three different experiments were conducted to study the effect of dietary astaxanthin on the immune response, resistance to white spot syndrome virus (wssv) and transcription of antioxidant enzyme genes in pacific white shrimp litopenaeus vannamei. each experiment included one triplicate treatment group (fed with 80 mg/kg astaxanthin supplemented diet) and one triplicate control group (fed with...

Haematococcus lacustris (formerly called pluvialis) is regarded as the most promising microalgae for production of natural astaxanthin, which secondary metabolism used a dietary supplement, also cosmetic applications, due to its high anti-oxidant activity. Astaxanthin has wide range biological activities and economic potential, currently dominates market in synthetic form. Furthermore, because ...

We have demonstrated that astaxanthin reduces glomerular oxidative stress as well as inhibits the increase in urinary albumin in diabetic db/db mice. The aim of the present study was to determine the gene expression patterns in the glomerular cells of the diabetic mouse kidney, and to investigate the effects of astaxanthin on the expression of these genes using a high-density DNA microarray. Th...

Three different experiments were conducted to study the effect of dietary astaxanthin on the immune response, resistance to white spot syndrome virus (WSSV) and transcription of antioxidant enzyme genes in Pacific white shrimp Litopenaeus vannamei. Each experiment included one triplicate treatment group (fed with 80 mg/kg astaxanthin supplemented diet) and one triplicate control group (fed with...

The habitats of the genus Altererythrobacter are various, including marine sediment, seawater, rhizosphere of wild rice, desert sand, etc. The genome of the type strain of Altererythrobacter troitsensis JCM 17037, isolated from sea urchin, was sequenced. This study would not only facilitate the understanding of the physiology, adaptation, and evolution of the Altererythrobacter species, but als...

This report gives an insight into the specific changes in the transcription of four key carotenogenic genes [encoding geranylgeranyl diphosphate synthase (crtE), phytoene desaturase (crtI), phytoene synthase lycopene cyclase (crtYB), and astaxanthin synthase (ast), respectively] in Xanthophyllomyces dendrorhous cultures, with regard to dissolved oxygen (DO) contents of 10%, 25%, and 40% air sat...

1. The presence of astaxanthin in the shell of Ophidiaster ophidianus is confirmed, and that of #-carotene and cryptoxanthin demonstrated. neop-Carotene B and y-carotene are also probably present. 2. Three new pigments are reported: two are probably keto-carotenoids. 3. The quantitative distribution of carotenoids in the shell of 0. ophidianus is recorded. 4. A possible biosynthetic route from ...

Astaxanthin is a xanthophill pigment with commercial application in the aquaculture, pharmaceutical, food and cosmetic industries. The red yeast Xanthophyllomyces dendrorhous is one of the most promising microorganisms for its industrial production. However, astaxanthin content in wild yeast strains is low. Pigment production by X. dendrorhous can be improved by mutagenesis. The aim of the stud...

Astaxanthin, a kind of photosynthetic pigment, was employed for gold nanoparticle formation. Nanoparticles were characterized using Ulteraviolet-Visible (UV-Vis) spectroscopy, transmission electron microscopy, and X-ray diffraction, and the possible presence of astaxanthin functional groups were analyzed by Fourier transform infrared spectroscopy (FTIR). The cytotoxic effect of synthesized nano...

Abstract The antioxidant astaxanthin is known to accumulate in Haematococcus pluvialis algae under unfavorable environmental conditions for normal cell growth. The accumulated astaxanthin functions as a protective agent against oxidative stress damage, and tolerance to excessive reactive oxygen species (ROS) is greater in astaxanthin-rich cells. The detailed mechanisms of protection have remain...