Posts Tagged: olive oil

Students' olive-oil fraud buster wins international prize

A student team composed of some of the best and brightest young minds at UC Davis took the grand prize last week in an international competition for the high-tech biosensor they created to detect low-grade or adulterated olive oil.

The award was presented to the Aggie inventors during the finals of the three-day global iGEM (International Genetically Engineered Machines) competition in Boston. The competition, this year featuring 245 teams from Asia, Europe, Latin America and North America, challenges student teams to design and build biological systems or machines and present their inventions in the international competition.

The students had spent several months designing and building the palm-sized biosensor, which they dubbed OliView. The biosensor is equipped to quickly and easily evaluate the chemical profile of oil, providing producers, distributors, retailers and ultimately consumers with an effective, inexpensive way to ensure olive oil quality.

Verifying olive oil quality is a concern for consumers – many of whom are willing to pay higher prices for the health benefits and flavor of true, extra-virgin olive oil. And honest olive oil producers want to prevent other producers from passing off sub-par olive oil as the real deal, while retailers, distributors and producers want a quick, easy way to ensure olive oil quality.

In addition helping detect fraudulent olive oil, the students' new biosensor will also monitor for good oil that may have gone rancid with age. 

The team of undergraduate students included Lucas Murray, Brian Tamsut, James Lucas, Sarah Ritz, Aaron Cohen and Simon Staley, with Yeonju Song serving as the “shadow” or alternate team member. You can tune into Aaron Cohen's recent Nov. 6 Science Friday interview during a discussion of synthetic biology.

The full story and a brief video about the new olive-oil biosensor and this stellar team of young inventors are available at: http://news.ucdavis.edu/search/news_detail.lasso?id=11076.

Reports on olive-oil quality are available at the web site of the UC Davis Olive Center at: http://olivecenter.ucdavis.edu/research/reports.

Consumers need more information on olive oil

Olive oil is repeatedly in the news these days, but the stories often raise as many questions as they anwer:

• It’s touted as the “healthy oil." Does that hold true for cooking and eating raw?
• It adds a range of flavors to food. Just what is EVOO and should you pay more for it?
• You can choose “grassy” or “peppery” olive oil. But what does that mean?
• How can you tell if olive oils are adulterated with lesser-grade oils, or oils from entirely different plants?

A new survey, spearheaded by Dr. Selina Wang at the Olive Center at UC Davis, shows that consumers need more information about olive oil in order to make informed decisions. Consumers were asked a number of questions about olive oil. Surprisingly — or maybe not — consumers thought they know more about olive oil than they actually do. Many consumers aren’t savvy about cooking with olive oil or assessing its tastes and qualities.

Results of the survey indicate that “there are opportunities for producers to modify marketing practices to assist consumers in making better informed olive oil purchasing decisions.”

Reading the survey results will provide consumers with a lot of information about olive oil’s attributes and will help consumers make better purchasing choices.

More information about the survey:

• Read the UC Davis press release about the survey
• Read the full survey results
• UC Davis Olive Center

Other recent olive oil news stories:

• Olive oil ‘fridge test’ doesn’t reliably detect fraud, March 2013
• New olive oil testing program aims to boost quality and reliability, January 2013

Olive oil ‘fridge test’ doesn’t reliably detect fraud

Extra virgin olive oil is tasty and excellent for your health, but experts say as much as 70 percent of it sold in America is adulterated, or of a lower grade. How can you tell if your brand is the real deal?

One notion — the so-called “fridge-test” theory — says you can determine the purity of your extra virgin olive oil (EVOO) by putting it in your refrigerator. If it solidifies, you can trust your EVOO is pure — or so the theory goes.

Is that scientifically accurate?

No, according to new research from the UC Davis Olive Center. Testing seven samples under cold conditions over eight days, researchers discovered the fridge test is unreliable in detecting either the purity or quality of olive oil.

“None of our samples showed any signs of congealing after 60 hours in a laboratory refrigerator set to 40.5 degrees Fahrenheit,” said Dan Flynn, executive director of the UC Davis Olive Center. “Even after 180 hours, the samples never fully solidified.”

“Wouldn’t it be nice to have such a simple test that could indicate an olive oil’s market grade, but it is much more complicated than that,” said Paul Vossen, UC Cooperative Extension advisor in Sonoma and Marin counties. 

