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Sutopo Hadi
Department Of Chemistry, Faculty Of Mathematics And Natural Sciences, Universitas Lampung, Bandar Lampung, 35145, Indonesia
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Health Professions Immunology & microbiology Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Physics Social Sciences

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Synthesis of Silver Nitrate by Evaporation Chemical Reduction Process as Potential Materials for Silver Nanowires Application Junaidi; Malik, Daffa Abdul; Rizki, Muhammad; Pratiwi, Indah; Karo-Karo, Pulung; Marjunus, Roniyus; Asmi, Dwi; Hadi, Sutopo
Science and Technology Indonesia Vol. 9 No. 3 (2024): July
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2024.9.3.642-650

Abstract

In this study, we conducted the extraction of silver nitrate (AgNO3) using the chemical reduction evaporation method, involving silver metal (Ag) with a molarity of 7.716 M and nitric acid (HNO3). The heating process via evaporation was carried out at 85oC for 2 hours. Subsequently, the synthesis of silver nanowires (AgNWs) was performed using a 0.3 M of AgNO3 solution in ethylene glycol (EG), polyvinyl pyrrolidone (PVP), and Iron (III) Chloride hexahydrate (FeCl36H2O). XRD analysis of the AgNO3 sample revealed an orthorhombic crystal structure with a single AgNO3 phase peak. In AgNWs, three crystalline phases were observed, with the Ag phase being the most dominant. The average crystal size of AgNO3 and AgNWs was 109.42 nm and 22.06 nm, respectively. The average crystal size of the AgNO3 sample may be influenced by the aggregation between crystal nuclei during the heating process. XRF analysis indicated a 98.84% Ag concentration in AgNO3. SEM-EDS analysis showed that the AgNO3 sample had a non-aggregated morphological structure, with particle size measuring 49.46 μm and an overall AgNO3 purity of 92.68%. The SEM image of the AgNWs sample displayed a very homogeneous diameter of ∼200 nm with a length of around 10-20 μm. Meanwhile, AgNWs exhibited a morphology resembling rod-shaped wires with a purity of 68% for Ag.
Design and Realization of Temperature and Speed Control System of Meyer Rod Coating Based on Arduino for Silver Nanowires Thin Film Applications Junaidi, Junaidi; Irvana, Raihan; Ayu, Humairoh Ratu; Karo , Pulung Karo; Surtono, Arif; Marjunus, Roniyus; Hadi, Sutopo
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol. 13 No. 2 (2023)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v13n2.p95-105

Abstract

The design and implementation of an Arduino-based temperature and speed control system for Meyer rod coating have been successfully accomplished. The tool is capable of automatically regulating the temperature and speed of the plate and Meyer rod. The components utilized in manufacturing the coating tool include Arduino Uno, stepper motor, thermocouple sensor, heating plate, relay, stepper motor driver (TB6560), and thermocouple sensor supported by the MAX-6675 module. The motivation behind developing this tool stems from the inconsistency in temperature and speed during manual Meyer rod coatings, where substrate transfer to the heater is done manually. Therefore, the purpose of this tool is to make the rod's pressure and speed stable, and the substrate does not need to move. The results of this study are that the stepper motor achieved a remarkable speed accuracy of 99%, and the thermocouple sensor exhibited an accuracy of 88.43%. Further, the time required for the heater to reach 100 °C was 09.45 minutes.
Penyuluhan penggunaan pewarna sintetis dalam makanan bagi ibu-ibu PKK dan masyarakat di Desa Wates, Kecamatan Bumi Ratu Nuban, Lampung Tengah Yandri, Yandri; Hadi, Sutopo; Suhartati, Tati; Qudus, Hardoko Insan; Yuwono, Suripto Dwi
SINAR SANG SURYA Vol 8, No 1 (2024): FEBRUARI 2024
Publisher : UM Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/sss.v8i1.3205

