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All Journal Jurnal Ilmu Pertanian VALENSI CHEMISTRY PROGRESS Jurnal Sains Dasar Alchemy : Journal of Chemistry Jurnal Ilmu Kimia Universitas Brawijaya Indonesian Green Technology Journal Natural B The Journal of Pure and Applied Chemistry Research Program Kreativitas Mahasiswa - Penelitian Majalah Kesehatan FKUB Indonesian Journal of Chemistry Jurnal Saintek Lahan Kering Molekul: Jurnal Ilmiah Kimia jurnal Ilmu Pertanian (Agricultural Science) JKPK (Jurnal Kimia dan Pendidikan Kimia) Jurnal Muara Sains, Teknologi, Kedokteran dan Ilmu Kesehatan Bubungan Tinggi: Jurnal Pengabdian Masyarakat Jurnal Ilmiah Berkala: Sains dan Terapan Kimia Makara Journal of Science al Kimiya : Jurnal Ilmu Kimia dan Terapan
Hermin Sulistyarti
Brawijaya University
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Education Energy Engineering Environmental Science Materials Science & Nanotechnology Medicine & Pharmacology Public Health Social Sciences Other

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Journal : Makara Journal of Science

 1 
A Simple and Safe Spectrophotometric Method for Iodide Determination Sulistyarti, Hermin; Atikah,; Fardiyah, Qonitah; Febriyanti, Sita; Asdauna,
Makara Journal of Science Vol. 19, No. 2
Publisher : UI Scholars Hub

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Abstract

In order to practice green chemistry, a simple and safe spectrophotometric method for iodide determination has been successfully developed based on the formation of a blue starch-iodine complex. Iodide was oxidized to form iodine prior to the addition of a starch solution, and the blue starch-iodine complex was directly detected spectrophoto-metrically at a wavelength of 615 nm. The chemical parameters, such as type, reaction time, as well as concentration of oxidizing agents and solution pH were optimized with respect to sensitivity and analysis time. The method showed optimum results under iodate oxidant with a mol ratio of IO3-:I- =1:3, reaction time of 5 minutes, and solution pH of 5. Under these optimum conditions, the method showed linierity measurements from 5-40 mg/L iodide with a correlation (R2) of 0.9889. This technique offers a simple, safe, accurate, and relatively fast method for iodide determination, which is prospective for monitoring iodide samples.
Microfluidic Paper-Based Analytical Device (μPAD) for Determining Hydroquinone in Facial Whitening Cream using Phloroglucinol Reagent Sulistyarti, Hermin; Puspitaloka, Paradhita Ayu; Putra, Boyfannie Ivan; Retnowati, Rurini; Tolle, Herman
Makara Journal of Science Vol. 25, No. 2
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A microfluidic paper-based analytical device (µPAD) is developed in this work to analyze hydroquinone in facial whitening creams using phloroglucinol. The µPAD features a hydrophobic barrier for detection and was fabricated using a wax printer with Whatman chromatographic paper. Detection was achieved by colorimetry based on the formation of an orange hydroquinone–phloroglucinol complex. The colored reaction product formed on the detection zone of the µPAD was scanned, and the images obtained were processed with Image-J software to determine their color intensity (RGB value). Optimization of the process conditions was conducted to achieve sensitive measurements. The optimum conditions yielding maximum sensitivity included a reagent addition sequence of phloroglucinol à NaOH à sample (hydroquinone), 1 µL of 0.5% phloroglucinol, 1 M NaOH, and 10-minute reaction. Under optimal conditions, the µPAD produced two linear calibration curves for hydroquinone at concentrations of 10–100 mg/L (R2 = 0.9979) and 250–1000 mg/L (R2 = 0.9991). The method demonstrated very good selectivity for the target analyte in the presence of propylene glycol and resorcinol with satisfactory validity and average recovery close to 100%. The proposed µPAD is a very simple and inexpensive technique for hydroquinone analysis and could be applied to cosmetics samples with satisfactory results.
Determination of Total Ammonia Nitrogen by Gas-Diffusion Flow Injection Analysis (GD-FIA)-Spectrophotometry using Minnieroot Flower (Ruellia tuberosa) as Natural Reagent Putri, Lani Artana; Mufidah Sari, Puspita; Sulistyarti, Hermin; Sabarudin, Akhmad; Sulistyo, Erwin
Makara Journal of Science Vol. 26, No. 4
Publisher : UI Scholars Hub

