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All Journal Jurnal Riset Kimia Al-Kimia
Nurfadlilah, Lilik
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Chemistry

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Polimer Kitosan-Natrium Tripolifosfat Tercetak Molekul: Sintesis dan Aplikasinya untuk Ekstraksi Residu Antibiotik pada Hasil Peternakan Amanda, Eviomitta Rizki; Sabilillah Lukito Pradana, Alif; Yusril Fitroni, Muhammad; Reza Adzania, Imelda; Nisfi Laili, Wida; Nurfadlilah, Lilik; Satrio Putra, Galih
Al-Kimia Vol 12 No 2 (2024): DECEMBER
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/al-kimia.v12i2.48765

Abstract

Analysis of antibiotic residues in livestock products is challenging due to the low concentration of antibiotic residues and the complexity of the sample matrix. This study successfully used selective adsorbents from molecular imprinted polymer (MIP) materials for sample preparation. An adsorbent made of chitosan-based molecular imprinted polymer (Chi-MIP) was used to extract tetracycline residues from egg and milk samples. The adsorbent was made by preparing 0.1 grams of Chi-MIP in a 2x2 cm cellulose filter paper bag. Next, an adsorbent containing tetracycline was added to the sample. The extraction process was carried out using a hotplate stirrer. At the end of the extraction process, the extracted antibiotics are removed from the adsorbent through a desorption process in an organic solvent via an ultrasonicator. After that, the desorbed analytes were analyzed via a UV‒Vis spectrophotometer at a wavelength of 267 nm. To obtain optimum results, the extraction conditions were optimized to obtain the following results: extraction time of 12 minutes, desorption time of 3 minutes, and ethyl acetate as the desorbing organic solvent. Using the standard addition method, method validation results were obtained for each milk and egg sample matrix, which indicated a linearity range of 1–5mg/L, a correlation coefficient (R2) of 0.99, accuracy values ​​of 98.22% and 88.10%, precisions of 2.74% and 1.06%, LoDs of 0.4 mg/L and 0.51mg/L, LoQs of 1.52mg/L and 1.70mg/L, and enrichment factors of 3.27.
Selectivity of Molecularly Imprinted Polymer-based Chitosan Membrane for Caffeine Separation by Filtration Amanda, Eviomitta Rizki; Oktavianti, Lia Wanda; Aisyah, Mareta Nur; Azizah, Cindy Izatin; Nurfadlilah, Lilik
Jurnal Riset Kimia Vol. 16 No. 1 (2025): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v16i1.767

Abstract

Caffeine is a chemical compound that can be isolated from coffee beans. The isolation and purification of caffeine compounds have been successfully carried out using a filtration method using chitosan biomaterial synthesized by molecularly imprinted polymer (MIP). Chitosan as a functional polymer is dissolved in acetic acid (2% v/v) with stirring at 60°C overnight until a clear and homogeneous solution is formed. Furthermore, caffeine as a template molecule is added to the polymer solution and stirred for 60 minutes. The polymer solution is poured into a petri dish until evenly distributed and dried in an oven at 60°C for 12 hours. The dried polymer solution is then soaked in sodium tripolyphosphate as a crosslinking solution and dried again in the oven until the membrane sheet separates from the petri dish. The membrane sheet is then washed using distilled water until the pH is neutral and continued washing with chloroform to remove caffeine from the membrane pores to form an MIP membrane. The formed MIP membrane is characterized using FTIR and SEM. The MIP membrane was then cut into a circle, inserted into an empty syringe, and used to filter samples containing caffeine. The filtration results were analyzed using a UV-Vis spectrophotometer which showed that caffeine filtered with the MIP membrane contained less interference than caffeine filtered with a non-imprinted polymer membrane (NIP). Quantitative analysis was also carried out using the spiked sample method to determine the recovery value of the filtration results. From this study, the percentage recovery value (% recovery) was obtained at 96.16 - 103.80%.
Co-Authors Aisyah, Mareta Nur Amanda, Eviomitta Rizki Azizah, Cindy Izatin Galih Satrio Putra Nisfi Laili, Wida Oktavianti, Lia Wanda Reza Adzania, Imelda Sabilillah Lukito Pradana, Alif Yusril Fitroni, Muhammad