Isolation and some properties of plastochromanol‐8

Olejnik, D.; Gogolewski, M.; Nogala‐Kałucka, Małgorzata

doi:10.1002/food.19970410209

Cited by 66 publications

(52 citation statements)

References 6 publications

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“…These values are close to results of Olejnik et al 40 and Obranović et al 9 , but a four-fold higher than in the work Choo et al 5 . Such big variations in content of all tocols could be the result of different harvesting locations and varieties, extraction technologies or storage time of flaxseed oil 5, 9, 37 .…”

Section: Content Of Bioactive Compounds In Fresh Axseed Oilssupporting

confidence: 74%

“…In turn, α-tocopherol has strong antioxidant activity in the human body, while the activity of β, γ and Δ homologues is limited because they are immediately metabolized in the liver and excreted in the bile or urine 44 . However, it was shown that plastochromanol-8 has activity even 1.5 times greater than α-tocopherol 40 .…”

Section: Content Of Bioactive Compounds In Fresh Axseed Oilsmentioning

confidence: 99%

See 1 more Smart Citation

Commercial Cold Pressed Flaxseed Oils Quality and Oxidative Stability at the Beginning and the End of Their Shelf Life

et al. 2016

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Section: Content Of Bioactive Compounds In Fresh Axseed Oilssupporting

confidence: 74%

Section: Content Of Bioactive Compounds In Fresh Axseed Oilsmentioning

confidence: 99%

Commercial Cold Pressed Flaxseed Oils Quality and Oxidative Stability at the Beginning and the End of Their Shelf Life

et al. 2016

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“…Compared with vte2 vte1, the presence of PC-8 in vte2-1 prevented lipid oxidation during seed desiccation (15)(16)(17)(18)(19)(20) and early quiescence (20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30). Lipid oxidation is enhanced in vte2-1 seed (and seedlings derived thereof) only after extended quiescence (60 DAP; Figs.…”

Section: Discussionmentioning

confidence: 99%

“…Whereas the properties and functions of tocopherols and tocotrienols are widely described in plants, cyanobacteria, and animals (22-24) just a single report has shown that PC-8 is a lipidsoluble antioxidant in vitro (25), and there are no data describing PC-8 function in vivo. To assess PC-8 function in vivo, we generated an Arabidopsis vte2 vte1 genotype.…”

Section: Discussionmentioning

confidence: 99%

Plastochromanol-8 and tocopherols are essential lipid-soluble antioxidants during seed desiccation and quiescence in Arabidopsis

Mène-Saffrané¹,

Jones

DellaPenna³

2010

Proc. Natl. Acad. Sci. U.S.A.

126

102

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Given their essential role as vitamin E, tocopherols and tocotrienols have been studied extensively in animals and plants. In contrast, our understanding of the function of plastochromanol-8 (PC-8), a third type of tocochromanol with a longer side chain, is very limited despite the wide distribution of PC-8 in the plant kingdom, including species consumed by humans. To investigate PC-8 function in vivo, we combined the Arabidopsis vte1 mutation that eliminates tocopherols and PC-8 and causes the accumulation of 2,3-dimethyl-6-phytyl-1,4-benzoquinol (DMPBQ), a redox-active tocopherol precursor, and the vte2 mutation that eliminates tocopherols without affecting PC-8. The vte2 vte1 double mutant lacks tocopherols, PC-8, and DMPBQ, and exhibits the most severe physiological and biochemical phenotypes of any tocochromanol-affected genotype isolated to date, most notably a severe seedling developmental phenotype associated with massive lipid oxidation initiated during seed desiccation and amplified during seed quiescence. In contrast, the presence of PC-8 in vte2 suppresses or attenuates all of the developmental and biochemical phenotypes observed in vte2 vte1, demonstrating that PC-8 is a lipid antioxidant in vivo. Finally, the low relative fitness of vte2 vte1 demonstrates that tocopherols and PC-8 are in vivo lipid antioxidants essential for seed plant survival.eed-bearing plants (spermatophytes) first appeared in the fossil record during the late Devonian period (about 370 mya) and represent 90% of the extant terrestrial flora (1). One of the key innovations for this evolutionary success is the capacity of seed to maintain a viable desiccated embryo for extended periods (quiescence), thereby allowing seed plants to occupy ecosystems experiencing temporary nonpermissive growth conditions (e.g., drought, frost). Extreme examples of the ability of seed to preserve plant genetic resources are demonstrated by the germination and development of plants from 2,000-y-old date seed, 1,300-y-old lotus seed, and 600-y-old canna seed (2). More commonly, seed viability gradually decreases during quiescence as a function of storage conditions (e.g., temperature, humidity, oxygen) and initial seed quality (e.g., moisture, pathogens) (3).Genetic factors underlying seed longevity have been studied only recently (reviewed in ref. 2). Protein repair and folding during seed development, maturation, and storage have been shown to be important factors affecting seed longevity. Overexpression of L-isoaspartyl O-methyltransferase 1, an enzyme that repairs damaged aspartate residues in proteins, reduced seed protein L-isoaspartyl levels, and enhanced germination compared with WT in accelerated aging tests, which subject dry seed to heat and high humidity (4). Similarly, overexpression of the heat stress transcription factor HaHSFA9 increased several heat-shock proteins in seed and improved resistance to accelerated aging treatments (5). Proper development and maturation of the seed coat (testa) also impacts seed longevity. For example, Ar...

