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All Journal Jurnal Sains Materi Indonesia Jurnal Kimia Mulawarman Chimica et Natura Acta Jurnal Kimia Terapan Indonesia al Kimiya : Jurnal Ilmu Kimia dan Terapan Kimia Padjadjaran
Ahmad Sjahriza
Program Studi Kimia, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Institut Pertanian Bogor, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Environmental Science Materials Science & Nanotechnology

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EMULSI DAN ULTRASONIKASI DALAM PEMBENTUKAN NANOENKAPSULASI IBUPROFENTERSALUTPOLIPADUAN POLI(ASAM LAKTAT) DENGAN POLI(ε-KAPROLAKTON) Tetty Kemala; Ahmad Sjahriza; Siti Komariah
Jurnal Sains Materi Indonesia Vol 12, No 3: JUNI 2011
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (9694.632 KB) | DOI: 10.17146/jsmi.2011.12.3.4612

Abstract

EMULSI DAN ULTRASONIKASI DALAM PEMBENTUKAN NANOENKAPSULASI IBUPROFENTERSALUTPOLIPADUAN POLI(ASAM LAKTAT) DENGAN POLI(ε-KAPROLAKTON). Telah dibuat polipaduan poli(asam laktat) (PLA) dengan poli(ε-kaprolakton) (PCL) sebagai penyalut obat ibuprofen. Pembuatan nanoenkapsulasi ibuprofen dalam penelitian ini dengan cara mengkombinasikan teknik emulsifikasi dan ultrasonikasi. PLA yang digunakan adalah hasil sintesis dengan bobot molekul rata-rata (Mv) 9463 g/mol. Nanokapsul yang dihasilkan berkisar 480 hingga 950 nm. Waktu sonikasi yang paling baik dalam pembentukan nanokapsul adalah 60 menit. Efisiensi dan ukuran nanokapsul meningkat dengan meningkatnya waktu sonikasi. Efisiensi nanokapsul pada waktu sonikasi 30 menit, 45 menit dan 60 menit berurutan adalah 4,514, 9,724, dan 5,987 %.
Mechanical and Barrier Properties of PVP-Carbon Dot Nanocomposite Films Ahmad Sjahriza; Zainal Alim Mas’ud; Komar Sutirah
Jurnal Kimia Terapan Indonesia Vol 20, No 2 (2018)
Publisher : Research Center for Chemistry - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (941.051 KB) | DOI: 10.14203/jkti.v20i2.392

Abstract

This research reported carbon dot were synthesized form citric acid and urea through a single step microwave process and Poly Vinyl Pirrolidone (PVP) films composited by carbon dot were prepared. The effects of different composition carbon dots  on mechanical strength of films and water vapour barrier were evaluated. Highest mechanical yielded composite film were analyzed their thermal stability. Average of carbon dot diameter was found 90.61 nm and polydispersity indice 0.396. Different composition carbon dot exhibit significant improvement in tensile strength and modulus. Water permeablity of films varieate with content of carbon dot. The presence of carbon dot had a negligible effect on Tg of film and show melting process.
Sintesis Oksida Grafena dari Arang Tempurung Kelapa Untuk Aplikasi Antibakteri dan Antioksidan Ahmad Sjahriza; Surya Herlambang
al Kimiya: Jurnal Ilmu Kimia dan Terapan Vol 8, No 2 (2021): al Kimiya: Jurnal Ilmu Kimia dan Terapan
Publisher : Department of Chemistry, Faculty of Science and Technology, UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/ak.v8i2.13473

Abstract

Oksida grafena adalah turunan dari grafena yang mudah disintesis dan aplikasi yang sangat luas. Penelitian ini bertujuan menyintesisoksida grafena dari arang tempurung kelapa yang memiliki karakter partikel nano karbon sebagai antibakteri dan antioksidan. Oksida grafena dari arang tersebut berhasil disintesis dengan rendemen 1,85% b/b menggunakan modifikasi metode Hummers dengan ukuran rataan partikel 33,7 nm. Gugus fungsi beroksigen pada spektrum inframerah pada bilangan gelombang 2933 cm-1 dan 1615 cm-1 menandakan oksida grafena berhasil terbentuk. Puncak difraksi sinar X 23,5o dan kristalinitas sebesar 6,85%. Derajat kristalinitas yang rendah menunjukan bahwa oksida grafena memiliki fasa amorf. Aktivitas antioksidan ditentukan berdasarkan kemampuannya mereduksi besi(III) dan hasil sintesis memperlihatkan aktivitas antioksidan sebesar 50% dibanding standar. Hasil pengujian antibakteri ditandai dengan terbentuknya zona bening terhadap bakteri Escherichia coli dan Staphylococcus aureus sehingga oksida grafena memiliki aktivitas antibakteri namun tergolong lemah.
Modifikasi Karakteristik Kuat Tarik pada Komposit Film Poli(Vinil Pirolidon) dan Karagenan Melalui Pembentukan Komposit Karbon Nano Dot Ahmad Sjahriza; Surya Herlambang; Indah Fajar Wati
al Kimiya: Jurnal Ilmu Kimia dan Terapan Vol 5, No 2 (2018): al Kimiya: Jurnal Ilmu Kimia dan Terapan
Publisher : Department of Chemistry, Faculty of Science and Technology, UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/ak.v5i2.3756

