Effect of Ultrasonic Assisted Extraction with Ethanol for Removing Lipid on Catfish (Pangasius sp.) Skin as a Collagen Source and Its Characteristics by Maulida Agustina, Patmawati Patmawati, Shofy Mubarok, Laksmi Sulmartiwi, Diah Anggraini Wulandari, Khadijah Zai, Raseetha Siva, Dwi Yuli Pujiastuti, Dwitha Nirmala, Money Carattri Kusuma Werdani, Oemar Moechthar, Mohamad Akmal Alwi Husein

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