R6281   Alul 正品现货   品牌 Promega

Alul 正品现货

货号: R6281      产品名称: Alul 正品现货   品牌: Promega 规格: 500u 现货

说明:
Features – Benefits•Rapid Digest Capable: Capable of digesting DNA in 15 minutes or less.
SourceArthrobacter luteus.
Storage Buffer10mM Tris-HCl (pH 7.4), 100mM sodium citrate, 0.1mM EDTA, 1mM DTT, 0.5mg/ml BSA, 50% glycerol.

Store at –20°C.
本产品仅用于生命科学研究。

–20°C.

C2538   正品热销|Carboplatin|卡铂   品牌 Sigma

正品热销|Carboplatin|卡铂

货号: C2538      产品名称: 正品热销|Carboplatin|卡铂   品牌: Sigma 规格: 50mg 大量现货 抗肿瘤

产品名称:卡铂
英文名称:
Carboplatin
分子式: C6H12N2O4Pt
CAS No.:41575-94-4
用途:抗肿瘤
性状:白色结晶粉末
Sigma相关产品资料:
Sigma C2538 
Carboplatin
Synonym: cis-Diammine(1,1-cyclobutanedicarboxylato) platinum
CAS Number: 41575-94-4
Linear Formula: [C4H6(CO2)2]Pt(NH3)2
Molecular Weight: 371.25
EC Number: 255-446-0
MDL number: MFCD00070464
PubChem Substance ID: 24278303
Description
Biochem/physiol Actions Carboplatin is a platinum-based antineoplastic drug that damages DNA by forming intrastrand cross-links with neighboring guanine residues. Tumors acquire resistance to these drugs through the loss of DNA-mismatch repair (MMR) activity and the resultant decrease in the induction of programmed cell death.
安全性
Personal Protective Equipment Eyeshields, Faceshields, full-face particle respirator type N100 (US), Gloves, respirator cartridge type N100 (US), type P1 (EN143) respirator filter, type P3 (EN 143) respirator cartridges
Hazard Codes T
Risk Statements 46-61-20/21/22-42/43
Safety Statements 53-22-26-36/37/39-45
WGK Germany 3
RTECS TP2300000

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D9515   进口正品|Driselase|崩溃酶|担子菌   品牌 Sigma

进口正品|Driselase|崩溃酶|担子菌

货号: D9515      产品名称: 进口正品|Driselase|崩溃酶|担子菌   品牌: Sigma 规格: 1G 现货 可以水解细胞壁

Driselase|崩溃酶|sigma D9515|担子菌|大量现货供应
简介说明:
崩溃酶:是一种复合酶,内含. 昆布多糖酶(laminarinase)、木聚糖酶(xylanase)和纤维素酶(cellulase),消解细胞壁的能力强.
崩溃酶:一种粗制酶,主要含纤维素酶和果胶酶,还混有蛋白酶和核酸酶.加速培养细胞核根尖细胞离解
崩溃酶(drislease)是可以水解细胞壁(主要是真菌细胞壁)的多种酶的混合物,制备原生质体很有用.
Other Notes Crude powder containing laminarinase, xylanase and cellulase.
Legal Information Driselase is a registered trademark of Kyowa Hakko Kogyo Co.
性质:
SigmaD9515 Driselase® from Basidiomycetes sp.
powder, Protein ≥10 % by biuret
CAS Number: 85186-71-6
EC Number: 286-055-3
MDL number: MFCD00130978
Ltd.
form powder
composition Protein, ≥10% biuret 
storage temp. −20°C
安全性:
Personal Protective Equipment Eyeshields, Gloves, type N95 (US), type P1 (EN143) respirator filter
WGK Germany 3

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品名 产地 货号 规格 价格 崩溃酶Driselase Sigma D9515 100MG 230 崩溃酶Driselase Sigma D9515 500MG 500 崩溃酶Driselase Sigma D9515 1G 950

-20℃

79654   正品|QIAshredder (50)   品牌 Qiagen

正品|QIAshredder (50)

