Article Per Year (5 Year)
p-Index From 2021 - 2026
10.071
P-Index
This Author published in this journals
All Journal Jurnal Pendidikan Sosiologi dan Humaniora JURNAL PIJAR Jurnal Inovasi Pendidikan IPA ALCHEMY Jurnal Penelitian Kimia Paedagoria : Jurnal Kajian, Penelitian dan Pengembangan Kependidikan Jurnal Pengabdian Magister Pendidikan IPA JFIOnline Jurnal Ilmu Kefarmasian Indonesia Jurnal Pengabdian Masyarakat Sains Indonesia (Indonesian Journal Of Science Community Services) Chemistry Education Practice Jurnal Ilmiah Profesi Pendidikan Journal of Classroom Action Research SPIN: Jurnal Kimia & Pendidikan Kimia Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) BIOCHEPHY: Journal of Science Education Jurnal Pijar MIPA BAHTRA: Jurnal Pendidikan Bahasan dan Sastra Jurnal Pendidikan dan Pengabdian Masyarakat Jurnal Pengabdian Inovasi Masyarakat Indonesia Jurnal Literasi dan Pembelajaran Indonesia Darma Diksani: Jurnal Pengabdian Ilmu Pendidikan, Sosial, dan Humaniora Jurnal Pendidikan MIPA Jurnal Pendidikan Progresif DIDAKTIKA
Eka Junaidi
Program Studi Pendidikan Kimia FKIP Universitar Mataram
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Economics, Econometrics & Finance Education Energy Environmental Science Health Professions Languange, Linguistic, Communication & Media Library & Information Science Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Physics Public Health Social Sciences Other

Published : 114 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 114 Documents
Search

 8   9   10   11   12 
Theoretical Study on Corrosion Inhibition Properties of 2-Isopropyl-5-Methylphenol Saprizal Hadisaputra; Saprini Hamdiani; Eka Junaidi
ALCHEMY Jurnal Penelitian Kimia Vol 11, No 2 (2015): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.11.2.710.102-110

Abstract

Corrosion inhibitors of 2-isopropyl-5-methylphenol and its derivatives has been elucidated by means of density functional theory at B3LYP/6-31G(d) level of theory. Effect of electron donating and withdrawing groups such as NH2, SH, CHCH2, CH3, OH, CHO, COOH, F and NO2 on the corrosion inhibitor of 2-isopropyl-5-methylphenol derivatives also have been studied. The quantum chemical parameters such as the frontier orbital energies (EHOMO), ionization potential (I), electron affinity (A) and electronegativity (χ) are closely related to the corrosion inhibition efficiency (IE %) of 2-isopropyl-5-methylphenol derivatives. The presence of electron donating groups increase IE % values meanwhile electron with drawing groups reduce IE % values. The enhancement of IE % follows NO2 < CHO < COOH < SH < F < CH3 < CHCH2 < OH < NH2. Electron donating NH2 group gives 96.38 % of IE %, pure 2-isopropyl-5-methylphenol IE % = 82.70 %. In contrast, electron withdrawing NO2 group gives IE % only 68.66 %. This theoretical study would have a significantly contribution for accelerating corrosion inhibitor experimental to gain optimum results.
Aktivitas Antibakteri dan Antioksidan Asam Galat dari Kulit Buah Lokal yang Diproduksi dengan Tanase Eka Junaidi; Yunita Arian Sani Anwar
ALCHEMY Jurnal Penelitian Kimia Vol 14, No 1 (2018): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.14.1.11300.131-142

Abstract

Penelitian ini mempelajari tentang produksi asam galat menggunakan enzim tanase dari limbah kulit buah lokal di Lombok. Limbah kulit buah lokal yang digunakan yaitu kulit buah kepundung (Baccaurea racemosa Muell.Arg), kulit buah juwet (Syzygium cumini), dan kulit buah manggis (Garcinia mangostana). Pada penelitian ini dilakukan pengujian asam galat yang dihasilkan, untuk mengetahui aktivitas antioksidan dan antibakteri. Pengujian sifat antioksidan dilakukan dengan menggunakan metode DPPH, sedangkan aktivitas antibakteri diuji dengan menggunakan metode difusi agar pada bakteri Escherichia coli dan Staphylococcus aureus. Hasil penelitian menunjukkan bahwa asam galat dari ketiga kulit buah memiliki aktivitas antioksidan. Asam galat dari kulit buah kepundung, kulit buah juwet dan kulit buah manggis memiliki IC50 masing-masing sebesar 5.95; 5,96; dan 5,92 ppm. Berbeda dengan kemampuan sebagai antioksidan, asam galat resistan terhadap bakteri Escherichia coli dan Staphylococcus aureus yang menunjukkan bahwa asam galat tidak memiliki aktivitas sebagai antibakteri.Antibacterial and Antioxidant Activity of Gallic Acid Extracted from Local Fruit Peels Produced by Tannase. This research studied the gallic acid production using tannase enzym from fruit local peels in Lombok. The local fruit waste used are kepundung rind (Baccaurea racemosa Muell.Arg), juwet rind (Syzygium cumini) and mangosteen rind (Garcinia mangostana). The produced Gallic acid was tested to determine its antioxidant and antibacterial activity. The antioxidant test conducted by DPPH method, meanwhile, the antibacterial activity was performed by agar diffusion method against bacteria Escherichia coli and Staphylococcus aureus. The results showed that the produce gallic acid from those three rind provide antioxidant activity. Gallic acid from kepundung rind, juwet rind, and mangosteen rind have IC50 values of 5,95; 5,96; and 5,92, respectively. Gallic acid does not showed inhibitory actions against the growth of Escherichia coli and Staphylococcus aureus. This result showed that gallic acid from local fruit waste provided no an antibacterial activity.
Chemistry Poster-Assisted Demonstration to Enhance Generic Science Skills in Redox Reaction Learning: A Quasi-Experimental Study of Grade XII Students Ni Putu Erika Pebriana; Eka Junaidi; Nora Listantia
BIOCHEPHY: Journal of Science Education Vol. 6 No. 1 (2026)
Publisher : MO.RI Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52562/biochephy.v6i1.1975