Abstract

Polimer merupakan material yang banyak dijadikan komposit sekarang ini. Teknologi nano dapat berperan sebagai agen komposit yang lebih baik dari pada agen komposit konvensional. C-dot yang merupakan material nano yang dikompositkan dengan polimer alam dan sintetik dengan model berturut-turut karagenan dan poli(vinilpirolidon) (PVP). Pada penelitian ini C-dot disintesis dari asam sitrat dan urea dengan iradiasi gelombang mikro, kemudian produk dimurnikan dan dikarakterisasi. Karagenan diekstraksi dari rumput laut Eucheuma cottonii. Selanjutnya polimer dan C-dot dikompositkan dengan metode Gel-Casting. Sintesis C-dot dari asam sitrat dan urea menghasilkan larutan berwarna hitam yang menandakan C-dot terbentuk, terdapat absorbsi di panjang gelombang 340 nm pada daerah UV yang membuktikan C-dot berhasil disintesis karena serapan tersebut tidak ditemukan pada bahan baku. C-dot yang disintesis memiliki ukuran partikel 90,61 nm dan indeks polidispersitas (PI) sebesar 0,0396. Komposit C-dot dengan polimer dapat meningkatkan kuat tarik dan modulus elastisitas film polimer. Konsentrasi optimum C-dot sebagai pengisi (filler) untuk PVP sebesar 0,7% b/b dan Karagenan 1.5% b/b. C-dot dapat berperan sebagai pengisi (filler) dalam kuat tarik pada film polimer. Penambahan C-dot pada film polimer sintetik maupun alam dapat meningkatkan sifat mekanik dari film polimer dan tidak memberikan hasil yang berbeda.
Active Compounds of Sembung Leaves (Blumea balsamifera DC) in Silico Screening as Antihypertensives Ahmad Sjahriza; Fyrda Shellia; Dyah Iswantini
JURNAL KIMIA MULAWARMAN Vol 21 No 1 (2023)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/jkm.v21i1.1263

Abstract

Hypertension is a structural or functional change in the arteries or the organs it supplies caused by increased blood pressure. Angiotensin-converting enzyme (ACE) can increase blood pressure by converting inactive angiotensin I to active (angiotensin II). Captopril is a hypertension drug that can inhibit ACE activity. Sembung leaf (Blumea balsamifera DC) is a plant that can potentially have antihypertensive activity. This study aims to identify the interaction of active compounds in sembung leaves against ACE as antihypertensive drug candidates through an in silico test based on pharmacodynamic and pharmacokinetic parameters using two docking software, Autodock Vina and PyRx. The results showed that Luteolin was the best test ligand besides having lower ΔG and Ki than control ligands and higher Kd than control ligands. Luteolin was identified to interact with Zn and hydrogen bond interactions at the active site and met the criteria in Lipinski analysis, ADME, and toxicity, so this compound is relatively safe to be used as a drug candidate for the treatment of hypertension.
The Effect of Different Synthesis Solvents and Dialysis Processes on the Optical Properties of Carbon Dots from Spent Coffee Grounds using the Solvotermal Method Putri, Wahyuni Eka; Sjahriza, Ahmad; Sugiarti, Sri
Chimica et Natura Acta Vol 13, No 2 (2025)
Publisher : Departemen Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/cna.v13.n2.52599

Abstract

The distinctive optical properties of carbon dot (CD) make CD is one of the most widely developed carbon nanomaterials today. CD can be synthesized from materials that high in carbon content, such as spent coffee grounds. The optical properties of synthesized CD are influenced by several factors, including the solvent used to synthesize it and the purification method. The purification process that can be done is dialysis. However, this technique is not always used in several researches to purify CD. This study aims to synthesize CD from spent coffee grounds through solvothermal methods with three different solvents, which are water, 50% ethanol (v/v), and absolute ethanol that purified by dialysis and without dialysis and to characterize the differences in its optical properties. The results showed that CD was successfully synthesized with these three solvents, but the optical properties were different. All three solvents produce CD that emits blue light, but differ in intensity. The addition of ethanol can double the luminescence intensity of CD and CD synthesized with 50% ethanol produce the highest luminescence intensity. In addition, CD purified without dialysis produce twice as high luminescence intensity as CD purified by dialysis.
Maggot as a Bioconversion Agent of Cow Blood Waste and Date Pulp into Feed Raw Materials: A Chemical Profile Study Helmi, Imra Atun; Nufus, Hidayati; Ahdavia, Ikrima; Farid, Muhamad; Sjahriza, Ahmad
Chimica et Natura Acta Vol 13, No 2 (2025)
Publisher : Departemen Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/cna.v13.n2.55522

