Locust bean gum

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Description

A polysaccharide produced from the seeds of the carob tree, Ceratonia siliqua, native to the Mediterranean region. Locust bean gum, or carob gum, is composed of proteins (albumins, globulins, prolamins, gluteline), carbohydrates (sucrose, dextrin pentosan, mannose, galactose), ash, fat, fiber, and moisture. Locust bean gum is produced from grinding the bean kernels of the carob tree to a fine powder. It dissolves in hot water (82 C) and cools to form a stable gel that is unaffected by pH changes or additions of salts. Solutions of locust bean gum may be gelled with an addition of 4% borate then reversed by the addition of mannitol or an acid. Locust bean gums have been detected in the wrappings of Egyptian mummies. They are excellent film formers and are currently used as dye thickeners and sizes for food, cosmetics, textiles, and paper.

Synonyms and Related Terms

locust kernel gum; carob bean gum; carob-seed gum; carob gum; St. John's bread; algarroba; Johannisbrotmehl; Arobon; Ceratonia siliqua

FTIR

AaiLOCUSTGUM.jpg


Other Properties

Soluble in hot water, cools to form gel.

CAS 9000-40-2
Molecular Weight MW about 310,000

Additional Information

R.Newman, M.Serpico, "Adhesives and Binders" in Ancient Egyptian Materials and Technology, P.Nicholson, I.Shaw (eds.), Cambridge University Press, 2000, p. 475-494.

Sources Checked for Data in Record

  • Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
  • The Dictionary of Paper, American Paper Institute, New York, Fourth Edition, 1980
  • The Merck Index, Susan Budavari (ed.), Merck Research Labs, Whitehouse Station, NJ, 12th Edition, 1996 Comment: Entry # 5384
  • Ancient Egyptian Materials and Technologies, Paul Nicholson, Ian Shaw (eds.), Cambridge University Press, Cambridge, 2000 Comment: R.Newman, M.Serpico, "Adhesives and Binders"
  • John S. Mills, Raymond White, The Organic Chemistry of Museum Objects, Butterworth Heineman, London, 2nd ed., 1994
  • I.W. Cottrell, J.K. Baird, gums chapter

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