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All Journal VALENSI EKSAKTA: Journal of Sciences and Data Analysis Reaktor JURNAL KIMIA SAINS DAN APLIKASI Prosiding Seminar Nasional MIPA Wahana Matematika dan Sains Alchemy : Journal of Chemistry JURNAL PIJAR Journal of Mathematical and Fundamental Sciences Elkawnie PROSIDING SEMINAR KIMIA Jurnal Litbang Industri INDONESIAN JOURNAL OF PHARMACY Al-Kimia Indonesian Journal of Chemistry Sains Natural: Journal of Biology and Chemistry Chemistry Indonesian Journal of Chemical Research ALKIMIA : Jurnal Ilmu Kimia dan Terapan Jurnal Ilmiah Teknik Kimia Jurnal Inovasi Teknik Kimia Molluca Journal of Chemistry Education (MJoCE) Jurnal Riset Teknologi Pencegahan Pencemaran Industri Jurnal Pijar MIPA Jurnal Farmasi Etam Jurnal Ilmiah Berkala Sains dan Terapan Kimia Jurnal Litbang Industri Jurnal Natural Molekul: Jurnal Ilmiah Kimia Bulletin of Chemical Reaction Engineering & Catalysis JURNAL REKAYASA KIMIA & LINGKUNGAN
Dwi Siswanta
Chemistry Department , Faculty Of Mathematics And Natural Science, Gajah Mada University, Sekip Utara, Yogyakarta, Indonesia
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Earth & Planetary Sciences Education Energy Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Neuroscience Physics Social Sciences

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Syringe Solid-Phase Extraction for Cu(II) in Powder Milk Using Alginate-Chitosan-PVA Adsorbents: Method Development and Application Yaqin, Ahmad Akhib Ainul; Siswanta, Dwi; Suherman, Suherman
Indonesian Journal of Chemistry Vol 26, No 2 (2026)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.112867

Abstract

This research designed and optimized a syringe solid-phase extraction (SPE) technique employing a modified chitosan, alginate, and PVA (CAP) adsorbent for the determination and preconcentration of Cu(II) ions in powdered milk samples. The material was characterized using FTIR, SEM-EDX, and XPS analyses, which confirmed the detection of predominant –COOH, –NH2, and –OH functional groups. Optimization of the method was performed using both the one-variable-at-a-time (OVAT) approach and the central composite design (CCD) method. Parameters such as pH, CAP dosage, number of samples, and eluent (including HNO3) were evaluated. Optimal OVAT conditions were pH 4.0, 100 mg CAP, 5 samples, and eluent cycles with 2.0 M HNO3, achieving a 100-fold preconcentration. CCD optimization yielded similar results, with slight variations: optimal pH 4.3, CAP mass 105 mg, and 5 eluent cycles with 2.0 M HNO3. CAP exhibited high selectivity (90–99%) and was reusable for up to three adsorption–desorption cycles. Validation using reference material (ERM–BD151) resulted in a recovery of 95.4% for Cu(II). Application of the validated method to real milk samples yielded recoveries of 90.8–97.8%, demonstrating high accuracy. These findings suggest that syringe SPE using CAP is an efficient technique for Cu(II) preconcentration in food matrices.
Penentuan Metode Komputasi Untuk Analisis Hubungan Kuantitatif Struktur dan Aktivitas Senyawa Turunan Triazolopiperazin Amida Anjar Purba Asmara; Mudasir Mudasir; Dwi Siswanta
Elkawnie Vol. 1 No. 1 (2015)
Publisher : Faculty of Science and Technology Universitas Islam Negeri Ar-Raniry