Abstract

 ABSTRAK Saat ini, makanan dan minuman masih menggunakan pewarna, terutama yang terbuat dari bahan kimia sintetik. Warna produk dipengaruhi oleh penggunaan zat warna sintetik pada komponen makanan dan minuman sehingga membuat produk lebih menarik bagi konsumen. Namun penggunaan yang terus menerus akan berdampak buruk bagi kesehatan. Masyarakat, khususnya ibu-ibu PKK, harus mengetahui dengan baik tentang pewarna sintetis, risikonya, dan tindakan pencegahan keamanan untuk mengatasi masalah ini. Salah satu tindakan yang dapat dilakukan Lembaga Pengabdian Masyarakat Universitas Lampung untuk meningkatkan pemahaman ini adalah dengan melakukan penyuluhan kepada ibu-ibu PKK dan masyarakat setempat di Desa Wates, Kecamatan Bumi Ratu Nuban, Lampung Tengah, tentang risiko penggunaan pewarna sintetis pada makanan. Hasil evaluasi menunjukkan bahwa kegiatan ini berhasil meningkatkan pengetahuan peserta; dengan menggunakan metode bertingkat diperoleh rata-rata peningkatan pengetahuan peserta pelatihan sebesar 50,43%, dari kelompok rendah (3,76) ke kategori sedang (7,40).  Kata kunci: pewarna makanan, pewarna sintetis, zat aditif  ABSTRACTNowadays, food and beverages still include colours, particularly those made from synthetic chemicals. The color of the product is impacted by the use of synthetic dyes in food and beverage components, making the product more appealing to consumers. But continued usage will have a negative effect on health. The community, especially PKK women, has to be well-informed about synthetic dyes, their risks, and safety precautions in order to solve this issue. One action the University of Lampung Community Service Institute may do to raise this understanding is to counsel PKK women and the local community in Wates Village, Bumi Ratu Nuban District, Central Lampung, on the risks associated with the use of synthetic colors in food. The evaluation's findings demonstrate that this activity was successful in raising participants' knowledge levels; using the multilevel method, there was an average gain of 50.43% in trainees' knowledge, moving them from the low group (3.76) to the medium category (7.40).Keywords:, food coloring, synthetic dyes, additives 
Penyuluhan penggunaan pewarna alami dalam makanan bagi ibu-ibu PKK dan masyarakat di Desa Wates, Kecamatan Bumi Ratu Nuban, Lampung Tengah Hadi, Sutopo; Yandri, Yandri; Suhartati, Tati; Qudus, Hardoko Insan; Yuwono, Suripto Dwi
SINAR SANG SURYA Vol 8, No 2 (2024): Agustus 2024
Publisher : UM Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/sss.v8i2.3300

Abstract

Pewarna alami saat ini lebih sering digunakan pada makanan dan minuman.Hal ini adalah hasil dari meningkatnya penggunaan pada saat terhadinya pandemi Covid-19 untuk mengarah pada pola hidup sehat. Karena adanya senyawa antioksidan dan antibakteri, pewarna alami menawarkan manfaat dibandingkan pewarna sintetis. Tim dosen Jurusan Kimia FMIPA Universitas Lampung melakukan pengabdian kepada masyarakat tentang manfaat pewarna alam bagi kesehatan ibu-ibu PKK dan penduduk setempat di Desa Wates, Kecamatan Bumi Ratu Nuban, Lampung Tengah, guna menyebarkan ilmu dan informasi tersebut. Berdasarkan hasil penilaian, kegiatan ini berhasil meningkatkan pengetahuan peserta; Dengan menggunakan metode stratifikasi terlihat bahwa rata-rata pengetahuan peserta meningkat sebesar 70,33% dari kelompok rendah dengan rata-rata nilai pretes 3,80 menjadi kategori sedang dengan rata-rata nilai postes 7,32.
PENINGKATAN KESTABILAN ENZIM α–AMILASE DENGAN PENAMBAHAN GLISEROL Yandri Yandri; Nurul Nadila; Tati Suhartati; Heri Satria; Sutopo Hadi
Analit : Analytical and Environmental Chemistry Vol. 5, No. 02 October (2020) 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.v5i2.2020.p143-154

Abstract

Enzim α-amilase adalah enzim yang mengkatalisis hidrolisis ikatan α-1,4 glikosidik polisakarida menghasilkan dekstrin, oligosakarida, maltosa, dan D-glukosa. Penelitian ini bertujuan meningkatkan kestabilan enzim α-amilase hasil pemurnian dari Aspergillus fumigatus dengan penambahan gliserol. Aktivitas enzim ditentukan dengan metode Fuwa dan Mandels, sedangkan kadar protein ditentukan dengan metode Lowry. Hasil penelitian menunjukkan enzim hasil pemurnian memiliki aktivitas spesifik sebesar 1,377 U/mg meningkat sebanyak 8,1 kali dibandingkan dengan ekstrak kasar enzim yang memiliki aktivitas spesifik sebesar 0,170 U/mg. Enzim hasil pemurnian memiliki pH optimum 5,5; suhu optimum 55 °C; waktu paruh 133,26 menit. Enzim setelah penambahan gliserol 0,5; 1 dan 1,5 M memiliki pH optimum dan suhu optimum yang sama, yaitu pH 5,5 dan suhu 55 °C. Enzim setelah penambahan gliserol:  0,5 M memiliki waktu paruh 157,5 menit: 1 M memiliki waktu paruh 182,36 menit, dan 1,5 M memiliki waktu paruh 223,54 menit. Penambahan gliserol pada enzim α-amilase hasil pemurnian dari A. fumigatus dapat meningkatkan kestabilan enzim sebanyak 1,2-1,7 kali dibandingkan dengan enzim hasil pemurnian yang ditunjukkan dengan  peningkatan waktu paruh.https://jurnal.fmipa.unila.ac.id/analit/article/view/2684/1868
Sintesis, Karakterisasi, dan Uji Aktivitas Antibakteri Senyawa Organotimah(IV) 4-Nitrobenzoat Sutopo Hadi; Nova Tri Irianti; Noviany Noviany
ALCHEMY Jurnal Penelitian Kimia Vol 18, No 1 (2022): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.18.1.47872.19-29

