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INDONESIA
Indonesian Journal of Pure and Applied Chemistry
Published by Universitas Tanjungpura
ISSN : 26208571     EISSN : 2620858X     DOI : -
Core Subject : Science,
Biochemistry, Genetics & Molecular Biology Chemistry
Indonesian Journal of Pure and Applied Chemistry (IJoPAC) was first established in 2018 as a scientific journal that accommodates researchers and education practitioners to publish scientific work and research results which are the results of experiments or literature studies in the field of chemistry. Publications are carried out periodically with three issues (January-April, May-August, September-December) in one volume per year. Published scientific work can be in the form of original articles, short communications and review results covering the fields of Physical chemistry, Organic chemistry, Analytical chemistry, Inorganic chemistry, Biochemistry / Biological Chemistry, Applied Chemistry. Focus and Scope of Indonesian Journal of Pure and Applied Chemistry covering the fields : Physical chemistry Organic chemistry Analytical chemistry Inorganic chemistry Biochemistry/Biological Chemistry Applied Chemistry
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 5 Documents
 1 
Search results for , issue "Vol 2, No 1 (2019)" : 5 Documents clear
SINTESIS, UJI AKTIVITAS ANTIOKSIDAN DAN ANTIKANKER SENYAWA 3′,4′-DIMETHOXY FLAVONOL Muhamad Rokim
Indonesian Journal of Pure and Applied Chemistry Vol 2, No 1 (2019)
Publisher : Tanjungpura University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2199.46 KB) | DOI: 10.26418/indonesian.v2i1.36921

Abstract

3′,4′-dimethoxy flavonol have been synthesized from 3,4-dimethoxy-2’-hydroxychalcon under basic condition (KOH). The structures of all compounds were characterized based on the interpretation of HPLC chromatorgrams and spectroscopic data including UV, FTIR, NMR and HRMS. Antioxidant activity was evaluated using the DPPH assay and anticancer activity was evaluated using the MTS assay which showed that the 3′,4′-dimethoxy flavonol was active as antioxidants and weak anticancer activity.
SEMIKONDUKTOR BERBASIS TiO2-N/KAOLIN TERKALSINASI UNTUK DYE SENSITIZED SOLAR CELL (DSSC) Sabrina Maulidya Amir; Titin Anita Zahara; Risya Sasri; Winda Rahmalia
Indonesian Journal of Pure and Applied Chemistry Vol 2, No 1 (2019)
Publisher : Tanjungpura University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3697.056 KB) | DOI: 10.26418/indonesian.v2i1.36944

Abstract

Semikonduktor TiO2 sebagai anoda dalam dye sensitized solar cell (DSSC) memiliki kelemahan yaitu hanya aktif bekerja pada radiasi sinar UV karena energi celah pita (Eg) TiO2 yang relatif besar yaitu 3,2 eV. Pada penelitian ini, dilakukan modifikasi untuk mengubah struktur elektronik TiO2, agar dapat menurunkan Eg. Dalam penelitian ini, TiO2 didoping menggunakan atom N dari NH4OH dan kaolin terkalsinasi (KT) yang disintesis dari kaolin Capkala. Beberapa parameter yang dibahas yaitu karakteristik TiO2-N/KT hasil pendopingan, penurunan energi celah pita dari semikonduktor, dan hubungan antara Eg dari semikonduktor terhadap randemen konversi energi maksimum DSSC yang dihasilkan. Dye yang digunakan dalam penelitian ini adalah ekstrak kayu secang. Difraktogram XRD TiO2-N/KT menunjukkan posisi 2θ = 25,2790o yang menunjukkan keberadaan TiO2 dan 2θ = 26,6090oyang menunjukkankeberadaan SiO2 dari kaolin terkalsinasi. Analisis dengan FTIR menunjukkan penyerapan pada bilangan gelombang 680 cm-1 yang menunjukkan vibrasi ikatan Ti-N dan 1036,77 cm-1 yang menandakan bahwa adanya vibrasi regangan asimetris O-Si-O dan O-Al-O. Terjadi penurunan Eg dari 3,2 eV (TiO2 murni) menjadi  3,03 eV (TiO2-N/KT). Penurunan energi celah pita sebanding dengan besarnya randemen konversi energi maksimum dari sel surya yang dihasilkan yaitu sebesar 1,048 %, menunjukkan performansi lebih baik dibanding dengan DSSC dengan komponen anoda TiO2 murni (0,661%)
ENKAPSULASI FRAKSI N-HEKSAN DAUN KESUM (Polygonum Minus Huds) TERSALUT Carboxymethylcellulose (CMC) DAN PATI DAN UJI AKTIVITAS ANTIOKSIDAN DENGAN TEKNIK FREEZE DRYING Fitriani Fitriani; Muhammad Agus Wibowo; Andi Hairil Alimuddin
Indonesian Journal of Pure and Applied Chemistry Vol 2, No 1 (2019)
Publisher : Tanjungpura University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2575.834 KB) | DOI: 10.26418/indonesian.v2i1.36945

