It can be done that way. However, processing collagen is a fairly hard and expensive method. Furthermore, you are missing the point of my contribution, and that is that we contribute to the nature's cycle while at the same time removing plastics from our oceans. And one more thing. When you say "the better alternative to recycling plastic is to have biodegradable material which looks and functions like plastic. one such material is collagen" it looks like something you would write as your contribution, please do not undermine mine with your silly and already tried, expensive "solution".