Polyphenols of Juglans nigra

Gupta, Sapna; Ravindranath, B.; Seshadri, T. R.

doi:10.1016/s0031-9422(00)88569-6

Cited by 40 publications

(21 citation statements)

References 6 publications

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“…In black walnut (Juglans nigra), the effect of extractives on heartwood colour was studied by McGinnes (1975) who showed a visible lightening of wood samples by methanol extraction. Naphtoquinones (a and b hydrojuglone glucoside, juglone, 3±3' bisjuglone, cyclo-trisjuglone), and flavonoids (quercetin, quercitrin, myricetin, myricitrin, sakuranin, neosakuranin) have been found in the root bark of J. nigra and J. regia (Gupta et al 1972;Sidhu et al 1975;Pardhasaradhi and Hari Babu 1978). In Juglans species, most extractives are phenolics.…”

Section: Introductionmentioning

confidence: 99%

Natural wood colouring process in Juglans sp. (J. nigra, J. regia and hybrid J. nigra 23 ×J. regia) depends on native phenolic compounds accumulated in the transition zone between sapwood and heartwood

Burtin¹,

Jay‐Allemand

Charpentier

et al. 1998

Trees

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Natural wood colouring process in Juglans sp. (J. nigra, J. regia and hybrid J. nigra 23´J. regia) depends on native phenolic compounds accumulated in the transition zone between sapwood and heartwood AbstractmRadial distribution of soluble phenolics was investigated at different heights in stems of Juglans nigra, J. regia and hybrids J. nigra 23´J. regia. Four major phenolic compounds were studied: hydrojuglone glucoside (HJG), quercitrin (QUER) and two unknown compounds characterized as two ellagic acid derivatives E1 and E2. HJG and E1 content increased gradually in the sapwood, peaked in the sapwood-heartwood transition zone, and decreased drastically in the heartwood. QUER was accumulated preferentially around the transition zone, and its content was relatively low in the outer part of the sapwood and in the inner part of the heartwood. E2 content was low in the sapwood and increased in the heartwood. The heartwood formation was marked by the accumulation of new soluble compounds. The relationship between wood extractives and wood colour were evaluated and discussed. HJG was considered to be a major precursor of heartwood colour providing chromophores through hydrolysis (deglucosylation), oxidation and polymerization processes.

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Section: Introductionmentioning

confidence: 99%

Natural wood colouring process in Juglans sp. (J. nigra, J. regia and hybrid J. nigra 23 ×J. regia) depends on native phenolic compounds accumulated in the transition zone between sapwood and heartwood

Burtin¹,

Jay‐Allemand

Charpentier

et al. 1998

Trees

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“…31 Vine [61] Vitis vinifera Phenols, flavonols, flavonoids, ascorbic acid, anthocyanin, catalase, peroxidase, polyphenol oxidase 32 Walnut [62] Juglans nigra quinones, oils, tannins; nuts contain essential fatty acids, including cis-linoleic and alfa-linolenic, Nucin or Juglon 33 White Chestnut [63] Aesculus hippocastanum Quercetin and kaempferol, polyphenols 34 Wild Oat [64,65] Bromus ramosus Avenanthramides, saponins, phytoalexin and flavonoids such as vitexin and isovitexin 35 Wild Rose [66,67] Rosa canina Vitamin C, total polyphenols, and total flavonoids 36 Willow [68,69] Salix …”

Section: Role Of Flower Essences In Health Carementioning

confidence: 99%

Curative Powers of Bach Remedies: A Review

Mashru¹

2017

WJPR

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“…Olive tree wood is classified as a moderately durable wood (Govorčin et al 2010). Gupta et al (1972) stated that the durability of wood is related to its phenolic and flavonoid contents. Clark et al (1990) explained that methanol extracts from Juniperus virginiana heartwood and needles exhibited anti-fungal and anti-bacterial activity.…”

Section: Introductionmentioning

confidence: 99%

Chemical Contents and Antifungal Activity of Some Durable Wood Extractives vs. Pleurotus ostreatus

et al. 2015

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The total phenolic content (TPC), total flavonoid content (TFC), phenolic compounds, and antifungal activity of olive (Olea europaea var. sylvestris) and juniper (Juniperus foetidissima) sapwood and heartwood extractives were examined. The extractives were obtained using methanol solvents. The different compounds in extractives were identified and quantified. The antifungal activities of different parts of the olive and juniper wood extractives were determined in vitro. Pleurotus ostreatus mycelium was used for the antifungal activity experiment. Extractive compounds obtained from olive and juniper woods were found to be effective, natural antifungal agents.

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Polyphenols of Juglans nigra

Cited by 40 publications

References 6 publications

Natural wood colouring process in Juglans sp. (J. nigra, J. regia and hybrid J. nigra 23 ×J. regia) depends on native phenolic compounds accumulated in the transition zone between sapwood and heartwood

Natural wood colouring process in Juglans sp. (J. nigra, J. regia and hybrid J. nigra 23 ×J. regia) depends on native phenolic compounds accumulated in the transition zone between sapwood and heartwood

Curative Powers of Bach Remedies: A Review

Chemical Contents and Antifungal Activity of Some Durable Wood Extractives vs. Pleurotus ostreatus

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