Abstract

Kesum have a scientific name Polygonum Minus Huds is one of the endemic plants originating from West Borneo.  Extracts of kesum leaf is easily damaged and the compounds contained therei are volatile. Therefore it is necessary to take measures to protect the extracts of kesum leaf. One effort that can be made to im exprove the stability of the compounds in the extract is by the process of encapsulation. This process needs to be done so that the leaf extract can last longer so it can be used for various purposes. Encapsulation aims to protect sensitive material components and reduce the degradation of the active compounds in the material. This study aims to determine the effect of mass of core materials on the efficiency of encapsulation and antioxidant activity and the effect of temperature on encapsulation. The results showed that the encapsulated with the mass of core material 10% gave the highest efficiency of 89.7%. The mass of the core material affects the encapsulation efficiency, the less the core material will provide a high value of encapsulation efficiency. Enkapsulates containing n-heksan fractions of 444.53 ppm have a lower value IC50, thus having better antioxidant activity properties. The stability of the encapsulated antioxidant activity performed at room temperature 25◦C at 10% n-hexane fraction yielded 88.36% ihibisi on day 1, 80.90% on day 3, 79.67% on day 6 and 78.04% on day 9. Activity the antioxidant encapsulant on the first day at room temperature 25◦C is better than the third, sixth and ninth days. SEM leaf extract analysis results have uneven spherical particles, no visible fracture or pore holes as large as encapsulation have round particles that are almost as large.
KARAKTERISASI FLAVONOID DARI DAUN MUNDU (Garcinia dulcis [ROXB.] KURZ) SEBAGAI PENGOMPLEKS Pb (II) Emilda Sari; Ari Widiyantoro; Gusrizal Gusrizal
Indonesian Journal of Pure and Applied Chemistry Vol 2, No 1 (2019)
Publisher : Tanjungpura University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2473.114 KB) | DOI: 10.26418/indonesian.v2i1.36946

Abstract

Pb (II) merupakan salah satu zat beracun dan berbahaya. Keberadaannya dalam tubuh manusia dapat mengganggu sistem metabolisme tubuh. Penelitian ini bertujuan untuk mengkarakterisasi flavonoid yang diisolasi dari daun mundu (Garcinia dulcis) sebagai pengompleks logam Pb (II). Tahapan penelitian yang dilakukan meliputi persiapan sampel kemudian ekstraksi, isolasi, dan pemurnian senyawa menggunakan metode kromatografi vakum cair (KVC), kromatografi kolom gravitasi (KKG), dan kromatografi lapis tipis (KLT), sedangkan identifikasi senyawa dilakukan menggunakan spektroskopi ultraungu-tampak (UV-Vis) dan inframerah (IR) serta 1H-NMR. Penelitian ini telah berhasil memperoleh 6 fraksi gabungan dari KVC dan 6 fraksi gabungan dari proses KKG. Pada fraksi F4.1 dari KKG dilakukan pemurnian lebih lanjut dengan metode kromatografi lapis tipis (KLT) preparatif sehingga diperoleh 5 isolat. Pada isolat F4.1.3 dilakukan pengujian keberadaan flavonoid dengan uji fitokimia dan hasilnya positif mengandung fenolik dan flavonoid. Selanjutnya isolat tersebut dilakukan pengujian aktivitas pengompleks terhadap logam Pb (II) 100 ppm, 200 ppm dan 300 ppm. Berdasarkan hasil pengujian UV-Vis, isolat F4.1.3 terdapat dua pita pada 287 nm dan 291 nm yang menunjukkan adanya karakteristik senyawa flavonoid. Pergeseran batokromik dari 287 nm dan 291 menjadi 289 dan 293 nm ini setelah penambahan Pb (II) menunjukkan bahwa isolat memiliki kemampuan mengkompleks Pb (II). Hasil analisis spektra inframerah (IR) dan 1H-NMR diduga isolat F41.3 adalah senyawa 5,8,4’–trihidroksi-flavan.
ISOLATION OF FLAVONOID FROM ANDONG LEAVES (Cordyline fruticosa (L.) A. Chev.) AND ITS ACTIVITY AS COMPLEXOR OF Fe2+ Herlinda Djohan; Ari Widiyantoro; Anis Shofiyani
Indonesian Journal of Pure and Applied Chemistry Vol 2, No 1 (2019)
Publisher : Tanjungpura University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1833.005 KB) | DOI: 10.26418/indonesian.v2i1.36947

Abstract

Flavonoid is one of the phenolic compounds that can complex metals. One of the native plants of Indonesia which has the potential as a metal complexor is the andong plant (Cordyline fruticosa (L.) A.Chev). The isolation process to obtain pure compound are extraction, fractionation, and separation by chromatography. Chromatography method using vacuum liquid chromatography (VLC), gravity column chromatography (GCC) and preparative thin layer chromatography (TLC). This research obtained relatively pure isolate F2.8. The IR (KBr) data on wave numbers of isolate F2.8 were 3430; 2925-2855; 1749; 1609-1512; 1171 and 1100 cm-1.The result of the spectrum 1H-NMR showed flavonoid compound has similar typical spectrum of apigenin compound which showed chemical shift (δH ppm) : 6.85 (1H, s, H-3); 6.29 (1H, s H-6); 6.57 (1H, H-8); 7.03 (2H, d, J = 11.96 Hz, H-3’, H-5’); 8.03 (2H, d, J = 11.72 Hz, H-2’, H-6’). The UV-Vis (CH3OH) spectrum data of isolate F2.8 after the addition of Fe2+ showed a shift at λmax towards a greater direction with a batochromic shift which was caused a decrease in absorbance after the addition of iron (Fe2+) 20 ppm namely: 290 nm; 305 nm with respectively absorbances of 1.62 A; 0.42 A. Based on these data, isolate F2.8 is apigenin which is capable of complexing Fe2+.

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