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All Journal JURNAL KIMIA SAINS DAN APLIKASI Jurnal Materi dan Pembelajaran Fisika
Rina Mirdayanti
Abulyatama University
Chemical Engineering, Chemistry & Bioengineering Chemistry Education Engineering Physics

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Characteristics of Edible Films Based on Corn Starch and Protein Isolates from Liquid Waste Extraction of Tofu Processing Industry Rina Mirdayanti; Amalia Amalia
Jurnal Kimia Sains dan Aplikasi Vol 23, No 6 (2020): Volume 23 Issue 6 Year 2020
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (7470.237 KB) | DOI: 10.14710/jksa.23.6.216-221

Abstract

One factor contributing to the environment's waste is industrial activity both large and small scale. During this time, the waste collection is done by dumping it into a ditch and flowing it into the river, thus worsening environmental sanitation. This study aims to analyze the character of edible films of corn starch with protein isolates from the extraction of tofu processing industry wastewater. Samples were analyzed to determine the tensile strength and elongation of the resulting film by varying the amount of protein isolates, 0%, 3%, 5%, 7% and 9%. The protein extraction process was carried out by centrifugation, while the water vapor transmission test was by the saucer method, while the identification of functional groups was through FTIR analysis. The results showed that the highest mechanical properties were obtained in the variation of 5% protein isolates with a value of 52.16 MPa and elongation of 38.4%. For water vapor transmission rate (WVTR), film comparisons were made with 5% variation of protein isolates and 0% protein isolates. Films with 5% protein isolates have a smaller water absorption of 0.56%, than films with 0% of 0.66%. The value of water vapor transmission rate shows a very significant ratio, at 5% protein isolate of water vapor transmission at 0.00176 g/m2/day, much smaller than 0% protein isolate at 0.00864 g/m2/day. IR spectra showed the presence of amide groups I and II on the results of the analysis of protein isolates. While the globular structure of proteins is shown by the absorption of wave numbers 1667 and 1650 cm-1.
Application of the Contextual Teaching and Learning (CTL) Learning Model with the Help of Quizizz as an Evaluation Media in Improving Problem Solving Ability Nur Laila; Syarifah Rahmiza Muzana; Rina Mirdayanti
Jurnal Materi dan Pembelajaran Fisika Vol 14, No 2 (2024): Jurnal Materi dan Pembelajaran Fisika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jmpf.v14i2.94162

Abstract

Literacy and numeracy in physics are still lacking which is dominated by teachers and is always considered difficult by SMA Negeri 1 Blangkejeren students, The purpose of this study was to determine the Contextual Teaching and Learning (CTL) and Quizizz learning models can improve students' problem solving skills on momentum and impulse material. The method used in this research is the Quasy experiment method with a quantitative approach and the research design is Nonequivalent Control Group Design. This research was carried out by giving a pretest-posttest class. By cluster random sampling techniques, so the samples determined were class X. The number of samples per class is 27 students. The research measurement tools used in the study were RPP and LKPD that had been prepared containing several steps of the CTL learning model that were to be realized in the teaching and learning process as well as test questions to obtain data related to the results of students' problem-solving abilities. The tests that were prepared in the form of questions included 13 questions based on ability indicators based on Bloom's Taxonomy including C1 (understanding) to C5 (evaluating). The test data provided were the average pre-test and post-test scores CTL (Contextual Teaching and Learning) learning with Quizizz evaluation media provides better results than using conventional learning models, with game-shaped questions and scores making SMA Negeri 1 Blangkejeren students compete to get better scores.
Co-Authors Amalia Amalia Nur Laila Syarifah Rahmiza Muzana