Seasonal variations of phenolic profiles and antioxidant activity of walnut (<i>Juglans sigillata</i> Dode) green husks

Shi, Bin; Wen-e, Zhang; Xue, Likun; Pan, Xuejun

doi:10.1080/10942912.2017.1381706

Cited by 29 publications

(25 citation statements)

References 45 publications

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“…On the contrary, the relationships between antioxidants (polyphenolics, flavonoids, and Ve) and antioxidant activity have been studied extensively in previous research (Rocchetti, Chiodelli, Giuberti, & Lucini, 2018;Santos et al, 2018). We found that the content of polyphenolics was positively correlated with total flavonoids (r = .91, p < .01), which concurred with the relationship (r = .99, p < .01) in Juglans sigillata Dode reported by Shi, Zhang, Li, and Pan (2018). It was also reported that the level of flavonoids decreased with a decline in the polyphenol content during the rapid enlargement of fruit (Shi et al, 2018).…”

Section: The Inherent Relationships Of Phytochemical Components Amosupporting

confidence: 83%

The effects of cultivar and climate zone on phytochemical components of walnut (Juglans regia L.)

Wang

et al. 2020

Food and Energy Security

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The diversity of cultivars and variation in phytochemical components pose a great threat to the security of foods that contain walnut. The nutrient values of walnut are stipulated according to phytochemical components, which are driven by internal and external factors associated with fruit growth. The objective of this work was to investigate the effects of cultivar and climate zone on the phytochemical components of walnuts. First, differences and relationships of phytochemical components in eleven walnut cultivars harvested from northeastern China were analyzed. Almost all individual phytochemical components among cultivars showed significant differences (p < .05). The results were submitted to correspondence analysis followed by matrix transformation and factor analysis. Fatty acids, amino acids, and minerals (Ca, Na, Fe, Cu, P, and Zn) for the identification and discrimination of eleven walnut cultivars were authenticated. Furthermore, based on essential microelements, essential amino acids, unsaturated fatty acids, and antioxidants, the walnut cultivars realized the precision position in food application. Finally, we confirmed the effects of climate zones on the phytochemical components of walnuts, with variations up to 142%. The climatic factors precipitation and temperature influenced the formation and accumulation of monounsaturated fatty acids, tocopherols, and most minerals. The findings will open promising perspectives for oriented cultivation of walnuts and future application in the food industry.

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Section: The Inherent Relationships Of Phytochemical Components Amosupporting

confidence: 83%

The effects of cultivar and climate zone on phytochemical components of walnut (Juglans regia L.)

Wang

et al. 2020

Food and Energy Security

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“…In large number of studies authors relied on this test when assessing antioxidant abilities of tested compounds. 10,11,23 It is known that the leaves of green walnut, 25 kernels 26 and green husks 10 had high antioxidant activity. Basically, a higher the DPPH radical-scavenging activity is associated with a lower IC 50 value.…”

Section: Antioxidant Activity Of Extracts J Nigra Leavesmentioning

confidence: 99%

“…However, previous research indicated that only about 80 % of the radical scavenging activity could be attributed to the phenolic compounds or flavonoids, signifying that other potent antioxidants are also present in the walnut leaves. 10 The future research will be addressed to the analyses of nonphenolic compounds from black walnut leaves. CONCLUSION In this work, for the first time, a statistical method based on RSM model was used to optimize the extraction of phenolic compounds from J. nigra leaves.…”

Section: Antioxidant Activity Of Extracts J Nigra Leavesmentioning

confidence: 99%

“…[7][8][9] The extraction of polyphenolic compounds from Juglans species has been carried out with methanol and ethanol as solvents. [10][11][12] In recent years two extraction methods such as ultrasound-assisted (US-AE) and microwave-assisted extractions have been used for the extraction of polyphenolic compounds from the leaves of Juglans species. 11,12 US-AE offers a series of advantages such as improved efficiency, reduced extraction time and temperature.…”

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confidence: 99%

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Optimization of ultrasound-assisted extraction of total polyphenolic compounds from Juglans nigra L. leaves

