Autumn carotenoids in the leaves of some trees

Czeczuga, B.

doi:10.1016/0305-1978(86)90063-3

Cited by 17 publications

(8 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Carotenoids were initially determined as absorption differences using the equation of Kirk & Allen (1965). To quantify these, we assumed a 45/55% mixture of carotenes and xanthophylls (based on the proportions found in young or maturing leaves of 25 species by Czeczuga (1986)). From the extinction coefficient (el%, cm"^ in 80% acetone) for p-carotene of 1940 at 482nm and 2160 for lutein at 477nm, and assuming an average relative molecular weight of 545, an estimate of total carotenoids can be made in the presence of chlorophylls:…”

Section: Analysesmentioning

confidence: 99%

Iron‐catalysed oxygen radical formation and its possible contribution to drought damage in nine native grasses and three cereals

Price

Hendry

1991

Plant Cell & Environment

211

View full text Add to dashboard Cite

Abstract. The origin, sequence and location of molecular damage arising during sub‐lethal drought is described in 4‐week‐old wheat (Triticum aestivum L.). Short episodes of water deprivation increased the uptake of iron within 6h of drought. Superoxide, precursor of the highly reactive hydroxyl radical in the presence of iron, was formed in the thylakoid membranes. Further draughting promoted destruction of chlorophylls (but not carotenoids), which was detectable after 14 h and preceded significant losses in relative water content. Peroxidation of lipids and a decreased protein content occurred after 26h of cumulative water deprivation but was confined to the shoots. In contrast, there was no significant loss of protein nor peroxidation of lipids in the root tissue, despite quantitatively larger, more rapid, losses in water content. These results indicate that damage arising in the early phases of drought appears to be initiated within the chloroplast and to be largely confined to the photosynthetic tissue. The pattern of drought‐induced damage in 11 other non‐xerophytes of the north temperate region was qualitatively similar to wheat, although the response to drought of the three cereals was more extreme than in the indigenous grasses and less extreme in ecologically stress‐tolerant species. A method for the simultaneous quantification of carotenoids in the presence of chlorophylls is provided.

show abstract

Section: Analysesmentioning

confidence: 99%

Iron‐catalysed oxygen radical formation and its possible contribution to drought damage in nine native grasses and three cereals

Price

Hendry

1991

Plant Cell & Environment

211

View full text Add to dashboard Cite

show abstract

“…Current studies have shown that artificial food dyes used in the food industry negatively affect human health [1][2][3][4]. The experiments undertaken in the present study were conducted using Aesculus hippocastanum autumn leaves, which are potential colorant sources as they consist of various chlorophylls [5], carotenoids [6], and anthocyanins [7]. Their processing is advantageous as some fallen leaf disposal methods have harmful effects on human health and the environment [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Enhanced pigment content estimation using the Gauss-peak spectra method with thin-layer chromatography for a novel source of natural colorants

Twardowska

2021

PLoS ONE

View full text Add to dashboard Cite

Alternative pigment sources that are harmless to human health and can be produced in an eco-responsible way are of great research interest. The experiments undertaken in this study were conducted using autumn leaves of Aesculus hippocastanum as potential novel colorant sources. This study focused on improving the Gauss-peak spectra method (a less expensive alternative to high-pressure liquid chromatography) in combination with thin-layer chromatography, leading to the development of a new methodology. The collected leaves were stored at two different temperatures: 20°C and −20°C. The data obtained by spectrophotometric scanning of the samples were analyzed using the Gauss-peak spectra method in the R program with three wavelength ranges: 350–750 nm, 390–710 nm, and 400–700 nm. The results were then assessed for statistically significant differences in the estimated concentrations for the different wavelength ranges regarding (1) total pigment, carotenoid, and chlorophyll concentration (two-sample t-test) and (2) concentration of each indicated pigment (two-way analysis of variance). The results were also tested for differences between the estimated concentrations of samples stored under the different conditions. The Gauss-peak spectra results with and without thin-layer chromatography were statistically compared using a paired t-test. The results showed that thin-layer chromatography greatly enhanced the efficiency of the Gauss-peak spectra method for estimating the major and minor pigment composition without generating high additional costs. A wavelength range of 400–700 nm was optimal for all Gauss-peak spectra methods. In conclusion, the proposed method is a more successful, inexpensive alternative to high-pressure liquid chromatography.

show abstract

“…3 and 4). Corresponding changes of carotene to xanthophyll ratios appear to be common in autumn leaves of deciduous trees (Czeczuga, 1986). The xanthophylls, on the other hand, are partially converted to esters (Figs.…”

Section: Pigmentsmentioning

confidence: 98%

Autumn Leaves of Ginkgo biloba L.: Optical Properties, Pigments and Optical Brighteners

1992

View full text Add to dashboard Cite

Senescent leaves of Gingko biloba accumulate fluorescent compounds which may contribute to the golden luminous appearance of the autumnal foliage. Apart from the putative effect of such optical brighteners, the changes of spectral optical properties associated with senescence are due to the breakdown of chlorophyll in conjunction with a remarkably high retention of carotenoids. Carotenoid esters accumulate concomitant with chlorophyll breakdown. Optical properties in the infrared range of the spectrum illustrate the intactness ofleaftissue to the end of the senescence period.

show abstract

Autumn carotenoids in the leaves of some trees

Cited by 17 publications

References 9 publications

Iron‐catalysed oxygen radical formation and its possible contribution to drought damage in nine native grasses and three cereals

Iron‐catalysed oxygen radical formation and its possible contribution to drought damage in nine native grasses and three cereals

Enhanced pigment content estimation using the Gauss-peak spectra method with thin-layer chromatography for a novel source of natural colorants

Autumn Leaves of Ginkgo biloba L.: Optical Properties, Pigments and Optical Brighteners

Contact Info

Product

Resources

About