Wulan Tri Wahyuni
Departemen Kimia, Fakultas Matematika Dan Ilmu Pengetahuan Alam; Pusat Studi Biofarmaka Tropika, Lembaga Penelitian Dan Pengabdian Kepada Masyarakat, Institut Pertanian Bogor

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Pembuatan Recycle Screen Printed Carbon Electrode dan Aplikasinya untuk Deteksi Asam Galat dengan Teknik Voltammetri Wulan Tri Wahyuni; Rany Zalvianita; Rudi Heryanto
Jurnal Kimia Sains dan Aplikasi Vol 22, No 5 (2019): Volume 22 Issue 5 Year 2019
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3056.934 KB) | DOI: 10.14710/jksa.22.5.164-172

Abstract

Gallic acid is phenolic compound found in tea and act as antiradical agent. This compound is electrochemically active and could be detected using voltammetric technique. This study aims to obtain recycle screen printed carbon electrode (rSPCE) and applied it for voltammetric detection of gallic acid. rSPCE was prepared by modification of used SPCE working electrode using a mixture of graphite:polystyrene at ratio of 95:5, 90:10, and 85:15 (w/w). Graphite:polystyrene was suspended in chloroform and deposited on SPCE by drop casting method. Phosphate buffer 0.1 M at pH of 2.5, 3.5, and 7 were used as electrolyte solution in voltammetric detection of gallic acid. The optimum condition of gallic acid detection was obtained when phosphate buffer 0,1 M at pH of 2.5 and rSPCE in composition of graphite:polystyrene (95:5) used as electrolyte and working electrode, respectively. Gallic acid has 2 oxidation peaks at potential of 0.26 V and 0.63 V vs Ag/AgCl, respectively. At concentration of 1 – 5 mM, gallic acid and oxidation currents provide linear regression with the coefficient determination of 0.9947 and 0.9864, consecutively for peak number 1 and 2. Measurement of gallic acid at rSPCE 95:5 shows good precision with %RSD < 5%. rSPCE was successfully applied for voltammetric detection of gallic acid in standard solution with accuracy > 96%, however further development is needed before its application for gallic acid measurement in real sample such as tea extract.
FABRICATION AND ANALITICAL PERFORMANCE EVALUATION OF CARBON PASTE ELECTRODE USING CYCLIC VOLTAMMETRY Wulan Tri Wahyuni; Latifah K Darusman; Desi Herliani
Analit: Analytical and Environmental Chemistry Vol 2, No 2 (2017): Analit: Analytical and Environmental Chemistry
Publisher : Universitas Lampung Jl. Prof. Dr. Sumatri Brojonegoro No.1 Bandar Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/aec.v2i2.2017.p

Abstract

Penelitian ini bertujuan mengembangkan metode pembuatan Elektrode Pasta Karbon (EPK) yang memberikan respon voltammetri yang optimum serta menguji kinerjanya menggunakan larutan K3[Fe(CN)6] secara voltammetri siklik. Parameter yang dioptimasi meliputi nisbah komposisi grafit dan parafin, pemanasan grafit, sonikasi campuran grafit dan parafin, waktu penggerusan, dan lama penyimpanan EPK sebelum digunakan. Respons terbaik diperoleh saat EPK dibuat dengan nisbah campuran grafit dan parafin sebesar 7 : 3 dan grafit yang dipanaskan terlebih dahulu pada suhu 105 C selama 2 jam. Campuran grafit dan parafin terbaik diperoleh setelah sonikasi selama 30 menit dan waktu penggerusan selama 45 menit. EPK yang disimpan 2 hari sebelum digunakan menghasilkan respons terbaik. Pengukuran K3[Fe(CN)6] pada rentang konsentrasi 0,1 – 125 mM menunjukkan respon linear dengan koefisien determinasi (R2) sebesar 0,9998 dan 0,9991, masing-masing untuk arus puncak oksidasi dan reduksi dengan simpangan baku relatif (%SBR) sebesar 2,0% pada reaksi oksidasi dan 1,07% pada reaksi reduksi. EPK yang dihasilkan menunjukkan  stabilitas yang baik pada pemakaian selama 7 hari berturut-turut dan 96 kali pengukuran
Deteksi Kurkumin dan Bisdemetoksikurkumin dengan Teknik Voltammetri Menggunakan Elektrode Boron-Doped Diamond Wahyuni, Wulan Tri; Darusman, Latifah Kosim; Diksy, Yuris
ALCHEMY Jurnal Penelitian Kimia Vol 14, No 2 (2018): Vol 14, No 2 (2018): Alchemy Jurnal Penelitian Kimia
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.14.2.19576.253-266

