Providing storage is as stated on the product vial and the vial is kept tightly sealed, the product can be stored for up to
24 months(2-8C).
Wherever possible, you should prepare and use solutions on the same day. However, if you need to make up stock solutions in advance, we recommend that you store the solution as aliquots in tightly sealed vials at -20C. Generally, these will be useable for up to two weeks. Before use, and prior to opening the vial we recommend that you allow your product to equilibrate to room temperature for at least 1 hour.
Need more advice on solubility, usage and handling? Please email to: service@chemfaces.com
The packaging of the product may have turned upside down during transportation, resulting in the natural compounds adhering to the neck or cap of the vial. take the vial out of its packaging and gently shake to let the compounds fall to the bottom of the vial. for liquid products, centrifuge at 200-500 RPM to gather the liquid at the bottom of the vial. try to avoid loss or contamination during handling.
Chemical & Pharmaceutical Bulletin , 2008 , 25 (11) :2895-2899.
Application of ^<13>C Nuclear Magnetic Resonance Spectroscopy to Chemistry of Glycosides : Structures of Paniculosides-I, -II, -III, -IV, and -V, Diterpene Glucosides of Stevia paniculata LAG[Reference:
WebLink]
From the aerial part of Stevia paniculata (Compositae), five new diterpene glucosides, named Paniculoside I, Paniculoside II, Paniculoside III, Paniculoside IV, and Paniculoside V(5-9) were isolated.
METHODS AND RESULTS:
On comparison of ^<13>C nuclear magnetic resonance spectra of these glucosides with those of the aglycones, ent-15α-hydroxykaur-16-en-19-oic acid (1) [as methyl ester (17)], ent-11α-hydroxy-15-oxokaur-16-en-19-oic acid (2), ent-11α, 15α-dihydroxykaur-16-en-19-oic acid (3), and ent-16β, 17-dihydroxykauran-19-oic acid (4) as well as some model glucosides, paniculosides I-IV (5-8) can be formulated as β-glucopyranosyl ester of 1,3,2,and 4,respectively and paniculoside-V (9) can be represented by 15-O-β-glucopyranoside of 5.