Abstract

This study examined the effect of the chemistry poster-assisted demonstration method on improving students' generic science skills in redox reaction material. The study was motivated by the low proportion of students reaching the Minimum Mastery Criteria (MMC) in redox material at SMA Negeri 1 Praya, alongside the limited use of instructional methods that present chemical phenomena directly to learners. A quasi-experimental design with a pretest–posttest control group format was employed, involving two Grade XII classes: one received the chemistry poster demonstration treatment, while the other received Discovery Learning combined with lecture-based instruction. The instrument consisted of validated and reliability-tested two-tier multiple-choice items. The mean score of the experimental class increased from 50.57 to 81.37 (moderate-to-high N-Gain), while the control class increased from 62.33 to 73.48 (low N-Gain). A paired-sample t-test produced a significance value (2-tailed) of 0.000 (p < 0.05), leading to the rejection of H? and acceptance of H?. These findings indicate that the chemistry poster-assisted demonstration method has a statistically significant effect on improving students' generic science skills in redox reaction material and may be considered a viable alternative instructional strategy for abstract chemistry topics.
Implementation of Integrated Problem-Based Learning and Storytelling Technique on Learning Outcomes and Attitudes Towards Chemistry Yunita Arian Sani Anwar; Syarifa Wahidah Al Idrus; Eka Junaidi
Jurnal Pendidikan Progresif Vol 14, No 2 (2024): Jurnal Pendidikan Progresif
Publisher : FKIP Universitas Lampung