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/ekw.v1i1.515

Abstract

Penentun metode komputasi untuk analisis hubungan kuantitatif struktur dan aktivitas (HKSA) telah dilakukan pada senyawa turunan triazolopiperazin amida sebagai inhibitor enzim DPP IV yang merupakan penyebab diabetes melitus tipe 2 (DM2). Metode komputasi yang digunakan untuk analisis ini adalah metode semiempirik. Analisis dilakukan dengan pemodelan struktur senyawa turunan triazolopiperazin amida dan perhitungan deskriptor HKSA dilakukan menggunakan program Hyperchem. Parameter yang digunakan adalah pergeseran kimia 13C NMR, panjang ikatan antaratom, sudut ikatan antaratom, dan muatan atom bersih. Hasil perhitungan parameter tersebut dibandingkan dengan data empiris dan hasil perhitungan metode ab initio. Hasil penelitiannya menunjukkan bahwa metode semiempirik yang sesuai untuk analisis HKSA senyawa turunan triazolopiperazin amida adalah AM1 dan PM3.
Analisis Hubungan Kuantitatif Struktur Dan Aktivitas Senyawa Turunan Triazolopiperazin Amida Menggunakan Metode Semiempirik AM1 Anjar Purba Asmara; Mudasir Mudasir; Dwi Siswanta
Elkawnie Vol. 1 No. 2 (2015)
Publisher : Faculty of Science and Technology Universitas Islam Negeri Ar-Raniry

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/ekw.v1i2.525

Abstract

QSAR studies had done on derivatives of triazolopiperazine amide as inhibitors DPP IV enzyme that causes diabetes mellitus type 2. The studies had began by modeling the structures of the derivatives of triazolopiperazine amide and calcutating the descriptors of QSAR by semiempirical AM1 method which available on HyperchemÒprogram. QSAR analysis had done by multilinear regression method analysis which is available on SPSSÒprogram using electronic and molecular parameters. The best QSAR equation model for method of semiempirical AM1:-log IC50 =  152.252 + (18,.295*qC1) + (2.343*qC5) + (2263.448*qC9) +  (1662.252*qC10) – (350.806*qC15) + (639.687*qO25)+ (6.515*EH)n = 18; r2 = 0.712; adjusted r2 = 0.510; Fhit/Ftab = 1.124; PRESS = 0.006 The main side of the compound can be determined through the equation. It can be used to study in preventing the disease of DM2 by inhibiting of enzyme DPP IV.
Co-Authors ., Jumina Abdul Karim Zulkarnain Abner Tonu Lema Adhitasari Suratman Adhitasari Suratman Adhitasari Suratman Adhitasari Suratman Agnes Dyah Novitasari Lestari Agung Abadi Kiswandono Ahmad Nasir Pulungan Akhmad Damsyik Aloisius M. Kopon Aloisius Masan Kopon Anjar Purba Asmara Anselmus Boy Baunsele Bambang Kuswandi Bambang Kuswandi Bambang Rusdiarso Bambang Rusdiarso Bastiana, Adinda Putri Desi Suci Handayani Dhony Hermanto Eko Sugiharto Eko Sugiharto Eni Kartika Sari Erly Grizca Boelan Faderina Komisia Febi Indah Fajarwati Febriasari, Arifina Febriasari, Arifina Fidelis Nitti Fitrilia Silvianti Girsang, Ermi Herdiansyah Herdiansyah Herdiansyah Herdiansyah Hidetaka Kawakita Hildegardis Missa Johnson N Naat Jumina Jumina Jumina Jumina Jumina Jumina Juniva Laila Sihombing, Juniva Laila Karelius Karelius Keisuke Ohto Kopon, Aloisius Masan Leba, Maria A. U. Maria A. U. Leba Maria Aloisia Uron Leba Maria Benedikta Tukan Merpiseldin Nitsae Mudasir Mudasir Mudasir Mudasir Mudasir Mudasir Mudasir Mudasir Muhammad Cholid Djunaidi Mustofa Mustofa Neolaka, Yantus A B Ni Putu Sri Ayuni Nindita Clourisa Amaris Susanto Nugraha, Gerry Nurillahi Febria Leswana Nurul Hidayat Aprilita Nurul Ismillayli Pratama J. Wibawa Rahayu Rahayu Rahayu Rahayu Rahmat Basuki Rahmat Basuki Retno Ariadi Lusiana Rika Wulandari Rika Wulandari Romelos Untailawan Sehol, Muhamad Soerja Koesnarpadi Sri Juari Santosa Sri Juari Santosa Sri Juari Santosa Suherman, Suherman Suyanta Suyanta Taek, Maximus M. Takashi Hayashita Triana Kusumaningsih Tukan, Gerardus D. Uripto Trisno Santoso Widya Krestina, Luqman Hakim, Dyah Ayu Pramoda Wardani, Yaqin, Ahmad Akhib Ainul