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2D Structure
Also known as: 585-86-4, Importal, 4-o-beta-d-galactopyranosyl-d-glucitol, D-lactitol, Lactositol, Lactosit
Molecular Formula
C12H24O11
Molecular Weight
344.31  g/mol
InChI Key
VQHSOMBJVWLPSR-JVCRWLNRSA-N
FDA UNII
L2B0WJF7ZY

Lactitol is a metabolite found in the aging mouse brain.
Lactitol is an Osmotic Laxative. The mechanism of action of lactitol is as an Osmotic Activity. The physiologic effect of lactitol is by means of Stimulation Small Intestine Fluid/Electrolyte Secretion.
1 2D Structure

2D Structure

2 Identification
2.1 Computed Descriptors
2.1.1 IUPAC Name
(2S,3R,4R,5R)-4-[(2S,3R,4S,5R,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyhexane-1,2,3,5,6-pentol
2.1.2 InChI
InChI=1S/C12H24O11/c13-1-4(16)7(18)11(5(17)2-14)23-12-10(21)9(20)8(19)6(3-15)22-12/h4-21H,1-3H2/t4-,5+,6+,7+,8-,9-,10+,11+,12-/m0/s1
2.1.3 InChI Key
VQHSOMBJVWLPSR-JVCRWLNRSA-N
2.1.4 Canonical SMILES
C(C1C(C(C(C(O1)OC(C(CO)O)C(C(CO)O)O)O)O)O)O
2.1.5 Isomeric SMILES
C([C@@H]1[C@@H]([C@@H]([C@H]([C@@H](O1)O[C@H]([C@@H](CO)O)[C@@H]([C@H](CO)O)O)O)O)O)O
2.2 Other Identifiers
2.2.1 UNII
L2B0WJF7ZY
2.3 Synonyms
2.3.1 MeSH Synonyms

1. 4-o-beta-d-galactopyranosyl-d-glucitol

2. Emportal

3. Importal

4. Neda Lactiv Importal

5. Oponaf

2.3.2 Depositor-Supplied Synonyms

1. 585-86-4

2. Importal

3. 4-o-beta-d-galactopyranosyl-d-glucitol

4. D-lactitol

5. Lactositol

6. Lactosit

7. Miruhen

8. Lactitolum

9. Lactobiosit

10. Lacitol

11. Lactit

12. Milchen

13. Finlac Dc

14. Lactitol Acm 50

15. Lacty (saccharide)

16. Lactitol Anhydrous

17. L2b0wjf7zy

18. Nsc 231323

19. Nsc-231323

20. Ins No.966

21. Chebi:75323

22. Ins-966

23. Lactitol Hydrate

24. D-glucitol, 4-o-beta-d-galactopyranosyl-

25. E-966

26. Dsstox_cid_24247

27. Dsstox_rid_80133

28. Dsstox_gsid_44247

29. Emportal

30. Oponaf

31. Bli-400

32. (2s,3r,4r,5r)-4-(((2s,3r,4s,5r,6r)-3,4,5-trihydroxy-6-(hydroxymethyl)tetrahydro-2h-pyran-2-yl)oxy)hexane-1,2,3,5,6-pentaol

