File Name: pigments in vegetables chlorophylls and carotenoids .zip
- Carotenoids Functionality, Sources, and Processing by Supercritical Technology: A Review
- Pigments in Vegetables
Carotenoids Functionality, Sources, and Processing by Supercritical Technology: A Review
Teacher and Student Resources. Plants make an amazing variety of pigment molecules, far more than animals. After all, plants are creatures of light. They sense light to control their growth and rapid responses to the environment, and they use light as their source of energy. Plants produce pigments to advertise rewards for animals which pollinate flowers and disperse seeds. There are three types of pigments present in the leaves of plants, and their retention or production determines the colors of leaves before they fall from , molecules, beyond the simple chemical formulas that describe the numbers of atoms of different elements making up the molecule.
This paper aims to study the effect of different organic solvents on the extraction of pigments present in callus cultures of E. Attempts have been made to extract pigments from callus cultures through tissue culture system as an alternative replacement for conventional plant cultivation as tissue culture provides unlimited supplies of plant samples. Callus of E. Fresh samples of the callus were harvested and dissolved in various types and concentrations of solvents such as per cent acetone, 80 per cent acetone, 95 per cent ethanol, per cent methanol and 90 per cent methanol. Each of the mixtures was directly centrifuged to get clear supernatant containing pigments of interest. The pigments were detected and subsequently quantified via two simple techniques, ultraviolet-visible UV-Vis spectrophotometer and thin layer chromatography TLC.
Pigments in Vegetables
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Chlorophylls and Carotenoids
The only land dwelling arthropods known to produce carotenoids are aphids , and spider mites , which acquired the ability and genes from fungi. In the human diet, absorption of carotenoids is improved when consumed with fat in a meal. There are over 1, known carotenoids  which can be further categorized into two classes, xanthophylls which contain oxygen and carotenes which are purely hydrocarbons and contain no oxygen. In general, carotenoids absorb wavelengths ranging from to nanometers violet to green light. This causes the compounds to be deeply colored yellow, orange, or red. Carotenoids serve two key roles in plants and algae: they absorb light energy for use in photosynthesis, and they provide photoprotection via non-photochemical quenching. In the eye, lutein , meso-zeaxanthin , and zeaxanthin are present as macular pigments whose importance in visual function, as of , remains under clinical research.
Purslane Portulaca oleracea is a succulent weedy annual in much of the United States. In other parts of the world, purslane is grown as a specialty crop, valued for its nutritional quality. As a leafy crop, purslane contributes carotenoid phytochemicals in the typical Mediterranean diet. Nitrogen N influences plant growth and alters pigment composition and accumulation. However, little is known about the impact N fertility may have on pigment concentrations in purslane shoot tissues. The objective of this study was to evaluate the influence of N fertility levels on biomass and concentrations of nutritionally important carotenoid and chlorophyll pigments in purslane.