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Total ammonia nitrogen (TAN) is a pollutant agent found in water and generated from the metabolisms of living organisms and the decomposition of organic matter. This research aims to develop an efficient, low-cost, and environmentally friendly TAN analysis method. The principle of this method is based on the reaction of TAN injected in the donor stream with NaOH to form alkaline gaseous ammonia. The gaseous ammonia diffuses through a hydrophobic membrane into an acceptor stream containing Ruellia tuberosa extract. The presence of NH3 gas in the acceptor stream changes the extract color from pinkish to green, which is monitored by spectrophotometer at 620 nm. This method was also validated based on linearity, selectivity, and accuracy. Under the obtained optimum conditions of 1 M NaOH, 5% extract, a 120 cm mixing coil, and a 200 µL sample volume, the proposed method showed excellent linearity at 10–1000 ppm (R2 = 0.993). The selectivity test result shows that this method was selective against sulfite and nitrite compounds up to 600 ppm with a % error value <10%. This method was applied to measure the total ammonia concentration in agricultural water, and satisfying results were shown by high recoveries of 95.03%–98.84%.
Co-Authors 'Aisy, Kamila Rohadatul Abdjan, Muhammad Ikhlas Abdul Malik Bahrudin Abner Tonu Lema Adam Wiryawan Afidatul Muadifah Akhmad Sabarudin Akhmad Sabarudin Akhmad Sabarudin Akhmad Sabarudin Akhmad Sabarudin Ani Mulyasuryani Antesar Elmagirbi Aprilia Nur Tasfiyati Asdauna Zahrotun Nisa Asdauna, Asnaili Alfi Nurillah Atikah Atikah Atikah Atikah Atikah Atikah Atikah Atikah Atikah Atikah Atikah Atikah Atikah Atikah Atikah, Atikah, atikah Aulani`am Aulani`am Aulanni`am, Aulanni`am Balqis Milda, Balqis Barlah Rumhayati Bheta Sari D, Bheta Sari Chanif Mahdi Chanif Mahdi Dedeh Kurniasih Dedeh Kurniasih Dewi Annisa’ Dewi Setyowati Dewi Umaningrum Diana Candra Dewi Eka Ratri Noor Wulandari Elvian Eka Krisnaniningrum Erliana Ginting Erwin Sulistyo Erwin Sulistyo Fahmi, Ahmad Luthfi Fahrana Salas Trenggamayu Nelgi Febriyanti, Sita Gunawan, David Herman Tolle Hikmanita Lisan Nashukha Hilda Emilia Fahriyani, Hilda Emilia Ika Oktavia Wulandari Imam Riva’i Indriana, Silvi Avianti Khanifah, Nurul Krisna Rendi Awalludin Kusumaningtyas, Nadia Mira Kusumawardhani, Nury Lale B Rahayu Lilik Suryati Luluil Maknun Mariam Mohamed Omar Alshibani Mega Madha Wijaya Mike Nur Izzati Mochammad Imron Awalludin Mufidah Sari, Puspita Muhammad Iqbal Fahmi Noerma Juli Azhari Novy Lailatuz Zulfah Nury Kusumawardhani Palupi, Endah Sekar Puspitaloka, Paradhita Ayu Putra, Bhurman Pratama Putra, Boyfannie Ivan Putra, Chairil Anjasmara Robo Putri Dini Putri, Krista Firdaus Suwarno Putri, Lani Artana Qonitah Fardiyah Qonitah Fardiyah Qurrata Ayun Rizal Nur Huda RR. Ella Evrita Hestiandari Rurini Retnowati Rurini Retnowati Sasangka Prasetyawan Silvi Avianti Indriana Sita Febrianti Spas D. Kolev Stephanie Lim Sutrisno Sutrisno Syarifah, Anisa Lailatusy Tea, Marselina Theresia Djue Tuti Kurniati Tuti Kurniati Yudha Ikoma Istanti Yulia Dwi Cahyani, Yulia Dwi Zulfah, Novy Lailatuz Zuri Rismiarti ‘Aisy, Kamila Rohadatul