货号: 79654      产品名称: 正品|QIAshredder (50)   品牌: Qiagen 规格: 50T 现货 核酸纯化

QIAshredder
简单快速均质化细胞和组织的裂解液
代替针筒抽吸的均质化步骤
可以减少样品的消耗
防止样品间的交叉污染
可以去除不溶性沉淀碎片和降低粘稠度
Principle
The QIAshredder homogenizer consists of a unique biopolymer-shredding system in a microcentrifuge spin-column format. Isolation of total or poly A+ RNA from cell or tissue lysates requires homogenization to reduce viscosity caused by high-molecular-weight cellular components and cell debris. Traditional methods use syringes and needles, which are tedious, inconvenient, and hazardous to handle. QIAshredder homogenizers replace these homogenization methods with a fast and simple centrifugation step. In general, similar yields and RNA quality are obtained for cell lysates as with rotor–stator homogenization (see figure "Comparison of RNA yields with different homogenization methods").
Procedure
Up to 700 µl of cell or tissue lysate can be homogenized by pipetting or decanting the lysate into a QIAshredder homogenizer and centrifuging for 2 minutes at full speed in a microcentrifuge. The homogenized lysate is ready to use in nucleic acid isolation procedures.

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I5500   正品|Insulin|牛胰岛素|   品牌 Sigma

正品|Insulin|牛胰岛素|

货号: I5500      产品名称: 正品|Insulin|牛胰岛素|   品牌: Sigma 规格: 50mg 大量现货

牛胰岛素是牛胰脏中胰岛β-细胞所分泌的一种调节糖代谢的蛋白质激素,是一种多肽.
Sigma相关产品资料
Sigma-Aldrich    I5500  
Insulin from bovine pancreas
≥27 USP units/mg (HPLC), powder
CAS Number: 11070-73-8
Linear Formula: C254H377N65O75S6
Molecular Weight: 5733.49
EC Number: 234-291-2
MDL number: MFCD00131380
Description
Frequently Asked Questions Live Chat and Frequently Asked Questions  are available for this Product.
Biochem/physiol Actions Two-chain polypeptide hormone produced by the β-cells of pancreatic islets. Its molecular weight is ~5800 Da. The α and β chains are joined by two interchain disulfide bonds. The α chain contains an intrachain disulfide bond. Insulin regulates the cellular uptake, utilization, and storage of glucose, amino acids, and fatty acids and inhibits the breakdown of glycogen, protein, and fat.
性质
form powder
cation traces Zn: ~0.5%
storage temp. −20°C

−20°C

C0875   供正品|Fluorexon|calcein|钙黄绿素|   品牌 Sigma

供正品|Fluorexon|calcein|钙黄绿素|

货号: C0875      产品名称: 供正品|Fluorexon|calcein|钙黄绿素|   品牌: Sigma 规格: 10G 大量现货

英文名:Fluorexon, calcein
别名:Fluorescein di-(methylimino diacetic acid); Bis[N,N-bis(carboxymethyl)aminomethyl]fluorescein; Calcein; Fluorescein Complexon
性质:橙色结晶性粉末,有金属光泽。溶于水,呈黄色,有绿色荧光;其酸性溶液不具荧光,碱性溶液为橙红色,亦不具荧光。不溶于无水乙醇及乙醚。是络合滴定法测钙用的金属指示剂。
Sigma相关产品资料:
Sigma   C0875   Calcein
Used for the fluorometric determination of calcium and EDTA titration of calcium in the presence of magnesium.
Synonym: Fluorescein-bis(methyliminodiacetic acid), Fluorexon, Bis[N,N−bis(carboxymethyl)aminomethyl]fluorescein
CAS Number: 1461-15-0
Linear Formula: C30H26N2O13
Molecular Weight: 622.53
Beilstein Registry Number: 8181068
EC Number: 215-957-1
MDL number: MFCD00005049
PubChem Substance ID: 24892279
Description
Frequently Asked Questions Live Chat and Frequently Asked Questions  are available for this Product.

