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All Journal Jurnal Ilmu Dasar BERKALA SAINSTEK Alchemy Jurnal Penelitian Kimia UNEJ e-Proceeding PengabdianMu: Jurnal Ilmiah Pengabdian kepada Masyarakat Indonesian Chimica Letters InSTEM

Yeni Maulidah Muflihah

Jurusan Kimia, Fakultas MIPA Universitas Jember

Author-ID : 2976081

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Economics, Econometrics & Finance Education Energy Environmental Science Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Physics Public Health Social Sciences Other

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BATCH INJECTION POTENTIOMETRY ASAM ASPARTAT, ASAM GLUTAMAT DAN ARGININ MENGGUNAKAN ELEKTRODA TUNGSTEN OKSIDA Muflihah, Yeni Maulidah; Masruroh, Heny; Zulfikar, Zulfikar
Alchemy Jurnal Penelitian Kimia Vol 10, No 1 (2014)
Publisher : Alchemy Jurnal Penelitian Kimia

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The presence of aspartic acid, glutamic acid and arginine in solution can be detected by potentiometric method using tungsten oxide electrode in a batch system. Characterization of tungsten oxide electrode used include linear range, limit of detection, sensitivity and reproducibility. Buffer type and concentration effect also studied to optimize the measurement results. Optimum conditions for detecting arginine was at pH 6.0 with a phosphate buffer concentration of 0.5 x 10-3Â M. Correlation coefficient was obtained for 0.9864, the detection limit of 5.24 x 10-6Â M, sensitivity 16.1 mV/decade with reproducibility 0 â7 %. Glutamic acid has a correlation coefficient of 0.9789, the detection limit of 3.80 x 10-6Â M, the sensitivity of 9.2 mV/decade and reproducibility of 0 â 6 %. Aspartic acid has a correlation coefficient of 0.9949, the detection limit of 7.76 x 10-6Â M, sensitivity of 13.4 mV/decade and reproducibility of 0 â 5 %.

High Performance Liquid Chromatography of Amino Acids Using Potentiometric Detector With A Tungsten Oxide Electrode Yeni Maulidah Muflihah; Zulfikar Zulfikar; Siswoyo Siswoyo; Asnawati Asnawati; Qurrota Ayun
UNEJ e-Proceeding 2016: Proceeding The 1st International Basic Science Conference
Publisher : UPT Penerbitan Universitas Jember

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High Performance Liquid Chromatography (HPLC) method combine with potentiometric detector was applied as a method for analysis of amino acids (aspartic acid, glutamic acid and arginine). The separation was carried out on a C18 column with isocratic elution of a mixture of acetonitrile and phosphat buffer. Potentiometric detector using a tungsten oxide electrode as working electrode and Ag/AgCl as refference electrode. The detection method was based on the presence of H+ ions from amino acids. This application was a development of previous studies that was succesfully applied to detect the presence of amino acids in batch and flow systems. Amino acid determination was characterized by its retention time. Retention time of aspartic acid, glutamic acid and arginine were as follow: 8,46; 13,0; and 15,21 minutes. The optimized separation conditions obtained at a flow rate of 1,2 mL/min with 15% acetonitrile concentration, buffer pH 6,5 with phosphat concentration of 5x10-4 M. Detector performance tested by the recovery test of samples, and the results obtained for glutamic acid, aspartic acid and arginine respectively: 89,1%, 94,9%, and 110%. Linear range obtained at 10-3 M to 10-7 M. Detection limit were 1,58x10-7 M for glutamic acid, 6,58x10-8 M for aspartic acid and 6,51x10-8 M for arginine.

FLOW INJECTION POTENTIOMETRIC ANALYSIS OF ASPARTIC ACID, GLUTAMIC ACID AND ASCORBIC ACID USING PLATINUM ELECTRODES Yeni Maulidah Muflihah; Siswoyo Siswoyo; Tanti Haryati; Kiki Puji Setianingrum
Jurnal ILMU DASAR Vol 13 No 1 (2012)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

The presence of weak acids in solution can be detected using a potentiometric detector. Platinum was used as a working electrode and Ag/AgCl as a reference electrode. Ascorbic, glutamic and aspartic acid were detected by a platinum electrode in a flow potentiometric system. The influence of pH, flow rate and concentration of phosphate buffers asa a carrier were studied and showed an optimum pH for the detection of ascorbic and glutamic acid at pH 6,5 and pH 7,0 for aspartic acid. Phosphate buffer concentration optimum at 1x10-4M and flow rate of 1,00 mL/min. Linear range for ascorbic and glutamic acid at 2,5 x10-4M to 5x10-2M, with a regression coefficient of 0,974 and 0,958, while for aspartic acid 5x10-4M to 5x10-2M with a regression coefficient 0,911. Detection limit for ascorbic and glutamic acids were 5x10-4M and 1x10-3M for aspartic acid. Sensor reproducibility obtained from variation coefficient (Kv). Variation coeffiecient (Kv) of ascorbic acids 1,32-1,69%, glutamic acids 0,69- 1,57% and aspartic acid 0,54- 1,29%.