Abstract

Pada penelitian ini metode deteksi kurkumin dan bisdemetoksikurkumin dikembangkan dengan teknik voltammetri siklik menggunakan elektrode boron-doped diamond. Voltammogram siklik kurkumin dan bisdemetoksikurkumin dalam larutan elektrolit tetrabutilamonium heksafluorofosfat (TBAPF6)-asetonitril masing-masing menunjukkan 2 puncak oksidasi, yaitu pada potensial +0,4 V dan +1,9 V vs. Ag/AgCl untuk kurkumin, serta +0,6 V dan +2,0 V vs. Ag/AgCl untuk bisdemetoksikurkumin. Hubungan linear diperoleh antara konsentrasi kurkumin maupun bisdemetoksikurkumin dengan arus puncak oksidasinya. Hubungan linear  yang diperoleh adalah I(µA) = 8619,9C (M) + 0,7285 (R2=0,9995) dan I(µA) = 14658C (M) + 16,388 (R2=0,9299) berturut-turut untuk kurkumin puncak pertama dan kedua, serta I(µA) = 7953,2C (M) + 5,3977 (R2=0,9871) dan I(µA) = 5807,7 C (M) + 7,7616 (R2=0,9981) untuk bisdemetoksikurkumin puncak pertama dan kedua. Aplikasi metode yang dikembangkan terhadap sampel buatan yang mengandung campuran kurkumin dan bisdemetoksikurkumin menghasilkan 3 puncak oksidasi pada potensial +0,3 V, +1,2 V, dan +2,0 V vs Ag/AgCl mengindikasikan terjadinya tumpang tindih antara puncak kurkumin dan BDMC serta pergeseran puncak oksidasi. Nilai presisi pengukuran dengan metode yang dikembangkan ialah 15,86 dan 15,15% untuk kurkumin, serta 9,85 dan 31,47% untuk bisdemetoksikurkumin. Sementara nilai akurasi pengukuran ialah sebesar 96,69 dan 125,36% untuk kurkumin, serta 97,95 dan 127,54% untuk bisdemetoksikurkumin masing-masing berdasarkan puncak 1 dan 2. Hasil yang diperoleh menunjukkan performa analitik metode yang dikembangkan masih perlu ditingkatkan sebelum diaplikasikan untuk analisis kuantitatif.Detection of Curcumin and Bisdemetoxycurcumin by Voltammetric Technique using a Boron-Doped Diamond Electrode.  This study develops a cyclic voltammetry method for simultaneous detection of curcuminoid by using boron-doped diamond electrode. Curcumin and bisdemethoxycurcumin (BDMC) in tetrabutylammonium hexafluorophosphate (TBAPF6)-acetonitrile as electrolyte solution showed two oxidation peaks at +0.4 V and +1.9 V for curcumin, while those for BDMC appeared at +0.6 V and +2.0 V. Reduction peaks of both standards were not observed. In the optimum conditions, this method showed linear correlation between concentration of curcumin and BDMC with it’s oxidation peak current. The equations of I(µA) = 8619.9(C) (M) + 0.7285 (R2=0,9995) and I(µA) = 14658(C) (M) + 16.388 (R2=0.9299) were obtained for curcumin, I(µA) = 7953.2(C) (M) + 5.3977 (R2=0,9871) and I(µA) = 5807.7(C) (M) + 7.7616 (R2=0.9981) for BDMC. Meanwhile, the measurement of the artificial samples containing a mixture of curcumin and BDMC showed three oxidation peaks at +0.3 V, +1.2 V, and +2.0 V. This result indicated an overlapping between curcumin and BDMC peaks and peak shifting. Precision of the developed method was expressed as percent RSD, giving value of 15.86 and 15.15% for curcumin, and 9.85 and 31.47% for BDMC. The accuracy was 96.69 and 125.36% for curcumin, meanwhile for BDMC was 97.95 and 127.54% for peak 1 and 2. The result indicated that the method required further improvement before applied for quantitative analysis.
Antibacterial and Antibiofilm Activity of Daemonorops draco Resin Wahyuni, Wulan Tri; Purwanti, Sri; Batubara, Irmanida
Biosaintifika: Journal of Biology & Biology Education Vol 10, No 1 (2018): April 2018
Publisher : Department of Biology, Faculty of Mathematics and Sciences, Semarang State University . Ro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/biosaintifika.v10i1.13554

