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All Journal Science and Technology Indonesia JURNAL TEKNOLOGI INFORMASI
Sabrina, Alya
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Environmental Science Materials Science & Nanotechnology Physics

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Analisis Proses Bisnis Sistem Informasi Alumni UIN Sunan Kalijaga Yogyakarta Mahmud, Muhammad Bahaudin; Sabrina, Alya; Ersyada, Azza Ibraisama; Sumarsono, Sumarsono
JURNAL TEKNOLOGI INFORMASI Vol 9, No 1 (2023): Jurnal Teknologi Informasi
Publisher : Universitas Respati Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52643/jti.v9i1.2783

Abstract

Seiring dengan kebutuhan akan informasi yang cepat, tepat dan akurat, hal ini sudah menjadi bahan pertimbangan bagi instansi atau perguruan tinggi yang berkepentingan dalam mengambil dan memperoleh suatu keputusan yang akurat. Sistem Informasi adalah suatu alat penunjang untuk membantu kegiatan suatu organisasi untuk menunjang kegiatan manejerial dalam bidang apapun. Sedangkan alumni adalah orang yang pernah atau lulus dari suatu sekolah atau perguruan tinggi. Salah satu cara untuk mendapatkan informasi tersebut salah satunya yaitu data alumni UIN Sunan Kalijaga Yogyakarta apabila sudah mempunyai lulusan tentunya membutuhkan informasi lulusannya yang bertujuan sebagai rekam jejak digital mahasiswa alumni tersebut dengan menggunakan Sistem Informasi Alumni UIN Sunan Kalijaga Yogyakarta. Dari permasalahan tersebut penulis ingin menganalisa permasalahan yang ada di sistem dan mencoba untuk mengembangkan menjadi sistem informasi alumni yang lebih baik dan informatif di di UIN Sunan Kalijaga Yogyakarta.
Synthesis of Au-Pd-NPs Materials and Application as Electrochemical Sensor of Hydroquinone in Cosmetics Riyanto; Mardliyaliari, Safira; Sabrina, Alya; Ridho, Muhammad
Science and Technology Indonesia Vol. 10 No. 1 (2025): January
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.1.294-302

Abstract

Hydroquinone is a hazardous and toxic chemical often added to cosmetics due to bleaching properties. It is commonly analyzed in cosmetics using expensive and time-consuming instruments, showing the need for a cheap, fast, and sensitive hydroquinone electrochemical sensor. The performance of electrochemical sensor to detect hydroquinone is determined by the working electrode. Therefore, this study aimed to explore the synthesis of Au-Pd-NPs working electrode and application as electrochemical sensor of hydroquinone in cosmetics. Synthesis process was carried out by preparing Au-NPs using banana peel extract (Musa acuminata Colla) as a bioreductor, followed by adding H2PdCl4 solution. Au-NPs nanoparticle was confirmed using Ultraviolet-Visible spectrophotometer, which showed maximum wavelength of 550 nm. The indication of Au-Pd-NPs was shown by the peak at the same wavelength. The FTIR spectrum showed pectin which acted as a bioreductant agent in synthesis of nanoparticles. The results of the TEM image showed that Au-NPs had a spherical shape in the dark field with a diameter of 38.5 ± 3.3 nm and a Pd shell layer around the Au core in the bright field with a diameter of 12.4 ± 2.6 nm. The solid Au-Pd-NPs materials were made into a composite electrode by adding PVC and tetrahydrofuran as solvents. Electrochemical response of Au-Pd-NPs electrode was tested by cyclic voltammetry in ferricyanide and PBS solutions at pH 7.0. Based on CV in the ferricyanide system, it shows that Au-Pd-NPs electrode produces peak oxidation and reduction currents ten times higher than Au-NPs. These data indicate that Au-Pd-NPs are more reactive and sensitive than Au-NPs electrodes. The Au-Pd-NPs electrode was used to analysis the concentration of hydroquinone in cosmetics samples. Electrochemical response showed a linearity (R2) of 0.9935 in concentration range of 0-60 mM, containing 1.12% hydroquinone.
Co-Authors Ersyada, Azza Ibraisama Mahmud, Muhammad Bahaudin Mardliyaliari, Safira Muhammad Ridho Riyanto Sumarsono Sumarsono