The Application of Slow Sand Filtration Technology for Improving Water Quality at Taman Gading Housing Area, Kaliwates District, Jember Muflihah, Yeni Maulidah; Utomo, Denny Trias; Handayani, Wuryanti; Sulistiyo, Yudi Aris; Andarini, Novita; Asnawati, Asnawati; Indarti, Dwi
Jurnal Inovasi Sains dan Teknologi untuk Masyarakat Vol. 1 No. 2 (2023): November
Publisher : Faculty of Mathematics and Natural Sciences, University of Jember. Jl. Kalimantan No.37, Krajan Timur, Jemberlor, Kec. Sumbersari, Jember Regency, East Java 68121

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/instem.v1i2.470

Water is a basic need for all living organisms. Water quality implies living quality. Several parameters influencing water quality include minerals, dissolved organic substances, and turbidity. The water consumed must meet proven water quality standards. However, water quality still needs to be improved in several areas before consumption. The well water in residential areas placed on rice fields generally needs to meet the requirements for consumption. Many Taman Gading housing complex residents, especially in RW 036 RT 006, still use the well water to meet their daily needs. The well water quality in this area tends to be smelly and somewhat misty. Proper treatment is needed to improve the quality of well water in this area to reduce the negative impact on the population's health in the long term. This training focused on well water purification and filtration using slow sand filtration technology (SPL) to improve water quality. This method uses activated charcoal, sand, gauze, and pumice as filter media in specific proportions. The use of this method is effective and efficient in reducing the turbidity level of the sample water to the threshold for drinking water (<500 ppm), with a neutral pH (close to 7.00). This technology is effortless for residents to use and apply independently at a relatively low cost.

The Permeation of High Concentration Hydrogen Sulfide (H2S) Gas Using PTFE (Polytetrafluoroethylene) and PVDF (Polyvinylidene Fluoride) membranes Asnawati, Asnawati; Diah Ayu Nur Sholehah; Dwi Indarti; Tri Mulyono; Bambang Piluharto; Muflihah, Yeni Maulidah
Indonesian Chimica Letters Vol. 1 No. 2 (2022)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Jember

Hydrogen sulfide (H2S) is a toxic, corrosive, and flammable gas. The presence of H2S gas can be reduced by a permeation method using PTFE (Polytetrafluoroethylene) membranes and PVDF (polyvinylidene fluoride) membranes. This H2S gas passed through the membrane and was then captured by the SAOB (Sulfide Anhydride Oxidant Buffer) in S2- species form. A visible spectrophotometer was applied for the analysis of passed H2S gas. Using a PTFE membrane, the optimum flow rate was obtained at 14.71 mL/min, with a mass flux of 0.825 kg/m2.hour, permeability coefficient of 0.696 kg/m2.hour.bar, and percent removal of H2S gas was 88.14%. The optimum flow rate for the SAOB was obtained at a rate of 0.30 mL/min with a mass flux of 0.843 kg/m2.hour and a percent removal of H2S gas of 89.98%. Based on the results obtained on the PVDF membrane, the mass flux produced in the optimization of H2S gas is 0.742 kg/cm2.hour, and the optimization of the SAOB solution is 0.754 kg/cm2.hour. The resulting permeability coefficient value is 0.741 kg/cm2.hour. The results indicate that this study can remove H2S gas at the optimum H2S gas flow rate of 4.76 mL/minute of 94.89% and the optimum SAOB flow rate of 0.3 mL/minute of 95.66%

Analysis of Flavonoid Contents in Coffee Mistella (Dendrophthoe pentandra (L.) Miq.) Using Thin Layer Chromatography-Densitometry Techniques Saputri, Nora Dwi; Adiwinata, I Nyoman; Muflihah, Yeni Maulidah
Indonesian Chimica Letters Vol. 3 No. 1 (2024)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/icl.v3i1.941

