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Astaxanthin Content (astaxanthin + content)
Selected AbstractsCharacterization of Phaffia rhodozyma 3A 4,8 Generated by Low-dose ,-irradiationJOURNAL OF FOOD SCIENCE, Issue 9 2004S.H. Lee ABSTRACT: Astaxanthin content, superoxide dismutase activity, catalase activity, and transmission electron microscopy (TEM) of astaxanthin-hyperproducing mutant 3A 4,8, previously isolated through repeated rounds of ,-irradiation below 10 kGy and visual screening, was examined and compared with wild strain 67,385 and parent strain 2A2N to characterize its mutant. Astaxanthin content of Phaffia rhodozyma was determined using high-performance liquid chromatography. After 10 d culture, 3A 4,8 produced 2.5 mg/g yeast, 78% higher astaxanthin content than parent strain. Mutant exhibited lower superoxide dismutase and higher catalase activities than parent strain. TEM study showed mutant had smaller-sized mitochondria than parent strain. These results indicate ,-irradiation is an effective means of mutagenesis for production of carotenoidhyperproducing mutants. [source] Use of Cyclop-eeze as a substitute for Artemia nauplii in larval rearing of giant freshwater prawn Macrobrachium rosenbergii (De Man 1879)AQUACULTURE NUTRITION, Issue 2 2007C. MOHANAKUMARAN NAIR Abstract Four feeding experiments, replacing 25% (T1), 50% (T2), 75% (T3) and 100% (T4), by dry weight, of the live feed Artemia nauplii for Cyclop-eeze, a new larval feed that was claimed to contain the highest known levels of astaxanthin and omega-3 polyunsaturated fatty acids, were compared against a control that was fed with Artemia and egg custard alone, to the larvae of giant freshwater prawn Macrobrachium rosenbergii (De Man 1879). Analysis of different production characteristics of the larvae revealed that the highest survival up to postlarvae (PL) stage was obtained for T2 in which 50% of the Artemia nauplii were replaced by Cyclop-eeze [freeze-dried (FD) deep frozen (DF)], and the highest astaxanthin content of the larval tissue obtained in T4 in which the larvae were fed 100% Cyclop-eeze, although the survival rate was the lowest in this treatment. The costs of different treatments were also compared. The Artemia consumption million,1 larvae was the highest in control (11490 g), followed by T1 (8240 g), T2 (4990 g), T3 (3730 g) and T4, which completely replaced Artemia from stage 5 onwards (1830 g). The highest consumption of Cyclop-eeze million,1 larvae was in T4 (1670 and 10 880 g), followed by T3 (850 and 5560 g), T2 (410 and 2690 g) and T1 (230 and 1490 g) of FD and DF, respectively. The astaxanthin contents of the late-stage larvae fed under the four treatments were 24.90, 27.40, 28.60 and 35.60 ,g g,1 tissue for T1, T2, T3 and T4, respectively, while that of the control was 23.70 ,g g,1. The lowest cost of live feeds million,1 PL was obtained for T2 (US$ 428.60), followed by T1 (US$ 490.46), control (US$ 529.07) and T3 (US$ 583.26), while it was the highest for T4 (US$ 890.93). The results indicated that Cyclop-eeze could economically replace Artemia nauplii at 50% level that could significantly improve the survival and carotenoid composition of the larvae of M. rosenbergii. [source] Effects of different dosages of astaxanthin on giant freshwater prawn Macrobrachium rosenbergii (De Man) challenged with Lactococcus garvieaeAQUACULTURE RESEARCH, Issue 1 2009Isagani P Angeles Jr Abstract The effects of astaxanthin (AX) injected at 0.67 and 1.34 nmol g,1 BW,1 on the survival, antioxidant capacity, total haemocyte count (THC) and hepatopancreas astaxanthin content of giant freshwater prawn, Macrobrachium rosenbergii, challenged with Lactococcus garvieae were evaluated. AX-injected M. rosenbergii at 1.34 nmol g,1 BW,1 had significantly (P,0.05) higher survival rates. However, AX showed no significant effects on the capacity of certain antioxidant indicators (superoxide dismutase, glutathione peroxidase and glutathione reductase). This implies that L. garvieae infection suppressed the activity of the haemolymph antioxidant system of infected M. rosenbergii. This result suggests that the two different dosages used in this study could not exert significant effects on the tested antioxidant capacity of L. garvieae -infected M. rosenbergii. On the other hand, AX-injected M. rosenbergii at either dose showed a significant increase in the THC and hepatopancreas AX content when compared with the challenged control group. Overall, the results of this study indicate that the injected AX led to an improvement in M. rosenbergii's resistance against L. garvieae infection. [source] | ||||||||||