“All olive oils contain a small amount of saturated fatty acids that solidify at refrigerator temperatures,” said Vossen, an olive oil expert. “The amount of solidification is equal to the amount of saturated fatty acids in the oil, which depends mostly on the varieties of olives used to make the oil and to a lesser extent where the olives were grown. Solidification does not indicate freshness, purity, flavor, extra virgin grade, or any other quality parameter.” 

The fridge-test theory surfaced on a recent episode of The Dr. Oz Show which aired Feb. 11, 2013, to more than 3 million viewers. While cautioning his method isn’t fool-proof, Dr. Oz. encouraged viewers to test the purity of EVOO by seeing if it solidifies in the fridge.

“After the show aired, we were swamped with calls from people who were concerned they were being ripped off,” Flynn said.

So the Olive Center conducted a study. They refrigerated seven samples, including two EVOOs, an olive oil, a canola oil, a safflower oil, and two blends. Some samples showed minor congealing at the bottom of the bottles, but none solidified completely.

“It’s true that waxes and long-chain fatty acids in extra virgin olive oil can lead to the oil solidifying in the cold, although relative amounts of these compounds vary from oil to oil,” the study said.

Olive oils are graded based on how the oil is extracted from olives and on chemical and sensory standards. True extra virgin olive oil is extracted from olives without heat or chemicals and must have no defective flavors such as rancidity. Extra virgin olive oil is more expensive than other oils and is therefore an attractive product for fraud.

Using sensory and chemistry testing, the UC Davis Olive Center is working on dependable methods for detecting when an extra virgin olive oil is fraudulently labeled. In the meantime, the center advises consumers to choose an oil within 15 months of the harvest day (not the best-before date), look for a certification seal indicating that the oil passed chemical and sensory tests, and seek (and store) oils protected from light.

Florida citrus growers explore olive opportunities

Citrus growers in Florida, who are struggling with the devastating citrus disease huanglongbing, are considering growing olives, according to a report on the Tampa, Fla., ABC news affiliate.

Reporter Ryan Raiche covered a meeting at the University of Florida Citrus Research and Extension Center where UC Cooperative Extension farm advisor Paul Vossen introduced growers to olive production and marketing and offered citrus growers the opportunity to taste a variety of olives and olive oils.

“This is not a slam dunk, because this is a really peculiar crop that needs really specific things in order to flower and fruit,” Vossen said.

Olives thrive in a dry climate where it’s not too hot and not too cold. Vossen said rain during bloom season could wipe out the crop.

Ojai man appointed to Regional Water Quality Control Board
Ventura County Star

LA area olive farm produces oil for local markets

In the last two decades, artisanal olive oil production in California has surged as consumers have developed an appreciation for the freshness, high quality and distinctive flavors that good locally produced oil can provide, reported food writer David Karp in the Los Angeles Times.

The story focused on Joyce Lukon, who bought a lot with a view of Topanga Canyon as an investment and tried to make it more attractive for resale by planting grapes and olives. She took classes in the sensory analysis of olive oil taught at UC Davis by Paul Vossen, a Sonoma County farm advisor who has been a prime inspiration of the California artisanal olive oil boom, and he later visited several times to advise her.

Lukon now sells her 375-milliliter bottles of olive oil for $25 each at two farmers markets and online.

Debate over groundwater heats up
Tim Hearden, Capital Press

What to do about declining groundwater supplies was the subject tackled by 100 farmers, environmentalists and government officials during an all-day workshop offered by the University of California Cooperative Extension.

"We need to pay attention, we need to be educated and we need folks to talk to their local leaders and help them understand ... both sides of the issue," said Tehama County supervisor Bob Williams, who is an oat and alfalfa hay producer.

Midyear cuts will spare ag programs
Tim Hearden, Capital Press

The $1 billion in midyear state budget cuts announced by Gov. Jerry Brown won't directly affect agencies that assist farmers and ranchers.

The University of California system will use reserves to absorb its sudden $100 million hit, meaning local Cooperative Extension offices will be able to maintain their services, said Dianne Klein, a media specialist on the UC Office of the President communications staff.

"What the university intends to do, on a short-term basis, is draw upon reserves currently held to pay for unexpected cost in employee health and welfare plans," Klein said in an e-mail. "This, in essence, is a rainy day fund. We've declared a rainy day."

There may be other measures to cover the $100 million loss, but using the health plan fund "represents the lion's share of the cost," she said.

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