» What’s under the shell of this popular snack?

FOOD SCIENCE

What’s under the shell of this popular snack?

Story by Chad Campbell

February 7, 2020

N

o country grows or consumes more popcorn than the United States and only one state, Nebraska, produces more popcorn than Indiana. Consequently, it’s surprising that in 2019, only 75,000 of Indiana’s 5 million corn acres contained popcorn.

The hard outer hull of popcorn, called the pericarp, explains why 1.5 percent of the state’s corn pops while none of the rest can.

Bruce Hamaker, distinguished professor of food science and Roy L. Whistler Chair, found that the best popping kernels have a stronger pericarp, maximizing moisture retention.

“Popcorn must have moisture inside the kernel of about 13 to 14.5 percent of its total weight,” explained Hamaker.

The kernel acts as a pressure cooker, building force as the water inside heats and vaporizes.

“When the pressure reaches a certain point, the outside layer of the kernel ruptures and the kernel pops with a rapid expansion of the now gelatinizing starch.”

Essentially, the kernel turns inside out, giving popcorn its distinct look.

Bruce Hamaker smiling
Bruce Hamaker, Photo by Tom Campbell
A kernel expanding, step by step

In Hamaker’s research, 4 to 47 percent of kernels, dependent on variety, were unsuccessful in their transformation.

“Some kernels don’t pop because they have cuts or weaknesses in the outside layer of the popcorn kernel that let the moisture leave on heating.”

Hamaker conducted his research at Purdue in the university’s tradition of popcorn expertise. The legacy includes agronomy alumnus Orville Redenbacher, the entrepreneur behind America’s most popular popcorn brand, and Bruce Ashman, who began his leadership of Purdue’s hybrid popcorn breeding program in the 1960s.

An open bag of popcorn

When Ashman retired in 1996, he became a consultant to Ag Alumni Seed, a leader in the development and release of popcorn hybrids. The business was founded in 1938 by the Purdue Agriculture Alumni Association, shortly after The Great Depression.

During the depression, popcorn rose in popularity as one of the few affordable snack options. Movie theaters fought the trend at first, finding it counterintuitive to the posh reputation they originally held, but soon embraced it as a stream of revenue.

Today, popcorn is recognized for its healthiness, as well as its affordability. “Popcorn is like other types of corn in that it is mostly starch (~70%), and lesser amounts of protein (~8%), fiber (~5%) and fat (10%),” noted Hamaker. “To me, the popped kernel itself is healthy, though nowadays there is a feeling by some consumers that carbohydrates are not so healthy. Beyond that, people often add butter or oil and usually add salt.”

Promoting nutrition and unique flavors, ready-to-eat popcorn has recently gained popularity as a premium snack. With new ingredients, flavors and markets, who knows where the classic snack will pop up next.

Lots of popped popcorn

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