33. Cas-585-86-4

34. Nsc-759131

35. Lactitolum [inn-latin]

36. Unii-l2b0wjf7zy

37. Lactitol [inn:ban:nf]

38. Floralac

39. Portolac

40. Ccris 7077

41. Lactosit Miruhen

42. Nsc231323

43. Hsdb 7970

44. Ncgc00166295-01

45. Importal (tn)

46. Einecs 209-566-5

47. Pizensy (tn)

48. Lactitol (nf/inn)

49. Lactitol [inci]

50. Lactitol [inn]

51. Lactitol [mi]

52. Lactitol [usp-rs]

53. Lactitol [who-dd]

54. Schembl3849

55. Chembl1661

56. Lactitol, Analytical Standard

57. Lactitol [orange Book]

58. Dtxsid9044247

59. Hms3264e13

60. Pharmakon1600-01301027

61. Hy-n7104

62. Zinc5225520

63. Tox21_112397

64. Mfcd00079407

65. Nsc760415

66. S5368

67. 4-beta-d-galactopyranosyl-d-glucito1

68. Akos030228540

69. Tox21_112397_1

70. Ccg-213712

71. Db12942

72. Nsc-760415

73. Ncgc00263893-02

74. (2s,3r,4r,5r)-4-[(2s,3r,4s,5r,6r)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyhexane-1,2,3,5,6-pentol

75. 4-o-b-d-galactopyranosyl-d-glucitol, 9ci

76. Beta-d-galactopyranosyl-(1->4)-d-glucitol

77. Cs-0069039

78. A11574

79. D08266

80. Ab00698230_06

81. 4-o-.beta.-d-galactopyranosyl-d-glucitol

82. Q415020

83. W-109090

84. Brd-k40787673-001-02-1

85. 262a7827-24f7-47ee-b528-3af52ca860ce

86. Wurcs=2.0/2,2,1/[h2122h][a2112h-1b_1-5]/1-2/a4-b1

87. (2s,3r,4r,5r)-4-((2s,3r,4s,5r,6r)-3,4,5-trihydroxy-6-(hydroxymethyl)tetrahydro-2h-pyran-2-yloxy)hexane-1,2,3,5,6-pentaol

88. (2s,3r,4r,5r)-4-[(2s,3r,4s,5r,6r)-3,4,5-trihydroxy-6-methylol-tetrahydropyran-2-yl]oxyhexane-1,2,3,5,6-pentol

2.4 Create Date
2005-08-08
3 Chemical and Physical Properties
Molecular Weight 344.31 g/mol
Molecular Formula C12H24O11
XLogP3-5.2
Hydrogen Bond Donor Count9
Hydrogen Bond Acceptor Count11
Rotatable Bond Count8
Exact Mass344.13186158 g/mol
Monoisotopic Mass344.13186158 g/mol
Topological Polar Surface Area201 Ų
Heavy Atom Count23
Formal Charge0
Complexity343
Isotope Atom Count0
Defined Atom Stereocenter Count9
Undefined Atom Stereocenter Count0
Defined Bond Stereocenter Count0
Undefined Bond Stereocenter Count0
Covalently Bonded Unit Count1
4 Drug and Medication Information
4.1 Therapeutic Uses

Sugar Alcohols; Cathartics; Sweetening Agents

National Library of Medicine's Medical Subject Headings online file (MeSH, 2009)


Lactitol (beta-galactosido-sorbitol) has been recently compared with lactulose for the treatment of chronic hepatic encephalopathy in a few studies, each comprising a small number of patients. The results are controversial. We studied the efficiency and tolerance of both compounds by using a meta-analysis on the basis of published controlled trials. /This/ study only included controlled or randomized trials comprising cirrhotic patients with chronic hepatic encephalopathy. Analyzed parameters were the portosystemic encephalopathy index of Conn after treatment, the percentage of improved patients and the percentage of patients who had ill effects related to the treatment (flatulence, diarrhea). Bibliographical screening revealed five studies comparing the effects of lactitol and lactulose in chronic hepatic encephalopathy. Four crossover studies were done that included 48 patients and one parallel study that included 29 patients. The duration of the treatment ranged from 3 to 6 mo. All studies found a similar efficiency with both drugs. However, they exhibited some discrepancies in the relative frequency of adverse reactions (flatulence). Meta-analysis showed no statistical differences in the portosystemic encephalopathy index after lactitol or lactulose treatment. The percentage of improved patients after lactitol or lactulose was similar. In contrast, the analysis revealed a higher frequency (p less than 0.01) of flatulence in patients treated with lactulose compared with those treated with lactitol. In conclusion, this meta-analysis shows no statistical difference between therapeutic effects of lactitol and lactulose, but it does show a higher frequency of flatulence with lactulose. This suggests that lactitol should be preferred to lactulose for the treatment of chronic hepatic encephalopathy.