Flavonoids, a class of phenolic compounds widely distributed in plants, are present in the coffee mistletoe Dendrophthoe pentandra (L.) Miq. The extraction of flavonoids from Dendrophthoe pentandra (L.) Miq leaves involve the use of methanol as a solvent in maceration extraction methods. The presence of flavonoids was ascertained through color changes from green to yellow-green, yellow, and yellow-orange when subjected to AlCl3 5%, NaOH 10%, and Mg-HCl, respectively. Thin-layer chromatography using aluminum plates coated with silica gel F254 as the stationary phase and methanol-chloroform 4:1 (v/v) as the mobile phase was employed to separate the flavonoids. The method validation demonstrated strong linearity in the concentration range of 60-130 ppm for flavonoid standard solutions, with a correlation coefficient (r) of 0.998. The Limit of Detection (LOD) and Limit of Quantitation (LOQ) were determined to be 182.5 ng and 608.3 ng, respectively. Precision, expressed as Relative Standard Deviation (RSD), was found to be 5.1%, 2.8%, and 2.5% for concentrations of 80, 90, and 100 ppm, respectively. These RSD values were also less than 2/3 CV Horwitz, which were 5.5, 5.4, and 5.4. The method's accuracy was assessed through percent recovery values for each concentration (80, 90, and 100 ppm), which were found to be 102.46 ± 1.78%, 86.14 ± 1.74%, and 89.89 ± 1.44%. The flavonoid content in the dried coffee mistletoe powder was determined to be 1.404x10-2 ± 0.0007 mg per gram, with a water content of 8.7%.

Simultaneous Determination of Magnesium (Mg2+) and Ammonium (NH4+) by Flow Injection Analysis Kholifa, Mulik; Mulyono, Tri; Muflihah, Yeni Maulidah
Jurnal ILMU DASAR Vol 19 No 1 (2018)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

An automatic method for the simultaneous determination of magnesium and ammoniun by flow injection analysis is described. This analysis used two detectors, potentiometry and spectrophotometry, for the determination of magnesium and ammonium simultaneously. Potentiometric detectors are used to detect ammonium ions, whereas spectrophotometer detectors are used to detect the presence of magnesium ions. The performance of the FIA system includes linear range linearity, limit of detection, sensitivity, reproducibility and recovery test. Spectrophotometry FIA showed good performance with several criteria of linearity with regression value of 0.9918, the detection limit of 0.06 ppm, a sensitivity of 0.0115, repeatability of less than 2% and the percent recovery of 91,6%. While potentiometric FIA showed th performance with several criteria of linearity with regression value of 0.9896, the detection limit of 0.17 ppm, a sensitivity of 40.747 mV per decade of concentration, repeatability of less than 2% and the percent recovery of 89,7%. Keywords: Flow Injection Analysis, spectrophotometry, potensiometry, simultaneous

Analisis Ion Fe3+ dan Konduktivitas pada Air Sumur di Sekitar TPA Pakusari secara Simultan Menggunakan Metode Sequential Injection Analysis Sartikasari, Mindarti; Mulyono, Tri; Muflihah, Yeni Maulidah
BERKALA SAINSTEK Vol 6 No 1 (2018)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v6i1.7762

Analisis Fe3+ dan konduktivitas pada air sumur di sekitar TPA Pakusari perlu dilakukan untuk mengetahui kualitas perairan Penelitian ini mengembangkan metode penentuan konsentrasi Fe3+ dan konduktivitas secara simultan dan otomatis dengan menggunakan Sequential Injection Analysis (SIA). Desain SIA dibuat dengan cara menghubungkan syringe pump, selection valve dan kuvet FIA dengan menggunakan pipa kapiler PTFE, sedangkan konduktometer dihubungkan langsung dengan komputer. Salah satu parameter yang memepengaruhi metode ini yaitu volume reagen (KSCN 2M) dan laju alir analit. Hasil penelitian menunjukkan bahwa laju alir optimum pada 100 μL/s dan volume KSCN 2M optimum pada 6 μL. Metode ini diaplikasikan langsung untuk menentukan kualitas perairan di sekitar TPA Pakusari. Pengambilan sampel diambil delapan itik di sekitar TPA Pakusari diperoleh hasil bahwa titik 30 meter sebelah utara penampungan air lindi memiliki konsentrasi Fe3+ melebihi ambang batas yang telah di tetapkan KEPMENKES.RI.No. 907/MENKES/SK/VII/2002 dengan konduktivitas yang lebih tinggi dibandingkan air sumur yang lain.Kata Kunci: Fe3+, simultan, SIA, konduktivitas, air lindi

