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All Journal The Indonesian Green Technology Journal The Journal of Pure and Applied Chemistry Research Jurnal Saintek Lahan Kering
Akhmad Sabarudin
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Earth & Planetary Sciences Materials Science & Nanotechnology Medicine & Pharmacology Public Health Other

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Sintesis Monolith Nanopori dengan Teknik Molecularly Imprinted Polymer Menggunakan Ionic Liquid dan Logam Cu(II) sebagai Metal Mediated Self Assembly Pivot untuk Pemisahan Campuran Senyawa Kiral Bhisma Wildan Khabibi; Nilna Assasiatur Rafika; Shova Audina Hardiyanti; Suci Amalia; Akhmad Sabarudin
The Indonesian Green Technology Journal Vol 10, No 2 (2021)
Publisher : Program Pascasarjana Universitas Brawijaya

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Abstract

Senyawa kiral memiliki peranan penting dalam bidang farmasi dan industri kimia. Pada penelitian yang dilakukan, kolom monolit polimer organik disintesis melalui metode metal-mediated self assembly (MMSA) digunakan sebagai fasa diam kromatografi cair kinerja tinggi untuk pemisahan senyawa kiral. Monolit yang telah disintesis di dalam silicosteel tube (100 x 0.5 mm i.d.) dengan metode reaksi in-situ kopolimerisasi, digunakan 4-vinilpiridin sebagai monomer; etilena glikol dimetakrilat sebagai crosslinker; R-sitronelal sebagai template; logam Cu2+ sebagai metal pivot; 1-butyl-3-methylimidazolium tetrafluoroboronate sebagai porogen ionic liquid (IL); dan azobisisobutyronitrile (AIBN) sebagai radikal inisiator. Kolom silicosteel disilanasi dengan 3-Trimethoxysilylpropyl methacrylate sebelum digunakan untuk polimerisasi agar terbentuk ikatan kovalen antara monolit dan dinding bagian dalam kolom. Komposisi total monomer (%T) dan crosslinker (%C) di optimasi untuk mendapatkan hasil pemisahan kiral yang baik. Morfologi dan struktur pori dari monolit polimer organik dianalisis dengan SEM. Hasil analisis yang telah dilakukan pada kolom monolit MMIP dengan komposisi %T 40 dan %C 35 menunjukan selektivitas yang baik untuk memisahkan sampel R-sitronelal dan S-sitronelal dengan metode isokratik, fasa gerak asetonitril dan air (90:10) (v/v), laju alir 0.04 mL/menit.
Sintesis dan Karakterisasi Nanopartikel Fe3O4 termodifikasi Biokompatibel Polimer serta Potensinya sebagai Penghantar Obat Ika Oktavia Wulandari; Lale B Rahayu; Imam Riva’i; Hermin Sulistyarti; Akhmad Sabarudin
The Indonesian Green Technology Journal Vol 10, No 1 (2021)
Publisher : Program Pascasarjana Universitas Brawijaya

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Abstract

Nanopartikel sebagai agen penghantar obat berbasis Fe3O4 dalam penelitian ini disintesis dengan dua metode, yakni metode kopresipitasi dan metode sonikasi. Permukaan Fe3O4 selanjutnya dimodifikasi dengan penambahan biokompatibel polimer berupa Polivinil Alkohol (PVA) yang terikat silang dengan Glutaraldehid. Penelitian ini juga dilakukan untuk mengidentifikasi pengaruh komposisi PVA terhadap sifat fisik dan magnetik material yang meliputi ukuran kristal, parameter kisi, dan faktor g-lande. Metode kopresipitasi dengan lama waktu reaksi 30 menit mampu menghasilkan nanopartikel dengan ukuran lebih kecil dibandingkan dengan metode sonikasi dalam durasi waktu reaksi yang sama. Namun demikian, apabila waktu sonikasi diperpanjang yaitu selama 60 menit, maka akan diperoleh nanopartikel bare Fe3O4 dengan ukuran yang lebih kecil. Selanjutnya penambahan PVA dan GA sebagai capping agent pada permukaan Fe3O4 dimaksudkan untuk mereduksi pembentukan agregat dan proses oksidasi dari Fe3O4 untuk menghasilkan fasa besi oksida lainnya. Penambahan polimer PVA meningkatkan ukuran kristal nanopartikel dibandingkan nanopartikel Fe3O4 tanpa PVA. Namun peningkatan ukuran yang terjadi tidak lebih dari 20 nm. Modifikasi permukaan juga mempengaruhi ukuran parameter kisi. Selain itu pelapisan permukaan Fe3O4 dengan PVA dapat mereduksi proses oksidasi nanopartikel Fe3O4 yang dihasilkan. Hal ini terbukti dari intensitas puncak difraktogram yang lebih tinggi dibandingkan bare nanopartikel pada posisi hkl yang sesuai untuk Fe3O4. Penambahan PVA juga mempengaruhi nilai faktor g-lande, dimana faktor ini berkorelasi dengan sifat magnetik dari material. Secara umum penambahan PVA dapat menurunkan nilai faktor g-lande, namun material masih tetap memiliki rekativitas terhadap medan magnet eksternal.
Fabrication of Oxide Ceramic MgFe2O4 Using Iron Oxide Isolated from Lapindo Mud as a Raw Material Riska Yudhistia Asworo; Rachmat Triandi Tjahjanto; Akhmad Sabarudin
The Journal of Pure and Applied Chemistry Research Vol 2, No 3 (2013)
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (310.977 KB) | DOI: 10.21776/ub.jpacr.2013.002.03.156

