Classifications

• • A—HUMAN NECESSITIES
  • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
  • A23B—PRESERVATION OF FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES; CHEMICAL RIPENING OF FRUIT OR VEGETABLES
  • A23B20/00—Preservation of edible oils or fats
  • A23B20/30—Preservation of other edible oils or fats, e.g. shortenings or cooking oils
• • A—HUMAN NECESSITIES
  • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
  • A23B—PRESERVATION OF FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES; CHEMICAL RIPENING OF FRUIT OR VEGETABLES
  • A23B2/00—Preservation of foods or foodstuffs, in general
  • A23B2/05—Preservation of foods or foodstuffs, in general by heating using irradiation or electric treatment
• • A—HUMAN NECESSITIES
  • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
  • A23B—PRESERVATION OF FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES; CHEMICAL RIPENING OF FRUIT OR VEGETABLES
  • A23B2/00—Preservation of foods or foodstuffs, in general
  • A23B2/50—Preservation of foods or foodstuffs, in general by irradiation without heating
• • A—HUMAN NECESSITIES
  • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
  • A23B—PRESERVATION OF FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES; CHEMICAL RIPENING OF FRUIT OR VEGETABLES
  • A23B2/00—Preservation of foods or foodstuffs, in general
  • A23B2/50—Preservation of foods or foodstuffs, in general by irradiation without heating
  • A23B2/503—Preservation of foods or foodstuffs, in general by irradiation without heating with corpuscular or ionising radiation, i.e. X, alpha, beta or omega radiation
• • A—HUMAN NECESSITIES
  • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
  • A23D—EDIBLE OILS OR FATS, e.g. MARGARINES, SHORTENINGS OR COOKING OILS
  • A23D9/00—Other edible oils or fats, e.g. shortenings or cooking oils
  • A23D9/007—Other edible oils or fats, e.g. shortenings or cooking oils characterised by ingredients other than fatty acid triglycerides
• • A—HUMAN NECESSITIES
  • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
  • A23D—EDIBLE OILS OR FATS, e.g. MARGARINES, SHORTENINGS OR COOKING OILS
  • A23D9/00—Other edible oils or fats, e.g. shortenings or cooking oils
  • A23D9/02—Other edible oils or fats, e.g. shortenings or cooking oils characterised by the production or working-up
  • A23D9/04—Working-up
• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
  • C11B3/00—Refining fats or fatty oils
  • C11B3/005—Refining fats or fatty oils by wave energy or electric current, e.g. electrodialysis

