Polyphenols from Allanblackia floribunda seeds: Identification, quantification and antioxidant activity

Akpanika, Grace A.; Winters, A. L.; Wilson, Thomas; Ayoola, Gloria A.; Adepoju-Bello, A A; Hauck, Barbara

doi:10.1016/j.foodchem.2016.12.002

Cited by 15 publications

(8 citation statements)

References 30 publications

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“…MS 2 fragmentation products in negative mode included ions with m / z 719 and 557, corresponding to the neutral loss of two hexose sugars (Vukics & Guttman, 2010). MS n analysis of the aglycone yielded product ions similar to those reported for Gb‐2a (naringenin‐I,3‐II,8‐eriodictyol; Akpanika et al, 2017). However, as there were small differences in some of the low abundance, characteristic fragments, we tentatively identify this compound as a flavanone dimer.…”

Section: Resultssupporting

confidence: 64%

Allelopathic and intraspecific growth competition effects establishment of direct sown Miscanthus

et al. 2020

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High yielding perennial crops are being developed as a sustainable feedstock for renewable energy and bioproducts. Miscanthus is a leading biomass crop, but most plantations comprise a sterile hybrid Miscanthus × giganteus that is clonally propagated. To develop new varieties across large areas, rhizome cloning is inefficient, time consuming and expensive. Alternative approaches use seed, and in temperate regions, this has been successfully applied by raising seedlings as plug plants in glasshouses before transfer to the field. Direct sowing has yet to be proven commercially viable because poor germination has resulted in inconsistent stand establishment. Oversowing using seed clusters is a common approach to improve the establishment of crops and it was hypothesized that such an approach will improve uniformity of density in early Miscanthus stands and thereby improve yield. Sowing multiple seeds creates potential for new interactions, and we identified at least two inhibitory mechanisms related to seed numbers. Germinating seed produced allelopathic effects on nearby seed thereby inhibiting plant growth. The inhibitory effect of Miscanthus seed on germination percentages was related to seed number within clusters. An extract from germinating Miscanthus seed inhibited the germination of Miscanthus seed. The extract was analysed by HPLC, which identified a complex mixture including several known allelopathic compounds including proanthocyanidins and vanillic acid. There was also evidence of root competition in soil in a controlled environment experiment. When the experiment on competition was replicated at field scale, the establishment rates were much lower and there was evidence of shoot competition. We conclude that the numbers of seed required to ensure an acceptable level of establishment in the field may be economically impractical until other agronomic techniques are included either to reduce the inhibitory effects of higher seed numbers or to reduce oversowing rates. K E Y W O R D S agronomy, allelochemical, allelopathic, direct sowing, establishment, Miscanthus, Miscanthus sinensis, oversowing, seed biology, seed germination How to cite this article: Awty-Carroll D, Hauck B, Clifton-Brown J, Robson P. Allelopathic and intraspecific growth competition effects establishment of direct sown Miscanthus. GCB Bioenergy.

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Section: Resultssupporting

confidence: 64%

Allelopathic and intraspecific growth competition effects establishment of direct sown Miscanthus

et al. 2020

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“…The [52,53]. This compound was also reported in other studies investigating phenolic compounds in Cucumis melo [42,46].…”

Section: Plos Onesupporting

confidence: 62%

Effect of pulsed light on postharvest disease control-related metabolomic variation in melon (Cucumis melo) artificially inoculated with Fusarium pallidoroseum

et al. 2020

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Pulsed light, as a postharvest technology, is an alternative to traditional fungicides, and can be used on a wide variety of fruit and vegetables for sanitization or pathogen control. In addition to these applications, other effects also are detected in vegetal cells, including changes in metabolism and secondary metabolite production, which directly affect disease control response mechanisms. This study aimed to evaluate pulsed ultraviolet light in controlling postharvest rot, caused by Fusarium pallidoroseum in 'Spanish' melon, in natura, and its implications in disease control as a function of metabolomic variation to fungicidal or fungistatic effects. The dose of pulsed light (PL) that inhibited F. pallidoroseum growth in melons (Cucumis melo var. Spanish) was 9 KJ m-2. Ultra-performance liquid chromatography (UPLC) coupled to a quadrupole-time-of-flight (QTOF) mass analyzer identified 12 compounds based on tandem mass spectrometry (MS/MS) fragmentation patterns. Chemometric analysis by Principal Components Analysis (PCA) and Orthogonal Partial Least Squared Discriminant Analysis (OPLS-DA) and corresponding S-Plot were used to evaluate the changes in fruit metabolism. PL technology provided protection against postharvest disease in melons, directly inhibiting the growth of F. pallidoroseum through the upregulation of specific fruit biomarkers such as pipecolic acid (11), saponarin (7), and orientin (3), which acted as major markers for the defense system against pathogens. PL can thus be proposed as a postharvest technology to prevent chemical fungicides and may be applied to reduce the decay of melon quality during its export and storage.

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“…In peak 12 (t r = 6.62 min) the ion m/z 271.0605 [M-H] - was observed with a fragmentation pattern in MS/MS showing the loss of ring B at m/z 177.0180 and by Retro Diels-Alder at m/z 151.0026 and m/z 119.0489. Thus, it was tentatively identified as flavanone naringenin [35, 36].…”

Section: Resultsmentioning

confidence: 99%

Effect of pulsed light on postharvest disease control-related metabolomic variation in melon (Cucumis melo) artificially inoculated with Fusarium pallidoroseum

Filho

Silva

Lopes

et al. 2019

Preprint

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AbstractPulsed light, as a postharvest technology, is an alternative to traditional fungicides, and can be used on a wide variety of fruit and vegetables for sanitization or pathogen control. In addition to these applications, other effects also are detected in vegetal cells, including changes in metabolism and production of secondary metabolites, which directly affect disease control response mechanisms. This study aimed to evaluate the possible applications of pulsed ultraviolet light in controlling postharvest rot, mainly caused by Fusarium pallidoroseum in yellow melon ‘Goldex’, in natura, and its implications in the disease control as a function of metabolomic expression to effect fungicidal or fungistatic. The dose of pulsed light (PL) that inhibited F. pallidoroseum growth in melons (Cucumis melo var. Spanish) was 9 KJ m-2. Ultra performance liquid chromatography (UPLC) coupled to a quadrupole time-of-flight (QTOF) mass analyzer identified 12 compounds based on the MS/MS fragmentation patterns. Chemometric analysis by Principal Components Analysis (PCA) and Orthogonal Partial Least Squared Discriminant Analysis (OPLS-DA and S-plot) were used to evaluate the changes in fruit metabolism. PL technology provided protection against postharvest disease in melons, directly inhibiting the growth of F. pallidoroseum through upregulation of specific fruit biomarkers such as pipecolic acid (11), saponarin (7), and orientin (3), which acted as major markers for the defense system against pathogens. PL can thus be proposed as a postharvest technology to avoid chemical fungicides and may be applied to reduce the decay of melon quality during its export and storage.

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Polyphenols from Allanblackia floribunda seeds: Identification, quantification and antioxidant activity

Cited by 15 publications

References 30 publications

Allelopathic and intraspecific growth competition effects establishment of direct sown Miscanthus

Allelopathic and intraspecific growth competition effects establishment of direct sown Miscanthus

Effect of pulsed light on postharvest disease control-related metabolomic variation in melon (Cucumis melo) artificially inoculated with Fusarium pallidoroseum

Effect of pulsed light on postharvest disease control-related metabolomic variation in melon (Cucumis melo) artificially inoculated with Fusarium pallidoroseum

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