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

Abstract

Implementation of Integrated Problem-Based Learning and Storytelling Technique on Learning Outcomes and Attitudes Towards Chemistry. Objective: This study aims to analyze the effect of problem-based learning (PBL) integrated with storytelling on learning outcomes and attitudes towards chemistry in basic chemistry courses. Methods: This experimental study employed a pretest-post-test control group design. The sample consisted of 99 new students from the Faculty of Agricultural Technology enrolled in basic chemistry courses, with 49 students in the experimental group and 50 in the control group. The research instruments included a critical thinking test with 15 validated multiple-choice questions (Cronbach's alpha = 0.817) and an attitude towards chemistry instrument based on four categories (Cronbach's alpha = 0.765). Data analysis was performed using MANOVA. Results: The results showed that the N-gain of student learning outcomes was higher in the experimental group compared to the control group. Similarly, students' attitudes towards chemistry in the experimental group, which received PBL with storytelling integration, were higher in all categories than those in the control group. The highest attitude scores in the experimental group were in the categories of attitude towards chemistry material and confidence in learning chemistry, while the lowest score was in the category of attitude towards chemistry laboratory work. In the control group, the highest score was in the category of the tendency to learn chemistry, with the lowest score matching the experimental group's lowest category. The MANOVA test indicated a significant effect of PBL with storytelling integration on both learning outcomes and attitudes towards chemistry. Conclusion: Implementing problem-based learning integrated with storytelling in basic chemistry courses positively influences learning outcomes and attitudes towards chemistry, with the experimental group showing better results compared to the control group. Keywords: attitudes towards chemistry, critical thinking, storytelling, problem based learning.DOI: http://dx.doi.org/10.23960/jpp.v14.i2.202477
Co-Authors 'Ardhuha, Jannatin Adawiah, Rabiatun Agif Suryadi Agus Abhi Purwoko Agus Abhi Purwoko Ahmad Ahmad Ahmad Kadarisman Al Idrus, Syarifah Wahidah Aliefman Hakim Aliefman Hakim Aliefman Hakim Aliefman Hakim Aliefman Hakim Aliefman Hakim Aliefman Hakim Amalia Fitri, Rizkia Anggryani, Ayu Anggryani Anjani, Surya Anwar , Yunita Arian Sani Arian Sani Anwar, Yunita Ariska, Dwi Auliya Ashyar, Mochammad Asman Ardiyansyah Atmanegara, Lalu Kusnendar Baiq Fanesa Rizkilia Kusuma BAIQ FARA DWI RANI SOFIA Baiq Fara Dwirani Sofia Baiq Fara Dwirani Sofia Baiq Fara Dwirani Sofia Baiq Fara Dwiriani Sofia Baiq Haya Ulya Rifada Baiq Nila Sari Ningsih Baqiyatusshalihah, Baqiyatusshalihah Budhiartini, Baiq Nely Burhanuddin Burhanuddin Burhanuddin Burhanuddin Burhanuddin Burhanuddin Chika Nur Narulita Cokorda Werdiyatna S dewi kastari Dinda Rizki Karina Sari Dini Handayani Diva, Felia Aura Elmawati Erfanny, Anjelina Fahmidani, Yuyum Faiqotuzzahrok, Elok Fitriani Fitriani Ghennia Dzinur Arninda Gugus Putra Pamungkas Gusti Putu Suharta Hairil Wadi Harkees Hirvad Hidayanti, Ermia Hidayati, Maulidiana I Gede Karunia Soenarko I Kadek Suartama I Made Sutajaya I Nyoman loka I Wayan Lasmawan I Wayan Suja I Wayan Widiana Irawan, Jono Istiana, Dina Jamaluddin Jamaluddin Jannatin 'Ardhuha Jannatin ‘Ardhuha Jeckson Siahaan Jeckson Siahaan Jeckson Siahaan Juliantari, Fitri Juliantari Khairun Nasirin Lalu Kusnendar Atmanegara LALU RUDYAT TELLY SAVALAS Lalu Rudyat Telly Savalas Lalu Wahri Suganda Lara Pebriana Lia, Zulfa Aulia Hasni Lian Yulianti Lilis Sulistyanti M. Iqbal Ferdiansyah M.Pd S.T. S.Pd. I Gde Wawan Sudatha . Made Astawa, Ida Bagus Made Hery Santosa Martini, Hasinah Megawati Megawati Miftah Firjatillah Mochammad Ashyar Monica Ayu Chandrai Monica Ayu Chandrai, Monica Mukhtar Haris Mukhtar Haris Muntari Muntari Muntari Muntari Murahim, Murahim Musaddat, Syaiful Muti'ah Muti'ah Muti'ah Muti'ah Muti'ah, Muti'ah Mutiah Mutiah Mutiah Mutiah Mutiah Mutiah Mutiara Rizkiandini Putri Muti’ah, Muti’ah Ni Putu Erika Pebriana Nikita Putri Nora Listantia Nova Fitrian Nur Hudayati Nur Rizki Ariyanti Nurlaila Ramdhaniah Nursyifa Hana Purnamasari, Ni Nyoman Dayuni Rabiatun Adawiah Rachmawati Rachmawati Raehani, Shafa Amina Rahman, Baiq Adila Pratiwi Rahmawati Rahmawati Rahmawati Rahmawati Rahmawati Rahmawati Raihanun, Siti Ramadhani, Siti Rumaisah Rekasawiji, Spir Senyum Restu Hidayanti Ria Duana Saptia Riska Dia Sapitri Risky Khawiyu Pasya Riza Mahendra Rizka Isnaini Rohana Sopiati Roza Hairunnisa RR. Ella Evrita Hestiandari Safrina Azaria Rahman Sanjangi Ailillah Saprini Hamdiani Saprizal Hadisaputra Saptia, Ria Duana Sarifa Wahidah Al Idrus Siti Hajar Siti Raihanun Siti Rohana Hariana Intiana, Siti Rohana Hariana Sofia, Baiq Fara Dwiriani Sopiati, Rohana Suharta, Gusti Putu Suhratul Aini Sukib Sukib Sukib Sukib Sukib Sukib Sukib Sukib Sunniarti Ariani Supriadi Supriadi Supriadi Supriadi Supriadi Suriya Ningsyih Syahrial Ayub Syahrial Ayub, Syahrial Syamsul Hariadi Syarifa Wahidah Al Idrus Syarifa Wahidah Al Idrus Syarifa Wahidah Al Idrus Syarifa Wahidah Al Idrus Syarifa Wahidah Al Idrus Syarifa Wahidah Al Idrus Syarifa Wahidah Al-Idrus Syarifa Wahidah Al-Idrus Thoyibah, Zurriyatun Uswatun Hasanah Valentina, Ni Luh Gaoura Astari Wadi, Hairil Wardana, Lalu Ali Widiantika, Susi Lestari Yayuk Andayani yayuk Andayani Yayuk Andayani Yayuk Andayani Yayuk Andayani Yayuk Andayani Yulia Agustina Yunita Arian Sani Anwar Yunita Arian Sani Anwar YUNITA ARIAN SANI ANWAR