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All Journal Jurnal Entropi Oxygenius Journal Of Chemistry Education
Desire A. S.Rumondor
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Chemistry Education Other

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ISOLASI DAN PENENTUAN STRUKTUR METABOLIT SEKUNDER DARI HASIL HIDROLISIS BUAH PAKOBA PUTIH B.Turangan, Tiene M.; S.Rumondor, Desire A.
Jurnal Entropi Vol4, No 2, 2009
Publisher : Jurnal Entropi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (35.879 KB)

Abstract

Tujuan dari penelitian ini yaitu untuk mengisolasi dan menentukan struktur metabolit sekunder hasil hidrolisis buah pakoba putih. Metode yang digunakan adalah eksperimen dengan menggunakan kromatografi lapis tipis dan kromatografi kolom grafitasi. Hasil isolasi diperoleh isolat sebanyak 1,2 mg. Spektrum resonansi inti proton isolat menunjukkan adanya sinyal-sinyal pada pergeseran kimia 9,61 ppm untuk proton karboksilat (H-karboksilat); 6,52 ppm dan 7,21 ppm untuk Haromatik; 3,71 ppm dan 3,82 ppm untuk H-metoksi. Spektrum resonanasi magnetik inti karbon menunjukkan adanya sinyal-sinyal pada pergeseran kimia 170,64 ppm untuk C-karboksilat; 67,31 ppm untuk C-OH; 52,19 ppm dan 57,83 ppm untuk OCH3. Berdasarkan nilai pergeseran kimia spektrum RMI-1H dan RMI-13C dapat diusulkan struktur dari isolat adalah kelompok senyawa turunan asam orselinat dengan nama 2,4-dimetoksi-6-metil-benzoat.
Pengaruh Metode Demonstrasi Terhadap Hasil Belajar Siswa Pada Materi Sistem Koloid Ijing Modeong; Desire A. S. Rumondor; Septiany Ch. Palilingan
Oxygenius Journal Of Chemistry Education Vol 4 No 1 (2022): Oxygenius : Journal of Chemistry Education
Publisher : Chemistry Department, Universitas Negeri Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37033/ojce.v4i1.350

Abstract

The demonstration method is a method that can make students' attention more focused on what is being taught so that students are more active and do not feel bored in learning. This study aims to see the effect of the demonstration method on student chemistry learning outcomes on colloidal system material at SMA Negeri 1 Tutuyan in the 2020/2021 academic year. This research is a pre-experimental research with one group pretest-posttest design. The population in the study were all students of class XI IPA and the sample taken was class XI IPA MIA 1, totaling 30 people. Testing the hypothesis using the t-test formula at the significant level = 0.05. Based on the data analysis, the value of tcount = 23.90 and ttable = 2.045. The value of tcount > ttable then H1 is accepted and H0 is rejected, so it can be concluded that H1 is accepted, which means there is a significant difference between student learning outcomes on colloidal system material before and after using the demonstration method because there are differences. student learning outcomes. To find out how much the effectiveness of using the demonstration method is continued with the N-Gain test and obtained is 0.76 with high criteria.
Co-Authors Ijing Modeong Septiany C. Palilingan Tiene M. B.Turangan