Carrageenan - wikipedia Carrageenan Carrageenans or carrageenins ( / ˌkærəˈɡiːnənz / karr - ə - gee - nənz, from Irish carraigín, `` little rock '' ) are a family of linear sulfated polysaccharides that are extracted from red edible seaweeds. They are widely used in the food industry, for their gelling, thickening, and stabilizing properties. Their main application is in dairy and meat products, due to their strong binding to food proteins. There are three main varieties of carrageenan, which differ in their degree of sulfation. Kappa - carrageenan has one sulfate group per disaccharide, iota - carrageenan has two, and lambda - carrageenan has three. Gelatinous extracts of the Chondrus crispus ( Irish moss ) seaweed have been used as food additives since approximately the fifteenth century. Carrageenan is a vegetarian and vegan alternative to gelatin in some applications or may be used to replace gelatin in confectionery. Contents 1 Properties 2 Production 2.1 Semi-refined 2.2 Refined 2.3 Mixed processing 2.4 Grades 3 Uses and applications 3.1 Food and other domestic uses 3.2 Regulatory status 4 Toxicity research 5 See also 6 References 7 Further reading 8 External links Properties The molecular structures of different types of carrageenan Carrageenans are large, highly flexible molecules that curl forming helical structures. This gives them the ability to form a variety of different gels at room temperature. They are widely used in the food and other industries as thickening and stabilizing agents. All carrageenans are high - molecular - weight polysaccharides made up of repeating galactose units and 3, 6 anhydrogalactose ( 3, 6 - AG ), both sulfated and nonsulfated. The units are joined by alternating α - 1, 3 and β - 1, 4 glycosidic linkages. There are three main commercial classes of carrageenan : Kappa forms strong, rigid gels in the presence of potassium ions ; it reacts with dairy proteins. It is sourced mainly from Kappaphycus alvarezii. Iota forms soft gels in the presence of calcium ions. It is produced mainly from Eucheuma denticulatum. Lambda does not gel, and is used to thicken dairy products. The primary differences that influence the properties of kappa, iota, and lambda carrageenan are the number and position of the ester sulfate groups on the repeating galactose units. Higher levels of ester sulfate lower the solubility temperature of the carrageenan and produce lower strength gels, or contribute to gel inhibition ( lambda carrageenan ). Many red algal species produce different types of carrageenans during their developmental history. For instance, the genus Gigartina produces mainly kappa carrageenans during its gametophytic stage, and lambda carrageenans during its sporophytic stage. All are soluble in hot water, but in cold water, only the lambda form ( and the sodium salts of the other two ) are soluble. When used in food products, carrageenan has the EU additive E numbers E407 or E407a when present as `` processed eucheuma seaweed ''. Technically carrageenan is considered a dietary fibre. In parts of Scotland and Ireland, where it is known by a variety of local and native names, Chondrus crispus is boiled in milk and strained, before sugar and other flavourings such as vanilla, cinnamon, brandy, or whisky are added. The end - product is a kind of jelly similar to panna cotta, tapioca, or blancmange. Production Eucheuma denticulatum being farmed for iota - carrageenan in an off - bottom cultivation in Tanzania Although carrageenans were introduced on an industrial scale in the 1930s, they were first used in China around 600 B.C. ( where Gigartina was used ) and in Ireland around 400 A.D. Carrageen gelatin can be prepared by boiling 5 ounces ( 142 gm ) of rinsed Irish moss in 8 quarts ( 7.57 litres ) of water for 10 minutes, stirring the mixture as it boils. Two quarts ( 1.9 litres ) of cold water are rapidly added to the hot brew, and after the mixture has cooled, it is strained through a cloth. It is then cooled for 24 hours, during which time it becomes gelatinous. As of 2011, global sales of