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All Journal Jurnal Periodic Jurusan Kimia UNP Jurnal Farmasi Medica (Pharmacy Medical Journal) PMJ Walisongo Journal of Chemistry Eksakta : Berkala Ilmiah Bidang MIPA Jurnal Farmamedika (Pharmamedica Journal) Pelita Eksakta Medfarm: Jurnal Farmasi dan Kesehatan Hydrogen: Jurnal Kependidikan Kimia CHEDS: Journal of Chemistry, Education, and Science MASALIQ: Jurnal Pendidikan dan Sains

Riga, Riga

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Author-ID : 1662585

Religion Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Energy Engineering Environmental Science Immunology & microbiology Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Physics Public Health Social Sciences Other

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The Chemistry Teacher Activities on The Training of Project Based Learning Teaching Materials Digitalisation Suryani, Okta; Sari, Trisna Kumala; Riga, Riga; Mawardi, Mawardi; Yuhelman, Nofri; Nasra, Edi; Velly, Aglin; Rahmad, Nafisah Yulia
Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 6 (2024): December 2024
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v12i6.13495

This activity is the second year of community service which is a continuation of training activities and making digital teaching materials to support project-based learning (PjBL) in sekolah penggerak for chemistry teachers in Padang city. This second year of community service activities has the theme of training to digitise project-based learning teaching materials developed at the Chemistry Musyawarah Guru Mata Pelajaran (MGMP) in Padang city. This activity aims to provide direction to Padang city chemistry teachers in implementing digital teaching materials. This community service was carried out in the lecture building of FMIPA Universitas Negeri Padang on 9 August, 16 August, and 23 August 2024. The implementation methods carried out in this community service activity are: (1) conducting a needs analysis, knowing the situation of teachers towards the implementation of PjBL-based learning through questionnaires distributed, (2) delivering material to community service participants related to PjBL and an overview of teaching materials that have been designed using the PjBL learning model explained by the speaker, then (3) delivery of materials and discussions related to differentiated learning with the PJBl learning model, and (4) delivering material related to the digitalisation of project-based teaching materials or PjBL using liveworksheet. The results of the service activities carried out can provide motivation, provide experience, and understanding for Padang city chemistry teachers regarding the digitalisation of project-based learning teaching materials so that chemistry teachers in Padang city can prepare digital chemistry teaching materials, especially with liveworksheets using the PjBL model that can assist learning activities so that learning can run effectively and efficiently in accordance with the demands of the curriculum and the times.

Implementation of Sekolah Penggerak Programme to Address Chemistry Teachers Competency on Design PjBL-based Digital Teaching Materials in Padang Suryani, Okta; Sari, Trisna Kumala; Riga, Riga; Mawardi, Mawardi; Putra, Ahadul
Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 5 (2024): October 2024
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v12i5.12952

Teaching materials for Sekolah Penggerak should be prepared based on a creative thinking learning model such as project-based learning (PjBL). However, based on the needs and situation of teachers towards the implementation of PjBL-based learning, implementation of PjBL in learning is still low, since the teachers in Padang need the advance training of preparation in PjBL learning material. The Community service activities have been carried out to provide experienced chemistry teachers in developing teaching materials based on Project-Based Learning. The implementation methods carried out in this activity are: (1) Analyzing the needs and situation of teachers towards the implementation of PjBL-based learning through questionnaires distributed, (2) Submission of material to service participants related to the PjBL learning model and syntax in this learning model explained by the speaker, then (3) Teachers are given the task of compiling and designing chemistry LKPDs using the PjBL model, (4) Teachers will present the results of the LKPD design compiled, and (5) evaluation of activities. The results of the service activities carried out can provide experience and understanding for chemistry teachers in Padang city regarding the PjBL learning model. Participants who attended this service activity could prepare chemistry teaching materials using the PjBL model so that teachers could be more innovative and creative. This activity service can provide motivation for teachers to prepare teaching materials in accordance with the demands of the Kurikulum Merdeka, especially in the implementation of project-based learning.

JAMUR ENDOFITIK BS-1 DARI BUNGA SAMBILOTO (Andrographis paniculata) PADA MEDIA PERTUMBUHAN KACANG HIJAU: SKRINING FITOKIMIA DAN AKTIVITAS ANTIOKSIDAN Aisyah, Siti; Oktria, Wandi; Silvani, Mauline Adia; Riga, Riga
MEDFARM: Jurnal Farmasi dan Kesehatan Vol 13 No 2 (2024): Medfarm: Jurnal Farmasi dan Kesehatan
Publisher : LPPM Akafarma Sunan Giri Ponorogo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.48191/medfarm.v13i2.319

Sambiloto (Andrographis paniculata) is a medicinal plant in the Acanthaceae family. A. paniculata is known to synthesize active compounds with potent antioxidant properties that effectively hinder the activity of free radicals. Further studies of the antioxidant activity of this plant can be elaborated using its endophytic fungi. This research aims to analyze phytochemicals and measure the antioxidant activity (IC50) of the endophytic fungus BS-1 in flower of sambiloto. The results of the phytochemical screening of the ethyl acetate extract (EtOAc) of the BS-1 endophytic fungus were declared positive for containing steroid, terpenoid, phenolic and alkaloid compounds. The antioxidant test results indicated a very strong free radical inhibition ability with an IC50 value = 34.61 ppm.