Pengaruh Variasi Waktu Penguapan Terhadap Kinerja Membran Selulosa Asetat pada Proses Ultrafiltrasi Amiyati, Dewi Rara; Indarti, Dwi; Muflihah, Yeni Maulidah
BERKALA SAINSTEK Vol 5 No 1 (2017)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v5i1.5368

Penelitian ini mempelajari pengaruh variasi waktu penguapan terhadap kinerja membran selulosa asetat. Pada proses ultrafiltrasi, selulosa asetat dibuat dengan menambahkan polietilen glikol (PEG) sebagai agen pembentuk pori membran dan meningkatkan nilai fluks membran. Pembuatan membran selulosa asetat dilakukan dengan metode inversi fasa. Variasi waktu penguapan yang digunakan selama 0, 1, 3, dan 5 menit. Membran selulosa asetat yang terbentuk dikarakterisasi meliputi uji porositas, fluks dan rejeksi. Hasil penelitian menunjukkan waktu penguapan selama 5 menit menghasilkan membran yang lebih rapat. Hasil pengukuran porositas, fluks dan rejeksi terhadap dekstran 500 kDa berturut-turut sebagai berikut: 53,35%; 4,078 (L/jam.m2) dan 92,917%. Kata Kunci: Porositas, Selulosa Asetat,Waktu Penguapan.

Aplikasi Pupuk Organik Cair Berbasis Urine Kelinci sebagai Upaya untuk Meningkatkan Kualitas Tanah Pertanian di Desa Tangsil Wetan, Wonosari, Bondowoso: Application of Liquid Organic Fertilizer Based on Rabbit Urine to Increase the Quality of Agricultural Soil in Tangsil Wetan Village, Wonosari, Bondowoso Tamami, Akfani Jahval; Rayhan, Nevanda Shaquille; Syahrulita, Dita Crisma; Nabila, Cinta Rivani; Jamala, Tipta; Fitriyah, Azhaara Raihanah 'Urfatul; Hanafi, Mustika Intan Sahifah; Vania, Amanda; Farhan, Muhammad; Azhar, Adella Rahani; Ningsih, Fitriyah; Muflihah, Yeni Maulidah
PengabdianMu: Jurnal Ilmiah Pengabdian kepada Masyarakat Vol. 10 No. 7 (2025): PengabdianMu: Jurnal Ilmiah Pengabdian kepada Masyarakat
Publisher : Institute for Research and Community Services Universitas Muhammadiyah Palangkaraya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33084/pengabdianmu.v10i7.9374

The low nutrient content and acidic soil pH (pH 5) are a significant problem in Tangsil Wetan Village, Bondowoso, where most of the population works as farmers. This condition affects the growth and productivity of the farm's produce. To address this issue, we introduced liquid organic fertilizer derived from rabbit urine. The work was implemented in several phases: socialization, training in the production of rabbit urine-based liquid organic fertilizer, fertilizer application, and subsequent observation. The fertilizer production process involves fermenting rabbit urine mixed with molasses, EM4 liquid, and water for ten days. The resulting liquid fertilizer is then applied to the rice fields in three stages of spraying. We conducted observations to measure soil parameters, such as pH, before and after fertilizer application. The results indicated an improvement in soil conditions after the three sprayings, with a notable increase in soil pH from 5.0 to 5.4. However, the short-term impact on plants has been limited; consistent application is necessary to achieve maximum results.

Co-Authors Adiwinata, I Nyoman Amiyati, Dewi Rara Apriliana, Gepsa Asnawati Asnawati Asnawati Asnawati Asnawati Azhar, Adella Rahani Bambang Piluharto Denny Trias Utomo, Denny Trias Diah Ayu Nur Sholehah Dwi Indarti Fitriyah, Azhaara Raihanah 'Urfatul Hanafi, Mustika Intan Sahifah Heny Masruroh, Heny Jamala, Tipta Kholifa, Mulik Kiki Puji Setianingrum Muhammad Farhan Nabila, Cinta Rivani Ningsih, Fitriyah Novita Andarini Qurrota Ayun Rayhan, Nevanda Shaquille Rohmawati, Manis Saputri, Nora Dwi Sartikasari, Mindarti Siswoyo Siswoyo Siswoyo Siswoyo Syahrulita, Dita Crisma Tamami, Akfani Jahval Tanti Haryati Tri Mulyono Tri Mulyono Vania, Amanda Wuryanti Handayani Yudi Aris Sulistiyo, Yudi Aris Zulfikar Zulfikar

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