PMID:1531204 Blanc P et al; Hepatology 15 (2): 222-8 (1992)


Preliminary data suggest that lactitol (beta-galactoside-sorbitol), a new synthetic non-absorbable disaccharide, has beneficial effects on chronic portal systemic encephalopathy. To compare the efficacy of lactitol vs. lactulose in the treatment of acute portal systemic encephalopathy (PSE), 40 cirrhotic patients with an acute episode of PSE were randomly allocated to one of two groups: group A (20 patients) received lactulose (30 mL/6 hr) and group B (20 patients) lactitol (12 g/6 hr). These doses were adjusted daily to obtain two bowel movements per day. The duration of treatment was 5 days. Age, sex, hepatic and renal function, precipitating factors and level of PSE measured by clinical examination, EEG and number connection test were similar in the two groups. A complete clinical resolution of PSE occurred in 11 patients in each group. In 5 patients of the lactulose group and in 6 of the lactitol group there was a moderate improvement of PSE during the study. Finally, 4 patients in the lactulose group and 3 in the lactitol group did not respond to treatment. No side effects attributable to therapy were observed in either group. These results indicate that lactitol is as effective as lactulose in the management of patients with cirrhosis and acute PSE.

PMID:3598162 Heredia D et al; J Hepatol 4 (3): 293-8 (1987)


4.2 Drug Indication

Lactitol is indicated for the treatment of chronic idiopathic constipation in adults.


FDA Label


5 Pharmacology and Biochemistry
5.1 Pharmacology

Lactitol helps to facilitate bowel movements by drawing water into the gastrointestinal tract. The oral administration of lactitol may reduce the absorption of concomitant medications - other oral medications should be administered at least 2 hours before or 2 hours after lactitol.


5.2 MeSH Pharmacological Classification

Cathartics

Agents that are used to stimulate evacuation of the bowels. (See all compounds classified as Cathartics.)


Sweetening Agents

Substances that sweeten food, beverages, medications, etc., such as sugar, saccharine or other low-calorie synthetic products. (From Random House Unabridged Dictionary, 2d ed) (See all compounds classified as Sweetening Agents.)


5.3 FDA Pharmacological Classification
5.3.1 Active Moiety
LACTITOL
5.3.2 FDA UNII
L2B0WJF7ZY
5.3.3 Pharmacological Classes
Physiologic Effects [PE] - Stimulation Small Intestine Fluid/Electrolyte Secretion
5.4 ATC Code

A06AD12

S76 | LUXPHARMA | Pharmaceuticals Marketed in Luxembourg | Pharmaceuticals marketed in Luxembourg, as published by d'Gesondheetskeess (CNS, la caisse nationale de sante, www.cns.lu), mapped by name to structures using CompTox by R. Singh et al. (in prep.). List downloaded from https://cns.public.lu/en/legislations/textes-coordonnes/liste-med-comm.html. Dataset DOI:10.5281/zenodo.4587355


A - Alimentary tract and metabolism

A06 - Drugs for constipation

A06A - Drugs for constipation

A06AD - Osmotically acting laxatives

A06AD12 - Lactitol


5.5 Absorption, Distribution and Excretion

Absorption

In healthy subjects under fed conditions, oral administration of 20 grams of lactitol resulted in a mean Tmax of 3.6 1.2 hours, Cmax of 776 253 ng/mL, and a mean AUC of 6,019 1,771 ng*hr/mL.


Route of Elimination

Lactitol is not absorbed in the gastrointestinal tract to any significant extent. The vast majority of an ingested dose is likely degraded into organic acids in the colon and eliminated in the feces.


