Results 131 to 140 of about 875 (159)

Production of yellow‐flowered gentian plants by genetic engineering of betaxanthin pigments

New Phytologist, 2023
Summary 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.
Masahiro Nishihara, Akiko Hirabuchi, Fumina Goto, Yuzo Nishizaki, Shota Uesugi, Aiko Watanabe, Keisuke Tasaki, Rie Washiashi, Nobuhiro Sasaki   +8 more
openaire   +2 more sources

Photophysical properties of betaxanthins: Vulgaxanthin I in aqueous and alcoholic solutions

Journal of Luminescence, 2015
Abstract 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, Dominika Szot, Karolina Starzak, Dorota Tuwalska, Gapinski, Jacek, Naskrecki, Ryszard, Prukala, Dorota, Sikorski, Marek, Sławomir Wybraniec, Burdzinski, Gotard   +9 more
openaire   +3 more sources

Betaxanthins as Substrates for Tyrosinase. An Approach to the Role of Tyrosinase in the Biosynthetic Pathway of Betalains [PDF]

Plant Physiology, 2005
Abstract Tyrosinase or polyphenol oxidase (EC 1.14.18.1) is the key enzyme in melanin biosynthesis and in the enzymatic browning of fruits and vegetables. The role of tyrosinase in the secondary metabolism of plants still remains unclear, but its implication in betalain biosynthesis has been proposed.
Fernando Gandía-Herrero, Josefa Escribano, Gandía-Herrero Fernando   +2 more
exaly   +5 more sources

A new betaxanthin from Glottiphyllum longum

Phytochemistry, 1973
Abstract The new betaxanthin (II) dopaxanthin was isolated from flowers of Glottiphyllum longum . Its structure was confirmed by chemical synthesis.
Giuseppe Impellizzeri, Mario Piattelli, Sebastiano Sciuto   +2 more
openaire   +1 more source

Effect of continuous far red on betaxanthin and betacyanin synthesis

Phytochemistry, 1973
Abstract 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
Giudici de Nicola M, Piattelli M, AMICO, Vincenzo   +2 more
openaire   +2 more sources

Photocontrol of betaxanthin synthesis in Celosia plumosa seedlings

Phytochemistry, 1973
Abstract 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, Piattelli M, AMICO, Vincenzo   +2 more
openaire   +2 more sources

Decomposition of betacyanins and betaxanthins by heat and pH changes

Food / Nahrung, 1996
AbstractAuthors 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

Betaxanthins and antioxidant capacity in Stenocereus pruinosus: Stability and use in food

Food Research International, 2017
Betalains are important pigments for the food, pharmaceutical, and cosmetics industry. In the yellow Stenocereus pruinosus fruits (pitayas), total betalain concentration, Folin-Ciocalteu reduction capacity, and antiradical capacity per dry weight were 2345.9μgg-1, 7.3mg gallic acid equivalentsg-1, and 48.8μmol Trolox equivalentg-1, respectively.
Juan A, Rodríguez-Sánchez, María T, Cruz Y Victoria, Blanca E, Barragán-Huerta   +2 more
openaire   +2 more sources

Metabolic Engineering of Escherichia coli for de Novo Production of Betaxanthins

Journal of Agricultural and Food Chemistry, 2020
Betalains are emerging natural pigments with high tinctorial strength and stability, physiological activities, and fluorescent properties for potential application in food, cosmetic, and pharmaceutical industries. Betalains including yellow betaxanthins and red betacyanins are mainly restricted in the Caryophyllales plants.
Yanan Hou, Xue Liu, Shilin Li, Xue Zhang, Sili Yu, Guang-Rong Zhao   +5 more
openaire   +2 more sources

Characterization of some natural and semi-synthetic betaxanthins

Phytochemistry, 1991
Abstract Betalamic acid was conjugated with a variety of amino acids, both protein and non-protein, to yield a series of semi-synthetic betaxanthin standards. Retention characteristics for reverse phase-ion pair HPLC chromatography and optical properties are described for these standards.
G.F. Trezzini, J.-P. Zrÿb
openaire   +1 more source