Definitions

• the invention relates to a method of preparing an edible oil, in particular extra-virgin olive oil, which benefits of an increased shelf life, as well as the edible oil obtainable by the method of the invention.
• the European Regulation EU 432/2012 provides that polyphenols in extra-virgin olive oil contribute to the protection of blood lipids from oxidative stress.
• the EFSA European Food Safety Authority
• the method of the invention and the product thereof are therefore the result of a study conducted by the inventors, in order to identify new strategies to improve the bio-nutritional and health quality of olive oil over time, with particular reference to the special phenolic compounds of olive oil.
• the above-mentioned object is achieved by a method of preparing an edible oil, in particular olive oil, more in particular extra-virgin olive oil, which comprises the following steps:
• the whole olives having a polyphenolic content ranging from 1 to 5 % of polyphenols on the total weight of the olives, characterized in that the whole olives, before being introduced into the edible oil, are subjected to irradiation with ionizing radiations at an absorbed dose comprised within the range of from 2.5 to 15 kgray, even more preferably comprised within the range of from 2.5 to 5 kgray or lower.
• a particularly preferred absorbed dose is about 4.5 kgray.
• the European patent EP 2416664 B (Costa d'Oro S.p.A.) discloses a method of preparing an edible oil in which the whole olives, before being introduced into the edible oil, are subjected to a treatment with an anti-mould agent, after which they are subjected to a dehydration treatment such as to achieve the elimination of a quantity of water of between 7% and 15%.
• the international patent application WO 99/52377 A (UNILEVER NV (NL); UNILEVER PLC (GB)) 21 October 1999 (10.21.1999) discloses a method of increasing the polyphenol content in olive oil by immersing whole olives into olive oil.
• WO 99/52377 A also discloses that such a transfer of the ingredients of the olive fruit from the fruit to oil can be further increased by means of a dehydration treatment which can increase the transport of the olive fruit ingredients from the fruit to the oil.
• PANAGOU "Greek dry-salted olives: Monitoring the dry-salting process and subsequent physico-chemical and microbiological profile during storage under different packing conditions at 4 and 20°C”
• LWT - FOOD SCIENCE AND TECHNOLOGY discloses a method comprising the dehydration of olives up to the elimination of 21% water, followed by a treatment with potassium sorbate that increased the shelf life of the olives.
• the method according to the present invention advantageously allows increasing the final polyphenol content in the oil.
• the polyphenols contained in the olives are released over time within the volume of oil, playing the role of natural antioxidants.
• the irradiation with ionizing radiations is an extremely effective technology. Ionizing radiations are in fact able to destroy any bud, parasite, bacterium, virus or microorganism present in the olives which will subsequently be introduced into the edible oil. It has also been demonstrated that the irradiation with ionizing radiations does not cause the formation of toxic substances in processed foods. Consequently, the irradiation with ionizing radiations allows avoiding all the conventional treatments currently required for sterilization and microbiological safety.
• the irradiation with ionizing radiations is also an extremely simple technology: the olives to be irradiated are arranged on a conveyor belt and passed under a beam of radiation emitted by cobalt 60 or by an electron generator. In the latter case, these are radiations of very short wavelength (70nm) that break the DNA strands of organisms and microorganisms, whose replication is thus prevented.
• the edible oil obtained with the method of the invention is also characterized by a higher polyphenol content compared to the same oil treated with the method disclosed in European patent EP 2416664 B of the prior art.
• An improvement in the state of preservation is also noted, measurable with the conventional parameters used for this purpose, i.e. the number of peroxides and the U.V. K232 and K270 spectrophotometric indices.
• the organoleptic characteristics of the edible oil remain substantially stable over time or with a sensory score perceptibly better when examined by a Panel.
• the invention also relates to the edible oil, in particular the extra- virgin olive oil, obtainable with the method of the invention, whose features are illustrated in detail in the example section.
• green olives before the onset of ripening are used, namely olives which have not yet reached the stage of complete ripening of the fruits, in which the epicarp color changes from a deep green color typical of olives not yet ripe, to a final color which can vary, depending on the cultivar, from red purple to black.
• the use of olives before the onset of ripening is preferable as they contain a higher amount of polyphenols compared to ripe olives and are therefore able to perform the best antioxidant function, in addition to providing a final product characterized by an improved visual appearance.
• the olives inserted into the edible oil belong to the Coratina cultivar, which among Italian cultivars is the richest in polyphenols.
• the method involves the use of a number of olives of from 1 to 4 per 1 litre of oil.
• the olives used in the method of the invention have a caliber of 20- 22, expressed as the number of olives per 100 grams.
• Such a caliber has proved particularly suitable for use in technological automation processes for the insertion of the olives into the oil container, such as a bottle for oil having a neck diameter of about 35 mm.
• Example 1 microbiological analyses Samples of Coratina olives were subjected to a treatment according to the prior art (referred to as “treatment 1 ”) and to the treatment according to the present invention (referred to as “treatment 2").
• Treatment 1 the olives were subjected to partial dehydration in a stove at 120 °C to remove 10% of water from the fruits.
• Treatment 2 the olives were subjected to irradiation with ionizing radiations at an absorbed dose of 4.5 kgray.
• Table 1A below shows the values of the microbiological parameters measured in the olives subjected to treatment 1 and in the preserving oil thereof, at time zero, after 6 months and after 1 year from the insertion of the olives into the oil.
• Treatment 2 Preserving oil t. t. t. t. t. t. t. zero 6 12 zero 6 12 months months months months pH (4.4 max) 4.23 4.23 4.28 - - -
• Example 2 analysis of the release of antioxidants and evaluation of the shelf life effect and of the organoleptic characteristics of the oil
• treatment 2 control tests of the main physical-chemical parameters of the same extra-virgin olive oil were carried out, with the addition of whole olives treated with the method of the present invention ("treatment 2") or with the prior art method referred to as "treatment 1".
• the olive subjected to treatment 1 is able to improve the oil storage conditions to which it is added, compared to oil as such. This is determined by the partial release of the polyphenols contained in olive oil into the oil. Polyphenols are in fact strong antioxidants.
• the olive subjected to treatment 2 is able to improve the oil storage conditions to which it is added, both as compared to oil as such and as compared to the oil samples containing the olive subjected to treatment 1. This is determined by the fact that the olive is able to release into the oil a greater amount of polyphenols compared to the olive subjected to treatment 1. Therefore, the olive treated with ionizing radiations according to the present invention has an even more effective and ameliorative effect on the oil shelf life, compared to the olive treated by partial dehydration according to the prior art.
• Example 3 Example 3:
• the European Regulation EU 432/2012 states that the indication of the beneficial health effect of polyphenols can be put on the label only if the product contains at least 250 mg/kg of hydroxytyrosol and derivatives thereof (e.g. oleuropein and tyrosol; lignans should be excluded from total biophenols).
• the indication must be accompanied by the information to the consumer that "the beneficial effect is obtained with a daily intake of 20 g of olive oil”.
• the process according to the present invention provides extremely advantageous characteristics to the edible oil, in particular olive oil, more in particular extra- virgin olive oil, mainly a higher content in polyphenols which increase the beneficial bio-nutritional and health effects thereof.