常温

I0125 正品   正品进口|Glyoxaline|Imidazole|咪唑   品牌 Sigma

正品进口|Glyoxaline|Imidazole|咪唑

货号: I0125 正品      产品名称: 正品进口|Glyoxaline|Imidazole|咪唑   品牌: Sigma 规格: 100G 大量现货 用作环氧树脂固化剂

中文名称: 咪唑,甘恶啉;1,3-二氮杂茂;1,3-二氮杂-2,4-环戊二烯
英文名称:Imidazole
性质:
白色棱形或片状结晶,易溶于水,乙醇,乙醚,氯仿中,微溶于苯,难溶于石油醚,有毒,对皮肤,粘膜有刺激性和腐蚀性.
溶解情况: 咪唑微溶于苯、石油醚,溶于乙醚、丙酮、氯仿、吡啶,易溶于水、乙醇。
用途:用作环氧树脂固化剂,作为铜的防锈剂,医药、农药原料,也用作脲醛树脂固化剂、摄影药物、粘合剂、涂料、橡胶硫化剂、防静电剂等的原料及有机合成中间体。
Simga相关产品资料
Sigma  I0125 Imidazole
reagent grade, ≥98.5% (titration), crystalline
Synonym: 1,3-Diaza-2,4-cyclopentadiene, Glyoxaline
CAS Number: 288-32-4
Linear Formula: C3H4N2
Molecular Weight: 68.08
Beilstein Registry Number: 103853
EC Number: 206-019-2
MDL number: MFCD00005183
PubChem Substance ID: 24895896
Description
Application Excellent for buffers in the range of pH 6.2-7.8
Properties
grade reagent grade
vapor pressure <1 mmHg ( 20 °C)
assay ≥98.5% (titration)
form crystalline
total impurities ~0.3% Fluorescence blank(β-NADH equivalence.)
color white to off-white
pKa (25 °C) 6.95
bp 256 °C(lit.)
mp 88-91 °C(lit.)

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D8130   正品|DTNB|5,5’-二硫代双(2-硝基苯甲酸)   品牌 Sigma

正品|DTNB|5,5’-二硫代双(2-硝基苯甲酸)

货号: D8130      产品名称: 正品|DTNB|5,5’-二硫代双(2-硝基苯甲酸)   品牌: Sigma 规格: 5G 大量现货

5,5′-Dithiobis(2-nitrobenzoic acid)
≥98% (TLC), BioReagent, suitable for determination of sulfhydryl groups DOWNLOAD MSDS (PDF)
Synonym: 3-Carboxy-4-nitrophenyl disulfide 6,6′-Dinitro-3,3′-dithiodibenzoic acid Bis(3-carboxy-4-nitrophenyl) disulfide DTNB Ellman’s Reagent
CAS Number 69-78-3
Linear Formula [-SC6H3(NO2)CO2H]2
Molecular Weight 396.35
Product Name 5,5′-Dithiobis(2-nitrobenzoic acid),
≥98% (TLC), BioReagent, suitable for determination of sulfhydryl groups
Product Number D8130
Product Brand SIGMA
CAS Number 69-78-3
Molecular Weight 396.35
TEST SPECIFICATION
Appearance (Color) Yellow
Appearance (Form) Powder
Infrared spectrum Conforms to Structure
Purity (TLC) ≥98 %
Solubility (Turbidity) Clear
Solubility (Color) Yellow to Yellow-Green
  Solubility Concentration: 10 mg in 1 mL of Ethanol
Suitability Suitable
  Suitable for Use as a Reagent in Sulfhydryl Group
  Determination
Recommended Retest Period ————————-
  5 Years

 

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P4265   正品|Pepstatin A|Pepstatin|胃蛋白酶抑制剂|抑肽素   品牌 Sigma

正品|Pepstatin A|Pepstatin|胃蛋白酶抑制剂|抑肽素

货号: P4265      产品名称: 正品|Pepstatin A|Pepstatin|胃蛋白酶抑制剂|抑肽素   品牌: Sigma 规格: 5mg 大量现货