Abstract

Daemonorops draco has been reported for its antibacterial activity and empirically used for wound healing by Anak Dalam ethnic at Jambi Province, Sumatera-Indonesia. This study was performed to evaluate antibacterial and antibiofilm activity of D. draco resin collected from Jambi. D. draco resin was extracted using n-hexane, ethyl acetate and methanol, respectively. Antibacterial activity of the extracts was evaluated using agar diffusion method against Staphylococcus aureus and Eschericia coli, whereas the minimum inhibitory concentration (MIC) and minimum bacteriacidal concentration (MBC) was determined by microdilution method. In addition, antibiofilm activity was evaluated by violet crystal method. The result showed that extraction yield of ethyl acetate was higher than methanol and n-hexane. Ethyl acetate and methanol extracts of D. draco exhibited stronger antimicrobial activity against S. aureus compare to n-hexane extract. MIC and MBC of methanol extract and chromatographic fraction (F5.1) of ethyl acetate extract were 0.5 and 1.0 mg/mL, respectively. In addition, antibiofilm assay revealed that all extracts were inhibit initial attachment of bacteria cell in biofilm formation. This result revealed a novel information that  D. draco extracts was potential as inhibitor of biofilm formation. TLC bioautography of D. draco extracts indicated that constituent with Rf of 0.71 performed antimicrobial activity against S. aureus. This finding expected to strengthen the scientific backup for utilization of D. draco by society.
Efektivitas Krim Anti Jerawat Kayu Secang (Caesalpinia sappan) Terhadap Propionibacterium acnes pada Kulit Kelinci SITI SA’DIAH; LATIFAH KOSIM DARUSMAN; WULAN TRIWAHYUNI; IRMANIDA BATUBARA
JURNAL ILMU KEFARMASIAN INDONESIA Vol 11 No 2 (2013): JIFI
Publisher : Fakultas Farmasi Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (719.927 KB)

Abstract

Sappan Wood extract (Caesalpinia sappan) is potential as an anti-acne due to its ability as an antioxidant, lipase inhibitor and anti Propionibacterium acnes. The potency is influenced by the quality of simplicia and extracts. To elevate the application, semisolid dosage formulations were made in cream forms using a standardized extract of Sappan Wood. Creams were formulated with the same base composition but different extract concentrations (range of 1-10%). In vivo assay were carried out on rabbit skin induced by intradermal injection of P. acnes. Sappan Wood was collected from Semarang and the resulting extract has met the Materia Medika Indonesia requirement with brazilin level in extract of 224.675 mg / g. In vivo tests showed that all Sappan Wood extract formulations have potency as anti-acne as indicated by curative percentage for 15 days were significantly different from the formula base. Curative effect of all formula were not significantly different with the Mediklin® positive control. Formula with the lowest concentration of the extract was the most effective and efficient with the curative percentage of more than 96% in 15 days.
Metode Ekstraksi dan Pemisahan Optimum Untuk Isolasi Xantorizol dari Temulawak (Curcuma xanthorrhiza) Wulan Tri Wahyuni; Herdiyanto Herdiyanto; Mohamad Rafi
Jurnal Jamu Indonesia Vol. 2 No. 2 (2017): Jurnal Jamu Indonesia
Publisher : Pusat Studi Biofarmaka Tropika LPPM IPB; Tropical Biopharmaca Research Center - Bogor Agricultural University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (981.946 KB) | DOI: 10.29244/jji.v2i2.31

