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All Journal Indonesian Journal of Multidiciplinary Research (IJoMR) Applied Research in Science and Technology Journal of Fibers and Polymer Composites ASEAN Journal for Science and Engineering in Materials
Girsang, Gabriela Chelvina Santiuly
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Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Education Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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How to Identify Misconception Using Certainty of Response Index (CRI): A Study Case of Mathematical Chemistry Subject by Experimental Demonstration of Adsorption Putri, Silmi Ridwan; Hofifah, Siti Nur; Girsang, Gabriela Chelvina Santiuly; Nandiyanto, Asep Bayu Dani
Indonesian Journal of Multidiciplinary Research Vol 2, No 1 (2022): IJOMR: VOLUME 2, ISSUE 1, 2022
Publisher : Universitas Pendidikan Indonesia (UPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (978.401 KB) | DOI: 10.17509/ijomr.v2i1.38738

Abstract

The purpose of this study was to identify misconceptions using the certainty of response in undergraduate students through a case study of mathematical chemistry subject by experimental demonstration of adsorption. The concept of mathematical chemistry was conveyed to students by using an explanation video. The video also directs students to do practical experiments on adsorption. The data obtained can be used to determine the isotherm adsorption model that fits with their experimental phenomena. Students analyze the data obtained by using their understanding of the mathematical chemistry concepts that have been taught. Misconceptions on students were analyzed using pretest-posttest by giving 20 questions followed by the guess level (CRI). Based on the answers given, students' understanding of the concepts being taught can be identified as understanding the concept, lucky guess, do not understand the concept, and misconceptions. This research can be used as a reference to identify misconceptions in students and can be applied in various subjects.
Folic acid conjugated poly(propylene imine) dendrimer as a nanomedicine tool for targeted drug delivery: Bibliometric analysis using google scholar indexed vosviewer Girsang, Gabriela Chelvina Santiuly; Nandiyanto, Asep Bayu Dani
Applied Research in Science and Technology Vol. 3 No. 2 (2023): Applied Research in Science and Technology
Publisher : Research and Social Study Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33292/areste.v3i2.34

Abstract

By using bibliometric analysis and data mapping with the help of the VOSViewer program, this study aims to examine the breadth of research on the subject of folic acid-conjugated PPI dendrimers for targeted drug delivery. Data was collected from the Google Scholar scientific document database using the Harzing Publish or Perish 8 application. Journal articles containing the keywords "dendrimer," "PPI," "folic acid," and "drug delivery" that were published in the years 2018 through 2023 were used as the selection criteria for the data. The selection results in the form of 221 journal articles were analyzed and mapped. The total number of research publications has increased from 2018-2021 with the highest number of publications being 64 articles (in 2021). Research publications related to the topic experienced a decline in 2022-2023 due to the global COVID-19 pandemic. The items that are very closely related to the topic have the keywords drug delivery system, treatment, cancer, and ligand. This bibliometric analysis is expected to help researchers identify research trends and recommend future research prospects.
The Effect of PVP on The Molecular Interaction, Crystallinity, and Morphology of Biopolymer Film: A Review Girsang, Gabriela Chelvina Santiuly; Khoerunnisa, Fitri; Anwar, Budiman
Journal of Fibers and Polymer Composites Vol. 3 No. 2 (2024): Journal of Fibers and Polymer Composites
Publisher : Green Engineering Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55043/jfpc.v3i2.201

Abstract

Blending of biopolymers with other polymers i.e. PVP (polyvinylpyrrolidone) is expected to improve the processability and properties of biopolymer-based films. This blending leads to the new molecular structures due to interactions between the polymers, which affect the crystallinity and morphology of the films, as results, enhance the mechanical, optical, and thermal properties of the biopolymer/PVP films. This review aims to provide an overview of the effect of PVP on the molecular interactions, crystallinity, and morphology of biopolymer films. such as chitosan, ethyl cellulose (EC), hydroxyethyl cellulose (HEC), and hydroxypropyl methylcellulose (HPMC). PVP can form hydrogen bonds with chitosan, HEC, and HPMC. Incorporating PVP with HPMC and HEC results in a uniform film morphology, whereas higher PVP ratios in chitosan/PVP blends can cause cracks, indicating the necessity for an optimal ratio to achieve a homogeneous matrix. The addition of PVP to EC results in discoidal features within the film matrix, signifying separate phases and immiscibility between PVP and EC. PVP also able to disrupts the semicrystalline structure of HEC and HPMC, making the film more amorphous.
Techno-Economic Evaluation of Gold Nanoparticles Using Banana Peel (Musa Paradisiaca) Maratussolihah, Permata; Rahmadianti, Salma; Tyas, Kanthi Pawening; Girsang, Gabriela Chelvina Santiuly; Nandiyanto, Asep Bayu Dani; Bilad, Muhammad Roil
ASEAN Journal for Science and Engineering in Materials Vol 1, No 1 (2022): AJSEM: Volume 1, Issue 1, March 2022
Publisher : Bumi Publikasi Nusantara

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

Abstract

Biosynthesis of gold nanoparticles using banana peels is considered more economical and has been proven to produce gold nanoparticles that have various applications in the medical field. Therefore, the production of gold nanoparticles needs to be developed on an industrial scale. This paper aims to determine the feasibility of a gold nanoparticle biosynthesis project using banana peels on an industrial scale. The economic evaluation method uses an analysis of several economic evaluation parameters such as GPM (Gross Profit Margin), BEP (Break-Even Point), CNPV (Cumulative Net Present Value), PBP (Payback Period), and PI (Profitability Index). The results show that on an industrial scale, it is assumed that the amount of AuNP production in one year is 120 L. The total price required for production in one year is 3,125,204.84 USD with annual sales of 3,240,000 USD so that the total price is 114,795.16 USD per year. Under ideal conditions, the PBP analysis shows that the project will have a profit in the 3rd year, and the PI analysis shows that the initial capital costs can be covered since the 4th year. The results of the analysis in some non-ideal conditions indicate that project losses will occur. Based on the economic evaluation, it can be concluded that the production of industrial-scale gold nanoparticles by biosynthetic methods using banana peels can be carried out with anticipation of losses that will occur due to changes in some ideal conditions.
Co-Authors Al-Obaidi, Abdulkareem Sh. Mahdi Asep Bayu Dani Nandiyanto Bilad, Muhammad Roil Budiman Anwar Budiman, Bentang Arief Fitri Khoerunnisa Hofifah, Siti Nur Maratussolihah, Permata Putri, Silmi Ridwan Rahmadianti, Salma Triawan, Farid Tyas, Kanthi Pawening