中文名:抑肽素,胃蛋白酶抑制剂
英文名:Pepstatin,Pepstatin A
PN-Isovaleryl-L-valyl-L-valyl-3-hydroxy-6-methyl-gamma-aminoheptanoyl-L-alanyl-3-hydroxy-
6-methyl-gamma-aminoheptanoic acid,
(3S,4S)-3-Hydroxy-4-[[(2S)-2-[[(3S,4S)-3-hydroxy-6-methyl-4-[[(2S)-3-methyl-2-[[(2S)-3-methy
l-2-(3-methylbutanoylamino)butanoyl]amino]butanoyl]amino]heptanoyl]amino]propanoyl]amin
o]-6-methylheptanoic acid; Pepstatin A
分子式:C34H63N5O9
分子量:685.89
Sigma相关资料如下:
P4265  Sigma 
Pepstatin A
microbial, ≥75% (HPLC)
CAS Number: 26305-03-3
Linear Formula: C34H63N5O9
Molecular Weight: 685.89
Beilstein Registry Number: 2201362
EC Number: 247-600-0
MDL number: MFCD00060740
PubChem Substance ID: 24898519
Description
Preparation Note Pepstatin can be dissolved at 1 mg/ml in 10% (v/v) acetic acid in methanol (9:1 methanol:acetic acid). The inclusion of acetic acid may be necessary to dissolve this peptide in methanol or DMSO. It has been dissolved at 1 to 2 mg/ml in ethanol, but heat may be required for complete dissolution. Solutions of Pepstatin A can be heated as high as 60 °C without any decomposition of the peptide.
Stock solutions at 1 mg/ml are stable at least a week at 4 °C. A 1 mM solution in methanol or DMSO is stable for months at -20 °C. If solutions become darker yellow, the reagent is hydrolyzing.
A working concentration of 1 μM is stable for at least one day at room temperature.
Biochem/physiol Actions Pepstatin A is an inhibitor of acid proteases (aspartyl peptidases). It forms a 1:1 complex with proteases such as pepsin, renin, cathepsin D, bovine chymosin, and protease B (Aspergillus niger). The inhibitor is highly selective and does not inhibit thiol proteases, neutral proteases, or serine proteases. Solubilized γ-secretase and retroviral protease are also inhibited by Pepstatin A. It has been used to characterize proteases from several sources.
性质
biological source microbial
assay ≥75% (HPLC)
mp 233 °C (dec.)(lit.)
storage temp. 2-8°C

2-8°C

E6376   正品|红霉素|Erythromycin|   品牌 Sigma

正品|红霉素|Erythromycin|

货号: E6376      产品名称: 正品|红霉素|Erythromycin|   品牌: Sigma 规格: 5G 大量现货

中文名:威霉素;福爱力;新红康;红霉素
英文名:Erythromycin, EM, EMU-V, Eryc, Ethryn, E-Mycin, Gluceptate, Ilotycin
说明:红霉素,由链霉素Stretomyces erythreus所产生,是一种碱性抗生素。其游离碱供口服用,乳糖酸盐供注射用。此外,尚有其琥珀酸乙酯(琥乙红霉素)、丙酸酯的十二烷基硫酸盐(依托红霉素)供药用。
性状:红霉素为白色或类白色的结晶或粉末;无臭,味苦;微有引湿性。在甲醇、乙醇或丙酮中易溶,在水中极微溶解。 
用途:抗菌谱与青霉素近似,对革兰阳性菌,如葡萄球菌、化脓性链球菌、绿色链球菌、肺炎链球菌、粪链球菌、梭状芽孢杆菌、白喉杆菌等有较强的抑制作用。对革兰阴性菌,如淋球菌、螺旋杆菌、百日咳杆菌、布氏杆菌、军团菌、以及流感嗜血杆菌、拟杆菌也有相当的抑制作用。此外,对支原体、放线菌、螺旋体、立克次体、衣原体、奴卡菌、少数分枝杆菌和阿米巴原虫有抑制作用。金黄色葡萄球菌对本品易耐药。
Sigma相关产品资料
E6376 Sigma-Aldrich Erythromycin
potency: ≥850 μg per mg
CAS Number: 114-07-8
Linear Formula: C37H67NO13
Molecular Weight: 733.93
Beilstein Registry Number: 75279
EC Number: 204-040-1
MDL number: MFCD00084654
PubChem Substance ID: 24894626
Description
Biochem/physiol Actions Mode of Action: Inhibits elongation at transpeptidation step.
Antimicrobial spectrum: Gram-negative and Gram-positive bacteria.
Other Notes Macrolide antibiotic.
Properties
potency ≥850 μg per mg
Gene Information human … ABCB1(5243), CYP3A4(1576), MLNR(2862)
  mouse … Abcb1a(18671), Abcb1b(18669)

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C0378   正品现货|Chloramphenicol|氯霉素   品牌 Sigma

