviation of 0.79% and high accuracy with recovery of 97.50%. The chlorogenic acid in the ethanol 95% extract of Yacon leaves was 1,02%.

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M. Widyo Wartono

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alchemymipauns@gmail.com

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Kota surakarta,

Jawa tengah

INDONESIA

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Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name M. Widyo Wartono

Contact Email widyo@mipa.uns.ac.id

Phone -

Journal Mail Official alchemymipauns@gmail.com

Editorial Address -

Location Kota surakarta, Jawa tengah INDONESIA

Abstract

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Contact Name
M. Widyo Wartono

Contact Email
widyo@mipa.uns.ac.id

Phone
-

Journal Mail Official
alchemymipauns@gmail.com

Editorial Address
-

Location
Kota surakarta,

Jawa tengah

INDONESIA