N-(Propargyl-PEG2)-PEG3-N-Boc is a branched PEG linker with an alkyne group and a t-butyl ester. The alkyne group reacts with azide-bearing compound in coppper catalyzed azide-alkyne Click Chemistry reaction. The Boc group can be deprotected under acidic conditions. The amino group is reactive with carboxylic acids, activated NHS esters, and carbonyls. Reagent grade, for research purpose.
N-(Propargyl-PEG2)-PEG3-N-Boc is a branched PEG linker with an alkyne group and a t-butyl ester. The alkyne group reacts with azide-bearing compound in coppper catalyzed azide-alkyne Click Chemistry reaction. The Boc group can be deprotected under acidic conditions. The amino group is reactive with carboxylic acids, activated NHS esters, and carbonyls. Reagent grade, for research purpose.
This fast screening test kit contains 10 tests with everything needed for accurate results of unsafe lead levels in the field.
This is a revolutionary product designed to make Lead testing in water safe, easy, and affordable. This fast screening test kit contains 10 tests with everything needed for accurate results of unsafe lead levels. With reliable results in only 10 minutes, this test kit clearly gives results confirming Lead in water and conforming to the EPA guideline of 15 ppb (µg/L). The kit can test water quality from various sources including faucets, wells (ground water), and home purification systems.
Standards and Regulations for Lead [ACCLPP 2012]
High Blood lead levels (i.e., greater than 700ppb) can cause serious health effects, including seizure, coma, and death. Blood levels as low as 100ppb have been associated with adverse effects on cognitive development, growth, and behavior among children aged 1-5 years.
Sample method:
1. Take a first-draw sample
Immediately after opening a faucet or valve, collect a 250 mL sample. This sample should be from each tap used for consumption.
2. Take a flush sample
If first-draw sample results show elevated lead levels of 5 ppb or higher, collect a flush sample. To do this, ensure water has not been used for between 8 to 18 hours, then collect the sample at 30 seconds.
3. Take sequential samples
If you want to test a lead service line, collect 8 to 10 sequential samples, depending on how far the line is from the tap.
Screening of Lead in water samples 5-10 ppb
Format: 10 tests (5 tests/5 controls)
Run Time: 15 Minutes
For selective isolation and culture of Staphylococcus aureus.
Peptone and beef extract powder provides carbon, nitrogen, vitamins and minerals; D- mannitol to fermentable sugars; higher levels of sodium chloride to provide a higher osmotic pressure, suppress most non-staphylococcal microorganisms ; phenolsulfonphthalein as pH indicator; agar is medium coagulant. Typical pathogenic staphylococci (coagulase positive) D- mannitol produce acid fermentation and produce yellow colonies with a yellow halo, typically non-pathogenic Staphylococcus unfermented D- mannitol to form red colonies.
Formulation(per liter):
Pancreatic digest of casein 5.0g
Pancreatic digest of animal tissue 5.0g
Beef Extract 1.0g
Sodium Chloride 75.0g
Mannitol 10.0g
Phenol Red 0.025g
Agar 15.0g
Final PH 7.4±0.2
How to use：
1.Suspend 111g in 1L of distilled water , stirring heated to boiling to completely dissolve ,autoclave at 121℃ for 15 minutes.
2.Diluted and treated samples.
Quality control：
| Item | The name and number of strain | Growth | Colony Color |
| 1 | Staphylococcus aureus CMCC (B) 26003 | Good | Golden yellow |
| 2 | Staphylococcus epidermidis CMCC (B) 26069 | Good | Red |
| 3 | Escherichia coli CMCC (B) 44102 | Inhibition | — |
Storage: Keep container tightly closed, store in a cool, dry place, away from bright light. Storage period of 3 years.
Specifications: 250g/bottle
250g