正品现货|Chloramphenicol|氯霉素

货号: C0378      产品名称: 正品现货|Chloramphenicol|氯霉素   品牌: Sigma 规格: 5g 大量现货

英文名: Chloramphenicol , D(-)-threo-2-Dichloroacetamido-1-(p-nitrophenyl)-1,3-瞤ropanediol
性   状: 针状或细长的片状结晶。真空时升华。25℃时溶解度:水中2.5mg/ml、丙二醇中150.8mg/ml。易溶于甲醇、乙醇、丁醇、乙酸乙酯、丙酮,微溶于乙醚,不溶于苯、石油醚、植物油。水溶液呈中性。中性或酸性溶液受热时稳定。熔点150.5~151.5℃。比旋光度[α]27D+18.6°(c=4.86,乙醇中),[α]25D-25.5°(乙酸乙酯中)。最大吸收波长278nm(E1%1cm298)。
用   途:生化研究。组织培养基。医药
Simga相关产品资料
Sigma  C0378 Chloramphenicol
≥98% (TLC)
Synonym: Chloromycetin®, D-threo-2,2-Dichloro-N-[β-hydroxy-α-(hydroxymethyl)-4-nitrophenethyl]acetamide, D-(−)-threo-2,2-Dichloro-N-[β-hydroxy-α-(hydroxymethyl)-β-(4-nitrophenyl)ethyl]acetamide, D-(−)-threo-2-Dichloroacetamido-1-(4-nitrophenyl)-1,3-propanediol
CAS Number: 56-75-7
Linear Formula: Cl2CHCONHCH(CH2OH)CH(OH)C6H4NO2
Molecular Weight: 323.13
Beilstein Registry Number: 2225532
EC Number: 200-287-4
MDL number: MFCD00078159
PubChem Substance ID: 24892250
Description
Biochem/physiol Actions Mode of Action: Inhibits translation on the 50S ribosomal subunit at the peptidyltransferase step (elongation inhibition). Bacteriostatic.
Mode of Resistance: Acetylation by chloramphenicol acetyltransferase (cat gene).
Legal Information Chloromycetin is a registered trademark of Parke-Davis & Co.
Properties
assay ≥98% (TLC)
mp 148-150 °C(lit.)
Gene Information human … CYP1A2(1544)

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R4875   正品|RNase A|Rnase I|Rnase|Ribonuclease A|核糖核酸酶A|   品牌 Sigma

正品|RNase A|Rnase I|Rnase|Ribonuclease A|核糖核酸酶A|

货号: R4875      产品名称: 正品|RNase A|Rnase I|Rnase|Ribonuclease A|核糖核酸酶A|   品牌: Sigma 规格: 50mg 大量现货

中文名:核糖核酸酶I,核糖核酸酶A
英文名:Ribonuclease,bovine pancrease,Ribonuclease I,Ribonuclease A,Pancreatic ribonuclease,Ribonucleate pyrimidinenucleotide-2′-transferase,Ribonucleate 3′-pyrimidino-oligonucleotidohydrolase,Rnase I,Rnase,Rnase A
分子量:相对分子质量13000~15000
性状:一种水解核糖核酸的酶。商品为白色结晶或冻干粉末,也有50%甘油的稠状溶液。对湿敏感。极易溶于水。酶反应:专一地催化核糖核酸的核糖部分3′和5′磷酸二酯键的裂开,形成具有2′,3′-环一磷酸衍生物寡聚核苷酸。水溶液在25℃以下相当稳定,最大稳定范围pH 2~4.5。最适pH 7.7。最适温度65℃。等电点(pI)7.8。比旋光度 [α]25D-0.47°(以每mG氮计,c=5,水中)。抑制剂有0.0005mol/L镁(MG2+)、脱氧核糖核酸(竞争性抑制剂)、变性脱氧核糖核酸(比天然的更有效)。
用途:生化研究,测定核酸的结构,脱氧核糖核酸和核糖核酸的降解。核糖核酸酶 A (Ribonuclease A)来源于牛胰,为高度专一性核酸内切酶,可特异攻击 RNA 上嘧啶核苷酸的C′3上的磷酸根和相邻核苷酸的C′5之间的键,产物为3′嘧啶单核苷酸或以3′嘧啶核苷酸结尾的低聚核苷酸。可除去 DNA:RNA或RNA:RNA杂合体中未杂交的 RNA 区;可用来确定 DNA 或 RNA 中单碱基突变的位置, 用标记了的RNA探针与待检含单碱基置换的DNA或RNA退火,RNA:RNA或RNA:DNA中的错配碱基可被RNaseA切割。广泛用来去除 DNA 样品中的 RNA 。
Sigma相关产品资料:
Sigma  R4875 
Ribonuclease A from bovine pancreas
Type I-A, powder, ≥60% RNase A basis (SDS-PAGE), ≥50 Kunitz units/mg protein
Synonym: Pancreatic Ribonuclease, Ribonuclease I, Ribonucleate 3′-pyrimidinooligonucleotidohydrolase, RNase A
CAS Number: 9001-99-4
Enzyme Commission (EC) Number: 3.1.27.5  ( BRENDA  | IUBMB  )
EC Number: 232-646-6
MDL number: MFCD00132181
Description
Analysis Note Protein determined by E1%/280.
Application • RNase protection assays
• Remove unspecifically bound RNA
• Analysis of RNA sequences
• Hydrolyze RNA contained in protein samples
• Purification of DNA
Pancreatic RNase A specifically cleaves at the 3′-side of pyrimidine (uracil or cytosine) phosphate bonds. Ribonucleases do not hydrolyze DNA, because the DNA lacks 2′-OH groups essential for the formation of cyclic intermediates. RNase can also hydrolyze RNA from protein samples.
Preparation Note Salt fractionated and chromatographically purified.
性质
type Type I-A
assay ≥60% RNase A basis (SDS-PAGE)
form powder
m −20°C

