Secondary metabolite compounds contained in each plant genus have certain characteristics, which is true also of the flavonoid in the genus Artocarpus. In the experiment described here, third-year undergraduate students performed the isolation and characterization of cycloartocarpin from the roots of Artocarpus altilis (commonly known as breadfruit), giving them experience in skills such as extraction, fractionation, purification, and the structural elucidation of cycloartocarpin. Manipulation of the liquor by thin-layer and gravitation column chromatographic techniques proved to be a simple method to isolate cycloartocarpin. The flavonoid structure, cycloartocarpin, was treated with structure elucidation 1-and 2-dimensional NMR and infrared spectrometry. Students then compared the structure of the cycloartocarpin obtained with that of other flavonoids from the genus Artocarpus and other plant genera. From these comparisons, they were able to formulate structural characteristics of the flavonoid compounds of the genus Artocarpus. The laboratory method, accomplished in four, 3 h laboratory sessions, allowed students to readily understand the process of isolating flavonoids and their peculiarities.
This study aims to extract dye and alginate from seaweed Sargassum sp. as a dye paste in the coloring of Bima woven fabric. The concentration of sodium alginate used was 0%; 1%; 3% and 5%. The results showed that the absorbance value of the dye extract from seaweed Sargassum sp at maximum λ = 203 nm obtained A = 3.899. The effect of variations in the concentration of sodium alginate in the dye paste was determined by comparing the FTIR absorption pattern of Bima woven fabrics. Based on the FTIR absorption pattern data, it was found that a mixture of dye and sodium alginate of 3% had a stronger intensity, namely the wave numbers 3448.72 cm-1 and 1635 cm-1; 2900.94 cm-1; 2337.72 cm-1; 1381.03 cm-1 and 1064.71 cm-1. The results of the morphological analysis showed significant differences in surface structure on Bima woven fabrics before and after the dyeing process.
Penelitian ini bertujuan untuk mengidentifikasi senyawa turunan hasilfraksinasi kayu akar Artocarpus odoratissimus. Kayu akar A.odoratissimus dimaserasi dengan pelarut metanol. Fraksinasi dilakukanmenggunakan Kromatografi Cair Vakum (KCV) dengan variasi eluenmulai dari nonpolar sampai polar (n-heksan 100 %; n-heksan : etil asetat= 9:1 sampai 1:9; etil asetat 100%, dan etil asetat : metanol 9,5:0,5 dan9:1) menghasilkan 10 fraksi utama. Pemurnian dilakukan dengankromatografi kolom grafitasi menghasilkan 7 fraksi utama. Hasilidentifikasi berdasarkan FT-IR dan 1H-NMR menunjukan bahwasenyawa murni tersebut diduga senyawa turunan fenilpropanoid
This research has made for identification derivate compound of fractionation derivate compound of fractionation root bark Artocarpus ododratissimus. Root bark A. dodoratissimus has macerated by methanol. Fractionation by using Vacuum Liquid Choromatography with eluen variation from nonpolar till polar (n-hexane 100%; n-hexane:ethyl acetate 9:1 till 1:9; ethyl acetate 100% and ethyl acetate:methanol 9,5:0,5 and 9:1) produce main fraction. Purified by used with Gravitation Coulumb Chomatograph produce seven main fraction. Identification based on FT-IR and 1H-NMR showed that the pure compound assumed phenyl prophane derivation.Keyword: Artocarpus odoratissimus, phenyl prophane
Pembelajaran kimia menekankan pemberian pengalaman belajar secara langsung melalui penggunaan pengembangan keterampilan proses dan sikap ilmiah. Pada materi pembelajaran kimia SMA kelas X terdapat materi pokok Struktur Atom dan Sistem Periodik Unsur. Materi ini merupakan materi yang bersifat abstrak namun dapat dikonkritkan sehingga dapat diterapkan dalam pendekatan pembelajaran alat peraga. Penelitian ini dilakukan terhadap siswa kelas X SMA Negeri 2 Soromandi sebagai tidak lanjut dari hasil penilaian proses pembelajaran pada materi pokok Struktur Atom dan Sistem Periodik Unsur. Dari hasil penilaian tersebut diperoleh bahwa sebanyak 16 siswa atau sekitar 69,5% belum mencapai standar ketuntasan dan sebanyak 7 siswa atau sekitar 30,5% sudah mencapai ketuntasan minimal yaitu 70 dengan nilai rata-rata sekitar 51,7. Oleh karena itu, perlu dilakukan suatu langkah pembelajaran yang dapat mengatasi masalah tersebut yaitu dengan menggunakan media alat peraga kartu dan peta kimia atau disebut KARPET KIMIA. Penggunaan alat peraga KARPET KIMIA telah dilakukan pada materi pembelajaran Struktur Atom dan Sistem Periodik Unsur terhadap siswa kelas X SMA Negeri 2 Soromandi tahun pelajaran 2016/2017. Hasil penilaian tugas sebelum penggunaan alat peraga, jumlah siswa yang belum memenuhi kriteria ketuntasan yaitu 16 siswa atau 69,5%. Sesudah menggunakan alat peraga KARPET KIMIA, jumlah siswa yang belum tuntas sebanyak 2 siswa atau 8,7% sedangkan yang sudah memenuhi kriteria ketuntasan sebanyak 21 siswa atau 91,3%. Dari hasil tersebut diperoleh bahwa penggunaan alat peraga KARPET KIMIA sangat efektif untuk meningkatkan hasil belajar siswa pada materi Struktur Atom dan Sistem Periodik Unsur.
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