Abstract

The quite high content (28.8%) of iron oxide (Fe2O3) in Lapindo Sidoarjo`s mud promotes as a potential raw material for fabrication of oxide ceramics. The preeminence magnetic properties of iron oxide materials have led to be widely used for preparation of noteworthy products i.e semiconductor ceramics. However, the high band gap of iron oxide results in high resistivity, limiting its application as semiconductor ceramics. The addition of other oxides to iron oxide is able to reduce the energy gap of resulted oxide ceramics. Accordingly, in this study, MgO is added to Fe2O3 isolated from Lapindo mud for preparation of the oxide ceramic MgFe2O4. The products are characterized, which include crystal structure, crystal size and resistivity. It was found that the addition of MgO decreased the volume fraction of spinel structure formation, the average of crystal size, and the resistance value. The ratio MgO/Fe2O3 of 3:7 and a sintering temperature of 1300oC show the optimum composition for fabrication of MgFe2O4 with the volume fraction of 0.72 and the crystal size of 49.06 nm as characterized by XRD.
ANALISIS DIAZINON PADA TANAH LAHAN PERTANIAN MENGGUNAKAN KROMATOGRAFI CAIR KINERJA TINGGI Marselina Theresia Djue Tea; Akhmad Sabarudin; Hermin Sulistyarti
Saintek Lahan Kering Vol 3 No 1 (2020): JSLK JUNI 2020
Publisher : Fakultas Pertanian, Universitas Timor

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (189 KB) | DOI: 10.32938/slk.v3i1.1021

Abstract

A method for the determination of diazinon in soil samples has been developed. The analyte was extracted with acetonitrile from farmland soil sample. Determination and quantification of diazinon were perfomed by high perfomance liquid chromatography (HPLC) with an UV detector. Optimum conditions for diazinon analysis were eluent composition of acetonitrile:water ratio of 60:40, 0.4 mL/min of flow rate, and 220 nm of wavelength. Under the optimum conditions, diazinon linearity was between 1 and 25 mgL-1 with R2 of 0.9976, 1.19 mgL-1 LOD, and 3.98 mgL-1 LOQ. When the method was applied to the soil sample, both pesticides showed acceptable recoveries for real sample of more than 85%: thus, the developed method meets the validation requirement. Under this developed method, the concentrations of diazinon in the soil samples were below the LOD and LOQ (0.577 mgL-1). Therefore, it can be concluded that the soil samples used in this study did not contain diazinon.
Development of High-SPF Sunscreen Cream Formulation Using Green Tea (Camellia sinensis L.) Extract Obtained via Combined Pulsed Electric Field and Microwave–Ultrasound Assisted Extraction (PEF-MUAE) Yulianti, Eny; Warsito; Akhmad Sabarudin; Bayyinatul Muchtarohmah; Titian Ajeng Wahyuningtyas; Okky Vara Velya
The Journal of Pure and Applied Chemistry Research Vol. 14 No. 2 (2025): Edition May-August 2025
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/

Abstract

The tea plant (Camellia sinensis L.) is renowned for its medicinal benefits, largely attributed to its secondary metabolites, which demonstrate significant antioxidant potential. This study focused on evaluating the antioxidant activity of green tea extract and determining the Sun Protection Factor (SPF) of sunscreen formulations containing the extract. The green tea was extracted using a combined Pulsed Electric Field- Microwave-Ultrasonic Assisted Extraction (PEF-MUAE) with distilled water as the solvent. The obtained extract underwent phytochemical analysis and SPF assessment. Various sunscreen formulations were tested for washability, total phenolic content, antioxidant activity, and SPF. The antioxidant activity and total phenolic content of the cream were measured using UV-Vis spectrophotometry, while SPF values were determined with UV-DRS spectrophotometry. The first formulation (F0) consisted of only the cream base, made without green tea extract or TiO₂. The second formulation (F1) was made with TiO₂ but without the extract. The third formulation (F2) contained the extract without TiO₂. Finally, the last formulation (F3) included both green tea extract and TiO₂. The extraction method produced a yield of 38.8%, with all cream formulations exhibiting ease of washability. The antioxidant activity of F0, F1, F2, and F3 was measured at 30.977, 32.866, 34.661, and 28.172 ppm. The total phenolic content and SPF values for the various cream formulations (F0, F1, F2, and F3) were 156.506 ± 10.824, 266.391 ± 33.760, 604.978 ± 22.815, and 680.873 ± 25.881 mg GAE/g for total phenolics, and 14.647, 22.656, 55.136, and 62.935 for SPF values.
Co-Authors Bayyinatul Muchtarohmah Bhisma Wildan Khabibi Eny Yulianti, Eny Hermin Sulistyarti Ika Oktavia Wulandari Imam Riva’i Lale B Rahayu Nilna Assasiatur Rafika Okky Vara Velya Rachmat Triandi Tjahjanto Riska Yudhistia Asworo Shova Audina Hardiyanti Suci Amalia Tea, Marselina Theresia Djue Titian Ajeng Wahyuningtyas Warsito