9 Food & Beverage Analysis Cryogenic homogenisation of food samples
Retsch’s knife mill GRINDOMIX GM 200 is employed in laboratories all over the world for the homogenisation of food samples as well as samples with a high water, oil, sugar or fat content. A range of new accessories makes it now suitable for cryogenic grinding of moist samples without addition of water or of very sticky samples, using dry ice.
The so-called cryo kit offered by Retsch consists of a full metal knife and a special stainless-steel grinding container with lid. The knife used for cryogenic grinding has four blades and is made entirely of steel. This makes it much more resistant against embrittlement and hard impact effects - which occur when frozen food is processed – than the standard knife with plastic components. For the same reason, the stainless-steel grinding container should be used for hard samples. This container is specially designed for cryogenic grinding, with baffles that ensure thorough mixing of the sample and, as a result, optimum homogenisation. To prevent overpressure inside the closed jar caused by the frozen CO2 which is warmed during the grinding process with dry ice and evaporates, the special lid features a small opening to let carbon dioxide escape.
The GRINDOMIX GM 200 knife mill covers a wide application range, from granular products like rape seed, rice, soybeans to fibrous or tough samples like meat, fish, candy, cheese or plants. It processes sample volumes up to 700 ml quickly and effectively. Thanks to reproducible
setting of parameters, programs and sequences, this mill ensures analytical results with minimum standard deviation. View the video:
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Measuring peroxidase in milk
When using raw milk make sure that no bacterial contamination and foodborne illness will ruin the festivities when eating your wonderful barfi, gulab jamun, jalebi, or peda. You can guarantee the safety of milk by consuming pasteurised milk. However, you will still need to test it for peroxidase. Read the application note to learn how to proceed using MQuant® Peroxidase test strips from Merck for a rapid in process testing.
Peroxidase testing is an important quality control measure in the dairy industry to ensure that milk is safe for consumption. Testing for peroxidase in milk is a method used to determine if the milk has been adequately pasteurised. Peroxidase is an enzyme that is naturally present in raw milk but is destroyed during pasteurisation. If peroxidase activity is detected in milk, it may indicate that, the milk has not been pasteurised properly, has been contaminated after pasteurisation, or is raw milk.
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ilmt.co/PL/LeYz 61441pr@reply-direct.com ADVERTORIAL Deliver consistently high-quality food & drink with Xylem Lab Solutions
Xylem’s analytical involvement spans across the food & beverage cycle; monitoring the water we use to irrigate crops, within production and cold-chain distribution processes before finally being displayed to consumers at supermarkets around the world.
As well as providing WTW brand premium quality inoLab® laboratory meters and Sentix® electrodes that provide measurement of key parameters such as pH, conductivity, turbidity and temperature in the production process, OI Analytical GC detectors commonly analyse several raw materials for authenticity and pesticide residue. Meanwhile, the YSI 2900 Biochemistry Analyser can be found in specialist applications where low concentration sugar blends require control such as within the potato chip and tomato processing arenas, where results are displayed in less than a minute.
One of the most common instruments is undoubtedly a refractometer, used for determining the °Brix of sugar containing foodstuffs as well as other liquid blends. Bellingham + Stanley has been manufacturing refractometers for over a century, and the latest OPTi® digital handheld and RFM precision laboratory refractometers can be found controlling the dilutions of many recognised household products often alongside SI Analytics Titroline® titrators that not only analyse acid content but also the blend ratio of non-sugar based diet drinks.
The newly launched DSG Series of density meters compliment this measurement capability. Comprised of two instruments (DSG40 with 4 decimal place precision, and DSG50 with 5 decimal point precision) the DSG Series offers flexibility for your laboratory.
When it comes to safety within the cold- chain distribution process, ebro’s EBI 300 Series of USB data loggers provide a viable method of ensuring fresh fruit, vegetables, meat & fish stays within safe boundaries throughout its journey; whilst at the supermarket, EBI-25 wireless data loggers and WinLog® software constantly monitors refrigerated display cabinets.
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