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All Journal EKSAKTA: Journal of Sciences and Data Analysis Jurnal Penelitian Fisika dan Aplikasinya (JPFA) The Journal of Pure and Applied Chemistry Research EduChemia: Jurnal Kimia dan Pendidikan JC-T (Journal Cis-Trans): Jurnal Kimia dan Terapannya Jurnal Penelitian Sains Sains Natural: Journal of Biology and Chemistry Jurnal Entomologi Indonesia Jurnal Karinov JPPIPA (Jurnal Penelitian Pendidikan IPA) Studia Philosophica et Theologica Jurnal Sains dan Edukasi Sains Makara Journal of Science Prosiding Seminar Nasional Pengabdian kepada Masyarakat (SINAPMAS) Journal of Innovation and Teacher Professionalism JPP (Jurnal Pendidikan dan Pembelajaran)
Surjani Wonorahardjo
Universitas Negeri Malang
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Pengujian Aktivitas Antioksidan Vitamin C menggunakan Metode Titrasi Iodometri dan Spectroscopy UVVIS DPPH pada Sampel Minuman Kemasan Mengandung gula (with sugar) dan Tanpa gula ( less sugar ) Sahdiah, Halimahtus; Wonorahardjo, Surjani
Jurnal Penelitian Sains Vol 26, No 2 (2024)
Publisher : Faculty of Mathtmatics and Natural Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56064/jps.v26i2.1015

Abstract

Vitamin C atau asam askorbat (C6H8O6) adalah salah satu senyawa yang bersifat antioksidan yaitu senyawa yang dapat menghambat oksidasi dari efek berbahaya radikal bebas yang dapat menyebabkan penyakit penyakit degeneratif. Semakin meningkatnya kesadaran masyarakat mengonsumsi vitamin C menyebabkan munculnya banyak produk minuman kemasan mengandung vitamin C dari yang kadar rendah hingga kadar tinggi. Jenis varian minuman kemasan vitamin C kadar tinggi pun semakin beragam salah satunya varian mengandung gula (with sugar) dan varian tanpa gula ( less sugar ). Tujuan dari penelitian ini adalah untuk menguji aktifitas antioksidan vitamin C pada minuman kemasan varian mengandung gula (with sugar) dan varian tanpa gula ( less sugar ). Kadar Vitamin C minuman kemasan varian mengandung gula (with sugar) menggunakan metode titrasi iodmetri adalah sebesar 987,36 mg mendekati kadar pada etiket kemasan yaitu 1000 mg sementara varian tanpa gula ( less sugar ) sebesar 609,84 mg yaitu mengalami penurunan 40% dari kadar pada etiket kemasan. Dan hasil pengujian aktifitas antioksidan menggunakan metode spectroscopy UVVIS DPPH menunjukkan hasil IC 50 varian mengandung gula (with sugar) sebesar 7 ppm dan varian tanpa gula ( less sugar ) sebesar 21 ppm. Sehingga dapat disimpulkan keberadaan gula pada minuman kemasan memiliki potensi mencegah vitamin C teroksidasi sehingga dapat mempertahankan kadar dan sifat antioksidannya.Katakunci: antioksidan, DPPH , vitamin c, Iodomtetri, minuman kemasan, gula
Analisis senyawa volatil dari ekstrak tanaman yang berpotensi sebagai atraktan parasitoid telur wereng batang coklat, Anagrus nilaparvatae (Pang et Wang) (Hymenoptera: Mymaridae) Wonorahardjo, Surjani; Nurindah, Nurindah; Sunarto, Dwi Adi; Sujak, Sujak; Zakia, Neena
Jurnal Entomologi Indonesia Vol 12 No 1 (2015): Maret
Publisher : Perhimpunan Entomologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (352.505 KB) | DOI: 10.5994/jei.12.1.48

