Agar (/ ˈ eɪ ɡ ɑːr / or / ˈ ɑː ɡ ər /), or agar-agar, is a jelly-like substance consisting of polysaccharides obtained from the cell walls of some species of red algae, primarily from “ogonori” and “tengusa”.

Agar is a phycocolloid extracted from a group of red-purple marine algae (Class Rhodophyceae) including Gelidium, Pterocladia and Gracilaria. Gelidium is the preferred source for agars. Impurities, debris, minerals and pigment are reduced to specified levels during manufacture.

Gelidiaceae, Rhodophyceae (red Algae). Geographical source: Agar is obtained mainly from Japan, Korea, South Africa, U.S.A., China, Indonesia, Australia and India. Collection and preparation: The algae are collected from May to October in …

2019年12月14日 · Learn more about the gelling agent and thickener – agar agar (E406), from production; composition; four types; uses in food, safety, side effects and so on.

According to the US Pharmacopeia, agar can be defined as a hydrophilic colloid extracted from certain seaweeds of the Rhodophyceae class. It is insoluble in cold water but soluble in boiling water. A 1.5% solution is clear and when it is cooled to 34-43°C it forms a firm gel which does not melt again below 85°C.

The main source of agar is algal phototrophs, such as Gracilaria, Gelidium, Gracilariopsis, Pterocladia, and Gelidiella species [104–107]. About 53% of the world’s total agar fabrication is extracted from two original species, Gracilariopsis and Gracilaria [107–110] .

Agar which is also known as agar-agar, is a jelly-like heteropolysaccharide formed from the cell walls of red algae, mainly from Gracilaria and Gelidiaceae. It is processed into flakes, sheets, and powder forms.

Most agar is extracted from species of Gelidium (Figure 1) and Gracilaria (Figure 2). Closely related to Gelidium are species of Pterocladia, and small quantities of these are collected, mainly in the Azores (Portugal) and New Zealand. Gelidiella acerosa is the main source of agar in India.

2020年1月21日 · Agar is one of the three main phycocolloids obtained from the aquatic environment, the other two being carrageenan and alginate. Agar is comprised of agarose and agaropectin, where the composition of each within the organism and this in turn affects the properties and applications of the agar (Armisen and Gaiatas 2009). Agar finds applications ...

Bacteriological agar is prepared mostly from Gelidium and Pterocladia. Gelidium cartilagenium collected along the West Coast of North America (Mexico) (Durrant & Sanford, 1970) is the common source of bacteriological agar in the U.S.A.