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All Journal Jurnal Ilmu Lingkungan Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik AGRIVITA, Journal of Agricultural Science JUITA : Jurnal Informatika Indonesian Journal of Chemical Science Jurnal Global Citizen : Jurnal Ilmiah Kajian Pendidikan Kewarganegaraan Kosmik Hukum JITPI : Jurnal Ilmu Dan Teknologi Peternakan Indonesia (Indonesian Journal of Animal Science and Technology) Techno Jurnal Pengabdian Teknik dan Sains (JPTS)
Harjono Harjono
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Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Social Sciences

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Optimization Ultrasonic Assisted Extraction of Dye from African Tulip Leaves (Spathodea Campanulata P. Beauv) and Optimization of it’s Application as A Textiles Dye Silvia Tri Ayu Ningtias; Harjono Harjono; Cepi Kurniawan; Samuel Budi Wardhana Kusuma
Indonesian Journal of Chemical Science Vol 12 No 2 (2023)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijcs.v12i2.70623

Abstract

Along with the development of the textile industry in Indonesia, the use of synthetic dyes is also increasing. The use of natural dyes is an alternative to synthetic dyes because they are not toxic and harmless to the environment. African tulip leaves (Spathodea Campanulata P. Beauv) have potential as natural dyes because they contain tannins and flavonoids. African tulip leaf dyes were obtained by Ultrasound-assisted Extraction (UAE) extraction with variations in extraction times of 15, 30, 45 and 60 minutes with the solvents used, namely ethanol and methanol. This research was conducted with the aim of knowing the effect of the type of solvent and extraction time on the dye content and test the resistance of the dye extract to washing. The results showed that the most optimal time for extraction of UAE in ethanol solvent was 15 minutes and methanol was 30 minutes. The process of applying the dye used the mordant KAl(SO4)2 and FeSO4 with various concentrations (0, 10, 20, 30 g/L) to increase the fastness to washing. The best results were shown by cotton cloth with the KAl(SO4)2 mordant at a concentration of 30 g/L, while the FeSO4 mordant at a concentration of 10 g/L was proven by a low ∆E value. The characterization results of African tulip leaf extract using FTIR and UV-Vis spectrophotometer showed the presence of flavonoids and tannins in the extract characterized by the presence of functional groups O-H, C-H, C=C, C=O, C-O-C, and C-O and the presence of peaks in the flavonoid absorption area and the visible light region at a wavelength of 662 and 660 nm.
Extraction of Natural Dyes from Babadotan Leaves (Ageratum conyzoides L.) using Ultrasound-Assisted Extraction Method and Its Utilization in Fabric Dying Amalia Rahmawati; Harjono Harjono
Indonesian Journal of Chemical Science Vol 12 No 2 (2023)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijcs.v12i2.71669

Abstract

Natural dyes are used as an alternative to synthetic dyes which have a negative impact on human health and the environment. Plants that can be applied as natural dyes are babadotan weed. In this study, extraction of natural dyes from babadotan leaves was carried out using the UAE method. Identification of compounds contained in dyes using UV-Vis instruments, FTIR, phytochemical tests, and total tannin and flavonoid tests. The yield test on the extracted extract showed that 70% ethanol extract produced the highest value when compared to other samples. The results of the phytochemical test showed that the three extract samples positively contained tannins, while the flavonoid phytochemical test showed that the aquadest extract positively contained flavonoids. The results of the FTIR instrument test show that the three extract samples produce functional groups contained in tannin compounds. The test results of the UV-Vis spectrophotometer instrument indicated the possibility of a C=O chromophore. The total tannin content test showed that the 70% ethanol viscous extract showed the highest value, while the total flavonoid content test showed that the aquadest viscous extract showed the highest value. Dyeing fabrics treated with FeSO4 mordant showed more intense color results when compared to fabrics treated with other mordant. Stability test of dyed fabrics against washing with detergent and drying in direct sunlight for 6 hours showed good color fastness.
Optimasi Ekstraksi dan Uji Aktivitas Antioksidan Bunga Tulip Afrika (Spathodea campanulata P) dengan Metode Ultrasound-Assisted Extraction Alika Rindangsari Nurrahmah; Harjono Harjono; Nanik Wijayati; Sigit Priatmoko
Indonesian Journal of Chemical Science Vol 12 No 1 (2023)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijcs.v12i1.67875