10107409001-5MG   正品供应|Mitomycin C   品牌 Roche

正品供应|Mitomycin C

货号: 10107409001-5MG      产品名称: 正品供应|Mitomycin C   品牌: Roche 规格: 5MG分 现货

Mitomycin C
Application
Inhibitor for studies of cell-free protein biosynthesis. Mitomycin C inhibits DNA synthesis.
Product Description
Formula: C15H18N4O5
Molecular weight: Mr = 334.3
Quality
Purity: 98% (from N)

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A0512   进口正品|Amylose|直链淀粉   品牌 Sigma

进口正品|Amylose|直链淀粉

货号: A0512      产品名称: 进口正品|Amylose|直链淀粉   品牌: Sigma 规格: 250mg 现货

详细介绍:直链淀粉 amylose 系与支链淀粉一起构成淀粉粒的主要成分(一般占20—25%),是吡喃葡萄糖仅以α-1,4-键连接的长键化合物,亦称β-直链淀粉。在水中不膨胀而溶解,但与热水不能形成典型的糊,冷却时与碘呈蓝色反应,分子量约5万。从溶于温水或稀酸的淀粉可溶部分加酒精沉淀而得到,其中也有极少的β-1,6-分支,在麦芽中的α-淀粉酶和β-淀粉酶(切断α-1,4键)以及异淀粉酶的共同作用下,可完全水解至麦芽糖。
直链淀粉的特性:
  直链淀粉具有抗润胀性,水溶性较差,不溶于脂肪;
  直链淀粉不产生胰岛素抗性;
  直链淀粉糊化温度较高,糯淀粉为73℃,而直链淀粉为81.35℃;
  直链淀粉的成膜性和强度很好,粘附性和稳定性较支链淀粉差;
  直链淀粉具有近似纤维的性能,用直链淀粉制成的薄膜,具有好的透明度、柔韧性、抗张强度和水不溶性,可应用于密封材料、包装材料和耐水耐压材料的生产。
  直链淀粉是由葡萄糖以α-1,4-糖苷键结合而成的链状化合物,能被淀粉酶水解为麦芽糖。在淀粉中的含量约为10~30%。能溶于热水而不成糊状。遇碘显蓝色。
Sigma相关产品资料:
Sigma  A0512 Amylose from potato
Type III
CAS Number: 9005-82-7
Linear Formula: (C6H10O5)n
EC Number: 232-685-9
MDL number: MFCD00134652
PubChem Substance ID: 24890430
Description
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Substrates A substrate for serum amylase.
Properties
type Type III
total impurities amylopectin, essentially free
  ≤10% butanol
EQP level Premium

