Effect of ultrasound-assisted extraction on the extractability and physicochemical properties of acid and pepsin soluble collagen derived from Sharpnose stingray (Dasyatis zugei) skin

Author(s):  
Mannur Ismail Shaik ◽  
Jia Ying Chong ◽  
Norizah Mhd Sarbon
2018 ◽  
Vol 7 (3) ◽  
Author(s):  
Asri Widyasanti ◽  
Tri Halimah ◽  
Dadan Rohdiana

Tujuan dari penelitian ini adalah untuk mengetahui pengaruh amplitudo yang berbeda terhadap sifat fisikokimia ekstrak teh putih dengan menggunakan Ultrasound Assisted Extraction (UAE). Ekstraksi dilakukan menggunakan pelarut etanol 96% serta ukuran bubuk teh putih 18 mesh. Sonikasi digunakan pada amplitudo 25, 50, 75 dan 100%. Metode yang digunakan adalah percobaan laboratorium dengan analisis deskriptif. Parameter uji yang dilakukan meliputi rendemen total, kadar sisa pelarut, bobot jenis, warna, dan kadar polifenol. Hasil penelitian menunjukkan perbedaan penggunaan amplitudo pada proses ekstraksi mempengaruhi nilai rendemen ekstraksi dan mutu ekstrak dengan penggunaan amplitudo 100% sebagai perlakuan terbaik dengan nilai rendemen total sebesar 67,35%; nilai bobot jenis filtrat 0,8241; bobot jenis ekstrak sebesar 1,0306; dan kadar polifenol sebesar 0,90 mg asam galat ekivalen/g bobot kering. Hasil menunjukkan nilai yang lebih baik dibandingkan dengan maserasi dengan rendemen ekstraksi hasil maserasi 60,12 %; nilai bobot jenis filtrat 0,8163; bobot jenis ekstrak sebesar 1,0053; dan kadar polifenol sebesar 0,64 mg asam galat ekivalen/g bobot kering. Karakteristik warna ekstrak etanol teh putih seluruh perlakuan amplitudo dan maserasi menghasilkan kromatisitas warna merah. Kesimpulan dari penelitian ini adalah adanya pengaruh teknik sonikasi pada sifat fisikokimia ekstrak teh putih dan ekstraksi menggunakan amplitudo 100% menghasilkan nilai rendemen dan kadar polifenol terbaik. Extraction of White Tea by Ultrasound Assisted Extraction at Various AmplitudeAbstractThe purpose of this study was to determine the effect of different amplitudes on physicochemical properties of white tea extract using Ultrasound Assisted Extraction (UAE). Ethanol was used as solvent and material size was 18 mesh. This research used amplitude: 25, 50, 75, and 100%. The method used laboratory experiment using descriptive analysis. The parameters were total extraction total yield, residual solvent content, specific gravity, colour, and total polyphenol. The result showed that the amplitude in extraction process influenced the yield and the quality of the extract. As much as 100% amplitude was the best treatment resulted in total yield of 67.35%; the specific gravity of filtrate was 0.8241; the specific gravity of extract was 1.0306; and the polyphenol content was 0.90 mgGAE /g dryweight. The result of UAE showed a better result than hot maceration with total yield of 60.12%; specific gravity of filtrate was 0.8163; specific gravity of extract was 1.0053; and polyphenol content was 0.64 mgGAE /g dry weight. Colour characteristics of white tea ethanol extracts from all operating amplitude and hot maceration were resulting in red colour. As conclusion, ultrasound technique provided the physicochemical properties changes of extract and 100% amplitude was resulting best value of yield and polyphenol content.••••••


2022 ◽  
Vol 18 (119) ◽  
pp. 331-348
Author(s):  
Aliakbar Shahi Chehragh ◽  
Zeynab Raftani Amiri ◽  
Reza Esmaeizadeh Kenari ◽  
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