Cryo-preservation is one of the most efficient methods used for storage and recovery of endangered species tissue for fertility treatment. Under low temperature conditions (~ 80K) the cells of plants and animals can be preserved in a viable state for many years. The major obstacle on a way to successful cryopreservation is the re-crystallization of water in successfully vitrified biological samples during warming-up process. We propose a neutron scattering investigation of the re-crystallization process in vitrified sample during warming up. Experimentally we are planning to study cryo-protectant solutions sample used in our previous experiment on diffractometer SANDALS. The main aim of the experiment is to determine a phase diagram and find a temperature range where re-crystallization takes place.