Application of green technology in gelatin extraction: a review by Mohd Noor, Nor Qhairul Izzreen, Razali, Rina Syafinaz, Ismail, Nur Khairina, Ramli, Rabiatul Amirah, Mohamad Razali, Umi Hartina, Bahauddin, Ahmad Riduan, Zaharudin, Nazikussabah, Rozzamri, Ashari, Bakar, Jamilah, Md. Shaarani, Sharifudin