If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/418/501/product-dating-information-06-25-mk.pdf
85451
β-Sitosterol
≥70%
Synonym(e):
α-Dihydrofucosterol, 22,23-Dihydrostigmasterol, 24α-Ethylcholesterin, 5-Stigmasten-3β-ol
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InChI key
KZJWDPNRJALLNS-VJSFXXLFSA-N
InChI
1S/C29H50O/c1-7-21(19(2)3)9-8-20(4)25-12-13-26-24-11-10-22-18-23(30)14-16-28(22,5)27(24)15-17-29(25,26)6/h10,19-21,23-27,30H,7-9,11-18H2,1-6H3/t20-,21-,23+,24+,25-,26+,27+,28+,29-/m1/s1
SMILES string
O[C@H](C1)CC[C@@]2(C)C1=CC[C@]3([H])[C@]2([H])CC[C@@]4(C)[C@@]3([H])CC[C@]4([H])[C@H](C)CC[C@H](C(C)C)CC
biological source
plant
assay
≥70%
form
powder
impurities
campesterol and β-sitostanol, residual
mp
136-140 °C (lit.)
functional group
hydroxyl
Quality Level
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Verwandte Kategorien
1 of 4
Dieser Artikel | |||
|---|---|---|---|
| assay ≥70% | assay ≥95% | assay - | assay ≥75% (β-sitosterol, GC), ≥95% sterol basis |
| biological source plant | biological source synthetic | biological source - | biological source - |
| functional group hydroxyl | functional group hydroxyl | functional group - | functional group - |
| form powder | form powder | form - | form solid |
| mp 136-140 °C (lit.) | mp 136-140 °C (lit.) | mp 136-140 °C (lit.) | mp - |
| Quality Level 200 | Quality Level 100 | Quality Level - | Quality Level 100 |
Application
Biochem/physiol Actions
Lagerklasse
11 - Combustible Solids
wgk
WGK 3
flash_point_f
Not applicable
flash_point_c
Not applicable
ppe
Eyeshields, Gloves, type N95 (US)
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How can I determine the shelf life / expiration / retest date of this product?
1 answer-
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Hello, How is the purity listed on the certificate determined? Do you calculate the purity based on a high purity b-sitosterol? We determined the purity with our own method and the result is different from the certificate.
1 answer-
The purity value reported on the certificate of analysis (CofA) for each lot of this product is simply the area percent for the major peak on the GC (gas chromatography) trace; the retention time for the major peak lines up with the retention time for beta-sitosterol. The main impurities expected to be present in this product are campesterol and beta-sitostanol, but neither the mass percent nor the area percent values for the peaks corresponding to those compounds are reported on the CofA. Since these compounds could have different response factors on the GC, the area percent values may not match the mass percent.
If a high purity beta-sitosterol (quantitative) certified reference material is required, please consider Product 47133, which is provided as a solution in chloroform: https://www.sigmaaldrich.com/product/supelco/47133Helpful?
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How is shipping temperature determined? And how is it related to the product storage temperature?
1 answer-
Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf
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