Highly Sensitive Assay to Screen for Benzoic Acid Visual Readout (sample dependent: milk, red/pink) Detection range of 1ppm to 1500ppm Tube or Plate based options available Compatible with the Nix Sensor or plate readers to obtain quantitative results.
The Benzoic Acid Detection Kit provides a rapid, simple, sensitive, and reliable test suitable for screening of Benzoic Acid concentration.
Benzoic Acid is a white solid that is an extensively used preservative. Although this preservative prevents or delays nutritional losses due to microbiological, enzymatic or chemical changes of foods during its shelf life there is a suspicion that small amounts of benzene may be formed from benzoic acid in nonalcoholic beverages in the presence of ascorbic acid. Benzoic acid and ascorbic acid are food additives which must be declared on the food. Benzoic acid or E 210 is a preservative which also occurs naturally, for instance, in cranberries. A maximum amount of 150 mg/l benzoic acid may be added to non-alcoholic flavored beverages.
Other Products
TD4Z Mini Centrifuge – Vortex
Product Info
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Product Info
Product Highlights
Speed: Adjustable speed, up to 4500 rpm
Vortex Oscillation Intensity:1-4 intensity levels, selectable and adjustable
Programming:Programmable,freely choose combinations of oscillation strength,duration.centrifugation speed, and time
Safety:Safety interlock device to ensure user safety
Compatibility: Single tube or multi-tube centrifugation/mixing with one-button operation, saving time and cost
Display:Touch buttons and an LCD screen clearly indicate and set oscillation level, duration, and cycle count
Convenience: Multi-functional, compact design, occupies minimal space
Technical Specifications
Dimensions (mm)
200(w)x243(H)x127(D)
Working temperature
5℃ to 40℃
Oscillation Duration
0-30 seconds (increment of 1 second)
TD4Z Speed range
1000-3600 rpm (increment of 100 rpm)
Power Supply
AC 220V 50/60 Hz
Spin Timer
0 seconds to 30 minutes
Weight
3.5kg (including power supply)
Oscillation Intensity
Level 1-4
Speed range TD4Z
1-99 programs
Centrifugation Adjustment TD4Z
1000-3600 rpm (increment of 100 rpm)
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PCR laboratories and general molecular biology laboratories Model: TD4Z
For the determination of Escherichia coli in drinking water and its source water by multiple tube fermentation method.
Principle and Interpretation
MUG permits the rapid detection of Escherichia coli when the medium is observed for fluorescence using a UV light. MUG is hydrolyzed by the enzyme β-glucuronidase which is produced by E. coli to yield a fluorescent end product 4- methylumbelliferone. Trypticase provides the essential nutrients. Lactose is the fermentable carbohydrate. Sodium chloride maintains the osmotic equilibrium. The medium has a strong buffering system to control the pH in the presence of fermentative action. The bile salts inhibit gram-positive bacteria especially the Bacillus species and faecalStreptococci.
Formulation
Ingredients
/liter
Trypticase or tryptose
20 g
Bile salts No. 3
1.5 g
Lactose
5 g
K2HPO4
4 g
KH2PO4
1.5 g
NaCl
5 g
4-methylumbelliferyl-β-D-glucuronide (MUG)
50mg
pH6.9±0.2 at 25°C
Preparation
Weigh 37g of dry powder of this product, add 1L of distilled water or deionized water, stir, heat and boil until
completely dissolved, sterilize at 115℃ for 20min, cool to room temperature and set aside.
Quality Control
The following quality control strains were inoculated and cultured at 44.5℃±0.5℃ for 24h. The results are as follows:
Quality control strains
Growth
Escherichia coli ATCC25922
Blue-white fluorescence is produced under 366nm UV light
Salmonella typhimurium ATCC14028
No fluorescence under 366nm UV light
Enterococcus faecalis ATCC29212
Clear, no fluorescence
Storage and Shelf Life
2-30℃，Keep container tightly closed, avoid direct sunlight.
Use before expiry date on the label.
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.
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Intended Use For the determination of Escherichia coli in drinking water and its source water by multiple tube fermentation method. Principle and Interpretation MUG permits the rapid detec……
Propargyl-PEG4-bromide is a crosslinker that can be used in copper catalyzed azide-alkyne Click Chemistry to form a stable triazole linkage with azides. The bromide (Br) acts as a good leaving group for nucleophilic substitution reactions. Reagent grade, for research purpose. Please contact us for GMP-grade inquiries.
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Propargyl-PEG4-bromide is a crosslinker that can be used in copper catalyzed azide-alkyne Click Chemistry to form a stable triazole linkage with azides. The bromide (Br) acts as a good leaving group for nucleophilic substitution reactions. Reagent grade, for research purpose. Please contact us for GMP-grade inquiries.
