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β-d-galactosidase; an enzyme in the intestinal mucosa that hydrolyzes lactose, producing glucose and galactose.
lactase deficiency a deficiency of intestinal lactase, which causes abdominal distention and cramping and often diarrhea when milk is drunk. The condition is usually hereditary with an onset between infancy and early adulthood, and is more common in Blacks, American Indians, and East Asians (70 to 90 per cent) than in Whites (10 to 15 per cent). It may also occur secondary to massive small bowel resection or to diseases involving the mucosa, such as celiac disease, Crohn's disease, tropical sprue, and ulcerative colitis.


An enzyme that catalyzes the hydrolysis of lactose into d-glucose and d-galactose, as well as the hydrolysis of other β-d-galactosides; it also catalyzes galactotransferase reactions; a deficiency of β-d-galactosidase leads to problems in the intestinal digestion of lactose; used in the production of milk products for adults who lack the intestinal enzyme; a defect of one isozyme of β-d-galactosidase is associated with Morquio syndrome type B. Compare: lactase persistence, lactase restriction.
Synonym(s): lactase


An enzyme occurring in certain yeasts and in the intestinal juices of mammals and catalyzing the hydrolysis of lactose into glucose and galactose.


A gene on chromosome 3p21.33 that encodes beta-galactosidase-1, a lysosomal enzyme that hydrolyses the terminal beta-galactose from gangliosides and other glycoconjugates.

Molecular biology
GLB1 mutations cause GM1-gangliosidosis and mucopolysaccharidosis IV (Morquio B syndrome).


Abbreviation for beta.


(β) (bā'tă)
1. Second letter of the Greek alphabet.
2. chemistry Denotes the second in a series, the second carbon from a functional (e.g., carboxylic) group, or the direction of a chemical bond toward the viewer. For terms with the prefix β, see the specific term.


An enzyme that brings about the HYDROLYSIS of LACTOSE to glucose (dextrose) and galactose. Beta-galactosidase.


an enzyme that splits the disaccharide LACTOSE into galactose and glucose, secreted as part of the intestinal juice by glands in the SMALL INTESTINE wall. Lactase is also produced in ENZYME INDUCTION by bacteria (see OPERON MODEL).
References in periodicals archive ?
While some alternatives to milk are fortified with calcium and vitamin D, only Lactaid is real milk with all the nutrients of milk.
In her position, she implements marketing strategies for products such as Viactiv and Lactaid, but she is best known for transforming Splenda into a best-selling sugar substitute.
HP Hood is introducing Lactaid Scoopfuls, a new line of 100% lactose-free ice cream that can be enjoyed by lactose-intolerant consumers.
Today, consumers have access to lactose-free products like milk, cheese, and ice cream as well as Lactaid tablets, which let lactose-sensitive people have dairy products.
Lactaid milk, which has had some of its milk sugar removed and is low in lactose, may not cause problems.
* If you are lactose intolerant, buy lactose-free milk, use Lactaid drops for meals containing milk, enjoy smaller servings of milk with meals or eat more yogurt or low fat cheese within tolerable limits.
Treating milk with a lactase supplement (e.g., Lactaid) or taking the supplement orally before eating dairy products may prevent the symptoms.
Lactase is also available in Lactaid drops to be mixed into milk.
$ TOP BRANDS (MILLIONS) YEAR AGO SHARE Private label $5,299.4 -14.7% 63.1% Dairy 559.3 NA 6.7 Hood Lactaid 375.3 9.5 4.5 Horizon Organic 336.4 1.6 4.0 Prairie Farms 146.3 -12.9 1.7 Hiland 134.6 -12.5 1.6 Organic Valley 95.2 -3.4 1.1 Hood 77.8 -3.7 0.9 Kemps Select 56.2 1.5 0.7 Country Fresh 51.4 -12.3 0.6 CATEGORY TOTAL 8,404.6 -12.7 100.0 UNIT SALES CHANGE VS.
One popular brand name, Lactaid, is available in tablets and liquid form.
If your body doesn't make its own lactose-digesting enzymes, you can buy them in pills like Lactaid, Lactase, and Dairy Relief.
In a separate review, recently selected and tested 10 different lactase supplements and three popular lactose-free milks, including well-known brands like Lactaid and Dairy Ease.