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Merck
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A1112

Sigma-Aldrich

海藻酸 钠盐 来源于褐藻

low viscosity

别名:

海藻酸钠, 褐藻胶

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100 G
$126.00
250 G
$278.00
500 G
$316.00
1 KG
$574.00

$126.00

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100 G
$126.00
250 G
$278.00
500 G
$316.00
1 KG
$574.00

About This Item

CAS号:
9005-38-3
MDL號碼:
MFCD00081310
分類程式碼代碼:
12352201
NACRES:
NA.25

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生物源

algae (brown)

品質等級

200

形狀

powder

顏色

white to brown

黏度

4-12 cP, 1 % in H2O(25 °C)

溶解度

water: 10 mg/mL, cloudy to hazy, faintly yellow

儲存溫度

2-8°C

SMILES 字串

[Na+].[O-]C(=O)C1O[C@H]([C@H]([C@H]([C@@H]1O)O)O)O

InChI

1S/C6H10O7.Na/c7-1-2(8)4(5(10)11)13-6(12)3(1)9;/h1-4,6-9,12H,(H,10,11);/q;+1/p-1/t1-,2-,3-,4?,6+;/m0./s1

InChI 密鑰

MSXHSNHNTORCAW-MPGIDXPLSA-M

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應用

海藻酸的酸水解产物可用于制备a-1,4-~-聚古罗糖醛酸和B- 1,4-~-聚糖醛酸 [1]
藻酸盐是一种能够凝胶的胶质聚糖酸结构分子，用于制备胶质可生物降解结构，如凝胶、生物膜、微珠、纳米颗粒和微胶囊，适用于从凝胶分离技术到药物递送和细胞保存的各种应用。

其他說明

一种直链、亲水、胶体状聚糖醛酸，主要由古洛糖醛酸和甘露糖醛酸残基组成。
为了全面了解我们针对客户研究提供的各种多糖产品，建议您访问我们的碳水化合物分类页面。

儲存類別代碼

11 - Combustible Solids

水污染物質分類（WGK）

WGK 1

閃點（°F）

Not applicable

閃點（°C）

Not applicable

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分析证书(COA)

Lot/Batch Number
0000311178
0000380419
0000380418
0000372947
0000372948

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E E Farmer et al.
The Journal of biological chemistry, 266(5), 3140-3145 (1991-02-15)
The in vitro phosphorylation by [gamma-32P]ATP of a 34-kDa plasma membrane-associated protein (pp34) from tomato and potato is strongly enhanced in the presence of alpha-1,4-D-polygalacturonic acid (PGA) fragments (Farmer, E. E., Pearce, G., and Ryan, C. A. (1989) Proc. Natl.
Daeha Joung et al.
Advanced functional materials, 28(39) (2018-09-26)
A bioengineered spinal cord is fabricated via extrusion-based multi-material 3D bioprinting, in which clusters of induced pluripotent stem cell (iPSC)-derived spinal neuronal progenitor cells (sNPCs) and oligodendrocyte progenitor cells (OPCs) are placed in precise positions within 3D printed biocompatible scaffolds
Juan Du et al.
The Plant cell, 32(11), 3576-3597 (2020-09-05)
Pectins are abundant in the cell walls of dicotyledonous plants, but how they interact with other wall polymers and influence wall integrity and cell growth has remained mysterious. Here, we verified that QUASIMODO2 (QUA2) is a pectin methyltransferase and determined
Jordan Gulli et al.
Biotechnology progress, 36(1), e2925-e2925 (2019-10-07)
Encapsulated microbes have been used for decades to produce commodities ranging from methyl ketone to beer. Encapsulated cells undergo limited replication, which enables them to more efficiently convert substrate to product than planktonic cells and which contributes to their stress
Tim N Enke et al.
Current biology : CB, 29(9), 1528-1535 (2019-04-30)
Understanding the principles that govern the assembly of microbial communities across earth's biomes is a major challenge in modern microbial ecology. This pursuit is complicated by the difficulties of mapping functional roles and interactions onto communities with immense taxonomic diversity and
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Questions

1–10 of 11 Questions  

  1. What is the carboxylic acid content of this polymer ?

    1 answer

    1. The carboxylic acid content is not determined for this product.

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  2. How is shipping temperature determined? And how is it related to the product storage temperature?

    1 answer

    1. 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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  3. How can I determine the shelf life / expiration / retest date of this product?

    1 answer

    1. 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/449/386/product-dating-information-mk.pdf

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  4. What is the ratio of mannuronic acid to guluronic acid in product A1112, Alginic acid sodium salt?

    1 answer

    1. This product is not tested on a lot by lot basis for MG ratio. However, historical data indicates that this material is 60-70 % Mannuronic acid and 30-40 % Guluronic acid resulting in an M/G ratio of 1.56. The degree of polymerization is 400-600. Molecular weight: approx. 30 000 - 100 000.

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  5. WHAT IS THE PURITY OF THE PRODUCT NO. A1112? Can you provide the NMR spectra of this product?

    1 answer

    1. The purity of this product is not a determined. An NMR of the material has not been performed. Please navigate to the ‘DOCUMENTATION’ section of the Product Detail Page to access a sample or lot-specific Certificate of Analysis:
      https://www.sigmaaldrich.com/product/sigma/a1112#product-documentation

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  6. What is the endotoxin level of this product?

    1 answer

    1. This product is not currently tested for endotoxin. Please see the link below to review the specification sheet and the tests performed on this product: https://www.sigmaaldrich.com/specification-sheets/805/253/A1112-BULK________SIGMA____.pdf

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  7. What taxa of brown algae are used for this product?

    1 answer

    1. This product is extracted from a seaweed from Norway. Further taxonomic classification is not determined.

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  8. Does this product create a low or high stiffness gel?

    1 answer

    1. This product is not tested for gelation or gel strength. Alginate forms a gel in the presence of cations. Typically CaCl2 is used to initiate gel formation. Increasing the concentration of calcium will result in a more firm gel. Calcium chloride may be added at a range of 0.1M to 0.5M, with gel strength increasing with the CaCl2 concentration.

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  9. Which is the maximum solubility in water of the alginate?

    1 answer

    1. Per our specifications, we test solubility in water at 10 mg/ml. We do not test the maximum amount that can be dissolved. When used as a gelling agent for plant tissue culture, Alginic acid is prepared at 1.75 – 4.0 % (w/v) in a low calcium buffered medium. At these concentrations, following stirring, the alginate will completely dissolve yielding a clear solution. It can then be filter sterilized or autoclaved. Gelation occurs in the presence of cations - typically CaCl2.

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  10. What is the percentage of guluronic, mannuronic monomers?

    1 answer

    1. The percentage of guluronic and mannuronic monomers are not determined for this product.

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1–10 of 11 Questions  

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