Abstract

Xantorizol merupakan senyawa penciri utama temulawak (Curcuma xanthorrhiza). Penelitian ini bertujuan menentukan metode ekstraksi dan pemisahan optimum untuk isolasi xantorizol dari rimpang temulawak. Maserasi dan sokletasi digunakan untuk mengekstraksi xantorizol dengan pelarut metanol, dietil eter, dan n-heksana. Pemisahan dilakukan dengan kromatografi kolom dan kromatografi lapis tipis (KLT) preparatif dan hasil pemisahan dikarakterisasi berdasarkan spektrum inframerah dan kromatografi gas-spektrum massa (KG-SM), sementara persentase kemurniannya ditentukan dengan kromatografi cair kinerja tinggi. Ekstrak n-heksana dari teknik maserasi memiliki kandungan xantorizol lebih tinggi dibanding ekstrak lainnya yaitu sebesar 168 mg/g sampel. Fraksi ke-4 hasil pemisahan kolom terhadap ekstrak n-heksana memberikan dua spot pada KLT dengan Rf 0.54 dan 0.68, spot dengan Rf 0.54 diduga merupakan xantorizol (dikonfirmasi dengan KG-SM). Pemurnian lebih lanjut dengan KLT preparatif terhadap fraksi ke-4 menghasilkan xantorizol dengan rendemen sebesar 0.016 % berdasar bobot sampel dan tingkat kemurnian sebesar 87.40 %.
Enhanced Ethanol Production by High Temperature-Tolerance Mutant Pichia kudriavzevii T-T2 in various Carbon and Nitrogen Sources Monica Ina Martha; Rika Indri Astuti; Wulan Tri Wahyuni
Microbiology Indonesia Vol. 14 No. 2 (2020): June 2020
Publisher : Indonesian Society for microbiology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5454/mi.14.2.3

Abstract

Previously, we had constructed proline accumulating Pichia kudriavzevii yeast mutant (T-T2) that exhibited high temperature tolerance phenotype. In this study we then analyzed the ethanol production of the particular mutant isolate in various carbon (C) and nitrogen sources (N). Fermentation rate of T-T2 either in 4% glucose or substrate mixture (SM = 2%glucose : 2% xylose) was higher than WT strain. The highest CO2 evolving rate by T-T2 in glucose and SM was 57.0 ml/hour and 51.4 ml/hour, respectively, suggesting that T-T2 was capable of using xylose as C-source. T-T2 resulted significant increase of total evolved CO2 than WT strain in glucose as substrate. T-T2 isolate was capable of producing higher ethanol than its WT strains in various C-sources, including glucose, maltose, sucrose, xylose and SM. However, glucose was found as the most preferable C-source to produce ethanol (3.2%) whereas maltose was the least preferable one. T-T2 was found capable in using inorganic sources (NaNO3) to produce ethanol (2.4%) as compared to other N-sources (urea, (NH4)2SO4, NH4Cl). Ethanol production by T-T2 strain in NaNO3 was 16% higher than its WT strain. This data indicate, that NaNO3 is potentially applied as N source alternative to produce ethanol. Based on our study, mutant strain T-T2 shows higher fermentation rate than its WT strain in various sugar and N-sources. The fact that T-T2 could produce ethanol from SM in a similar fermentation rate to single glucose as substrate, suggesting its potential application in the 2nd generation of bioethanol productions.
A Brief Review on Fabrication of Screen-Printed Carbon Electrode: Materials and Techniques Wulan Tri Wahyuni; Budi Riza Putra; Achmad Fauzi; Desi Ramadhanti; Eti Rohaeti; Rudi Heryanto
Indonesian Journal of Chemical Research Vol 8 No 3 (2021): Edition for January 2021
Publisher : Jurusan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598//ijcr.2021.7-wul