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“…Plastochromanol-8 is considered to be a natural γ-T3 homologue, the only difference being that it has a longer side chain . According to Olejnik et al (1997), the antioxidant properties of PC-8 are 1.5 times greater than those of α-T. Plant sterols form the majority of the unsaponifiable components of most plant oils. The overall quantity of sterols in '00' rapeseed oil varies between 0.45% and 1.13%.…”

Section: Introductionmentioning

confidence: 99%

Cold-pressed and hot-pressed rapeseed oil: The effects of roasting and seed moisture on the antioxi- dant activity, canolol, and tocopherol level

Siger

Józefiak

Górnaś

2017

Acta Sci Pol Technol Aliment

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Background. The paper looks at the levels of canolol, tocopherols and antioxidant activity in cold-pressed and hot-pressed rapeseed oils produced from seeds of various moisture levels (5%, 7.5%, and 10%). The paper also considers the effects of seed roasting on the levels of these compounds. Material and methods. The material used for the tests was rapeseed cv. Adrianna. The quality of the oils obtained is determined using peroxide and acid values. The levels of canolol and tocopherols are analyzed using HPLC. The DPPH radical-scavenging activity method for oil samples and phenolic extract from oils was used.Results. It has been demonstrated that the oils produced from rapeseeds with a 5% moisture content, and in particular from cold-pressed oils, were characterized by the lowest peroxide values. Cold-pressed oils produced from rapeseeds with a 5% moisture content were characterized by higher levels of tocopherols and plastochromanol-8. In the case of hot-pressed oils, the highest levels of tocopherols were found in oils produced from seeds with a 7.5% moisture content, and the greatest amount of PC-8 (more than 4 mg/100 g) was found in oils produced from seeds with a 10% moisture content. Hot-pressed oils have been shown to have higher levels of these compounds than cold-pressed oils. Both roasting and hot pressing led to an increase in the amount of canolol in the oils investigated. When analysing the antioxidant activity of the oils and phenolic extracts it was shown that phenolic compounds are responsible for approx. 10% of total antioxidant activity. Conclusion. Various levels of biologically active compounds were shown to be present in the rapeseed oil obtained from raw materials of a varying moisture content. The type of pressing process (cold-pressing or hot-pressing) and whether the seeds have undergone roasting has also been shown to affect the resulting oil and the level of native antioxidants it contains.

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Isolation and some properties of plastochromanol‐8

Cited by 66 publications

References 6 publications

Commercial Cold Pressed Flaxseed Oils Quality and Oxidative Stability at the Beginning and the End of Their Shelf Life

Commercial Cold Pressed Flaxseed Oils Quality and Oxidative Stability at the Beginning and the End of Their Shelf Life

Plastochromanol-8 and tocopherols are essential lipid-soluble antioxidants during seed desiccation and quiescence in Arabidopsis

Cold-pressed and hot-pressed rapeseed oil: The effects of roasting and seed moisture on the antioxi- dant activity, canolol, and tocopherol level

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