Irish potato, one of the world's major food crops, is increasingly grown and processed for use in various products; consider the popularity of consumer favorites like French fries and potato chips.
In the closely scrutinized food production industry, products are accepted or rejected on the basis of color and appearance, among other attributes. Quality defects such as after-cooking darkening, or ACD—a change in potato's normal flesh color to gray, blue, purple, or black—can affect the marketability of potatoes for both processing and fresh markets. With the current expansion of the potato-processing industry around the world comes a renewed interest in finding innovative methods to prevent ACD.
After-cooking darkening occurs when potatoes are exposed to air after cooking, including boiling, baking, frying, or dehydration. ACD has been reported from every potato-growing area in the world and is one of the most widespread, undesirable traits for potatoes and other tubers, even though it does not affect the flavor or nutritional value of the crops. ACD is most common in boiled or steamed potatoes, but is also problematic in processed products such as oil-blanched French fries, dehydrated potatoes, canned potatoes, prepeeled potatoes, and reconstituted dehydrated potatoes.
Researchers at Nova Scotia Agricultural College hypothesized that the concentration and distribution of elements in potato tubers could be used to predict after-cooking darkening. The objective of the study, published in a recent issue of HortScience, was to identify the elements (plant nutrients) whose content may relate to the severity of potato ACD. The researchers grew two common potato cultivars ('Shepody' and 'Russet Burbank') in three Eastern Canadian provinces for two seasons using various fertilization regimes. Fourteen elements were studied: phosphorus, calcium, magnesium, potassium, sulfur, iron, copper, sodium, zinc, boron, manganese, aluminum, silicon, and chlorine.
The "After Cooking Darkening" readings were found to be affected by fertilizer and a "cultivar–segment interaction". ACD readings were higher in tubers from fertilized plots compared with tubers from nonfertilized plots. The distribution of ACD was found to be similar in both cultivars studied, with the stem end being the darkest, the center segment being the lightest, and the flesh darkening again slightly toward the bud end. The elements most strongly correlated with ACD severity were phosphorus, calcium, copper, and magnesium. According to the researchers, the study provides a useful method to predict the severity of ACD, which could assist the potato processing industry in predicting the occurrence of ACD and in developing agronomic treatments to minimize it.
"This study demonstrated how information from element distribution can be used in predicting the occurrence of a tuber quality trait, specifically ACD", commented Dr. Gefu Wang-Pruski, corresponding author of the study.
The authors note that additional experiments to determine how tuber element content affects the change in ACD severity over time may make it possible to predict the severity of ACD in tubers in late stages of storage by determining the element concentrations and their spatial distribution of the same lot of tubers at harvest.
The complete study and abstract are available on the ASHS HortScience electronic journal web site: http://hortsci.ashspublications.org/cgi/content/abstract/44/7/1866
Founded in 1903, the American Society for Horticultural Science (ASHS) is the largest organization dedicated to advancing all facets of horticultural research, education, and application. More information at ashs.org
Michael W. Neff | EurekAlert!
Ammonium nitrogen input increases the synthesis of anticarcinogenic compounds in broccoli
26.04.2017 | University of the Basque Country
New data unearths pesticide peril in beehives
21.04.2017 | Cornell University
More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.
Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...
Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.
"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...
The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.
Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...
The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...
Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.
Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...
28.04.2017 | Event News
20.04.2017 | Event News
18.04.2017 | Event News
28.04.2017 | Medical Engineering
28.04.2017 | Earth Sciences
28.04.2017 | Life Sciences