Does the SurePure system give an oxidative taste to the milk?
At optimal exposure the SurePure photopurification system drastically reduces micro-organisms without causing oxidation. With over-exposure, the risk of milk oxidation is increased. This is exacerbated if processing occurs at high temperatures or if the milk has already begun to undergo enzymatic breakdown. However the system design prohibits dosage levels that would oxidize the product under normal operating circumstances.
Does the SurePure system have a negative effect on the protein, fat, lactose or vitamins in milk?
No, under normal operating conditions all the natural constituents stay intact in milk while using the SurePure photopurification technology.
Why use the SurePure system in conjunction with pasteurisation?
The SurePure system can be used on its own to process raw milk. However, some countries have legislation which mandates the use of pasteurisation.
Used in conjunction with pasteurisation SurePure photopurification can help to increase the shelf-life by at least 30%, depending on the quality of the raw milk, the filling and packaging of the product.
Can you make cheese, yogurt, ice-cream and cream with SurePure milk?
Yes, the SurePure system can actually enhance the quality of the products.
CHEESE: As a non-thermal treatment the process benefits the organoleptic profile of cheese. However, care should still be taken to ensure good quality of the raw material (milk) used. If raw milk that is within legal specification is photopurified, the final product will conform to legal final product specifications for the cheese manufactured. According to most regulations relating to milk and dairy products, raw milk should not be processed if it:
“…gives a standard plate count of more than 200 000 colony forming units per 1,0ml…”
“…exceeds the most probable number (MPN) of 10, 0 coliform bacteria per 1, and 0 ml milk or, if the test for coliforms described in paragraph 5 or 11 of Annex A is used, the number of colony forming units exceeds 20 per milliliter of milk…”
“…is found to contain any Escherichia coli in 0,01ml or raw milk. When the Eijkmann test is used, or any Escherichia coli in 1,0ml of raw milk...”
“…Standard Methods for Counting Somatic Cells in Bovine Milk, is found to contain an average of 500 000 or more somatic cells per 1,0ml of bovine milk…”
In combination with pasteurisation, SurePure enhances quality assurance and final product quality, with possibilities for extended shelf-life products and increased yields.
Can the SurePure system treat heat resistant organisms?
Yes, trials have been done successfully on heat resistant organisms.
Can the SurePure system treat spores in milk?
Yes, trials have been done successfully on spore-producing organisms, like endosporothermodurans.
What would the effect of SurePure be on ACB, Listeria and Lactobacillus, which are important spoilers in the food industry?
Different bacteria will need different dosage levels of UV-C to be inactivated. ACB, Listeria and Lactobacillus are effectively neutralized by UV-C. Trials conducted on ACB for example showed greater than 5 log reductions on ACB in 68 deg Brix grape concentrate. Lactobacillus in whey was reduced > log 6 with less than 650 J/L exposure.