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All Journal ALCHEMY Jurnal Penelitian Kimia Indonesian Journal of Chemical Analysis (IJCA) Analit: Analytical And Environmental Chemistry
Yulirohyami
Diploma Program Of Analytical Chemistry, Department Of Chemistry, Universitas Islam Indonesia, Indonesia
Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Environmental Science Materials Science & Nanotechnology

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Identification of Fat in Pork Using Fourier Transform Infrared Spectrum and GC-MS Yulirohyami; Vivin Maulidatunnisa; Dinda Permata Pusparani; Bagas Prasetyo
Indonesian Journal of Chemical Analysis (IJCA) Vol. 6 No. 2 (2023): Indonesian Journal of Chemical Analysis
Publisher : Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/ijca.vol6.iss2.art10

Abstract

Halal food safety issues receive serious attention. Methods for analyzing contamination of non-halal ingredients, such as lard, must be developed to assist in the halal authentication process for food. This study was conducted to compare the fat profile of pork thighs using FT-IR and GC-MS. The pork is dried in the oven and then extracted using n-hexane. The resulting fat was characterized by FT-IR. Determination of fatty acids was carried out by GC-MS using a derivatization technique. Based on the results of the study showed that the infrared pattern of lard can be identified from the difference in absorption intensity. Pork fat has a higher unsaturated fatty acid content than beef and chicken. Infrared spectra can confirm the presence of -C=C- bonds at 3005, 1745, 1116, 1550, and 722 cm-1. The FTIR data shows that there are larger unsaturated fatty acid groups in pork fat than in beef and chicken fat. This procedure is a non-destructive method that can be carried out quickly, and cheaply, and can be developed into a routine procedure for halal authentication of food. Based on the results of unsaturated fatty acid testing with GC-MS it can show the content of oleic acid (C18:1) contained in pork. The results of mapping the content of free fatty acids in pork can be used to complete halal authentication data easily and quickly.
Synthesis and Characterization of Microcellulose from Red Algae Gracillaria longissima and Its Effect on the Properties of Composite Films from Avocado Seed Starch Muvika Putri Puspitasari; Ifa Puspasari; Diana Diana; Yulirohyami Yulirohyami
ALCHEMY Jurnal Penelitian Kimia Vol 21, No 2 (2025): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.21.2.97299.414-423

Abstract

Red algae are abundant worldwide, and in recent years, their use to make more valuable products has grown significantly. The present study used red algae Gracillaria longissima as raw material to produce microcrystalline cellulose to strengthen avocado seed-based film. Microcrystalline cellulose was obtained by chemically treating the red algae with alkali, bleaching, and acid hydrolysis. The rough and irregularly shaped microcrystalline cellulose was successfully isolated at the micrometric scale with an average particle size of 44.1 μm. The as-extracted microcrystalline cellulose was used as filler to produce avocado seed-based composite films with improved tensile and barrier properties. Adding 4 wt% microcrystalline cellulose into the avocado seed matrix increased tensile strength by 152% and reduced elongation by 63%. Additionally, the barrier properties of avocado seed composite films were similar to those of cellulose derivatives utilized in food packaging. Adding 4 wt% microcrystalline cellulose into the avocado seed matrix reduced the water vapor transmission rate by 43% of the neat starch value. Considering these findings, microcrystalline cellulose-containing starch film is suggested as a biodegradable substitute for applications in food packaging.
ADSORPSI GAS NO2 MENGGUNAKAN ZEOLIT TERIMOBILISASI GRIESS SALTZMAN Yulirohyami Yulirohyami; Mela Novianty Badriyah; Yunita Yunita
Analit : Analytical and Environmental Chemistry Vol. 7, No. 01 April (2022) Analit : Analytical and Environmental Chemistry
Publisher : Jurusan Kimia FMIPA Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/aec.v7i1.2022.p90-102

Abstract

Telah dilakukan preparasi zeolite terimobilisasi Griess Saltzman sebagai adsorben dalam penentuan gas NO2. Penelitian ini dilakukan untuk mengembangkan prosedur penentuan gas NO2 pada udara ambien atau gas emisi dari sumber bergerak dan tidak bergerak. Preparasi dilakukan melalui proses aktivasi zeolit dengan asam, imobilisasi zeolit dengan pereaksi Griess Saltzman, karakterisasi zeolite terimobilisasi Griess Saltzman, dan analisis gas NO2 dengan adsorben zeolite terimobilisasi Griess Saltzman. Hasil analisis gas NO2 dengan menggunakan adsorben zeolit terimobilisasi Griess Saltzman memberikan linearitas yang baik dengan koefisien linearitas dan koefisien determinasi masing-masing 0,9971 dan 0,9943. LoD dan LoQ yang diperoleh 0,09 dan 0,31 mg/mL. Penggunaan 0,25 g adsorben zeolit terimobilisasi Griess Saltzman memiliki hasil uji yang paling mendekati dengan pengujian standar menggunakan 10 mL pereaksi Griess Saltzman, masing-masing dengan konsentrasi 84,20 ± 1,73 mg/Nm3 dan 84,38 ± 1,73 mg/Nm3. Berdasarkan hasil penelitian dapat disimpulkan bahwa zeolit terimobilisasi Griess Saltzman dapat digunakan sebagai adsoben untuk analisis gas NO2.
Co-Authors Badriyah, Mela Novianty Bagas Prasetyo Diana Diana Dinda Permata Pusparani Ifa Puspasari Mela Novianty Badriyah Muvika Putri Puspitasari Nur ‘Azah Vivin Maulidatunnisa Yunita Yunita Yunita Yunita