Monthly Archives: August 2016

ATP Meets Luminometer

When I joined the lab team in May I was familiar with lab equipment and testing but I wasn’t familiar with luminometers and ATP. I had heard of ATP in my biochemistry class back in college and how the body uses ATP but I wondered: how does that relate to plant sanitation and luminometers? To better understand the relation, it is easier if we break down the two components, ATP and luminometers and then bring it together.

ATP (Adenosine triphosphate)

Adenosine triphosphate better known as ATP can be found in all types of organic matter: plant, animals, and microbial cells. ATP is the energy source in all living cells. Since there is ATP in bacteria, and yeast and mold, it is key to monitor cleaning processes, but it can’t be the only monitoring of a clean surface. With plant material, like sugars, and starches, also having ATP, ATP testing can only verify the sanitation operating procedures. So, for example, consider walking into a hotel room and everything looks clean. However, we’ve all seen those stomach turning news reports about the true cleanliness of hotel bathrooms and we can’t forget the dreadful black light test on beds and floors.  What looks clean is not always clean.  So here comes in the luminometer to verify our cleanliness.


An ATP luminometer(in conjunction with ATP swabs) is a fast and easy way to help food processors assess and validate the hygienic status of food contact surfaces. Luminometers provide an objective, recordable verification of a sanitation efficacy in a food/beverage operations.   Interestingly enough, “The science behind the luminometer is based on the enzyme luciferase-the same enzyme that makes firefly tails glow. Residual ATP interacts with luciferase to generate light.”  There are several brands of luminometers on the market,with varying protocol, but the steps for testing are relatively the same. A small surface is selected for sampling, typically a 4in x 4in or 10cm x 10cm area. While maintaining a constant pressure during swabbing, apply zigzag strokes over the selected surface, as you see here:
Figure 1

Once the selected surface is swabbed, the swab is put back into the swab tube where it is “exposed to an ATP-releasing agent (lysis buffer) and an ATP-activated light-producing substrate and enzyme (luciferin and luciferase)” . The swab is then put into the luminometer chamber where it reads the enzymatic reaction that occurs between ATP and the luciferin/luciferase, measuring RLUs or relative light units. The higher the RLUs the more ATP present on the swabbed surface. The specification limits must be set by each plant to determine what is pass, warning and fail.

Bringing it All Together

Now that we know what ATP is and what a luminometer is and how they work together we can figure out what a luminometer can and cannot do in regards to plant sanitation. Since ATP is in all living cells (including bacteria, yeast, mold, carbohydrates, protein, and others), a luminometer can only validate that the sanitation process has been thoroughly completed. A luminometer cannot and does not test for microbes.   When used on the production line, luminometer results can determine if the production line will need to be re-cleaned or if production can resume or start up again. In essence, it is an indicator that your cleaning processes are meeting sanitary standards, to help you produce a safe product.   There are many aspects in selecting the best way to validate your sanitation process. If an ATP system is used, it can’t be the only system in place and does not constitute an environmental sample program within itself. Consult regulatory bodies and professional associations to find out what necessary precautions needs to be put in place to prevent cross-contamination and food-borne pathogens.  That being said, a quality ATP system can be a quick and easy preventative control to have in your food safety and QA/QC programs.

Cheese Heists, Wing Rings and Nut Jobs: Global Crime Rings Are Stealing Food

Food Burglar


Large-scale food theft is the plat du jour on criminal menus as of late. In fact, food and beverages have replaced electronics as the most-stolen good in the United States, with an estimated $21 million worth of food and beverages stolen in 2015. Products range from alcohol, meat ($41,000 in chicken wings by a father and son team in New York), and dairy (especially cheese and ice cream) to produce, nuts and seeds.  Thieves find edibles appetizing targets because the value is high and the risk is relatively low—many perishables don’t have serial numbers and can’t be tagged or traced.

Who Moved My Cheese

Cheese is currently the most stolen food item in the world. In the last 3 years, almost $425,000 worth of cheese has been stolen in Wisconsin alone—including $90,000 in Marshfield near Nelson-Jameson’s headquarters and $46,000 worth just a month ago near Milwaukee. Any way you slice it, that’s a whole lot of cheddar. Gouda thing for the dairy industry, it’s not that easy to get away with stealing lotza mozza. Cheese is a highly-regulated food, with documentation implemented at various stages of production and distribution—from paperwork to truck seals. Thus, most of the recent queso the stolen cheeses have been solved.

Going Nuts

Some of the most sophisticated and frequent shell games involve the nut industry in California, with almonds, walnuts and pistachios targeted most often. And the thieves are clearly on a (nut) roll: in the past 9 months, more than $10 million worth of product has been stolen from the California supply chain, which is about $3 million more than the amount stolen in the last 4 years.  It is believed that most of the stolen nuts are being sold for export, as they have a long shelf-life, are relatively untraceable and have increased in global value and popularity. Fortunately, the nut industry is doing their best to crack the case. Since most of the thefts take place during the logistics process, extra safety and security measures have been implemented that include radio-frequency identification (RFID) tags and fingerprinting and photographing truck drivers. Police task forces have also been recently increased.

An Issue of Both Economics and Public Health

While we often laugh when we hear that someone’s stolen 600 barrels of maple syrup, don’t let the puns and humor detract from the economic damage the stolen food black market inflicts. It negatively impacts growers, agricultural laborers, processors, logistic companies, distributors, retailers and insurers. Eventually, the loss of income is passed onto the consumer through food shortages and raised prices. Food safety is also an issue. Like the California man that was caught selling unrefrigerated, stolen orange juice out of his garage, most thieves don’t care about proper handling and storage of the product. Clearly, the risk of foodborne illness combined with far-reaching monetary losses make food crime a seriously unpalatable concern that needs to be addressed with some importance. For more information on the FDA’s cargo theft policies and notices, please see .