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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/449/386/product-dating-information-mk.pdf
1.01252
Starch
soluble GR for analysis ISO
Synonym(s):
Starch, Amylum, Potato starch for determination of diastase
About This Item
agency
reag. ISO
Quality Level
form
solid
pH
6.0-7.5 (25 °C, 20 g/L in H2O)
solubility
50 g/L
bulk density
300 kg/m3
storage temp.
no temp limit
SMILES string
O1[C@@H]([C@@H]([C@H]([C@@H]([C@H]1CO)O)O)O)O[C@@H]2[C@H](O[C@@H]([C@@H]([C@H]2O)O)O)CO
InChI
1S/C12H22O11/c13-1-3-5(15)6(16)9(19)12(22-3)23-10-4(2-14)21-11(20)8(18)7(10)17/h3-20H,1-2H2/t3-,4-,5-,6+,7-,8-,9-,10-,11+,12-/m1/s1
InChI key
GUBGYTABKSRVRQ-ASMJPISFSA-N
General description
Starch is generally composed of two molecule types: amylose and amylopectin. Starch and modified starches are important excipients. They act as fillers/binders.
Analysis Note
Appearance (description): fine powder
pH-value (2 %; water): 6.0 - 7.5
Sensitivity: passes test
Reducing matter (as maltose): max 0.7
Sulfated ash: max 0.4
Loss on drying (105 °C, 2 h): max 10
Suitability as enzyme substrate (for amylases): passes test
Iso reagent
Storage Class
11 - Combustible Solids
wgk_germany
WGK 1
flash_point_f
Not applicable
flash_point_c
Not applicable
Certificates of Analysis (COA)
Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.
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How can I determine the shelf life / expiration / retest date of this product?
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How is shipping temperature determined? And how is it related to the product storage temperature?
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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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What is the molecular weight and solubility of the product Starch 1.01252?
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The molecular weight of this product is not determined. It is described as a soluble starch, meaning that it is soluble in hot water. Note that the description of being a soluble starch is based on the method of preparation for the product; there is no specification for solubility:
https://www.sigmaaldrich.com/specification-sheet/SPEC/MDA/CHEM/1.01252/1012520100The recommendation is to follow the method of preparing a 2 percent solution as found in the book Reagent Chemicals, published by the American Chemical Society:
Prepare a paste of 2.0 g of the sample with a little cold water and add to it with stirring 100 mL of boiling water. The solution should be no more than opalescent, and on cooling it should remain liquid and not increase in opalescence.Helpful?
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