*3.2.1 Chemical composition*

Natural polysaccharide gum Karaya (GK, Sterculiaurens) is a plant exudates widely available and relatively cheap biomaterial, which is used in food and medical industry. However, GK is insoluble in water and it limits subsequent processing and broader utilization in medicine. That's why it's necessary to use nanoparticles in order to limit this situation [16].

One of the key challenges with inorganic nanoparticles as a medicine delivery technology is their biocompatibility. Sugars, hydrocolloids, and plant extracts have all been proven to have the potential to be used in the green production of biocompatible gold nanoparticles.