Volume of Distribution

Data regarding the volume of distribution of lactitol are unavailable.


Clearance

Data regarding the clearance of lactitol are unavailable.


Three male rats (150-200 g; six to eight weeks of age; one not pretreated and two habituated to a diet containing 7% lactitol) were orally intubated with about 2 mg D-(sorbitol-1-(14)C) lactitol. In the studies with the rats habituated to lactitol, 9-15% of the radioactivity was recovered from the air exhaled in the period 0-5 hours and 48% from the air exhaled in the period 0-24 hours. The urine and the feces contained a minor proportion of the administered radioactivity (urine, 2.3% after five hours and 6.8% after 24 hours; feces, 11.7% after 24 hours). The gastrointestinal tract contained 33% of the radioactivity after five hours and 5% after 24 hours; the remainder of the body contained 20% after five hours and 9% after 24 hours. It was concluded that lactitol is extensively degraded in the rat after oral administration presumably mainly by the intestinal microflora and that habituation of the rats to unlabelled lactitol did not essentially affect the rate and extent of degradation.

WHO/FAO: Expert Committee on Food Additives. Summary of Toxicological Data of Certain Food Additives Series 18: Lactitol (585-86-4) (1983). Available from, as of July 19, 2011: https://www.inchem.org/pages/jecfa.html


In studies designed to investigate the metabolism of erythritol in vivo in healthy volunteers and to compare the fermentation of erythritol by human fecal flora in vitro with that of glucose and lactitol, four male and two female volunteers aged 21-25 undertook an overnight fast and were then chosen at random to receive a single dose of 25 g (13)C-erythritol, (13)C-glucose, and (13)C-lactitol in 250 mL of water with at least three days between each treatment. Breath samples were taken for analysis of (13)C-carbon dioxide and hydrogen gas before treatment and at 30 min intervals up to 6 hr after treatment. The ratio of (13)C: (12)C-carbon dioxide was measured by isotope-ratio mass spectrometry. Urine samples were collected over 0-6 and 6-24 hr after treatment, and the erythritol and lactitol concentrations in urine were measured by HPLC. ... During the first 6 and 24 hr after dosing, 52 and 84%, respectively, of the administered erythritol was recovered in the urine. No increase in expired (13)C-carbon dioxide or hydrogen gas was observed, indicating that no fermentation had occurred in the gut. In contrast, there was a rapid increase in expired (13)C-carbon dioxide after consumption of glucose and a more gradual rise after ingestion of lactitol. Excretion of hydrogen gas in expired air was also increased after treatment with lactitol. Neither lactitol nor glucose was detected in significant amounts in the urine. ...

WHO/FAO: Expert Committee on Food Additives. Summary of Toxicological Data of Certain Food Additives Series 44: Erythritol (149-32-6) (2000). Available from, as of July 12, 2011: https://www.inchem.org/pages/jecfa.html


The gastrointestinal absorption of lactitol has been studied in 6 healthy volunteers and 8 patients with cirrhosis. Following administration of lactitol 0.5 g/kg, no lactitol was found in serum. The urinary excretion of lactitol over 24 hr ranged from 0.1 to 1.4% of the administered dose (0.46% in cirrhotics and 0.35% in healthy volunteers). Blood D- and L-lactate and plasma glucose did not increase following lactitol. The data indicate that lactitol was poorly absorbed from the gastrointestinal tract in healthy volunteers and patients with cirrhosis, and that the disaccharide did not disturb glucose or lactate homeostasis.

