Surface waxes from leaves and fruits of walnut

Prasad, R. B. N.; Gülz, Paul‐Gerhard

doi:10.1016/0031-9422(90)83012-p

Cited by 9 publications

(4 citation statements)

References 9 publications

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“…Although not listed in Table 3, very small concentrations of C 28 , C 30 , and C 32 aldehydes were identified by GC-MS in the extract from the last two sampling dates. This should be expected, as substantial quantities of C 24 , C 26 and C 30 , aldehydes have been reported in the cuticular compounds of walnut leaves (Prasad and Gulz, 1990).…”

Section: Resultsmentioning

confidence: 73%

Changes in Cuticular Compounds of Developing Pecan Leaves

Chortyk¹,

Yates²,

Reilly³

1995

jashs

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Leaf surface compounds of pecan [Carya illinoensis (Wangenh.) C. Koch] were analyzed with regard to developmental stage and to susceptibility to infection by Cladosporium caryigenum (Ell. et Lang. Gottwald). Immature and mature leaves of two resistant (`Elliott' and `Sumner') and two susceptible (`Wichita' and `Schley') cultivars were extracted with methylene chloride. Extracts were separated by silicic acid chromatography into polar and nonpolar fractions. Constituents of each fraction were subsequently separated by gas chromatography and were identified by gas chromatography-mass spectroscopy. Leaf surface constituents characterized included long-chain aliphatic hydrocarbons, aliphatic wax esters, triterpenoid constituents, aliphatic alcohols, fatty acids, and diacyl glycerides. The predominant surface compounds on immature leaves were lipids such as fatty acids, fatty alcohols, and glycerides. On mature leaves, lipids declined and aliphatic hydrocarbons and triterpenoids became predominant leaf surface constituents. The changes were observed for all cultivars, regardless of genotypic response to C. caryigenum. Thus, we conclude that cuticular chemicals change dramatically during leaf maturation but do not correlate with resistance to scab disease common to certain pecan cultivars.

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Section: Resultsmentioning

confidence: 73%

Changes in Cuticular Compounds of Developing Pecan Leaves

Chortyk¹,

Yates²,

Reilly³

1995

jashs

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“…Juglone is present in considerable amounts in all green and growing parts of the trees and unripe hulls of the nuts [66][67][68][69][70][71]. Juglone was also reported in the surface waxes of walnut leaves (1800 μg.g −1 of fresh leaf) and fruits (97 μg.g −1 of fresh fruit) along with hydrocarbons, wax esters, aldehydes, fatty alcohols, and fatty acids [72,73]. Moreover, Juglone shows moderate antimicrobial activity [74].…”

Section: Introductionmentioning

confidence: 99%

Porphyrin based Ni/Co metal-organic framework: Preparation, characterization and photodegradation of 1,5-dihydroxynaphthalene

Bokaei

Rahim

Rabbani

2023

Preprint

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In this study, mixed-metal metal-organic frameworks (MM-MOFs) containing metal-based porphyrin moieties will be synthesized and characterized. Then, efficiency of MOFs with Co and Ni alone and Co/Ni together in the different molar ratios as nodes with Mn-TCPP and H2TCPP as a linker in the structure of bimetallic-MOFs were investigated for photodegradation of DHN to Juglone. Also, different effecting factors on photocatalytic activity containing solvent, oxidant, time, and type of lamp, were further optimized for the best MM-MOF. According to the results, Ni50%/Co50% TCPP-Mn with the molar ratio of 1:1 of Ni:Co shows the highest efficiency in the photocatalytic process which was up to 66.3% under xenon lamp irradiation with blowing of O2 as the source of oxidant. Therefore, the presence both of nickel and cobalt in the structure led to a synergistic effect in enhancement of photocatalytic activity application.

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“…14 The leaves epicuticular waxes contain primary alcohols (41.6%), aldehydes (5.5%), hydrocarbons (3.0%), esters (3.5%), and fatty acids (8.4%). 15 Ascorbic acid is present in walnut leaves in less than a percent. 14 Other compounds present in the leaves can be divided into several groups: tannins, flavonoids, phenolic acids, and naphthalene derivatives.…”

Section: Introductionmentioning

confidence: 99%

Essential Oils of Juglans regia Green and Yellow Leaves

Djapic

2023

Natural Product Communications

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Background/Objective: Juglans regia trees grow all over the Balkan peninsula and their fruit is used in human nutrition. The essential oil of J. regia leaves depends on seasonal and vegetational development. The objective of this study was to analyze the essential oil of J. regia green and yellow leaves and to determine the differences in chemical composition. Methods: The essential oils of green and yellow J. regia leaves were obtained by hydrodistillation. The chemical composition of the obtained essential oils was determined by gas chromatography-mass spectrometry. Results: The essential oil yield from green leaves was 0.02% and the yellow leaves yielded 0.01%. The essential oils obtained had different chemical composition. The main components of the essential oil of the green leaves were: sesquiterpene hydrocarbons (38.5%), oxygenated sesquiterpenes (23.3%), and monoterpene hydrocarbons (22.5%). The principal components of the yellow leaves essential oil were oxygenated sesquiterpenes (75.2%). Conclusion: The results obtained indicated a significant difference in the essential oil chemical composition of green and yellow leaves due to the irreversibility of senescence.

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Surface waxes from leaves and fruits of walnut

Cited by 9 publications

References 9 publications

Changes in Cuticular Compounds of Developing Pecan Leaves

Changes in Cuticular Compounds of Developing Pecan Leaves

Porphyrin based Ni/Co metal-organic framework: Preparation, characterization and photodegradation of 1,5-dihydroxynaphthalene

Essential Oils of Juglans regia Green and Yellow Leaves

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