Acetonitrile is a versatile solvent finding many applications in a wide range of analytical and synthetic chemistries. The optical properties of this solvent have permitted its extensive use in spectrophotometric and chromatographic work. Acetonitrile also has good solvent properties including favourable dielectric constant, high solubility parameters and low hydrogen bonding ability and as a result the solvent is used in many chemical reactions. One of its more critical applications is in the fields of protein sequencing and DNA synthesis. The chemical compound sodium alginate is the sodium salt of alginic acid. It is an extract of seaweed and is used as a thickener in the food industry and as a gelling agent and emulsifier.
Sodium Alginate is a natural amylose carbohydrate distilled from alga. It is widely applied to food, medicine, textile, printing and dyeing , paper-making and daily chemicals as thickener , emulsifier, stabilizer and binder etc. Sodium Alginate is exploring more in food application, especially since 1980s forward. It is not only a safety food additive, but also a basis material of modelling food or dietary food. As the natural cellulose, it can slow the absorption of fatty sugar .and bilesalt , reduce serum cholesterol , triglyceride in the blood. and blood sugar to prevent high blood pressure , diabetes and adiposity, the modern diseases, as well as control the accumulation of noxious metals , such .as Sr , Cd and lead . Its importance has been increasingly recognized by home and abroad, so Japanese call the food rich in sodium Alginate " longevity food ", while Americans call it "magic food additive