Abstract

Dua buah senyawa organotimah(IV) yaitu berupa senyawa trifeniltimah(IV) 4-nitrobenzoat (2) dan difeniltimah(IV) di-4-nitrobenzoat (4) telah berhasil disintesis melalui reaksi antara senyawa trifeniltimah(IV) hidroksida (1) dan difeniltimah(IV) oksida (3) dengan ligan asam 4-nitrobenzoat (HNBA). Senyawa hasil sintesis dikarakterisasi dengan menggunakan spektrofotomer IR, spektrofotomer UV, spektrometer NMR dan microelemental analyzer untuk melihat kemurnian senyawa. Aktivitas biologis senyawa turunan organtotimah(IV) 4-nitrobenzoat telah diuji terhadap bakteri Gram positif Staphylococcus aureus dan Gram negatif Escherichia coli. Hasil uji dengan metode difusi agar menunjukkan senyawa 2 pada konsentrasi 200 ppm (3,87 × 10-4 M) memberikan penghambatan yang lebih efektif dibandingkan senyawa 4, senyawa awal 1 dan 3 serta ligan HNBA.Synthesis, Characterization, and Antibacterial Activity Test of Organotin(IV) 4-nitrobenzoate. Two organotin(IV) compounds, namely triphenyltin(IV) 4-nitrobenzoate (2) and diphenyltin(IV) di-4-nitrobenzoate (4) compounds have been successfully synthesized through a reaction between triphenyltin(IV) hydroxide (1) and diphenyltin(IV) oxide (3) with 4-nitrobenzoic acid (HNBA) The synthesized compounds were characterized using IR, UV, NMR spectrometer, and a microelemental analyzer to check the compound purity. The biological activity of the organotin(IV) 4-nitrobenzoate derivative was tested against Gram-positive bacteria S. aureus and Gram-negative bacteria E. coli. The test results with the agar diffusion method showed that compound 2 at a concentration of 200 ppm (3.87 x 10-4 M) provide more effective inhibition than compound 4, the starting materials 1 and 3, and the ligand HNBA.
Co-Authors Afriyani, Hapin Ahmadi, Peni Ambarwati, Yuli Ambarwati, Yuli Andi Setiawan Andi Setiawan Arai, Masayoshi Aspita Laila Bambang Irawan Bambang Irawan C. N. Ekowati Dwi Asmi Ezra Rheinsky Tiarsa Hardoko Insan Qudus Hardoko Insan Qudus Hendri Ropingi Heri Satria Heri Satria Humairoh Ratu Ayu Indah Pratiwi Irvana, Raihan Irza Sukmana John Hendri John Hendri John Hendri Juliasih, Ni Luh Gede Ratna Junaidi Junaidi Karo , Pulung Karo Khalimatus Sa’diah Lailatul Farihah Lina Marlina Lutfiah, Rosyidatul Malik, Daffa Abdul Marjunus, Roniyus Mita Rilyanti Muhammad Rizki Nadila, Nurul NANIK SUWARSO Ni Luh Gede Ratna Juliasih NOPIANI NOPIANI Nova Tri Irianti Noviany Noviany Nurul Nadila Pulung Karo-Karo Qudus, Hardoko Insan Ridho Nahrowi Setiawan, Fendi Suharso Suharso Sumardi Sumardi Supri Yanto Suripto Dwi Yuwono Suripto Dwi Yuwono Suripto Dwi Yuwono Suripto Dwi Yuwono, Suripto Dwi Surtono, Arif Syaiful Bahri SYAIFUL BAHRI Tati Suhartati Tati Suhartati Tati Suhartati Tati Suhartati Tati Suhartati Tati Suhartati Trevor G Appleton Valennisa Qunifah Wasinton Simanjuntak Wasinton Simanjuntak WAWAN ABDULLAH SETIAWAN, WAWAN ABDULLAH YANDRI AS Yandri Yandri Yandri Yandri Yandri Yandri Yandri Yandri Yandri Yandri Yandri Yandri