Gum arabic

About: Gum arabic is a research topic. Over the lifetime, 2197 publications have been published within this topic receiving 47782 citations. The topic is also known as: acacia gum.

Acacia nilotica :A Multipurpose Tree and Source of Indian Gum Arabic

Abstract: Acacia nilotica is truly multipurpose nitrogen fixing leguminous tree in India commonly called as babul and is a source of Indian gum arabic. It is a complex species with nine subspecies, of which six are native to the African tropics and three others are native to the Indian subcontinent. It is considered as a very important economic plant since early times as a source of tannins, gums, timber, fuel, fodder and medicine. Gum is widely used as industrial, food and medicinal purposes. This article briefly reviews the botany, distribution, ecology and environment, improved techniques of gum extraction, its uses and properties. This is an attempt to compile and document information on different aspect of Acacia nilotica and its potential uses.

The improvement of lipase secretion and stability by addition of inert compounds into Acinetobacter calcoaceticus cultures.

Abstract: Acinetobacter calcoaceticus BD413 produces variable amounts of an exocellular lipase that becomes rapidly inactivated upon secretion. To achieve high yield and protect the enzyme, we assayed the addition of several inert compounds to cell-free supernatants, cell fractions, and whole cultures. Glass beads, poly(ethylene glycol) 600, Triton X-100, saccharose, gum arabic, and beta-cyclodextrin were among the compounds tested. beta-Cyclodextrin and gum arabic (and saccharose to a lesser extent) were effective enzyme stabilizers in cell-free supernatants, while gum arabic, glass beads, and Triton X-100 improved lipase secretion from cells, and, therefore, total lipase yield (30-50%, according to the additive). In whole cultures, beta-cyclodextrin was the most effective additive, particularly in combination with glass beads or gum arabic. Indeed, cultures containing beta-cyclodextrin plus gum arabic were able to maintain 95% (+/- 1.5%) of the initial lipase activity for more than 16 h, while control cultures with no additives maintained only 10% (+/- 4%) of the enzyme activity after the same period. In conclusion, the addition of inert compounds in cultures may be considered a useful approach for achieving increased yield and lipase stabilization, amenable for downstream processing.