PMID:3220101 Metzger J et al; Eur J Clin Pharmacol 35 (1): 97-9 (1988)


The fate of orally ingested lactitol, a non-absorbed sugar, was measured in six healthy human subjects by following the three routes of disposal of universally (14)C-labelled sugar. Lactitol was given as a 20 g daily dose to six healthy volunteers for 14 days and on the seventh day, 10 muCi of L-[U-(14)C]-lactitol was given with the unlabelled sugar and excretion of the (14)C in breath, urine and faeces was followed. The peak of (14)CO2 excretion occurred at six hours and total (14)CO2 accounted for 62.9 (5.0)% of isotope given, whilst 6.5 (3.6)% and 2.0 (0.3)% of the label were recovered from faeces and urine respectively. These data suggest that lactitol is extensively metabolised in the human colon and that a significant proportion of the bacterial metabolites are available for colonic absorption. Calculation revealed that 54.5% of the theoretical energy content of this compound was utilised by the subjects. ...

PMID:3220306 Full text: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1434111 Grimble GK et al; Gut 29 (12): 1666-71 (1988)


5.6 Metabolism/Metabolites

As it undergoes little-to-no systemic absorption, lactitol is unlikely to undergo any significant degree of metabolism.


In studies designed to investigate the metabolism of erythritol in vivo in healthy volunteers and to compare the fermentation of erythritol by human fecal flora in vitro with that of glucose and lactitol, four male and two female volunteers aged 21-25 undertook an overnight fast and were then chosen at random to receive a single dose of 25 g (13)C-erythritol, (13)C-glucose, and (13)C-lactitol in 250 mL of water with at least three days between each treatment. Breath samples were taken for analysis of (13)C-carbon dioxide and hydrogen gas before treatment and at 30 min intervals up to 6 hrs after treatment. The ratio of (13)C: (12)C-carbon dioxide was measured by isotope-ratio mass spectrometry. ... In order to maintain a constant metabolic rate, the subjects remained at rest during the study. For the assay of fermentation in vitro, fecal samples were collected from six healthy volunteers (sex and age not specified) who ate a normal western diet. None of the subjects complained of gastrointestinal symptomsand none had used antibiotics in the past six months. The samples were incubated under anaerobic conditions for 6 hr, and then the hydrogen gas concentration was measured in the head-space of the incubation vials. ... After a 6 hr incubation with erythritol, the amount of hydrogen gas formed by the fecal flora was comparable to that in control vials, but significantly (p < 0.001) more hydrogen gas was produced in the glucose and lactitol vials than in either control or erythritol.

WHO/FAO: Expert Committee on Food Additives. Summary of Toxicological Data of Certain Food Additives Series 44: Erythritol (149-32-6) (2000). Available from, as of July 12, 2011: https://www.inchem.org/pages/jecfa.html


5.7 Biological Half-Life

The average half-life of orally administered lactitol is 2.4 hours.


5.8 Mechanism of Action

Lactitol is an osmotic laxative - it exerts its pharmacologic effect by creating a hyperosmotic environment within the small intestine. The osmotic effect generated by lactitol draws water into the small intestine, which loosens stools and ultimately facilitates bowel movements.


Lactitol, an unabsorbed sugar with defined laxative threshold and superior taste properties has been suggested as an alternative to lactulose in the treatment of hepatic encephalopathy. In the present study /investigators/ compared the colonic metabolism of the two sugars using an in vitro fecal incubation system. Both sugars were readily metabolized by fecal bacteria producing volatile fatty acids and the metabolism was inhibited by neomycin. The effect of lactitol and lactulose on terminal ileal and colonic pH was monitored in six normal subjects using a radiotelemetry technique. Both sugars significantly lowered right colonic pH (basal -6.51 +/- 0.48 vs lactitol -5.63 +/- 0.50; lactulose -5.18 +/- 0.82, p less than 0.05). The pH of rest of the colon and terminal ileum was unaffected. Neomycin given concurrently with lactulose abolished acidification of right colon. As lactitol and lactulose have similar effects within the colon, lactitol would appear to have a role in the treatment of hepatic encephalopathy. As neomycin antagonizes the effect of lactulose in the colon, its concurrent use may be less effective in the treatment of hepatic encephalopathy.

