Leukotriene D4 (LTD4) is an active metabolite of LTC4 (Item Nos. 20210 | 10007241) and a constituent of slow-reacting substance of anaphylaxis (SRS-A).1,2 It is formed via metabolism of LTC4 by γ-glutamyl transpeptidase. Like LTC4, LTD4 (0.01-0.1 pM) induces contractions in isolated guinea pig parenchymal strips and tracheal spirals.3 In vivo, LTD4 increases insufflation pressure, a marker of bronchoconstriction, in anesthetized guinea pigs by 100% when administered at a dose of 89 pmol per animal.4 It also increases vascular permeability in guinea pig skin when administered intradermally at a dose of 0.1 pmol per animal.

LTD4 MaxSpec(R) standard is a quantitative grade standard of LTD4 (Item No. 20310) that has been prepared specifically for mass spectrometry and related applications where quantitative reproducibility is required. The solution has been prepared gravimetrically and is supplied in a deactivated glass ampule sealed under argon. The concentration was verified by comparison to an independently prepared calibration standard. The verified concentration is provided on the certificate of analysis. This LTD4 MaxSpec(R) standard is guaranteed to meet identity, purity, stability, and concentration specifications and is provided with a batch-specific certificate of analysis. Ongoing stability testing is performed to ensure the concentration remains accurate throughout the shelf life of the product. Note: The amount of solution added to the vial is in excess of the listed amount. Therefore, it is necessary to accurately measure volumes for preparation of calibration standards. Follow recommended storage and handling conditions to maintain product quality.