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All Journal Jurnal Teknik Industri Terintegrasi (JUTIN) JURNAL AGROINDUSTRI HALAL Jurnal Al-Kifayah: Ilmu Tarbiyah dan Keguruan
Purnamasari, Anita
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Agriculture, Biological Sciences & Forestry Chemistry Decision Sciences, Operations Research & Management Education Energy Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Mathematics Mechanical Engineering Social Sciences Other

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Antioxidant Activity and Total Flavonoid Propolis Stingless Bee Hasan, Akhmad Endang Zainal; Safira, Ukhradiya Maharaniq; Purnamasari, Anita; Wardatun, Sri
JURNAL AGROINDUSTRI HALAL Vol. 9 No. 2 (2023): Jurnal Agroindustri Halal 9(2)
Publisher : Universitas Djuanda

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30997/jah.v9i2.6818

Abstract

Propolis from Indonesia contains secondary metabolites which include flavonoids and other organic compounds. The ethanol extract of 70% propolis Trigona spp from Pandeglang can be used as an antibacterial compound. The purpose of this study was to examine the toxicity of the propolis and nanopropolis with an LC50 value, test the antioxidant activity with an IC50 value, and determine the total flavonoid content. LC50 was determined by the BSLT method on Artemia salina Leach larvae. The antioxidant activity was tested using the DPPH method (1,1 diphenyl-2-picrylhydrazil), and the determination of flavonoid content was carried out with aluminum chloride. The results showed that the LC50 value of propolis was 16.010 ppm, and for 20% nanopropolis was 18.689 ppm. Antioxidant activity obtained IC50 value for propolis is 95.54593 ppm, for 20% nanopropolis is 527.7939 ppm. The total flavonoid content of the propolis was 2.1123%, and the total flavonoid content for the nanopropolis equivalent extract was 1.5293%.
Penerapan Student Center Learning Untuk Peningkatan Kemampuan Berpikir Kritis Mahasiswa Tadris Matematika Pada Mata Kuliah Kalkulus Integral Herawati, Ratna; Astuti, Wiwin; Purnamasari, Anita
Jurnal Al-Kifayah: Ilmu Tarbiyah dan Keguruan Vol. 4 No. 1 (2025): Jurnal Al-Kifayah: Ilmu Tarbiyah dan Keguruan
Publisher : Sekolah Tinggi Agama Islam (STAI) Al- Kifayah Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53398/ja.v4i1.624

Abstract

Lectures are basically a relationship between lecturers and students with the purpose of lectures being the achievement of Course Learning Outcomes. Mathematics Education students have a challenge regarding the mindset that courses in the Mathematics Education study program are not easy so that they require critical logical mathematical thinking skills. Critical thinking skills were needed because they have an impact on learning outcomes. The lecture process that is centered on lecturers is one of the causes of passive classes and low critical thinking skills of students. A learning approach was needed that could foster critical thinking skills of students. This study was aims to improve the critical thinking skills students of Mathematics Education in the Integral Calculus course through the application of Student Center Learning. The method of qualitative research is the research of classroom action, the technique of data collect is non-test, namely through observation, data sources from observation sheets and students. The research results show that there is an increase in indicators of critical thinking skills before and after the action. Before the action, students can identify problems by 15% and after the action becomes 50%. Students can analyze problems, before the action by 20% and after the action 60%. Students can solve problems, before the action 15% and after the action 65%. Students can draw conclusions before the action 25%, after the action 70%. From the research results and discussion, it could be concluded that practice the Student Center Learning could improve the critical thinking skills the students of Mathematics Education in the Integral Calculus Course
Analisis Efektivitas Program Preventive Maintenance Menggunakan Metode Total Productive Maintenance (TPM) di PT Sinar Sosro Cibitung Purnamasari, Anita; Putra, Fibi Eko; Astuti, Retno Fitri
Jurnal Teknik Industri Terintegrasi (JUTIN) Vol. 8 No. 4 (2025): October
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jutin.v8i4.52029

Abstract

This study evaluates the effectiveness of the preventive maintenance program in the filling line of PT Sinar Sosro Cibitung by applying the Total Productive Maintenance (TPM) approach and measuring Overall Equipment Effectiveness (OEE). Data were collected through observations, interviews, and maintenance log documentation during September 2024. The analysis focused on three OEE components (availability, performance, and quality) and identification of the Six Big Losses. The results show that the average OEE value of the filling machine reached 92.0% (availability 94.3%; performance 98.5%; quality 99.3%), indicating performance above the world-class standard set by JIPM. The findings suggest strengthening the autonomous maintenance program and controlling production losses to ensure machine performance sustainability.
Co-Authors Akhmad Endang Zainal Hasan Astuti, Retno Fitri Astuti, Wiwin Putra, Fibi Eko Ratna Herawati Safira, Ukhradiya Maharaniq Sri Wardatun