Abstract

Plants produce volatiles as communication cues intra- or inter- species. Infested plants by herbivores will produce volatiles as indirect defense mechanism that attracts natural enemies of herbivores. Analysis of volatiles compounds produced by rice plant as result of infested brown plant hopper (BPH), Nilaparvata lugens Stí¢l, was done to identify compounds in the volatiles that potentially can be used as attractant for egg parasitoids of BPH, Anagrus nilaparvatae (Pang et Wang) (Hymenoptera: Mymaridae). This research was an early stage to develop formulation of parasitoid attractant. The research activities include volatiles extraction of infested rice stem by BPH eggs using acetone, n-hexane as the extraction solvents; analyses of volatile compounds with GC-MS; and bioassay of parasitoid orientation behavior to the volatiles using olfactometer methods. Extraction methods applied were maceration and continuous extraction followed by concentration. Bioassay on the parasitoid orientation behavior was done by using Y-tube olfactometer and every lot of bioassay using 30 parasitoid females with 3 replicates. The results showed that the volatile compounds of extract of infested rice stem by BPH eggs comprise of 16 components. The highest proportion of the components extracted with acetone is 2-Pentanone, 4-hydroxy-4-methyl (19,9%), while those with n-hexane is Hexanedioic acid, dioctyl ester (65%). A. nilaparvatae showed positive response to the volatiles extracted from infested rice plant by N. lugens eggs. Therefore, the volatiles can be used as an attractant for the egg A. nilaparvatae to support rice pest management.
The Effectiveness of Contextual-based InstructionalMaterials of Elements of Group 15 For Inorganic Chemistry Agtri Wulandari; I Wayan Dasna; Surjani Wonorahardjo
JPP (Jurnal Pendidikan dan Pembelajaran) Vol. 26 No. 1 (2019)
Publisher : Lembaga Pengembangan Pendidikan dan Pembelajaran, Universitas Negeri Malang in Collaboration with Asosiasi Pendidik dan Pengembang Pendidikan Indonesia (APPI)

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Abstract

The purpose of research is determine the effectiveness of teaching materials based contextual elements of group 15 for the course of inorganic chemistry. The research design is one group pretest-posttet only. Subjects were students of Chemistry Education University of Palangka Raya as many as 47 people. Based on the research results, is obtained percentage of graduated postes amounted to 93.6%, mean of  n-gain score is 0,54 (moderate), and the probability value (p) is 0,000, showed no significant difference between the pretest and posttest. Therefore, teaching materials element of group 15 based on contextual for inorganic chemistry course effective to improve student’s learning result.
The Effect of Learning Management System (LMS) Assistance in Think-Pair-Share Strategy on Students’ Learning Outcomes and Motivation Ahmad Suhaili; Endang Budiasih; Surjani Wonorahardjo
JPP (Jurnal Pendidikan dan Pembelajaran) Vol. 27 No. 1 (2020)
Publisher : Lembaga Pengembangan Pendidikan dan Pembelajaran, Universitas Negeri Malang in Collaboration with Asosiasi Pendidik dan Pengembang Pendidikan Indonesia (APPI)

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Abstract

The purpose of this study was to determine the effect of Learning Management System (LMS) assistance in Think-Pair-Share (TPS) strategy and the effect of Think-Pair-Share (TPS) strategy on students’ learning outcomes and motivation. Fourty students of two science classes were involved in this study. The treatment instruments used in this study were acid-base teaching materials, syllabus, student worksheets (LKPD), lesson plans (RPP), and Learning Management System (LMS). The measurement instrument employed a test question sheet and a student motivation questionnaire. The results showed differences in learning outcomes between students who are taught with the assistance of LMS in TPS strategy compared to students who are taught using TPS only are observed. There are differences in motivation among participants. Students who are taught with the assistance of LMS in TPS strategy compared to students who are taught with TPS strategy only.
The Innovation of MOOC Based E-Marketing to Improve Entrepreneurship Administration Management for Vocational Education Students in Industrial Revolution 4.0 Era Andika Bagus Nur Rahma Putra; Amat Mukhadis; Tuwoso; Nurul Ulfatin; Surjani Wonorahardjo; Habiddin; Made Duananda Kartika Degeng; Tee Tze Kiong
JPP (Jurnal Pendidikan dan Pembelajaran) Vol. 27 No. 1 (2020)
Publisher : Lembaga Pengembangan Pendidikan dan Pembelajaran, Universitas Negeri Malang in Collaboration with Asosiasi Pendidik dan Pengembang Pendidikan Indonesia (APPI)