carrageenan were estimated at $640 million. The largest producer of industrial carrageenan was the Philippines, where cultivated seaweed produces about 80 % of the world supply, while China is the main exporter to global markets in the US and Europe. The most commonly used sources are E. cottonii ( Kappaphycus alvarezii, K. striatum ) and E. spinosum ( Eucheuma denticulatum ), which together provide about three - quarters of the world production. These grow from the sea surface to a depth of about 2 metres. The seaweed is normally grown on nylon lines strung between bamboo floats, and it is harvested after three months or so, when each plant weighs approximately 1 kg. The E. cottonii variety has been reclassified as Kappaphycus cottonii by Maxwell Doty ( 1988 ), thereby introducing the genus Kappaphycus, on the basis of the phycocolloids produced ( namely kappa carrageenan ). After harvest, the seaweed is dried, baled, and sent to the carrageenan manufacturer. There the seaweed is ground, sifted to remove impurities such as sand, and washed thoroughly. After treatment with hot alkali solution ( e.g., 5 -- 8 % potassium hydroxide ), the cellulose is removed from the carrageenan by centrifugation and filtration. The resulting carrageenan solution is then concentrated by evaporation. It is dried and ground to specification. There are three types of industrial processing : Semi-refined This is only performed using E. cottonii or E. spinosum. The raw weed is first sorted and crude contaminants are removed by hand. The weed is then washed to remove salt and sand, and then cooked in hot alkali to increase the gel strength. The cooked weed is washed, dried, and milled. E. spinosum undergoes a much milder cooking cycle, as it dissolves quite readily. The product is called semi-refined carrageenan, Philippines natural grade or, in the U.S., it simply falls under the common carrageenan specification. cleaned and washed seaweed ↓ extraction ↓ coarse filtration → seaweed residue ↓ fine filtration → used filter aids ↓ ↓ -- -- -- -- -- -- -- concentration -- -- -- -- -- -- -- ↓ preparation with KCl preparation with alcohol ↓ ↓ gel pressing alcohol recovery ↓ ↓ drying drying ↓ ↓ milling milling ↓ ↓ blending blending ↓ ↓ gel refined carrageenan refined carrageenan Refined The essential difference in the refining process is that the carrageenan is first dissolved and filtered to remove cell wall debris. The carrageenan is then precipitated from the clear solution either by isopropanol or by potassium chloride. Mixed processing A hybrid technology in which seaweed is treated heterogeneously as in the semirefined process exists, but alcohol or high salt levels are used to inhibit dissolution. This process is often used on South American seaweeds and gives some of the cost benefits of semirefined processing, while allowing a wider range of seaweeds to be processed, however, the naturally low cellulose levels in some South American seaweeds allow them to be heterogeneously processed and still be sold under the EU refined specification. Grades See also : Food grading This section does not cite any sources. Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. ( March 2013 ) There are two basic grades of carrageenan : refined carrageenan ( RC ) and semi-refined carrageenan ( SRC ). In the United States both grades are labeled as carrageenan. In the European Union, refined carrageenan is designated by the E number E-407, and semi-refined carrageenan as E-407a. Refined carrageenan has a 2 % maximum for acid insoluble material and is produced through an alcohol precipitation process or potassium chloride gel press process. Semi-refined carrageenan contains a much higher level of cellulosic content and is produced in a less complex process. Indonesia, the Philippines, and Chile are three main sources of raw material and extracted carrageenan. Uses and applications Food and other domestic uses Desserts, ice cream, cream, milkshakes, yogurts, salad dressings, sweetened condensed milks Sauces : to increase viscosity Beer : clarifier to remove haze - causing proteins Pâtés and processed meats ( e.g., ham ) : substitute for fat, increase water retention, increase volume, or improve slicing Toothpaste : stabilizer to prevent constituents separating Fruit Gushers : ingredient in the encapsulated gel Fire fighting foam : thickener to cause foam to become sticky Shampoo and cosmetic creams : thickener Air freshener gels Marbling : the ancient art of paper and fabric marbling uses a carrageenan mixture on which to float paints or inks ; the paper or fabric is then laid on it, absorbing the colours Shoe polish : to increase viscosity Biotechnology : to immobilize cells and enzymes Pharmaceuticals : used as an inactive excipient in pills and tablets Soy milk and other plant milks : to thicken Diet sodas : to enhance texture and suspend flavours Pet food Personal lubricants Vegetarian hot dogs Regulatory status In the U.S., carrageenan is allowed under FDA regulations as a direct food additive and is considered safe when used in the amount necessary as an emulsifier, stabilizer, or thickener in foods, except those standardized foods that do not provide for such use. FDA also reviewed carrageenan safety for infant formula. The European Food Safety Authority concluded `` there is no evidence of any adverse effects in humans from exposure to food - grade carrageenan, or that exposure to degraded carrageenan from use of food - grade carrageenan is occurring '', Furthermore, the Joint FAO / WHO expert committee on food additives stated in a July 2014 review of carrageenan `` that the use of carrageenan in infant formula or formula for special medical purposes at concentrations up to 1000 mg / L is not of concern ''. Although the National Organic Program ( NOP ) had added carrageenan to its National List of additives allowed to be included in organic foods in 2003, and reviewed and reauthorized it in 2008, noting it as `` critical to organic production and handling operations '', on November 18, 2016 the NOP 's National Organic Standards Board ( NOSB ) voted to recommend carrageenan be removed from the National List of additives allowed in organic food production. The NOSB 's recommendation is under review by the United States Department of Agriculture 's Agricultural Marketing Service ( AMS ). If the AMS accepts the NOSB 's recommendation, a proposed rule to remove carrageenan from organic foods will be published to the Federal Register no later than November 2017. In the most recent review by an independent panel, the Joint Expert Committee of the Food and Agriculture Organization of the United Nations and World Health Organization on Food Additives released a technical report in 2015 on the use of carrageenan in infant formula and found that the additive was ' not of concern ' in infant formula as food for special medical purposes at concentrations up to 1000 milligrams per litre. The use of carrageenan in infant formula, organic or otherwise, is prohibited in the EU for precautionary reasons, but is permitted in other food items. Toxicity research Carrageenan has been studied in laboratory animals for its potential effects on intestinal and immune functions following oral intake or gavage, with no effects on organ pathology, clinical chemistry, hematology, or normal health. Dietary carrageenan had no carcinogenic, genotoxic, developmental, or reproductive effects in laboratory animals, and was found to be safe in one study on human infants. See also Agar List of food additives Pectin References Jump up ^ FAO Agar and Carrageenan Manual. Fao.org ( 1965 - 01 - 01 ). Retrieved on 2011 - 12 - 10. ^ Jump up to : McHugh, Dennis J. ( 2003 ). `` A guide to the seaweed industry : FAO Fisheries Technical Paper 441 ''. www.fao.org. Food and Agriculture Organization of the United Nations. Retrieved 2017 - 07 - 29. ^ Jump up to : `` Current EU approved additives and their E Numbers ''. Food Standards Agency. 