STEM field: Molecular Gastronomy (Chemistry)
Sodium alginate is an extract from seaweed. It’s a sugar polymer, or polysaccharide – a long string of sugar molecules linked together. Under a microscope it would look like a long snake made up of beads. Calcium ions grab onto two of these snakes and link them together, which makes the already thick polymer even more jelly-like. That’s why wherever the sodium alginate meets calcium ions, they form a gel.
Dr. Mom’s tips: Try making different shapes! Enjoy