Habit Analysis of Sodium Alginate in 2017

Sodium alginate is derived frombrown algagenerickelporsea grapeMiddle extractioniodineandmannitolSubsequentby-productIts molecule consists of β -D- mannuronic acid (β -D-mannuronic, m) and α -L- guluronic acid (α -l -L-guluronic, g) press (1→ 4) key connection. The aqueous solution of sodium alginate has high viscosity and has been used as food.Thickener、stabilizing agent、emulgatorWait. Sodium alginate is a non-toxic food, which was included in the United States Pharmacopoeia as early as 1938. Sodium alginate contains a lot of — COO－-,which can show polyanionic behavior in aqueous solution and has certain adhesion, can be used as a drug carrier for treating mucosal tissue. Under acidic conditions, — COO－-into — COOH，ionization degreeWhen decreasing, the hydrophilicity of sodium alginate decreases, the molecular chain shrinks and the pH value increases, — COOH group dissociates constantly, and the hydrophilicity of sodium alginate increases and the molecular chain stretches. Therefore, sodium alginate has obvious pH sensitivity. Sodium alginate can quickly form gel under extremely mild conditions, when Ca2+, Sr2+ and so on are present.cationWhen it exists, Na+ on G units reacts with divalent cations, and G units pile up to form cross-linked network structure, thus forming hydrogel. Sodium alginate formationgelMild conditions, which can avoid sensitive drugs, protein,cellandenzymeInactivation of such active substances. Because of these excellent characteristics, sodium alginate has been widely used in food industry and medicine.Seaweed is a general term for marine algae such as kelp, laver, Undaria pinnatifida, and cauliflower, which grows in the sea and is a cryptophyte in the plant kingdom. Algae include several different kinds of organisms that generate energy through photosynthesis. However, how much do you know about the growth habits of seaweed? How much do you know about its reproductive elements? Today, Xiaobian leads everyone to take a brief look.

　　Growth habit of algae

　　Growing in the shallow sea area below the low tide line — Where the ocean meets the land, the impact of the waves is relatively mild. The seawater is rich in minerals, and there is plenty of sunshine. No matter whether it is red algae or brown algae with different colors, they all contain chlorophyll. They can use sunlight for photosynthesis to make food. When they do photosynthesis, the oxygen released is indispensable for animals to breathe. The reason why the sea world is so colorful and lively is that seaweed has contributed a lot.

　　Reproductive elements of seaweed

　　Although algae have no structures such as flowers, fruits and seeds to reproduce, they have various reproductive ways to adapt to the environment. In asexual reproduction, some cells can be directly divided into two parts, such as Spirogyra, which can be broken into several segments, and each segment will grow into an independent individual; Some algae can produce many flagellated spores that can swim freely, and each spore grows into a new individual when it matures; When the environment is bad, some algae can produce thick-walled resting spore, and when the environment is suitable, they will sprout and grow into new individuals. In sexual reproduction, some algae can produce female and male gametes, which grow into new individuals after mating.

　　In the life of algae, asexual reproduction and sexual reproduction often alternate regularly, forming a complex life history. For example, laver and kelp, which we often eat, have different growth forms of sporophyte and gametophyte. The sporophyte produces spores while the gametophyte produces female and male gametes, which is called "generation alternation".