Abstract

Cow blood waste and date residue become environmental problems if not appropriately managed. So far, there has yet to be any special management to handle the waste. On the other hand, cow blood waste and date pulp can be efficiently decomposed by maggots. This research was carried out to utilize organic waste as maggot cultivation by producing animal feed materials high in protein and fat, and to determine the best composition in the feed medium. Maggot feed treatment consisted of household organic waste as P0, mixed feed as P1, the ratio of cow blood waste to date pulp P2 (1:1), P3 (1:2), and P4 (2:1). The maggot flour obtained was analyzed for its proximate, amino acid, and fatty acid content. The results showed the lowest moisture at P3 (2.26%), the highest ash content and fat content at P0 (8.27 and 36.62%), respectively, and the highest protein content at P3 (51.66%). Chemical profile analysis showed the highest amino acids, namely glutamic acid (6.05%) and lauric acid C13:0 as the highest fatty acid. The maggot content, which is rich in protein, can be used as a raw material for livestock feed.
Pembuatan dan Stabilitas Larutan Baku Sulfida dalam Analisis Kadar Sulfida Secara Spektrofotometri Anjani, Shelyna Dwi; Sjahriza, Ahmad; Farid, Muhammad
Kimia Padjadjaran Vol 2, No 2 (2024)
Publisher : Kimia Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Larutan sulfida dapat dibuat dengan mereaksikan hidrogen sulfida dan natrium hidroksida menggunakan generator sederhana. Natrium sulfida bentuk teknisnya tidak murni, sehingga perlu dibuat agar diperoleh natrium sulfida dengan kemurnian yang baik. Penelitian ini bertujuan memperoleh cara pembuatan larutan sulfida yang sederhana, degradasi pereaksi sulfida dan menentukan faktor-faktor yang mempengaruhi kestabilannya dalam analisis secara spektofotometri. Uji stabilitas larutan sulfida menggunakan metode iodometri dan spektrofotometri. Parameter yang digunakan, yaitu wadah penyimpanan, suhu penyimpanan, dan tempat penyimpanan. Larutan sulfida yang memiliki stabilitas tertinggi adalah larutan yang disimpan pada tempat gelap, suhu rendah, dan botol kaca gelap. Pengunaan berbagai jenis botol penyimpanan yang berbeda, yaitu botol plastik putih (HDPE), botol kaca transparan, dan botol kaca gelap memberikan pengaruh tidak berbeda nyata terhadap kualitas larutan sulfida. Berdasarkan ketiga hasil uji menunjukkan larutan sulfida mudah mengalami oksidasi yang disebabkan oleh beberapa faktor seperti cahaya matahari, tempat penyimpanan, dan suhu penyimpanan.
Chemical Profile of Earthworm Flour with Kasgot Media Enriched with Cow Blood and Date Pulp Ahdavia, Ikrima; Helmi, Imra Atun; Nufus, Hidayati; Farid, Muhammad; Sjahriza, Ahmad
Chimica et Natura Acta Vol 13, No 3 (2025)
Publisher : Departemen Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/cna.v13.n3.61732

Abstract

Fish meal is used as an ideal protein source for feed with a high level of digestibility but its limited and costly. This study explores earthworm flour as an alternative protein source, cultivated in kasgot (maggot residue) media enriched with organic waste. The novelty of this research lies in using maggot residue as the living medium for earthworms, enhancing the nutritional value of the earthworm flour, making it more beneficial and suitable as an additive protein feed ingredient. The kasgot medium was formulated by mixing boiled cow blood with date pulp fermented with EM4 probiotics in three different ratios: 2:1 (P1), 1:1 (P2), and 1:2 (P3). The gravimetric, Kjeldahl, and Soxhlet were used to measure water, ash, protein, and fat content. High-Performance Liquid Chromatography (HPLC) with post-column derivatization was applied to identify and measure the amino acid level in earthworm flour. Gas Chromatography (GC) was used to analyze fatty acids using the esterification method. The results of the analysis showed that good earthworm flours were P1 and P3. Water, ash, protein, and fat content in P1 were 2.49%, 7.11%, 56.09%, and 18.70%, respectively. Meanwhile, P3 had a water content of 2.87%, ash content of 7.06%, protein of 54.25%, and fat of 23.77%. The highest content of amino acids in P1 was glutamine (7.66 ppm) and lysine (5.37 ppm). The highest content of fatty acids in P3 was oleic acid (13.41%) and palmitic acid (13.37%). These findings suggest that high protein earthworm flour, particularly from P1 formulations, is a promising alternative protein source for animal feed, offering a sustainable and cost-effective solution to the challenges associated with traditional protein sources.
Co-Authors Ahdavia, Ikrima Anjani, Shelyna Dwi Dyah Iswantini Farid, Muhamad Fyrda Shellia Helmi, Imra Atun Indah Fajar Wati Komar Sutirah Muhammad Farid Nufus, Hidayati Putri, Wahyuni Eka Siti Komariah Sri Sugiarti Surya Herlambang Tetty Kemala Zainal Alim Mas’ud