It’s all in the package: Ground Beef

I'm not sure why I have this silly face.
I love to take #meatcounterselfies!

A few weeks ago, I made a quick stop in a local grocery store to pick up some stuff for office lunches. Of course, I had to swing by the meat counter for a #meatcounterselfie.

While I was there, I found four different examples of packaging ground beef in the retail case. So, I snapped a few pictures and made a quick facebook post. My post was so popular, I decided to recreate here in the blog.

Foam trays with over wrap.
One of the most popular types of packaging

Foam trays with over wrap. It's kinda like cling wrap. In the world of meat science, we call this aerobic packaging. It's aerobic because it allows oxygen to react with the protein and creates the bright red color consumers like to see.

This packaging type is pretty inexpensive and easy, but the oxygen makes the meat spoil in a couple of days. You also shouldn't freeze meat packaged this way because it's more likely to freezer burn.

Ground beef chubs

We call these packages ground beef chubs. These are 10-pound packages, but you can get chubs in 5-pound, 2-pound, and even 1-pound. They are not always in clear bags like this. Sometimes the chubs are white and only tie at one end.

This beef was packaged in the packing plant. That's good because it decreases the number of people that handled it and lowers the chances that it will spoil. They are essentially a vacuum package, which is why you see that purplish-red color. The vacuum isn't perfect. Sometimes a little air will get in on the ends.

Beef can stay safely in this package for several days, and you can stick it directly in the freezer.My friend, Dr. Casey Owens, commented that she likes to buy ground beef in these big chubs and divide it into 1-pound portions in zip-loc freezer bags. That’s a great way to save some money.

Modified atmosphere package

This is called a modified-atmosphere package. This ground beef was also packaged in the packing plant, so the number of times it’s been handled is decreased compared to foam tray packaging. It's kind of like a vacuum package because it's sealed, but it has a special blend of air in the package to help control the growth of bacteria and give the meat that pretty red color.

I wouldn't use this package to freeze the meat; I would re-package it in a zip-loc freezer bag or a home-vacuum packager.

Vacuum-sealed package

Last is a vacuum sealed package. This beef was packaged in the packing plant and is a completely sealed package. See how it's a purplish-red color?

This package will have the longest shelf-life, and meat will freeze in that package just fine. It's also nice and flat, so it will thaw easily, too.

The meat counter at this store had several different options of ground beef, and, as a meat head, it was exciting to me to see all these different ways to package it represented in one store. But, please know that all these packaging types are safe. Regardless of how the beef is packaged or processed or any claims made on the label, all ground beef should be cooked to 160 F and checked with a meat thermometer.

I have another neat post called 10 things you didn’t know about ground beef or you may enjoy any of my other posts about beef, food safety, or the labels you see on packages.

What questions do you have about things you see in the meat counter?

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Packaging questions: Purge

It’s one of my most commonly-asked questions.

What is the deal with that blood or water in my package of meat?

Beef steaks and purge
Photo courtesy Macc Rigdon

When you take your tasty cut of meat out of the package, there is a pinkish liquid that is left behind. Most of the time, there is even a little soaker pad in the package to soak it up.

What is that stuff?

Short answer:



It’s a combination of water, lactic acid, and meat pigments that seeped out of the meat.

Longer answer:



Soaker pad in a chicken tray

In science class, we all learned that our bodies are largely made up of water. The same is true for animals, and a high percentage of that water is held in the muscles and stays in the muscle when it’s converted to meat.

Water in the meat is what creates the juiciness we experience when we eat a juicy steak, a tender ham, or a succulent turkey (#tokenthanksgivingreference). Water helps give meat the texture and flavor we expect. Meat without water is jerky, dry and tough.

Think of the proteins in meat as a sponge. As the meat ages and the more it is handled (cut, shipped, packaged, etc.), the protein sponge loses its ability to hold onto water. So, the water seeps out of the meat over time.

When the water seeps out, the protein that gives meat its color (myoglobin) flows out with the water. That protein gives the purge its color. Although it’s similar to the protein that gives blood its color (hemoglobin), it is not blood.



Pork chops in a purge loss study
Meat scientists have lots of
creative ways to measure purge
Photo courtesy Macc Rigdon

The ability of the meat to hang on the water is dependent on several different things, including the species and age of the animal, the fatness and grade of the meat, the length of time since the animal was harvested, which muscle the cut of meat was from, and how the meat has been handled and processed. Meat scientists spend hours and hours trying to figure out purge and what causes it.

Sometimes meat processors will add a solution to meat cuts to make them more tender, flavorful and juicy. That solution can change the amount of purge in a package, but the presence of purge does not automatically mean that water or anything has been added to the meat. Most of the time, purge is just a natural result of water leaving the muscle.

Some of the water in meat will evaporate out when it’s cooked. That’s why cooked meat is lighter in weight than raw. As the meat is cooked, the myoglobin will denature and lose its red color. So the juice that runs out of a rare steak may still be pink or red, but the juice from a cooked steak is colorless.

So, the water in meat packages is just purge, water and a little myoglobin. Maybe we should give it a better name.

Vacuum packaged pork with purge
Photo courtesy Macc Rigdon 

 

Something I learned from writing this blog: When you ask your meat-scientist friends to send you pictures of purge, be prepared to get a whole lot of them! I wasn’t pleased with my own photos, and a whole community of meat scientists responded when I sent out a request for pictures on facebook. Thanks, friends!

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