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"Kristal minyak kapur diisolasi dari minyak Dryobalanops aromatica kemudian dioksidasi menjadi camphor. Camphor kemudian direaksikan dengan thiosemicarbazide, etil-2-chloroacetoacetate dan katalis NaOAc untuk membentuk camphor thiazole. Kemudian, senyawa tersebut direaksikan dengan hydrazine/phenylhydrazine. Kristal minyak kapur, kristal camphor, camphor thiazole, camphor thiazole hydrazine dan camphor thiazole phenylhydrazine berhasil disintesis dengan %yield masing-masing adalah 1,50%; 15,84%; 3,48%; 58,21% dan 32,65% serta dikarakterisasi menggunakan kromatografi lapis tipis (KLT), FT-IR, UV-Vis, dan GC-MS/LC-MS. Aktivitas antioksidan diukur menggunakan metode radikal bebas DPPH. Diketahui bahwa minyak kapur, Kristal minyak kapur, Camphor thiazole Hydrazine dan Camphor thiazole Phenylhydrazine memiliki aktivitas antioksidan dengan nilai IC50 secara berurutan sebesar 4293 ppm, >10.000 ppm, 6,93 ppm dan 8,80 ppm. camphor thiazole hydrazine memiliki aktivitas antioksidan paling kuat, krsital camphor tidak menunjukan aktivitas antioksidan, sedangkan camphor thiazole tidak cocok untuk dilakukan pengukuran antioksidan dengan menggunakan metode radikal bebas DPPH. Aktivitas antidiabetes diukur menggunakan enzim alfa glukosidase. Diketahui camphor thiazole, camphor thiazole hydrazine dan camphor thiazole phenylhydrazine memiliki nilai IC50 berurutan adalah 869,06 ppm, >2000 ppm dan 1893,40 ppm. Senyawa camphor thiazole diketahui memiliki aktivitas inhibisi yang paling baik terhadap enzim alfa glucosidase

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Camphor crystals were isolated from Dryobalanops aromatica oil. Camphor were reacting with thiosemicarbazide, ethyl-2-chloroacetoacetate and NaOAc catalyst to form camphor thiazole. This compound then reacted with hydrazine/phenylhydrazine. D. aromatica crystals, camphor crystals, camphor thiazole, camphor thiazole hydrazine and camphor thiazole phenylhydrazine were successfully synthesized with %yields of 1.50%; 15.84%; 3.48%; 58.21% and 32.65%, respectively and characterized using Thin Layer Chromatography (TLC), FT-IR, UV-Vis, and GC-MS/LC-MS. Antioxidant activity was measured using the DPPH free radical method. It is known that D. aromatica oil, D. aromatica crystals, camphor thiazole hydrazine and camphor thiazole phenylhydrazine have antioxidant activity with IC50 values ​​of 4293 ppm, >10,000 ppm, 6.93 ppm and 8.80 ppm, respectively. camphor thiazole hydrazine has the strongest antioxidant activity, camphor crystals do not show antioxidant activity, while camphor thiazole is not suitable for measuring antioxidants using the DPPH free radical method. Antidiabetic activity was measured using the alpha glucosidase enzyme. It is known that camphor thiazole, camphor thiazole hydrazine and camphor thiazole phenylhydrazine have IC50 values ​ 869.06 ppm, >2000 ppm and 1893.40 ppm, respectively. Camphor thiazole are known to have the best inhibitory activity against the alpha glucosidase enzyme."

"Tiazol dan Oksazol merupakan senyawa heterosiklik beranggota lima yang mengandung sulfur/oksigen dan nitrogen pada posisi 1 dan 3. Derivat kedua Senyawa ini banyak diaplikasikan dalam bidang farmasi dan kesehatan karena memiliki berbagai aktivitas biologis seperti antioksidan, analgesik, antibakteri, antikanker, antiviral, anti alergi, antihipertensi, antiinflamasi, antimalaria, antijamur, dan antipsikotik. Pada penelitian ini dilakukan sintesis senyawa derivat tiazol dan oksazol dalam dua tahap. Tahap awal, prekursor berupa tiourea dan urea direaksikan dengan etil 2-kloro asetoasetat untuk menghasilkan senyawa 1 derivat tiazol dan oksazol. Tahap akhir, senyawa 1 derivat tiazol dan oksazol direaksikan dengan hidrazin hidrat untuk menghasilkan senyawa 2 derivat tiazol dan oksazol. Reaksi awal kedua senyawa derivat tiazol dan oksazol ini didasarkan pada kondensasi Hantzsch. Senyawa derivat tiazol dan oksazol yang terbentuk kemudian dikarakterisasi dengan uji titik leleh, kromatografi lapis tipis (KLT), FTIR, UV-Vis, dan GC-MS. Senyawa 1 derivat tiazol yaitu etil 2-amino-4-metil- 1,3-tiazol-5-karboksilat berhasil disintesis dengan massa produk sebesar 2,978 gram dan kemurnian sebesar 100%. Senyawa 1 derivat oksazol yaitu etil 2-amino- 4-metil-1,3-oksazol-5-karboksilat dengan massa produk campuran sebesar 0,8351 gram dan kemurnian sebesar 4,69%. Senyawa 2 derivat tiazol dan oksazol belum berhasil terbentuk dan masih merupakan senyawa 1 derivat tiazol dan oksazol. Aktivitas antioksidan senyawa derivat tiazol dan oksazol diuji dengan metode DPPH dan didapatkan nilai IC50 sebesar 64,75; 80,73; 275,3; 280,39 ppm.

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Thiazole and oxazole are five-membered heterocyclic compounds containing sulfur/ oxygen and nitrogen in positions 1 and 3. The derivatives of these two compounds are widely applied in the pharmaceutical and medical fields because they have various biological activities such as antioxidants, analgesics, antibacterial, anticancer, antiviral, anti-allergic, antihypertensive, anti- inflammatory, antimalarial, antifungal, and antipsychotic. In this study, the syntheses of thiazole and oxazole derivatives are carried out in two stages. Initially, the precursors in the form of thiourea and urea are reacted with ethyl 2-chloro acetoacetate to produce compound 1 of thiazole and oxazole derivatives. Subsequently, compound 1 of thiazole and oxazole derivates are reacted with hydrazine hydrate to produce compound 2 of thiazole and oxazole derivatives. The initial reactions of these two thiazole and oxazole derivatives are based on the Hantzsch condensation. The formations of thiazole and oxazole derivatives are then characterized using melting point, thin layer chromatography (TLC), FT-IR, UV-Vis, and GC-MS. Compound 1 of thiazole derivative, ethyl 2-amino-4- methyl-1,3-thiazol-5-carboxylate, was successfully synthesized with mass of 2.978 gram and purity of 100%. Compound 1 of oxazole derivative, ethyl 2-amino- 4-methyl-1,3-oxazol-5-carboxylate, was obtained with mixed mass of 0.8351 gram and purity of 4.69%. Compound 2 of thiazole and oxazole derivatives have not been successfully formed and are still compound 1 of thiazole and oxazole derivatives. The antioxidant activity of thiazole and oxazole derivatives was then tested using DPPH method and their IC50 values are 64.75; 80.73; 275.3; 280.39 ppm."