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Analisis Hubungan Kuantitaf Struktur Dan Aktivitas Sebagai Antioksidan Turunan Senyawa Apigenin Dengan Menggunakan Metode Recife Model 1 (RM 1) Puspasari, Jesi; Banon, Charles; Wiradimafan, Khafit; Avidlyandi, Avidlyandi; Adfa, Morina
RAFFLESIA JOURNAL OF NATURAL AND APPLIED SCIENCES Vol. 5 No. 2 (2025): Oktober
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rjna.v5i2.47368

Abstract

Penelitian ini menggunakan kajian teoritis HKSA senyawa turunan apigenin menggunakan deskriptor sterik, hidropobik dan elektronik. Nilai deskriptor diperoleh berdasarkan perhitungan kimia komputasi menggunakan program Hyperchem 8.0.8 dengan menggunakan metode semiempirik Recife Model 1 (RM1). Data hasil perhitungan diolah menggunakan program SPSS versi 22.0 dengan metode analisis korelasi dan regresi linear berganda, sehingga diperoleh persamaan HKSA: IC50 = 55,725 + (6,063)Log P + (-0,045) ∆f + (-1,603) μ + (0,902)A n = 16; R = 0,927; R2= 0,859; SE = 2,088; F = 16,746. Dari persamaan HKSA, didapatkan prediksi senyawa yang sangat berpotensi sebagai antioksidan, yaitu 4’,5,7- Trihidroksi-3- metoksi flavon dengan nilai IC50 sebesar 1,51 (μM). Dengan membandingkan nilai IC50, didapatkan hasil bahwa gugus metoksi (OCH3) lebih meningkatkan aktivitas antioksidan dibandingkan dengan gugus etoksi (OC2H5).
Modified Polystyrene Waste as Cation Exchange Material and Its Characterization Nendo, Felicia Febyola; Sutanto, Teja Dwi; Banon, Charles; Angasa, Eka; Gustian, Irfan
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 11, No 1 (2026): February 2026
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v11.i1.67

Abstract

Modification of polystyrene (PS) waste into sulfonated polystyrene (PSS) as cation exchange material and its characterization has been carried out, the polystyrene waste used is styrofoam from air conditioner packaging. Modification is carried out through the sulfonation process of styrofoam using acetyl sulfate as a sulfonating agent in tetrahydrofuran (THF) solution. Sulfonation is carried out at a temperature of 40 °C for 3.5 hours under nitrogen gas flow. The modified product is then characterized using FTIR, SEM, and testing the degree of sulfonation, water absorption capacity, and cation exchange capacity (CEC). The results show that modification has occurred in the presence of a sulfonate group (–SO₃H) which is characterized by the appearance of characteristic peaks of 1033 cm⁻¹, 1162 cm⁻¹ and 3329 cm⁻¹ in the FTIR spectrum and SEM results show that the PS structure which is not rough and becomes a rougher and non-uniform structure after sulfonation. The degree of sulfonation obtained reached 58%, the maximum water absorption achieved was 39% after soaking for 72 hours, and the highest measured cation exchange capacity was 1.87 meq/g in 1.5 N NaCl solution. These results indicate that styrofoam waste has the potential to be used as a basic material for efficient and environmentally friendly cation exchange resins.Keywords: Polystyrene, Sulfonation, Acetyl sulfate, Cation exchange capacity, Activation energy
Co-Authors A.A. Ketut Agung Cahyawan W Agus Martono Agus Martono Hadi Putranto Aldi Reviansyah Amalia, Desy Amanta, Reyrin Ceria Arif Juliari Kusnanda Asdim Asdim Asdim Asteria, Marissadona Asti Arum Sari Aswanda Aswin Falahudin Aswin Falahudin Avidlyandi, Avidlyandi Azzahra, Istiqoma Bambang Trihadi Bambang Trihadi Cahyani, Aswinda Delia Komala Sari, Delia Komala Deni Agus Triawan Devi Nurhasana Devi Ratnawati Devirizanty, Devirizanty Dina Erliana Dinda Fransiska.D. N Dwi Kamilla Putri Dwita Oktiarni Eka Angasa Esi Agnesa Evi Maryanti Fatkhurrachman Fatkhurrachman Febriansyah, Rahmaga Fika Dwi Andika Gustian , Irfan Gusvita, Nola Helfi Eka Saputra Herlita Widiyanti Hevio, M. Maqbul Farhansyah Ika Diana Evita Ilman Koharudin Indri Anggraini Indriyani, Miranda Dwi Irfan Gustian Irfan Gustian Irfan Gustian Irfan Gustian Kaus, Noor Haida Mohd Khafit Wiradimafan Khafit Wirdimafan Khusnul Azizah Kurnia Farah Andina Lisa Anggraini Lisna Hamni Morina Adfa Morina Adfa Mudyanto, Andre Munifilia Ekasari Muslimah, Annisa Nadia Refa Fheronica Nanda, Yogie Andika Tri Nendo, Felicia Febyola Nesbah Nesbah Nesbah Nizar, Umar Kalmar Novianti, Feni Mia Noza Alika Puteri Nurhasana, Devi Nurmalawati, Susiana Nurwidiyani, Ria Oktarini, Rizki Puspasari, Jesi Putri, Mutiara Wulandare ka Jolie Putri, Yona Harianti Qotimah, Wahyu Ningsi Rahmaga Febriansyah Rahmawati, Reza Reza Rahmawati Ria Nurwidiyani Risky Hadi Wibowo Risky Hadi Wibowo Risma Sari, Risma SALPRIMA YUDHA S Salprima Yudha S. Sari, Amalia Upida SEPTI WULANDARI Siburian, Devi Melisa Simanjuntak, Gresanty Oktavia Suryadi Jaya Teja Dwi Sutanto Totok E. Suharto Triawan, Deni Agus Vanessgia, Resika Widia Rahmi Winda Shari Wulandari, Saskia Shaumi Yana, Risti Yoravika Dwiwibangga Zahra, Asty Alifah