montena technology sa
Route de Montena 89
1728 Rossens
Tel. +41 26 411 84 84
Fax +41 26 411 17 79


Pulsed light effects

The effectiveness of the pulsed light has been proven on many types of microorganisms, such as : bacteria, mould, virus, etc.. The result of the light flash is a combination of photothermal and photochemical effects.

Photochemical : the absorption spectrum of the DNA structure is between 190 and 300 nm, corresponding to UV emitted during the flashes. With pulsed light, the DNA chain is disrupted or the molecules can be broken.

Photothermal : due to their small size the microorganisms see a sudden temperature increase, which breaks their cellular membranes. Heat transfer through infrared and visible radiations (up to 200°C) take place at a microscopic level, within some microseconds. The overall product temperature remains unchanged.

Montena and CTCPA have tested the antimicrobial effectiveness on various bacteria such as :

Bioindicator   Inoculation Contamination level Average reduction
Aspergillus niger ATCC 16404 Spore-forming bacterium UV-resistant A 8,2 10^5 > 5 log
B 5,7 10^5 > 5 log
Strain Globigii ATCC 9372 Bacillus subtilis var. niger Spore-forming bacterium resistant to oxidizing agents A 6,5 10^6 > 6 log
B 2,0 10^5 > 5 log
Geobacillus stearothermophilus ATCC 7953 Spore-forming bacterium heat-resistant A 2,3 10^6 > 6 log
B 6,1 10^6 > 6 log
Bacillus pumilus ATCC 27142 Spore-forming bacterium resistant to ionizing radiations A 4,8 10^5 > 5 log
B 5,7 10^5 > 5 log
Alicyclobacillus acidoterrestris
ATCC 49025
Spore-forming bacterium acidic PH-resistant A 2,3 10^5 > 5 log
B 7,1 10^5 > 5 log
A: aerograph technic : contamination of the substrate PE 40x50mm with a spaying method
B: spot technic : contamination of the 1cm2 metal substrate with a suspension of some µl.    2 flash treatment

In addition, montena and CTCPA have done a toxicology studies. Vitamins, finished product from lipidic oxidation (TBA), products from the Maillard reaction (CML and lysine available, acrylamide) remain very low and do not exhibit an oxidation mechanism.

The pulsed light does not influence the product color, or its organoleptic properties.

Gepulstes Licht