- Crop Farm Manager Sharjah
- Commercial Manager Soft Fruits
- Senior Commercial Manager
- Assistant Nursery Manager - Tasmania, Australia
- Tissue Culture Lab / Operations Manager - Victoria, Australia
- Irrigation Manager - Tasmania or Victoria
- Chief Executive Officer Hortifrut IG Berries
- Head of Operations - Dubai, United Arab Emirates
- Greenhouse grower / production manager - Brazil
- Experienced International Trade Specialist
Top 5 -yesterday
- Freight rates will drop by 20-30% in the second half of the year
- T&G takes big step towards low carbon future with Sustainability-Linked Loan
- 2022 NZ kiwifruit harvest complete
- Maersk: No abatement in surging costs of shipping goods
- Australian almond harvest in danger as varroa mite is detected at Newcastle port
Top 5 -last week
Top 5 -last month
- How a safari camp in the heart of Kenya’s Masai Mara is harvesting 200kg monthly
- A very crowded European avocado market
- "We have lost 80% of our stone fruit production this year"
- "The soil of Zimbabwe seems to be magical for blueberries”
- San Miguel sells fresh fruit operations in Peru and South Africa to Citri&Co
Health promoting compounds in local onions from Italy and Ukraine
Phenolics and alk(en)yl cysteine sulfoxides (ACSO) are the two main groups of onion putative health promoting compounds. Phenolics are present in two subgroups: anthocyanins (responsible for the red colour of some varieties) and flavonols (such as quercetin and, to lesser extent, isorhamnetin glucosides) responsible for the yellow and brown skin of other varieties. ACSO are organosulphur compounds which, under the action of enzyme allinase following tissue cutting and damaging, generate a group of intermediates, sulphenic acids, which are very unstable and undergo condensation to form thiosulphinates, the primary flavour and odour compounds in Allium species.
Italian scientists at University of Bologna conducted a research aimed at comparatively characterizing local onion varieties of different traditional food crops. The study focused on a preliminary qualitative and quantitative characterization by HPLC and spectrophotometric assays of phenolics and ACSO, and antioxidant activity in a number of locally sampled bulb onions, potato onions and shallots from Italy and Ukraine.
Fifteen phenolic compounds, belonging to flavonols and anthocyanins, and two cysteine sulfoxides, methiin and isoalliin, were quantified.
Total phenolics and cysteine sulfoxides were in the range 2595 – 9840 and 6777 – 18,916 mg kg-1 dry matter respectively. On average, potato onion phenolic content was 55 and 59% higher than in bulb onion and shallot accessions respectively. Bulb and potato onions showed a similar cysteine sulfoxide content, whereas in shallots sulfoxide level was about 17% lower. Flavonols were related to antioxidant capacity in both low and high anthocyanin types; however anthocyanins gave a prominent contribution to total antioxidant capacity in red onions.
Scientists concluded that in general, qualitative analytical differences were not detected among the three groups, however quantitative variation of some components allowed a rather clear discrimination.
High variability was detected within each group, showing the possibility of selection for both low or high content of specific components, impacting sensory and health promoting properties or simply characterizing local specific landraces. The establishment of relationships between composition and functional properties of specific components could represent a next characterizing phase of similar investigations.
Study is available online from June 3rd 2015 at:
Source: Ferioli F., D’Antuono L.F., ‘Evaluation of phenolics and cysteine sulfoxides in local onion and shallot germplasm from Italy and Ukraine’, 2015, Genetic Resources and Crop Evolution, DOI 10.1007/s10722-015-0270-2.
Department of Agri-Food Science and Technology, University of Bologna, Food Science University Campus
Piazza Goidanich 60
47521 Cesena, FC, Italy
Receive the daily newsletter in your email for free | Click here
Other news in this sector:
- 2015-09-30 Nicaragua imports onions to stabilize prices
- 2015-09-22 All onion eyes on Victoria in October
- 2015-09-21 Egypt: Onion exports 19% up in first five months of 2015
- 2015-09-17 New season Queensland onions on shelves by October
- 2015-09-15 The onion market is like the AEX, with the right mood, it goes well
- 2015-09-15 Onion prices in the EU significantly higher than last year
- 2015-09-14 High export demand contributes to strong onion market
- 2015-09-10 California onion season winds down, Northwest ramps up
- 2015-09-09 "Onion sector to take technological turn over next few years"
- 2015-09-01 Health promoting compounds in local onions from Italy and Ukraine
- 2014-09-30 Panama could restrict imports of onions at harvest time
- 2014-09-30 Argentina: The area planted with garlic in Mendoza increased by 28%
- 2014-09-29 Gordon Ramsay uses massive Leicestershire onion to create an eye-watering dish
- 2014-09-25 Out with the old and in with the new season, fresh & mild Queensland onions
- 2014-09-22 New World’s Biggest Onion is an eye-watering sight
- 2014-09-19 Which way is the onion market going?
- 2014-09-18 Italy: Short day onions - good perspectives for the ongoing campaign
- 2014-09-16 Spain: Onion prices at origin drop as low as 5 cents per kilo
- 2014-09-15 Spain: Oversupply drives onion prices down 25%
- 2014-09-10 Tabaski festival will provide the necessary orders for onions