We are open as normal during COVID-19 pandemic. Order online, same day shipping out.

    WARNING: This product is for research use only, not for human or veterinary use.

MedKoo CAT#: 319763

CAS#: 14087-31-1

Description: Gaxilose, also known as 4-Galactosylxylose, a synthetic disaccharide and a substrate of intestinal lactase. Gaxilose is used in a new noninvasive diagnostic test based on urine or serum measurement of D-xylose after lactase cleavage of orally administered 4-galactosylxylose (gaxilose). Gaxilose is hydrolyzed into galactose and xylose in vivo. Galactose is converted into glucose in the liver and xylose is absorbed from a passive way and partially metabolized endogenously (50%). The rest appears in blood and it is excreted finally through urine. The amount of xylose in urine is proportional to the activity of intestinal lactase. This represents a direct measure of hypo or normo lactasia.

Price and Availability

Size Price Shipping out time Quantity
Inquire bulk and customized quantity

Pricing updated 2020-04-01. Prices are subject to change without notice.

Gaxilose is not in stock, but may be available through custom synthesis. For cost-effective reason, minimum 1 gram order is requested. The product will be characterized by NMR, HPLC and MS analysis. Purity (HPLC) is usually >98%. CoA, QC data, MSDS will be provided when product is successfully made. The estimated lead time is 2-3 months. Please send email to to inquire quote.

Chemical Structure


Theoretical Analysis

MedKoo Cat#: 319763
Name: Gaxilose
CAS#: 14087-31-1
Chemical Formula: C11H20O10
Exact Mass: 312.1056
Molecular Weight: 312.271
Elemental Analysis: C, 42.31; H, 6.46; O, 51.23

Synonym: 4-O-Galactosyl-D-xylose; 4-O-Galactosylxylose; 4-Galactosylxylose; Gaxilose

IUPAC/Chemical Name: (3R,4R,5R)-5-(((2S,3R,4S,5R,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)tetrahydro-2H-pyran-2,3,4-triol


InChi Code: InChI=1S/C11H20O10/c12-1-3-5(13)7(15)9(17)11(20-3)21-4-2-19-10(18)8(16)6(4)14/h3-18H,1-2H2/t3-,4-,5+,6+,7+,8-,9-,10?,11+/m1/s1

SMILES Code: OC1[C@@H]([C@H]([C@@H](CO1)O[C@H]2[C@@H]([C@H]([C@H]([C@@H](CO)O2)O)O)O)O)O

Technical Data

Solid powder

>98% (or refer to the Certificate of Analysis)

Shipping Condition:
Shipped under ambient temperature as non-hazardous chemical. This product is stable enough for a few weeks during ordinary shipping and time spent in Customs.

Storage Condition:
Dry, dark and at 0 - 4 C for short term (days to weeks) or -20 C for long term (months to years).

Soluble in DMSO, not in water

Shelf Life:
>2 years if stored properly

Drug Formulation:
This drug may be formulated in DMSO

Stock Solution Storage:
0 - 4 C for short term (days to weeks), or -20 C for long term (months).

HS Tariff Code:


1: Domínguez Jiménez JL, Fernández Suárez A, Muñoz Colmenero AÚ, Fatela Cantillo D, López Pelayo I. Primary hypolactasia diagnosis: Comparison between the gaxilose test, shortened lactose tolerance test, and clinical parameters corresponding to the C/T-13910 polymorphism. Clin Nutr. 2016 Jan 20. pii: S0261-5614(16)00008-X. doi: 10.1016/j.clnu.2016.01.006. [Epub ahead of print] PubMed PMID: 26847948.

2: Hermida C, Martínez-Costa OH, Corrales G, Teruel C, Sánchez V, Sánchez JJ, Sarrión D, Ariza MJ, Codoceo R, Calvo I, Fernández-Mayoralas A, Aragón JJ. Improvement and validation of d-xylose determination in urine and serum as a new tool for the noninvasive evaluation of lactase activity in humans. J Clin Lab Anal. 2014 Nov;28(6):478-86. doi: 10.1002/jcla.21713. Epub 2014 Mar 22. PubMed PMID: 24659338.

3: Aragón JJ, Hermida C, Martínez-Costa OH, Sánchez V, Martín I, Sánchez JJ, Codoceo R, Cano JM, Cano A, Crespo L, Torres Y, García FJ, Fernández-Mayoralas A, Solera J, Martínez P. Noninvasive diagnosis of hypolactasia with 4-Galactosylxylose (Gaxilose): a multicentre, open-label, phase IIB-III nonrandomized trial. J Clin Gastroenterol. 2014 Jan;48(1):29-36. doi: 10.1097/MCG.0b013e318297fb10. PubMed PMID: 23722657.

4: Hermida C, Guerra P, Martínez-Costa OH, Sánchez V, Sánchez JJ, Solera J, Fernández-Mayoralas A, Codoceo R, Frías J, Aragón JJ. Phase I and phase IB clinical trials for the noninvasive evaluation of intestinal lactase with 4-galactosylxylose (gaxilose). J Clin Gastroenterol. 2013 Jul;47(6):501-8. doi: 10.1097/MCG.0b013e318272f507. PubMed PMID: 23328304.

5: Hermida C, Corrales G, Martínez-Costa OH, Fernández-Mayoralas A, Aragón JJ. Noninvasive evaluation of intestinal lactase with 4-galactosylxylose: comparison with 3- and 2-galactosylxylose and optimization of the method in rats. Clin Chem. 2006 Feb;52(2):270-7. Epub 2005 Dec 29. PubMed PMID: 16384892.

6: Aragón JJ, Fernández-Mayoralas A, Jiménez-Barbero J, Martín-Lomas M, Rivera-Sagredo A, Villanueva D. Evaluation of rat intestinal lactase in vivo with 4-galactosylxylose. Clin Chim Acta. 1992 Sep 30;210(3):221-6. PubMed PMID: 1468143.

7: Rivera-Sagredo A, Fernández-Mayoralas A, Jiménez-Barbero J, Martín-Lomas M, Villanueva D, Aragón JJ. 4-O-beta-D-galactopyranosyl-D-xylose: a new synthesis and application to the evaluation of intestinal lactase. Carbohydr Res. 1992 Apr 10;228(1):129-35. PubMed PMID: 1516083.

8: Rio S, Beau JM, Jacquinet JC. Synthesis of glycopeptides from the carbohydrate-protein linkage region of proteoglycans. Carbohydr Res. 1991 Oct 14;219:71-90. PubMed PMID: 1804538.