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All Journal Jurnal Kartika Kimia Jambura Journal of Chemistry Arfak Chem: Chemistry Education Journal
Murtihapsari Murtihapsari
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Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Social Sciences

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Unsur Kelumit Esensial (Mn Dan Zn) dalam Biji Kakao (Theobroma Cacao L.) dari Daerah Perkebunan Ransiki Papua Barat Sabir Sumarna; Yunita Pare Rombe; Murtihapsari Murtihapsari; Apriani Sulu Parubak; Christiana Niken Larasati; Putri Sarera Surbakti; Arniana Anwar
Jambura Journal of Chemistry Vol 4, No 2 (2022): August
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34312/jambchem.v4i2.14595

Abstract

Cocoa is a rich source of essential minerals and contributes a significant amount of minerals in the human diet. Processed products from cocoa in the form of chocolate are in great demand by almost everyone from various statuses and social groups. The high consumption of chocolate is also not a fact that chocolate is beneficial to human health. The essential minerals (Mn and Zn) in cocoa beans are needed by the human body as a source of minerals, but if excess can be harmful to the body. The purpose of this study was to determine the content of essential trace elements in cocoa beans and their potential as raw materials for food products. The analysis method uses AAS (Atomic Absorption Spectrophotometry). The results showed the content of micronutrients (Mn and Zn) in cocoa beans at five location points with an average value of 0.8976 mg/100 g and 5.7534 mg/100 g.
DAMPAK PERILAKU KETERGANTUNGAN MEDIA SOSIAL FACEBOOK TEHADAP PRESTASI BELAJAR KOGNITIF PADA MATERI SISTEM PERIODIK UNSUR Herniwati Herniwati; Kristianus Mite; Tamar Rumihin; Murtihapsari Murtihapsari; Christiana Niken Larasati
Arfak Chem: Chemistry Education Journal Vol 2, No 2 (2019): Arfak Chem
Publisher : Universitas Papua, Manokwari, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (244.533 KB) | DOI: 10.30862/accej.v2i2.283

Abstract

Excessive use of Facebook social media among students is suspected to affect interest in learning and will have an impact on student learning achievement, especially on the material of the periodic system of elements. The purpose of this study includes the influence of Facebook social media addiction behavior on students' cognitive chemistry learning achievement. This study uses a quantitative method with an expost facto approach. The sampling technique used was purposive sampling using thirty respondents and data were collected using interviews, documentation and questionnaires. The results of this study indicate that there is an influence of Facebook's social media addiction behavior on cognitive chemistry learning achievement, which is 72%, while the relationship between Facebook's social media addiction behavior and cognitive chemistry learning achievement is related or correlated 0.852 which is categorized as very strong. Keywords: Behavior, facebook, achievement, learning
Kandungan Metabolit Sekunder dan Bioaktivitas Daun Afrika (Vernonia amygdalina) Rahel Sitompul; Sania Losiana Yomaki; Susilowati Susilowati; Faisal Faisal; Ramlah Ramlah; Yunita Pare Rombe; Hermawati Abubakar; Murtihapsari Murtihapsari
Jurnal Kartika Kimia Vol 9 No 1 (2026): Jurnal Kartika Kimia
Publisher : Department of Chemistry, Faculty of Sciences and Informatics, University of Jenderal Achmad Yani

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26874/jkk.v9i1.1062

Abstract

Daun Afrika (Vernonia amygdalina), anggota famili Asteraceae, merupakan salah satu tanaman yang telah digunakan secara tradisional di berbagai negara tropis. Tanaman ini diketahui memiliki berbagai khasiat biologis, seperti antibakteri, antioksidan, antidiabetik, dan antimikroba. Berbagai aktivitas biologis tanaman ini diduga berkaitan dengan keberadaan senyawa metabolit sekunder yang dihasilkan tanaman sebagai bagian dari mekanisme pertahanan alami, seperti flavonoid, alkaloid, triterpenoid, tanin, saponin, dan steroid yang berperan penting dalam aktivitas farmakologis. Penelitian ini bertujuan untuk mengetahui kandungan fitokimia, analisis FTIR dan GCMS serta bioaktivitas antibakteri dan antioksidan. Hasil ekstrak etil asetat daun Afrika (Vernonia amygdalina) menunjukkan adanya kandungan senyawa alkaloid, flavonoid, dan triterpenoid. Uji bioaktivitas memperlihatkan bahwa ekstrak ini memiliki aktivitas antibakteri kategori kuat dengan daya hambat tertinggi pada konsentrasi 1000 µg/mL, yaitu sebesar 12,1 mm terhadap Escherichia coli sedangkan pada Staphylococcus aureus mencapai 91 mm dengan kategori sangat kuat serta aktivitas antioksidan sedang dengan nilai IC50 sebesar 149,10 ppm. Analisis FTIR mengindikasikan keberadaan gugus hidroksil (O-H), alifatik (C-H), dan eter/alkohol (C-O) yang terkonfirmasi sebagai senyawa bioaktif. Sementara itu, hasil GC-MS teridentifikasi berdasarkan persen kemiripan senyawa utama seperti Linalool (89,23%), Neral (86,06%), Neophytadiene (91,78%), 2,6-octadienal, 3,7-dimethyl-,(E) (95,93%), Phytol (96,86%) dan 6,11-Dimethyl-2,6,10-dodecatrien-1-ol (69,85%) yang termasuk golongan terpenoid dengan aktivitas antibakteri dan antioksidan.
Co-Authors Apriani Sulu Parubak Arniana Anwar Christiana Niken Larasati Faisal Faisal Hermawati Abubakar Herniwati Herniwati Kristianus Mite Putri Sarera Surbakti RAHEL SITOMPUL Ramlah Ramlah Sabir Sumarna Sania Losiana Yomaki Susilowati Susilowati Tamar Rumihin Yunita Pare Rombe Yunita Pare Rombe