Influence of the Extraction Conditions on the Antifungal Properties of Walnut Green Husk Isolates

Wianowska, Dorota; Garbaczewska, S.; Cieniecka‐Rosłonkiewicz, Anna; Dawidowicz, Andrzej L.; Typek, Rafał; Kiełczewska, Anna

doi:10.1080/00032719.2020.1725889

Cited by 10 publications

(13 citation statements)

References 21 publications

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“…The determination was made in accordance with [21]. To prepare the cationic radical ABTS (ABTS •+ ), 5 mL of a 7 mM aqueous ABTS solution was mixed with 88 mL of 140 mM potassium persulfate (K 2 S 2 O 8 ).…”

Section: Abts Methodsmentioning

confidence: 99%

A Central Composite Design in increasing the quercetin content in the aqueous onion waste isolates with antifungal and antioxidant properties

Wianowska

Olszowy

Garbaczewska

2021

Eur Food Res Technol

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In this study, to increase the content of quercetin in the isolates obtained from the white and red onion scales, in accordance with the zero waste philosophy, using water as an environmentally and healthy friendly extractant, a mathematical model was constructed, based on the Central Composite Design. The suitability of the model for the accurate and quick study of complex relationships was demonstrated by obtaining a statistically insignificant difference in the yield predicted by the model and that determined experimentally under optimal extraction conditions, i.e., 44.14 mg/g (33.57 mg/g) and 45.54 mg/g (33.31 mg/g) for white (red) onion scales, respectively. To present the obtained isolates applicability, their biological activity was assessed in terms of antioxidant activity and antifungal activity against various fungi, showing properties that are sufficient to encourage the use of this material, previously treated as worthless waste, for the production of various functional ingredients, including functional food additives. Moreover, they can be also used to produce safe and effective protectants meeting the GRAS criteria.

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Section: Abts Methodsmentioning

confidence: 99%

A Central Composite Design in increasing the quercetin content in the aqueous onion waste isolates with antifungal and antioxidant properties

Wianowska

Olszowy

Garbaczewska

2021

Eur Food Res Technol

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“…Hill and L.A.S. Johnson) [16], essential oils of Moroccan wormseed (Dysphania ambrosioides (L.) Mosyakin and Clemants) [17], walnut (Juglans regia L.) green husk extracts [18], extracts from buckwheat grain and hulls [19], phenolic-rich bee products (propolis, bread and pollen) [19], or polyphenol inclusion compounds and conjugate complexes [20,21], among others, have been recently reported.…”

Section: Of 16mentioning

confidence: 99%

Antifungal Activity of Chitosan Oligomers–Amino Acid Conjugate Complexes against Fusarium culmorum in Spelt (Triticum spelta L.)

et al. 2020

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Fusarium head blight (FHB) is a complex disease of cereals caused by Fusarium species, which causes severe damages in terms of yield quality and quantity worldwide, and which produces mycotoxin contamination, posing a serious threat to public health. In the study presented herein, the antifungal activity against Fusarium culmorum of chitosan oligomers (COS)–amino acid conjugate complexes was investigated both in vitro and in vivo. The amino acids assayed were cysteine, glycine, proline and tyrosine. In vitro tests showed an enhancement of mycelial growth inhibition, with EC50 and EC90 effective concentration values ranging from 320 to 948 µg·mL−1 and from 1107 to 1407 µg·mL−1 respectively, for the conjugate complexes, as a result of the synergistic behavior between COS and the amino acids, tentatively ascribed to enhanced cell membrane damage originating from lipid peroxidation. Tests on colonies showed a maximum percentage reduction in the number of colonies at 1500 µg·mL−1 concentration, while grain tests were found to inhibit fungal growth, reducing deoxynivalenol content by 89%. The formulation that showed the best performance, i.e., the conjugate complex based on COS and tyrosine, was further investigated in a small-scale field trial with artificially inoculated spelt (Triticum spelta L.), and as a seed treatment to inhibit fungal growth in spelt seedlings. The field experiment showed that the chosen formulation induced a decrease in disease severity, with a control efficacy of 83.5%, while the seed tests showed that the treatment did not affect the percentage of germination and resulted in a lower incidence of root rot caused by the pathogen, albeit with a lower control efficacy (50%). Consequently, the reported conjugate complexes hold enough promise for crop protection applications to deserve further examination in larger field trials, with other Fusarium spp. pathogens and/or Triticum species.

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“…The nut is surrounded by the green husk that contains many bioactive compounds, such as polyphenols, which include flavonoids, [ 6 , 7 ], also known as phenolics [ 8 , 9 , 10 ], and pectin, glucans [ 5 ] and chlorophyll [ 11 ]. The phytochemicals have antimicrobial, antifungal and antioxidant activities [ 8 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

“…The phenolic compounds play an important role in the plant defence mechanisms against stress caused by many environmental factors and various pathogens [ 20 ]. They can inhibit the growth of mycelia and different bacteria up to 50%, but it is indicated that their inhibition effects depend on their concentration and the relationship between the juglone and phenolics present in the plant tissue [ 8 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

“…The phenolic content and its profile vary in all walnut plant organs [ 21 , 22 ]. The quantity of the compounds depends on the soil and climatic conditions [ 5 , 23 ], while the cultivar [ 8 , 10 , 24 , 25 , 26 , 27 ], the sample period inside the growing season [ 28 ], the use of extracting solvent [ 18 , 29 , 30 , 31 , 32 ] and cultivation technology all affect the phenolic content.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Phenolic Compounds on Walnut Bacterial Blight in the Green Husk of Hungarian-Bred Cultivars

Bujdosó

Lengyel-Kónya

Berki

et al. 2022

Plants

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The Persian walnut (Juglans regia L.) is the most grown nut tree crop in Central Europe. The aim was to study the full Hungarian walnut assortment with a distinct early spring phenology to detect the difference in phenolic profile in their green husks. Furthermore, the relationship between the presence and concentration of phenolic compounds and the tolerance/resistance of the observed cultivars to walnut bacterial blight was investigated. Examining the samples, significant differences were found between the concentrations of the different groups of phenolic compounds. Walnut blight immunity tests were also performed to clarify the role of phenolic compounds in the nut derived from a non-irrigated orchard. The Hungarian-bred local cultivars contained phenolic compounds in higher concentrations than the domesticated ones. There was a significant correlation between the budburst, as well as the pistillate flowers’ receptivity and the concentration of juglone. Cultivars with a low concentration of phenolic compounds were the most susceptible to walnut bacterial blight, except ‘Bonifác’.

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Influence of the Extraction Conditions on the Antifungal Properties of Walnut Green Husk Isolates

Cited by 10 publications

References 21 publications

A Central Composite Design in increasing the quercetin content in the aqueous onion waste isolates with antifungal and antioxidant properties

A Central Composite Design in increasing the quercetin content in the aqueous onion waste isolates with antifungal and antioxidant properties

Antifungal Activity of Chitosan Oligomers–Amino Acid Conjugate Complexes against Fusarium culmorum in Spelt (Triticum spelta L.)

Effects of Phenolic Compounds on Walnut Bacterial Blight in the Green Husk of Hungarian-Bred Cultivars

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