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D5025   正品|Deoxyribonuclease I|DNase I|脱氧核糖核酸酶Ⅰ   品牌 Sigma

正品|Deoxyribonuclease I|DNase I|脱氧核糖核酸酶Ⅰ

货号: D5025      产品名称: 正品|Deoxyribonuclease I|DNase I|脱氧核糖核酸酶Ⅰ   品牌: Sigma 规格: 15KU 大量现货

英文名: DNase I,Deoxyribonuclease I
中文名称: 脱氧核糖核酸酶I
说明: 脱氧核糖核酸酶I是一种可以消化单链或双链DNA产生单脱氧核苷酸或单链或双链的寡脱氧核苷酸的核酸内切酶。DNase I水解单链或双链DNA后的产物,5’端为磷酸基团,3’端为羟基。
  DNase I活性依赖于钙离子,并能被镁离子或二价锰离子激活。镁离子存在条件下,DNase I可随机剪切双链DNA的任意位点;二价锰离子存在条件下,DNase I可在同一位点剪切DNA双链,形成平末端,或1-2个核苷酸突出的粘末端。
特点:不含RNase(RNase free),可以用于各种RNA样品的处理。提供了用于DNase I失活所需的EDTA。
用途:制备不含DNA的RNA样品;RT-PCR反应前RNA样品中去除基因组DNA等可能的DNA污染;体外T7, T3, SP6等RNA Polymerases催化的RNA转录后去除DNA模板; DNase I footprinting研究DNA-蛋白质相互作用;缺口平移(nick translatioin);产生DNA随机片断文库;细胞凋亡TUNEL检测中部分剪切基因组DNA作为阳性对照。
来源:从牛胰腺纯化得到。
分子量:约32kDa(单体)。
活性定义:37℃10分钟内,将能够完全降解1μg pBR322质粒DNA所需的酶量定义为1个活性单位。
活性检测条件:40mM Tris-HCl(pH8.0),10mM MgSO4,1mM CaCl2,1μg of pBR322 DNA。
 纯度:不含其它DNA内切酶和外切酶,不含RNA酶。
 酶储存溶液:50mM Tris-acetate(pH7.5),10mM CaCl2,50%(v/v)glycerol。
 Reaction Buffer(10X):100mM Tris-HCl(pH7.5 at 25℃),25mM MgCl2,1mM CaCl2。
 失活或抑制:加入EDTA至终浓度为2.5mM后,65℃加热10分钟可使DNase I失活。酚氯仿抽提也可以使DNase I失活。金属离子螯合剂,达到毫摩尔/升浓度的锌离子,0.1%的SDS,DTT、巯基乙醇等还原剂,50-100mM以上盐浓度均对DNase I有显著抑制作用。
-20℃保存。
注意事项:  如需对酶进行稀释,可以用酶储存液(50mM Tris-acetate(pH 7.5),10mM CaCl2,50%(v/v)glycerol)进行稀释。
Simga相关产品资料
Sigma D5025 Deoxyribonuclease I from bovine pancreas
Type IV, lyophilized powder, Protein ≥80 %, ≥2,000 Kunitz units/mg protein
Synonym: Deoxyribonucleate 5′-oligonucleotido-hydrolase, DNase I
CAS Number: 9003-98-9
Description
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Analysis Note Protein determined by biuret.
Application Used for the removal of DNA from protein samples.
Preparation Note Derived from New Zealand-sourced pancreas
Unit Definition One Kunitz unit will produce a ΔA260 of 0.001 per min per mL at pH 5.0 at 25 °C, using DNA, Type I or III as substrate. [Mg2+] = 4.2 mM.
Physical form Lyophilized powder containing calcium chloride
Properties
type Type IV
form lyophilized powder
mol wt mol wt ~31 kDa
purified by chromatography
composition Protein, ≥80%
EQP level Premium
foreign activity Chymotrypsin ≤0.5%
  Protease ≤0.05%
  RNase ≤0.02%
storage temp. −20°C
Safety
Safety Statements 22-24/25
WGK Germany 3
RTECS RF0750000