Abstract

Antioksidan alami dapat diperoleh dari tumbuhan berupa vitamin C, flavonoid, dan fenolik senyawa ini dapat bereaksi dengan pereduksi penangkap radikal bebas. Penelitian ini bertujuan untuk menentukan optimasi ekstraksi dan uji aktivitas antioksidan bunga tulip afrika dengan metode Ultrasound Assisted Extraction. Tahapan penelitian ini optimasi ekstraksi menentukan absorbansi dengan spektrofotometer UV. Hasil data optimal ekstrak bunga tulip afrika kemudian di uji aktivitas antioksidan dengan menggunakan metode DPPH dan penentuan kandungan total fenol.Hasil optimal ekstrak bunga tulip afrika ditunjukkan pada kadar 35%, waktu optimal menit ke 45 dengan rasio massa terhadap pelarut pada perbadingan 1:5. Hasil ekstrak optimal mengandung senyawa golongan fenol dibuktikan dengan uji penentuan kandungan total fenol. Nilai kandungan total fenol ekstrak tanpa penambahan asam sitrat yaitu sebesar sampel 2,9818 mgGAE/g sedangkan ekstrak bunga tulip afrika dengan asam sitrat sebesar 3,2036 mgGAE/g sampel. Adanya kandungan aktivitas antioksidan pada ekstrak bunga tulip afrika dilakukan pengujian aktivitas antioksidan dengan menggunakan metode DPPH. Aktivitas antioksidan pada ekstrak bunga tulip afrika tanpa penambahan asam diperoleh hasil nilai IC50 sebesar 93,073 ppm (µg/mL), sedangkan pada ekstrak bunga tulip afrika dengan penambahan asam diperoleh nilai IC50 sebesar 77,554 ppm (µg/mL).
Pelatihan Pembangunan Jaringan Komputer Dalam Perencanaan Arsitektur Jaringan Komputer Kabupaten Banyumas Harjono Harjono
Jurnal Pengabdian Teknik dan Sains (JPTS) Vol 1, No 1 (2021): Januari 2021
Publisher : Lembaga Publikasi Ilmiah dan Penerbitan (LPIP)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30595/.v1i1.9373

Abstract

Dalam penyusunan rencana pembangunan tersebut dibutuhkan data pendukung yang lengkap dan valid, baik dari data kondisi makro pembangunan maupun data mikro untuk setiap bidang/sektor pembangunan yang dilaksanakan.    Ketersediaan data dan informasi pembangunan tersebut sangatlah penting sebagai dasar agar diperoleh sebuah dokumen perencanaan dengan tingkat akurasi yang tinggi dalam upaya mengatasi permasalahan yang ada serta mengantisipasi perkembangan dan permasalahan yang mungkin akan muncul di masa yang akan datang.Agar data-data tersebut dapat diperoleh dengan lancar, maka diperlukan jaringan komunikasi data yang terintegrasi antar SKPD (Satuan Kerja Perangkat Daerah).  Jaringan komunikasi data tersebut, yang berikutnya digunakan istilah Jaringan Komputer pada umumnya saat ini telah dibangun oleh Kantor Pengolahan Data Elektronik (KPDE).  Jaringan Komputer yang dibangun oleh KPDE setiap saat dilakukan pengembangan ataupun perbaikan, yang menggunakan dana APBD (Anggaran Pendapatan dan Belanja Daerah) dalam bentuk program dan kegiatan yang diusulkannya.  Badan Perencanaan Pembanguna Daerah (Bappeda) Kabupaten Banyumas sebagai koordinator terhadap matriks kerja tiap SKPD perlu kiranya memahami beberapa dasar Jaringan Komputer untuk mendukung pembangunan infrastruktur jaringan komputer yang dibangun KPDE dan memanfaatkan jaringan komputer tersebut untuk mengkoordinir SKPD-SKPD untuk melaporkan matriks kegiatannya.
Analysis of Digital Legal Acceptance based on the Technology Acceptance Model 3 (TAM3) Siti Nur Azizah; Hermin Endratno; Harjono Harjono
Kosmik Hukum Vol 22, No 3 (2022)
Publisher : Universitas Muhammadiyah Purwokerto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30595/kosmikhukum.v22i3.15647

Abstract

This study aims to analyze the acceptance of the PeduliLindungi application from a public perspective using the Technology Acceptance Model (TAM) concept. The government requires the PeduliLindung application to track community activities through the Decree of the Minister of Communication and Informatics No. 171 of 2020. The Indonesian government hopes that this application records the mobility of infected patients and becomes a solution to reduce the transmission of COVID-19. However, PeduliLindungi is a new application that developed after the pandemic. Thus, the user acceptance of this app is questionable. This is a survey analysis from 102 respondents using Structural Equation Model-PLS. The results found that perceived usefulness, system failure, and social influences affect the user intent of the PeduliLindungi app while perceived ease of use is not. This app was applicable to record individual movement as virus prevention in the future. This is a contribution to theory and practice in economics and business. In theory, this research provides a new and more comprehensive view of fundamental human behaviour idea. In practice, this research is able to measure the effectiveness of government regulations in responding to an unexpected global crisisKeywords: Behavioral Intention, Technology Acceptance Model, PeduliLindungi App
Co-Authors . Suwarsito Achmad Fauzan Agung Purwo Wicaksono Ali Djamhuri Alika Rindangsari Nurrahmah Amalia Rahmawati Anak Agung Gede Sugianthara Cepi Kurniawan Dharmawan Hadi Santoso Feryani Aldyningtys Heri Mulyanti Hermin Endratno Ismawati septiningsih Itok Dwi Kurniawan ITOK DWI KURNIAWAN Lahan Adi Purwanto Lukmanul Akhsani Malim Muhammad Mastur Mastur Mrabawani Insan Rendra Muhammad Hamka Nanik Wijayati Nora Nurmatya Grafidth Oki Ria Hermawan Putra, Ryan Aryadin Rizki Andhestria Adhi Samuel Budi Wardhana Kusuma Sigit Priatmoko Silvia Tri Ayu Ningtias Siti Muslimah Widyastuti Siti Nur Azizah Soehartono Soehartono Sri Wahyuningsih Yulianti Sugiarto Sugiarto Taman Ginting, Taman Taufik Nurhidayat Tito Pinandita Uhud Abdullah Wiwik Handayani Yusuf Akhyar Sutaryono Zakki Adlhiyati