Utilization of Corn Cob Waste into Briquettes as Renewable Fuel in Nagari Lingkuang Aua Bandarajo Syolendra, Dwi Finna; Riga, Riga; Away, Romy Dwipa Yamesa; Saputra, Boni; Mulia, Melindra; Fitri, Bali Yana; Hidayanti, Ermia
Pelita Eksakta Vol 7 No 2 (2024): Pelita Eksakta, Vol. 7, No. 2
Publisher : Fakultas MIPA Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/pelitaeksakta/vol7-iss2/248

Pasaman District is the largest corn producer in West Sumatra Province, one of the villages is Lingkuang Aua Bandarajo, where the majority of the population work as corn farmers. This amount is directly proportional to the amount of corn cob waste produced from agricultural activities. Based on the results of observations and interviews with local communities, it is known that the processing of corn cob waste has not been carried out optimally, because people tend to burn the corn cobs, which has an impact on environmental pollution. One solution that can be provided is to hold training on processing corn cob waste into charcoal briquettes. This PKM activity was carried out offline with 3 sessions, namely a session presenting material regarding business opportunities and how to make corn cob briquettes, practice accompanied by a team and independent practice. Through this PKM activity, it is known that there has been an increase in knowledge about corn cob briquettes by the youth of the village of Aua Bandarajo. The corn cob briquettes produced can be a source of renewable fuel and can also improve the economy of local communities.

Pencil Lead Electrode Modified with Gold Thin Layer for Voltammetric Detection of Chromium (VI) Sari, Trisna Kumala; Riga, Riga; Zubir, Moondra
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 22 No. 2 (2021): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Cr(VI) is a toxic, mutagenic, and carcinogenic metal. This heavy metal have effect harmful on organism and the environment. In this study, an electroanalytic approach was improved for detection of the Cr(VI) using a pencil lead electrode modified with gold thin layer by cyclic voltammetry. Gold thin layer was electrodeposited on the pencil lead electrode surface with potential-sweeping technique at scan of potential from 1.2 V to 0 V. Since the Cr(VI) species depends on the pH, effect of supporting electrolytes matrix at various pH were investigated. It was found that Cr(VI) gave a reduction peak with a peak potential of 0.35 V vs Ag/AgCl in cyclic voltammogram with 0.1M HClO4 as supporting electrolyte. The calibration curve for Cr(VI) at gold thin layer modified pencil lead electrode shows linearity in range of 5 µM to 100 µM with a detection limit of 2.3 µM achieved.

Study of The Antibacterial Activity of Endophytic Fungus That Colonize With The Twig of Andrographis paniculata Anshar Al Khairi, Varel; Etika, Sri Benti; Suryelita, Suryelita; Ulfah, Mariam; Riga, Riga
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 22 No. 2 (2021): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Reports of the chemical constituents of Andrographis paniculata showed that this plant produced various secondary metabolites with antibacterial activity. Further exploration of bioactive compounds from A. paniculata can also be conducted by analyzing its endophytic fungi. Isolation of endophytic fungi from the twig of A. paniculata obtained three isolates of endophytic fungi. One of the isolates, RS-2, was fermented on rice media and extracted with ethyl acetate to give the EtOAc extract. The EtOAc extract from fungus RS-2 was analyzed for their antibacterial and phytochemical screening. The results exhibiting the EtOAc extract of fungus RS-2 has activity to inhibite bacterial growth. Overall, the study of the antibacterial activity of endophytic fungus obtained from the twig of A. paniculata was firstly carried out in this study

AKTIVITAS ANTIOKSIDAN DAN ANALISA FITOKIMIA JAMUR ENDOFIT DDH YANG DIISOLASI DARI DAUN DEWA (GYNURA SEGETUM) Dewita, Febby Oktavia; Riga, Riga; Silvani, Mauline Adia; Oktria, Wandi; Agustini, Dewi Meliati
CHEDS: Journal of Chemistry, Education, and Science Vol 8, No 2 (2024)
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/cheds.v8i2.9315

Dewa dewa (Gynura segetum) merupakan salah satu anggota famili Asteracease yang dilaporkan dapat menghasilkan berbagai senyawa bioaktif dan memiliki aktivitas biologis. Salah satu aktivitas tersebut adalah antioksidan. Sumber alternatif untuk mencari metabolit sekunder dengan aktivitas antioksidan dari dewa dewa adalah jamur endofitnya. Tujuan penelitian ini adalah untuk mengetahui aktivitas antioksidan jamur endofit DDH yang diisolasi dari G. segetum. Hasil uji fitokimia menunjukkan bahwa ekstrak etil asetat jamur endofit DDH mengandung senyawa terpenoid, steroid, fenolik dan alkaloid. Pada penelitian ini aktivitas antioksidan ekstrak etil asetat jamur DDH juga diuji menggunakan metode DPPH. IC50 ekstrak ini adalah 34,61 ppm yang menunjukkan aktivitas antioksidan kuat.

Co-Authors Adia Silvani, Mauline Agustini, Dewi Meliati Ahadul Putra Aini, Syamsi Anshar Al Khairi, Varel Boni Saputra Budhi Oktavia Desi Kurniawati Dewita, Febby Oktavia Dwi Finna Syolendra Dwi Rahma Doni, Deani Edi Nasra Fitri, Bali Yana Fitria, Fadhila Hary Sanjaya Hayuni, Sri Hidayanti, Ermia Iryani Iryani Jayawarsa, A.A. Ketut Khairiyah, Ghina Mulia, Melindra Nizar, Umar Kalmar Nofri Yuhelman Nur Meisinca, Dzulhijjah Oktavia Dewita, Febby Oktria, Wandi Pebriani Pebriani Pramesti, Radia Sagita Putra, Ananda Putri, Sinta Eka Rahmad, Nafisah Yulia Romy Dwipa Yamesa Away Sari, Trisna Kumala Serli, Salsabilla Putri Silvani, Mauline Adia Siti Aisyah Sri Benti Etika Suryani, Okta Suryelita, Suryelita Ulfah, Mariam Velly, Aglin Wulandari, Yolanda Yusnita, Rani Zahran, Jihan Fadhilah Zubir, Moondra

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