Gavrilović

Rajković

Simić

et al. 2018

JSCS

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The ultrasound-assisted extraction of Juglans nigra L. leaves was optimized with respect to total phenolic content (TP) of the extracts by varying the concentration of aqueous ethanol solution (E) and different solvent-to-solid ratio (S). The influence and optimum of the operating parameters (E and S) was examined using response surface methodology (RSM). The statistical criteria indicated the adequacy, reliability and precision of the developed RSM model. RSM showed that maximum extraction yield of TP 28.59 mg g -1 of draw plant was achieved at the optimal values of 50% E and 20 kg kg -1 S. Using the modelled optimized conditions, the detected relative difference between the predicted and the experimental yield was ±2.3 %. The determined TP content in the extracts varied from 12.54 to 29.26 mg GAE g -1 of dry plant indicated that J. nigra is a valuable source of phenolic substances. The extracts of J. nigra leaves obtained under optimal conditions showed good antioxidant activity (IC 50 = = 18.91±0.03 μg cm -3 ) which was determined by the scavenging effect on 2,2--diphenyl-1-picrylhydrazyl radical. The optimization of the TP extraction process is the important step in improving techno-economics of the potential commercial preparation of J. nigra extracts, as natural source of antioxidants.(CC) 2018 SCS.1274 GAVRILOVIĆ et al. ivity of black walnut, as well as ability of black walnut to depress the tumour growth rate and to prevent lead induced testicular toxicity in rats. [2][3][4][5] The polyphenolic compounds, important parameters in assessing the quality of numerous natural products, are responsible for beneficial health effect these products exhibit. 6 The polyphenolic profiles of bark, sapwood and heartwood, leaves and husks from J. nigra were characterized using different polyphenols (juglone, α-hydrojuglone-4-glucoside, myricetin, myricitrin, sakuranetin, sakuranin, neosakuranin and o-diphenols). [7][8][9] The extraction of polyphenolic compounds from Juglans species has been carried out with methanol and ethanol as solvents. [10][11][12] In recent years two extraction methods such as ultrasound-assisted (US-AE) and microwave-assisted extractions have been used for the extraction of polyphenolic compounds from the leaves of Juglans species. 11,12 US-AE offers a series of advantages such as improved efficiency, reduced extraction time and temperature. 13,14 There several reports on the ultrasound-assisted extraction of polyphenols from J. regia leaves. 11,15 On the other hand, there is no data on US--AE of total phenolics (TP) from J.nigra leaves.Many factors, such as solvent concentration, temperature and extraction time, have been determined to influence the US-AE efficacy of polyphenolic compounds from J. regia leaves. 11 Optimization of ultrasound extraction and simultaneous microwave/ultrasonic-assisted extraction of phenolic compounds from J. regia was assessed. 11,16 Despite the interesting properties of J. nigra and its extracts, there is lack of data regarding the optimal conditions for the pol...

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“…In fact, previous studies on walnut husk and shells with regard to antioxidant activity revealed the polyphenolic compounds in these resources [8][9][10][11]. Stampar, Solar, Hudina, Veberic and Colaric [7] reported the existence of thirteen phenolic compounds in the husk.…”

Section: Introductionmentioning

confidence: 99%

Functional Components, Antioxidant Activity and Hypoglycemic Ability Following Simulated Gastro-Intestinal Digestion of Pigments from Walnut Brown Shell and Green Husk

Sun

Zeng

et al. 2019

Antioxidants

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To assess the effects of digestion on the functional components of walnut pigment and their bioactivities, we developed an in vitro model simulating gastro-intestinal digestion. Results showed an increase in the contents of flavonoids and conjugated phenols (with retention rates higher than 100%) in husk pigment after digestion. The lowest of the 2,2 -azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) radical scavenging abilities was reached in the group with the minimum flavonoid content after digestion. Close correlation was observed between free phenol content and total reducing power, as the reducing power among different groups of husk pigment was in consistent with free phenols changes. The inhibitory effect of walnut pigment on α-amylase with/without digestion enzyme was similar. However, shell pigment showed improved inhibitory effect on α-glucosidase activity, with an increased inhibitory rate of 5.42%. In general, the antioxidant activity and hypoglycemic ability of walnut pigment were prone to chemical and enzymatic changes during simulated digestion, which were also related to the alteration of flavonoids and phenols.

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Seasonal variations of phenolic profiles and antioxidant activity of walnut (Juglans sigillata Dode) green husks

Cited by 29 publications

References 45 publications

The effects of cultivar and climate zone on phytochemical components of walnut (Juglans regia L.)

The effects of cultivar and climate zone on phytochemical components of walnut (Juglans regia L.)

Optimization of ultrasound-assisted extraction of total polyphenolic compounds from Juglans nigra L. leaves

Functional Components, Antioxidant Activity and Hypoglycemic Ability Following Simulated Gastro-Intestinal Digestion of Pigments from Walnut Brown Shell and Green Husk

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