Results 121 to 130 of about 685 (158)
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Planta, 2005
Tyrosinase or polyphenol oxidase (EC 1.14.18.1) is the key enzyme responsible for melanin biosynthesis and for the enzymatic browning of fruits and vegetables. Although the function of tyrosinase in the secondary metabolism of plants remains unclear, it has been proposed that the enzyme plays a role in the betalain biosynthetic pathway.
Fernando Gandía-Herrero +2 more
exaly +3 more sources
Tyrosinase or polyphenol oxidase (EC 1.14.18.1) is the key enzyme responsible for melanin biosynthesis and for the enzymatic browning of fruits and vegetables. Although the function of tyrosinase in the secondary metabolism of plants remains unclear, it has been proposed that the enzyme plays a role in the betalain biosynthetic pathway.
Fernando Gandía-Herrero +2 more
exaly +3 more sources
Production of yellow‐flowered gentian plants by genetic engineering of betaxanthin pigments
New Phytologist, 2023Summary Genetic engineering of flower color provides biotechnological products such as blue carnations or roses by accumulating delphinidin‐based anthocyanins not naturally existing in these plant species. Betalains are another class of pigments that in plants are only synthesized in the order Caryophyllales.
Keisuke Tasaki +2 more
exaly +3 more sources
Establishing heterologous betaxanthin pigment biosynthesis in cyanobacteria [PDF]
Metabolic EngineeringBetalains are water-soluble pigments with two major classes: red-violet betacyanins and yellow-orange betaxanthins. These pigments are increasingly being sought after as natural replacements for synthetic pigments in the food industry. Traditionally, betalains are extracted from cultivated plants.
Julie A Z Zedler, David A Russo
exaly +3 more sources
A new betaxanthin from Glottiphyllum longum
Phytochemistry, 1973Abstract The new betaxanthin (II) dopaxanthin was isolated from flowers of Glottiphyllum longum . Its structure was confirmed by chemical synthesis.
Sebastiano Sciuto +2 more
exaly +2 more sources
Effect of continuous far red on betaxanthin and betacyanin synthesis
Phytochemistry, 1973Abstract Seedlings of Celosia plumosa under prolonged irradiation with far red light synthesize chlorophyll α and betaxanthin. Levulinic acid and 2,4-dinitrophenol, inhibitors of chlorophyll synthesis and cyclic photophosphorylation respectively, reduce betaxanthin synthesis. Pigment formation is also inhibited by actinomycin- D and puromycin, but
Mario Piattelli
exaly +3 more sources
Development of a protocol for the semi‐synthesis and purification of betaxanthins
Phytochemical Analysis, 2006AbstractA method for the analytical and semi‐preparative chromatographic purification of betaxanthins is described together with an improved procedure for the semi‐synthesis of these compounds from betalamic acid. Standard conditions for obtaining preparative amounts of betaxanthins free of the precursor amino acids are provided.
Fernando, Gandía-Herrero +2 more
openaire +2 more sources
Photophysical properties of betaxanthins: Vulgaxanthin I in aqueous and alcoholic solutions
Journal of Luminescence, 2015Abstract Betaxanthins are yellow pigments present in Caryophyllales plants and some higher fungi. We characterize photophysical properties of vulgaxanthin I and extracts of Amanita muscaria L. Vulgaxanthin I photoexcitation at λexc=476 nm leads to the S1 excited state with the S1→Sn absorption bands at ca. 390 and 920 nm in both aqueous and alcoholic
Wendel, Monika +9 more
openaire +3 more sources
Photocontrol of betaxanthin synthesis in Celosia plumosa seedlings
Phytochemistry, 1973Abstract Light stimulates the betaxanthin accumulation in Celosia plumosa . The induction is partially reversed by far-red and inhibited by actinomycin D, puromycin, salicylaldoxime and 2,4-dinitrophenol, while 3-(3,4-dichlorophenyl)-1,1-dimethylurea has an inhibitory effect only when photosynthesis is operative.
Giudici de Nicola M +2 more
exaly +3 more sources
Betaxanthins as pigments responsible for visible fluorescence in flowers
Planta, 2005Betalains are water-soluble nitrogen-containing pigments present in flowers and fruits of plants of the order Caryophyllales, where they replace anthocyanins. This article describes how flowers containing yellow betaxanthins are fluorescent. Betaxanthins exhibit spectra with excitation maxima between 463 nm and 474 nm and emission maxima between 509 nm
Fernando, Gandía-Herrero +2 more
openaire +2 more sources
Decomposition of betacyanins and betaxanthins by heat and pH changes
Food / Nahrung, 1996AbstractAuthors investigated the decomposition of the main beetroot colourings betanin and vulgaxanthin I as a function of temperature and pH value in acetate and citrate buffer solutions, in a temperature‐range between 60 °C and 80 °C and pH range of 3.3–6.2.The temperature dependence of betain decomposition is characterized by a Q10 value of 2.23 ± 0.
G. Pátkai, J. Barta
openaire +1 more source