-20度

E6883   正品|Pancreatopeptidase E|Elastase|弹性蛋白酶(猪胰)|   品牌 Sigma

正品|Pancreatopeptidase E|Elastase|弹性蛋白酶(猪胰)|

货号: E6883      产品名称: 正品|Pancreatopeptidase E|Elastase|弹性蛋白酶(猪胰)|   品牌: Sigma 规格: 50MG 大量现货

Elastase from porcine pancreas
Type II-A, lyophilized powder, Protein ~70 %, ≥1 units/mg protein (biuret)
Synonym: Elastase from hog pancreas Pancreatopeptidase E
CAS Number 39445-21-1
type    Type II-A 
form    lyophilized powder 
composition    Protein, ~70% 
foreign activity    trypsin ≤500 BAEE units/mg protein 
storage temp.    −20°C
 

-20度

LP0032J   正品|胨化牛奶|Peptonised Milk|   品牌 Oxoid

正品|胨化牛奶|Peptonised Milk|

货号: LP0032J      产品名称: 正品|胨化牛奶|Peptonised Milk|   品牌: Oxoid 规格: 250G 现货

产地:Oxoid 
货号:LP0032 
规格:250G
名称:胨化牛奶 Peptonised Milk  
Typical analysis              (% w/w)
Total Nitrogen                  5.3
Amino Nitrogen                  1.8
Sodium chloride                 1.6
Tryptophan                      0.53
pH (2% solution)              6.0-6.5
This is a pancreatic digest of high grade skimmed milk powder. It constitutes a source of nitrogen more readily available than milk or milk powder and has a high level of carbohydrate. As with milk powder, the calcium level is relatively high.
The product may be used on its own or in conjunction with other ingredients in media for isolation of lactobacilli and bacteriological examination of dairy products.
It has a high tryptophan content and is therefore used in media for testing the indole reaction.
高质量脱脂乳粉的胰酶消化物,含有丰富的碳源和钙,特别适合乳制品的细菌检测。

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G0500   热销正品|D-Galactosamine|D-氨基半乳糖   品牌 Sigma

热销正品|D-Galactosamine|D-氨基半乳糖

货号: G0500      产品名称: 热销正品|D-Galactosamine|D-氨基半乳糖   品牌: Sigma 规格: 250mg 现货

英文名: D(+)Galactosamine hydrochloride;2-Amino-2-deoxy-D-galactopyranose hydrochloride;D-Chondrosamine hydrochloride
中文名: D-氨基半乳糖;
外观:白色或类白色粉末
特性:纯度:≥99%
杂质:≤0.1% 葡萄糖胺, essentially free (HPAE)
溶解性:溶于水,参考浓度50mg/ml。
储存条件:4℃
SIGMA相关资料如下:
Sigma  G0500  D-(+)-Galactosamine hydrochloride≥99%
Synonym: 2-Amino-2-deoxy-D-galactopyranose hydrochloride, D-Chondrosamine hydrochloride
CAS Number: 1772-03-8
Linear Formula: C6H13NO5 • HCl
Molecular Weight: 215.63
Beilstein Registry Number: 3697825
EC Number: 217-198-1
MDL number: MFCD00135830
PubChem Substance ID: 24894912
Description
Packaging 10 mg in autosmp vl
性质
assay ≥99%
total impurities ≤0.5% Glucosamine (HPAE)
安全性
Personal Protective Equipment Eyeshields, Gloves, type N95 (US), type P1 (EN143) respirator filter
WGK Germany 3
RTECS LW5500000
Beilstein Beil. 4,IV,2024
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2-8°C

M4125   正品|Mannite(D-Mannitol,甘露醇)   品牌 Sigma

正品|Mannite(D-Mannitol,甘露醇)

货号: M4125      产品名称: 正品|Mannite(D-Mannitol,甘露醇)   品牌: Sigma 规格: 500G 现货 糖醇甜促味剂,用于甜味抑制研究。

M4125                                                                               &nbsp;                                                                                                                                                                                                                                          正品|Mannite(D-Mannitol,甘露醇)&nbsp;&nbsp;                                                                                 品牌                                                                                                                                                         Sigma

产地:sigma
货号:M4125
规格:500G
D-甘露糖醇
D-Mannitol
别名: 甘露醇
CAS号 69-65-8
assay    &ge;98%
mp    167-170 &deg;C(lit.)
Biochem/physiol Actions
糖醇甜促味剂。用于甜味抑制研究。

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