26 November 2010. Retrieved 12 August 2014. Jump up ^ http://www.marine-science.co.jp/english/goods/carra.html, Marine Science Co. Ltd. Jump up ^ DeSilver, Drew ( April 1993 ). `` Answering Machine : Carra - what ? ''. Vegetarian Times : 28. Retrieved 12 August 2014. Jump up ^ See : Loureiro, Rafael R. ; Cornish, M.L. ; Neish, Iain C. ( 2017 ). `` Applications of carrageenan : With special reference to iota and kappa forms as derived from the Eucheumatoid seaweeds ''. In Hurtado, Anicia Q. ; Critchley, Alan T. ; Neish, Iain C. Tropical Seaweed Farming Trends, Problems and Opportunities :.... Berlin, Germany : Springer International Publishing. p. 165. ISBN 9783319634982. Mitchell, M.C. ; Guiry, M.D. ( 1983 ). `` Carrageenan : a local habitation of a name ? ''. Journal of Ethnopharmacology. 9 : 347 -- 357. ^ Jump up to : Carrageenan Industry Report 2012 Contents ( PDF ) ( Report ). CyberColloids Ltd. 2012. Retrieved 6 April 2014. Jump up ^ Pareño, Roel ( 14 September 2011 ). `` DA : Phl to regain leadership in seaweed production ''. The Philippine Star. Retrieved 6 April 2014. Jump up ^ CyberColloids : E407 Specification Carrageenan, CyberColloids, Hydrocolloids research and development webpage. Jump up ^ CyberColloids : E407a Specification Processed Eucheuma Seaweed, Hydrocolloids research and development webpage. Jump up ^ 21 Code of Federal Regulations 172.620 Jump up ^ Generally Recognized As Safe 21 CRF § 182.7255 GRAS ID Code 9000 - 07 - 1 ( 1973 ) Jump up ^ Federal Food, Drug, and Cosmetic Act 21 U.S.C. 350 ( a ) § 412 Jump up ^ Opinion of the Scientific Committee on Food on Carrageenan ( 2003 ) ( 1 ) p. 5 Jump up ^ Joint FAO / WHO Expert Committee on Food Additives. Who.int. Retrieved on 2014 - 8 - 11. Jump up ^ 68 FR 61993 ( 2003 ) Jump up ^ 65 FR 80548 Jump up ^ 73 FR 59481 Jump up ^ `` Sunset 2018 Review Summary NOSB Final Review '' ( PDF ). USDA Agricultural Marketing Service. 2016 - 11 - 30. Retrieved 2017 - 02 - 15. Jump up ^ `` 78 FR 56811 ( 2013 ) '' ( PDF ). Jump up ^ Poinski, Megan ( 2016 - 11 - 18 ). `` Organic board : Carrageenan should n't be in organic food, no decision now on hydroponics ''. Food Dive. Retrieved 2017 - 02 - 16. Jump up ^ `` Safety Evaluation of Certain Food Additives, 3 '' ( PDF ). Joint Expert Committee on Food Additives, WHO Food Additive Series : 70. 2015. Jump up ^ `` Opinion of the Scientific Committee on Food on Carrageenan '' ( PDF ). European Commission, Scientific Committee on Food. 2003. ^ Jump up to : Weiner, M. L ( 2014 ). `` Food additive carrageenan : Part II : A critical review of carrageenan in vivo safety studies ''. Critical Reviews in Toxicology. 44 ( 3 ) : 244 -- 69. doi : 10.3109 / 10408444.2013. 861798. PMID 24467586. Further reading McHugh, Dennis J. FAO Fisheries Technical Paper 288 - Production and Utilization of Products from Commercial Seaweeds, Chapter 3 - Production, Properties and Uses of Carrageenan, Food and Agriculture Organization, Rome, 1987 Guiry, Michael D.R. Carrageenans, The Seaweed Site : information on marine algae. External links Food Additives : Gums and Hydrocolloids at Curlie ( based on DMOZ ) Retrieved from `` https://en.wikipedia.org/w/index.php?title=Carrageenan&oldid=828968086 '' Categories : Edible thickening agents Polysaccharides IARC Group 2B carcinogens Personal lubricants Algal food ingredients Microbicides Food stabilizers Hidden categories : Articles containing Irish - language text All articles with unsourced statements Articles with unsourced statements from April 2014 Articles containing potentially dated statements from 2011 All articles containing potentially dated statements Articles with unsourced statements from July 2009 Articles needing additional references from March 2013 All articles needing additional references Articles with Curlie links Talk Contents About Wikipedia Български Català Čeština Deutsch Eesti Ελληνικά Español فارسی Français Bahasa Indonesia Italiano Basa Jawa Magyar Nederlands 日本 語 Norsk Polski Português Русский Slovenčina Suomi Svenska தமிழ் Українська Tiếng Việt 中文 17 more Edit links This page was last edited on 5 March 2018, at 21 : 16. 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Question: which type of algae do carrageenans come from
Answer: red edible seaweeds