Propylene glycol alginate (PGA) is được sản xuất bởi the partial esterification of alginic acid with propylene oxide. Unlike sodium alginate, PGA remains chức năngal in acidic conditions and does not gel in the presence of calcium ions. This makes it uniquely suited for acidic food systems.
It is an excellent chất nhũ hóa and foam chất ổn định due to its surface-active properties, which are uncommon among polysaccharides. PGA được sử dụng rộng rãi in the beverage ngành công nghiệp to stabilize foam in beer and to emulsify flavor oils in soft drinks and juice beverages. It also provides smooth kết cấu and body in salad dressings, sauces, and dairy sản phẩm across a wide pH range.