Abstract

Screen-printed carbon electrode (SPCE) is one of the most interesting designs to combine a working (from carbon based material), reference, and counter electrode in a single-printed substrate. SPCE has been used in many electrochemical measurements due to its advantages for analysis in microscale. This paper summarises the main information about SPCE fabrication from the material and fabrication technique aspect on the flat substrate based on the work that has been published in the last 30 years. The success of SPCE fabrication is highly dependent on the composition of conductive ink which consists of conductive materials, binder, and solvents; substrate; and fabrication techniques. Among the carbon-based materials, the most widely used for SPCE fabrications are graphite, graphene, and carbon nanotubes. The frequent binder used are polymer-based materials such as polystyrene, polyaniline, poly 3,4-ethylenedioxythiophene:polystyrene sulfonate (PEDOT:PSS), and polyvinyl chloride. The solvents used for SPCE fabrication are varied including water and various organic solvents. The main characteristics of the SPCE substrate should be inert in order to avoid any interferences during electrochemical measurements. The screen printing and inkjet printing technique are preferred for SPCE fabrication due to easy fabrication and the possibility for mass production of SPCE.
ANALISIS KADAR FLAVONOID DAN ANTIOKSIDAN EKSTRAK DAUN KENIKIR (Cosmos caudatus), RUMPUT MUTIARA (Oldenlandia corymbosa), DAN SIRSAK (Annona muricata) DENGAN TEKNIK SPEKTROMETRI Wulan Tri Wahyuni; Latifah K Darusman Pitria; Apriliani Rahmat
Analit: Analytical and Environmental Chemistry Vol 3, No 1 (2018): Analit: Analytical and Environmental Chemistry
Publisher : Universitas Lampung Jl. Prof. Dr. Sumatri Brojonegoro No.1 Bandar Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/aec.v3i1.2018.p

Abstract

Pada penelitian ini dilakukan analisis kadar senyawa flavonoid dan penentuan aktivitas antioksidan dari ekstrak etanol daun kenikir (Cosmos caudatus), rumput mutiara (Oldenlandia corymbosa), dan sirsak (Annona muricata) dengan teknik spektrometri. Ekstrak masing-masing sampel diperoleh melalui ekstraksi dengan bantuan gelombang ultrasonik. Kadar flavonoid ditentukan dengan teknik spektrometri menggunakan kuersetin sebagai standar, sementara aktivitas antioksidan dievaluasi melalui penangkapan radikal bebas 2,2-diphenyl-1-picrylhydrazyl (DPPH). Hasil yang diperoleh menunjukkan bahwa rendemen ekstraksi daun sirsak lebih tinggi dibandingkan rumput mutiara dan kenikir. Ekstrak etanol sirsak memiliki aktivitas penangkapan radikal bebas DPPH terbaik dengan nilai IC50 sebesar 37.91 µg/mL. Kadar flavonoid total dari ekstrak etanol sirsak tersebut ialah sebesar 1.78 mg ekuivalen kuersetin/mg sampel, lebih rendah dibandingkan kadar flavonoid rumput mutiara dan kenikir. Hasil ini mengindikasikan bahwa aktivitas antioksidan pada ekstrak daun sirsak dimungkinkan tidak hanya berasal dari flavonoid, namun berasal dari gabungan senyawa flavonoid dengan senyawa aktif lain yang dikandungnya DOI: http://dx.doi.org/10.23960/aec.v3.i1.2018.p38-46
Quantitative Analysis of Multi-components in Curcuma xanthorrhiza by Single Marker Badrunanto Badrunanto; Wulan Tri Wahyuni; Mohamad Rafi
Indonesian Journal of Pharmacy Vol 30 No 4, 2019
Publisher : Faculty of Pharmacy Universitas Gadjah Mada, Yogyakarta, Skip Utara, 55281, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14499/indonesianjpharm30iss4pp285

Abstract

A new simple and effective routine analytical method for quantification of curcuminoids in Curcuma xanthorrhiza was developed by high-performance liquid chromatography. This method based on chromatographic fingerprint combined with a quantitative analysis of multi-components by single marker (QAMS). Curcumin was selected as an internal marker for the determination of two other similar compounds, i.e. bisdemethoxycurcumin and demethoxycurcumin, by using the relative coefficient factor (RCF). Excellent linearity was obtained for each component (r2 > 0.9998), and the recovery of extraction methods were within 100.23-103.95%. The precision of the method was good at inter-day and intra-day analysis (RSD < 4.0%). The stability of RCFs was good under various chromatographic conditions with RSD < 1%, and the ratio of retention time was used to locate each compound. The quantification of curcuminoids between QAMS and external standard method (ESM) proved the consistency and similarity of the two method (RSD < 2%). This study demonstrated that QAMS could be used as a routine method for quality control of curcuminoids in C. xanthorrhiza. This method successfully proved accurate, stable, more effective and simple than external standard method.