Large Capacity Refrigerated Centrifuge

Introduction

Intended Use

For the enumeration of enterococci in water and other liquids by the membrane filtration technique.

Principle and Interpretation

The growth of the entire accompanying Gram-negative microbial flora is inhibited by sodium azide. Enterococci reduce 2,3,5-Triphenyl tetrazolium chloride (TTC) to give a red formazan inside the bacterial cell, their colonies are thus red. Nitrogen, minerals, and amino acids are provided by the tryptose whilst yeast extract supplies vitamins. Glucose acts as the carbon source, dipotassium phosphate buffers the medium, and agar-agar is the solidifying agent.

Formulation

Ingredients	/liter
Tryptose	20.0g
Yeast extract	5.0g
Glucose	2.0g
Disodium hydrogen phosphate	4.0g
Sodium azide	0.4g
2,3,5-Triphenyl Tetrazolium chloride	0.1g
Agar	10.0g
pH 7.2±0.1 at 25°C

Preparation

Dissolve 41.5 g in 1 L of purified water. Heat in boiling water and agitate frequently until completely dissolved. Sterilize by further heat for 20 minutes in the boiling water bath.

Quality Control

Cultural characteristics observed after incubation at 34-38°C for 40-48hours

Quality control strains	Growth	Colony color
Enterococcus faecalis ATCC29212	Good growth,PR≥0.5	deep red coloured colonies
Escherichia coli ATCC25922	Total inhibition	–

Sorage and Shelf Life

Keep container tightly closed, store in a cool, dry place, away from bright light. Storage period of 3 years.

Precautions

1. When weighing the dehydrated medium, please wear masks to avoid causing respiratory system discomfort

2. Keep container tightly closed after using to prevent clumping.

Waste Disposal

Microbiological contamination was disposed by autoclaving at 121°C for 30 minutes.

Intended Use For the enumeration of enterococci in water and other liquids by the membrane filtration technique. Principle and Interpretation The growth of the entire accompanying Gram-neg……

• Screening of saxitoxin in shellfish samples as low as 50ppb in sample
• Format: 25 tests (12 tests, 12 controls)
• Filters, syringes, extract collection tubes, buffers
• Run Time: 30 Minutes

Description

Saxitoxins (STXs) are naturally occurring alkaloids produced by some marine dinoflagellates and by strains of various species of freshwater cyanobacteria.  Saxitoxin is one of the prevalent paralytic shellfish toxins (PSTs). It belongs to a family of potent neurotoxins with a molecular weight around 300 Da. Saxitoxin and its derivatives are alkaloids composed of a tetrahydropurine ring system with a highly polar guanidinium group. Due to their significant toxicity, saxitoxins are closely monitored in marine environments where they can accumulate in the food chain during harmful algal blooms (HABs).  An action level of 800ppb, or 80ug per 100grams of shellfish, has been established.

Screening of saxitoxin in shellfish samples as low as 50ppb in sample
Format: 25 tests (12 tests, 12 controls)
Filters, syringes, extract collection tubes, buffers
Run Time: 30 Minutes

N-Boc-N-bis(PEG2-propargyl) enables Click Chemistry reactions with azide-bearing compounds or biomolecules via copper catalyzed Click Chemistry. The Boc-protected amine can be deprotected under acidic conditions. Reagent grade, for research purpose. Please contact us for GMP-grade inquiries.

N-Boc-N-bis(PEG2-propargyl) enables Click Chemistry reactions with azide-bearing compounds or biomolecules via copper catalyzed Click Chemistry. The Boc-protected amine can be deprotected under acidic conditions. Reagent grade, for research purpose. Please contact us for GMP-grade inquiries.