Archives for posts with tag: Apple

Welcome back to our Mycotoxin Series!

Patulin wouldn’t be the first mycotoxin I’d typically introduce, but it has been in the news recently.  Patulin is produced by species of Penicillium, Aspergillus and Byssochlamys, which are filamentous fungi or “molds”.  Patulin can be found contaminating products like fruit, grains and cheese; however, apple juice is of most concern.  And let’s be real, it’s the bruised, damaged and misshapen apples that go into juice (blemish-free are reserved for fresh market’s picky consumers).  However, apples with rot (see below) should NOT go into juice or cider production due to patulin concerns.

apple with Penicillium expansum

Apple infested with Penicillium expansum, a patulin producer.
[NOTE: The blue-gray growth is the fungus. Patulin (waaaaay too small to be seen by the human eye!) is produced by the fungus and spreads into the rotten apple.]

Photo: Puel et al. 2010. Toxins (Basel). 2(4): 613–631.

In April 2013, Winn Dixie brand apple juice was voluntarily recalled due to patulin levels over 50 parts per billion (ppb).  In June 2013, researchers from the University of Granada reported that more than 50% of commercial apple juices tested contained >50 ppb patulin (50 ppb is the “limit” for patulin in both the US and EU).

Healthy apples

Healthy apples

Patulin in apple juice is of particular concern as this product is frequently served to young children.  In fact, some of the commercial juices tested in the aforementioned study were specifically produced and marketed to children. This toxin is a suspected carcinogen and symptoms of a patulin mycotoxicosis (poisoning) are gastro-intestinal inflammation and ulcers, weight loss, swelling, convulsions and impaired immune response (source).

While I’m not a medical doctor or veterinarian, eliminating the contaminated product from one’s diet often alleviates the symptoms.  However, acute mycotoxin poisonings are rare in the US (especially for humans).  Chronic exposure to low levels of mycotoxins is much more concerning and is difficult to study.  Hopefully, juice producers will step up their mycotoxin testing protocols to reduce the levels of patulin on the grocery shelves.

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Am I the only sucker for a top 10 list?  Or any list for that matter?  Best beaches, worst dressed, most influential, least popular??  Give me a superlative and a topic and consider me “most likely” to click on it!

Top popular science stories of the week will be a regular feature on the blog every Friday.  These are my top stories; the ones that were fascinating to me as a science enthusiast.  You may or may not agree that these were most interesting or ground-breaking.  Either way, I’d love to hear what you’ve been reading this past week!

Here they are (in no particular order):

1. Open Ag Data

The G-8 Open Data for Agriculture Conference was held last week in Washington DC.  The “open data” concept is just what it sounds like: making data freely available for scientists (or anyone, for that matter) to use.  The idea may be a little unnerving for researchers who historically are tight-lipped about their hypothesis, methods and results lest an unscrupulous competitor “steal” their ideas.  However, those of us who work in agriculture ultimately have the same goals: to provide safe and sustainable food for the world.  Having a bank of accessible data would open the doors for collaboration and innovation and makes the original research dollars stretch even further by providing more options for previously published (and potentially unpublished) data.

2. NYT covers citrus greening

I will never be able to pass up a mainstream media plant pathology story.  Citrus greening (Huanglongbing) is a destructive bacterial disease of citrus trees and has been present in Florida since at least 2005. The bacteria, Candidatus Liberibacter asiaticus, are disseminated by a tiny insect called the Asian citrus pysllid.  The article highlights some of the challenges growers are facing such as the lack of successful treatments and the impact of abandoned citrus groves (and potentially, homeowners’ backyard trees) as sinks for the insect and bacteria.  Fortunately research dollars have been ear-marked for this disease, but is the impact on Florida’s citrus industry already too great?

Citrus greening symptoms and vector_via APSnet(Image: Via APSnet.org, Tim R. Gottwald and Steve M. Garnsey, USDA, ARS, U.S.)

3.  Turning back the clock for heart tissue (video)

I’m sure most of us have been affected by heart disease in one way or another.  In age-related heart disease, there is a general decline in function as the muscle itself hardens and grows in size (myocardial hypertrophy).  Researchers from Harvard studying age-related heart disease focused their efforts on a hormone called GDF-11, which declines with age.  Surprisingly, when old mice were given doses of GDF-11 comparable to levels found naturally in young mice, old hearts returned to the size of young hearts within a matter of weeks.  This research can be found in the recent issue of Cell.

Mouse heart1_Via CBS Mouse heart2_Via CBS(Image: CBS News)

 4. Cost and profitability of organic apple production

Demand for organic produce, has skyrocketed in recent years.  As stated in this Plant Management Network article, organic apples have gone from a specialty crop to a true commodity with demand rivaling that of conventional produce.  This study compared production costs and yield in organic and conventional apple orchards in the state of Washington.  Organic management costs 5-10% more on average per acre and yields slightly less than conventional methods.  If customers remain willing to pay a premium price, organic production can be profitable for the grower.  However, in a “bad year” (i.e. heavy disease, pests or incompatible weather) both management practices may fail profit.  Ah, such is agriculture…

 

What have you been reading this week?