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Abstract

This research has aims to: (1) develop MOOCs based e marketing; (2) testing theattractiveness of MOOCs based e-marketing; and (3) knowing the level of effectiveness of MOOCs based e-marketing. The method in this study is research and development. The resultsof this study include: (1) the results of the e-marketing expert test and website marketing design expert test have a percentage: 81.50% (ease of accessing consumers), 84.10% (presentation of goods/services sold), 79.10 % variation of website content), 86.00% (compatibility with websitegoals), 83.70% (harmony of each page of views), 83.70% (complete description of products sold),83.70% (attractiveness of e-website marketing), 85.00% (ease of order process for consumers), 81.50% (responsible admin e-marketing), 81.50% (trouble shooting website problems); (2) MOOCs based e-marketing proved effective in improving the management of student entrepreneurship administration in the vocational sector in the Industrial Revolution 4.0 era, indicated by the results of the final ability test which showed significant differences between control classes without using e-marketing based MOOCs and experimental classes using MOOCs based e-marketing; and (3) E-marketing based MOOCs needs to be further developed because it can improve the management of entrepreneurial administration in vocational students in the Industrial Revolution era 4.0.
Application of Model Problem Based Learning Assisted Blended Learning on Cognitive Knowledge of University Students in Analytical Chemistry Instrument Varisky Abraham Dumanaw; Surjani Wonorahardjo; Hayuni Retno Widarti
JPP (Jurnal Pendidikan dan Pembelajaran) Vol. 27 No. 2 (2020)
Publisher : Lembaga Pengembangan Pendidikan dan Pembelajaran, Universitas Negeri Malang in Collaboration with Asosiasi Pendidik dan Pengembang Pendidikan Indonesia (APPI)

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Abstract

This study aims to determine differences in cognitive knowledge of students who are taught with a problem based learning aided by blended learning on the material of the uv-vis spectroscopy. This study uses a cognitive knowledge test instrument that has content validation of 87,92% with very good criteria and a Cronbach Alpha reliability coefficient of 0.653 in the high category. The research was conducted at the Universitas Negeri Manado in two classes. The experimental class was taught by the problem based learning model assisted by blended learning and the control class that was taught with a problem based learning model. The results showed a statistically significant difference in students' cognitive knowledge in both study classes (α = 0.050).
Co-Authors Abdulloh Fuad Ade Trisnawati Agita Dzulhajh Anggraini Agtri Wulandari Ahmad Suhaili Ahmad Suhaili Ahmad Suhaili Amat Mukhadis Amat Mukhadis Andika Bagus Nur Rahma Putra, Andika Bagus Nur Rahma Anugrah Ricky Wijaya Ar Rosyid, Hofi Hannan Chintia Rhamandica Ciptawati, Endang Dewi Yuliani, Dewi Dian Puspita Sari Dwi Adi SUNARTO Dwi Adi Sunarto Effa Rachma Pratiwi Endang Budiasih Estiyawati, Estiyawati Firmansyah Firmansyah Habiddin Hanumi Oktiyani Rusdi HASAN SUBEKTI Hayuni Retno Widarti Hidayati, Siti Nurul Hilda Srivaliana Ilham I Wayan Dasna Jakub Saddam Akbar Jayawarsa, A.A. Ketut Kusumaningrum, Irma Kartika Lestari, Ayu Rahmania Made Duananda Kartika Degeng Maharani, Chariztya Anggita Mailinda Ayu Hana Margareta Mailinda Ayu Hana Margareta Maisulah Margareta, Mailinda Ayu Hana Muhammad Hubbi Munzil Neena Zakia Noviyanti, Thjiong Angelina NURINDAH NURINDAH Nurindah Nurindah Nurkholis Nurkholis Nurkholis Nurkholis Nurul Ulfatin Pribadi, Riza Agung Putri, Adela Syiddah Ririn Andini Safi’isrofiyah Safi’isrofiyah Sahdiah, Halimahtus Salsabila, Arini Setya Ayu Aprilia Silvi Octaviani Asmi Siti Alfiah Ilmiawati Siti Marfuah, Siti SITI NURUL HIDAYATI Subandi Subandi Suharti Sujak Sujak SUJAK SUJAK, SUJAK Tee Tze Kiong Tee, Tze Kiong Tuwoso Varisky Abraham Dumanaw Varisky Abraham Dumanaw Wulandari, Agtri Yismia Ikha Sari Yudhi Utomo