PMID:3570029 Full text: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1432706 Patil DH et al; Gut 28 (3): 255-9 (1987)


... Reports from authoritative bodies and reviews indicates that the decrease in pH in plaque as a consequence of metabolic acid production by saccharolytic bacteria when exposed to fermentable carbohydrates (i.e. sugars and starches) may promote demineralization and prevent remineralization of the hydroxyapatite crystals. Tooth hydroxyapatite crystals are very resistant to dissolution at neutral pH, but their solubility drastically increases as pH drops. Typically, the critical pH for dental enamel is around 5.5. ... Demineralization of tooth tissues can also occur as a result of consumption of dietary acids in foods or beverages, and that frequent consumption can lead to dental erosion. Xylitol, sorbitol, mannitol, maltitol, lactitol, isomalt, erythritol, D-tagatose, isomaltulose, sucralose and polydextrose are slowly metabolized by bacteria in the mouth. The rate and amount of acid production from these food constituents is significantly less than that from sucrose. ... Xylitol, sorbitol, mannitol, maltitol, lactitol, isomalt, erythritol, D-tagatose, isomaltulose, sucralose and polydextrose do not promote dental caries because they do not lower plaque pH to the level associated with enamel demineralization. ... A cause and effect relationship has been established between the consumption of sugar-containing foods/drinks at an exposure frequency of four times daily or more and an increased tooth demineralization, and that the consumption of foods/drinks containing xylitol, sorbitol, mannitol, maltitol, lactitol, isomalt, erythritol, D-tagatose, isomaltulose, sucralose or polydextrose, instead of sugar in sugar-containing foods/drinks, may maintain tooth mineralization by decreasing tooth demineralization compared with sugar-containing foods, provided that such foods/drinks do not lead to dental erosion.

European Food Safety Authority (EFSA); EFSA Panel on Dietetic Products, Nutrition and Allergies (NDA): Scientific Opinion on the substantiation of health claims related to the sugar replacers xylitol, sorbitol, mannitol, maltitol, lactitol, isomalt, erythritol, D-tagatose, isomaltulose, sucralose and polydextrose and maintenance of tooth mineralisation by decreasing tooth demineralisation and reduction of post-prandial glycaemic responses (April 2011). Available from, as of July 28, 2011: https://www.efsa.europa.eu/en/publications.htm


The food constituents xylitol, sorbitol, mannitol, maltitol, lactitol, isomalt, erythritol, D-tagatose, isomaltulose, sucralose or polydextrose resulted in reduced post-prandial blood glucose (or insulinemic) responses compared with sugars on a weight by weight basis owing to their reduced/delayed digestion/absorption and/or to a decrease in the amount of available carbohydrates, and that the consumption of foods/drinks in which xylitol, sorbitol, mannitol, maltitol, lactitol, isomalt, erythritol, D-tagatose, isomaltulose, sucralose or polydextrose replaced sugars induced lower post-prandial glycemic and insulinemic responses than sugar-containing foods/drinks. ... A cause and effect relationship has been established between the consumption of foods/drinks containing xylitol, sorbitol, mannitol, maltitol, lactitol, isomalt, erythritol, D-tagatose, isomaltulose, sucralose or polydextrose instead of sugar and reduction in post-prandial blood glucose responses (without disproportionally increasing post-prandial insulinemic responses) as compared to sugar-containing foods/drinks.

European Food Safety Authority (EFSA); EFSA Panel on Dietetic Products, Nutrition and Allergies (NDA): Scientific Opinion on the substantiation of health claims related to the sugar replacers xylitol, sorbitol, mannitol, maltitol, lactitol, isomalt, erythritol, D-tagatose, isomaltulose, sucralose and polydextrose and maintenance of tooth mineralisation by decreasing tooth demineralisation and reduction of post-prandial glycaemic responses (April 2011). Available from, as of July 28, 2011: https://www.efsa.europa.eu/en/publications.htm