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• Chemical & Material Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Food Science & Technology (AREA)
• Polymers & Plastics (AREA)
• Wood Science & Technology (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Zoology (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Organic Chemistry (AREA)
• Microbiology (AREA)
• Electrochemistry (AREA)
• Edible Oils And Fats (AREA)
• Fats And Perfumes (AREA)
• Physics & Mathematics (AREA)
• Health & Medical Sciences (AREA)
• Optics & Photonics (AREA)
• Plasma & Fusion (AREA)
• Toxicology (AREA)
• Biochemistry (AREA)

Priority Applications (9)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

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Cited By (1)

Citations (2)

Family Cites Families (4)

• 2016
  • 2016-07-26 IT IT102016000078129A patent/IT201600078129A1/it unknown
• 2017
  • 2017-07-24 AU AU2017304876A patent/AU2017304876B2/en not_active Ceased
  • 2017-07-24 BR BR112019001550A patent/BR112019001550A2/pt not_active Application Discontinuation
  • 2017-07-24 KR KR1020197003614A patent/KR20190043529A/ko not_active Ceased
  • 2017-07-24 MX MX2019001133A patent/MX2019001133A/es unknown
  • 2017-07-24 CN CN201780046778.8A patent/CN109688826A/zh active Pending
  • 2017-07-24 RU RU2019102622A patent/RU2746564C2/ru active
  • 2017-07-24 JP JP2019504830A patent/JP2019523007A/ja active Pending
  • 2017-07-24 CA CA3031599A patent/CA3031599A1/en not_active Abandoned
  • 2017-07-24 WO PCT/IB2017/054461 patent/WO2018020388A1/en not_active Ceased
  • 2017-07-25 TW TW106124849A patent/TW201803459A/zh unknown
• 2019
  • 2019-01-23 IL IL264432A patent/IL264432A/en unknown

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Non-Patent Citations (1)

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