The Bright Side of Gelatinous Blooms: Nutraceutical Value and Antioxidant Properties of Three Mediterranean Jellyfish (Scyphozoa)     

Antonella Leone  Raffaella Marina Lecci  Miriana Durante  Federica Meli  Stefano Piraino 《Marine drugs》2015,13(8):4654-4681

Jellyfish are recorded with increasing frequency and magnitude in many coastal areas and several species display biological features comparable to the most popular Asiatic edible jellyfish. The biochemical and antioxidant properties of wild gelatinous biomasses, in terms of nutritional and nutraceutical values, are still largely unexplored. In this paper, three of the most abundant and commonly recorded jellyfish species (Aurelia sp.1, Cotylorhiza tuberculata and Rhizostoma pulmo) in the Mediterranean Sea were subject to investigation. A sequential enzymatic hydrolysis of jellyfish proteins was set up by pepsin and collagenase treatments of jellyfish samples after aqueous or hydroalcoholic protein extraction. The content and composition of proteins, amino acids, phenolics, and fatty acids of the three species were recorded and compared. Protein content (mainly represented by collagen) up to 40% of jellyfish dry weight were found in two of the three jellyfish species (C. tuberculata and R. pulmo), whereas the presence of ω-3 and ω-6 polyunsaturated fatty acids (PUFAs) was significantly higher in the zooxanthellate jellyfish C. tuberculata only. Remarkable antioxidant ability was also recorded from both proteinaceous and non proteinaceous extracts and the hydrolyzed protein fractions in all the three species. The abundance of collagen, peptides and other bioactive molecules make these Mediterranean gelatinous biomasses a largely untapped source of natural compounds of nutraceutical, cosmeceutical and pharmacological interest.  相似文献   

Carotenoids,Phenolic Compounds and Tocopherols Contribute to the Antioxidative Properties of Some Microalgae Species Grown on Industrial Wastewater     

Hamed Safafar  Jonathan van Wagenen  Per M?ller  Charlotte Jacobsen 《Marine drugs》2015,13(12):7339-7356

This study aimed at investigating the potential of microalgae species grown on industrial waste water as a new source of natural antioxidants. Six microalgae from different classes, including Phaeodactylum sp. (Bacillariophyceae), Nannochloropsis sp. (Eustigmatophyceae), Chlorella sp., Dunaniella sp., and Desmodesmus sp. (Chlorophyta), were screened for their antioxidant properties using different in vitro assays. Natural antioxidants, including pigments, phenolics, and tocopherols, were measured in methanolic extracts of microalgae biomass. Highest and lowest concentrations of pigments, phenolic compounds, and tocopherols were found in Desmodesmus sp. and Phaeodactylum tricornuotom microalgae species, respectively. The results of each assay were correlated to the content of natural antioxidants in microalgae biomass. Phenolic compounds were found as major contributors to the antioxidant activity in all antioxidant tests while carotenoids were found to contribute to the 1,1-diphenyl-2-picryl-hydrazil (DPPH) radical scavenging activity, ferrous reduction power (FRAP), and ABTS-radical scavenging capacity activity. Desmodesmus sp. biomass represented a potentially rich source of natural antioxidants, such as carotenoids (lutein), tocopherols, and phenolic compounds when cultivated on industrial waste water as the main nutrient source.  相似文献   

Cultivar‐dependent yield reductions in white clover due to simulated grazing and White clover mosaic virus infection are associated with differences in storage reserves and antioxidant metabolism          下载免费PDF全文

M. G. Corral  P. L. Guy  D. J. Burritt 《Plant pathology》2015,64(6):1292-1299

White clover is considered amongst the most important forage legumes in temperate agricultural systems. It contributes to increased quality of pastures through its ability to fix atmospheric nitrogen, providing high nutritional feed for livestock. White clover is host to the potexvirus White clover mosaic virus (WClMV), which is readily transmitted via animal trampling/grazing and mowing. WClMV infection may strongly impact white clover's performance, affecting its ability to compete with other plants in the pasture. Understanding the extent to which the virus influences white clover's growth and yield may contribute to improve pastoral management by pointing out the importance of stress factors on pasture plant performance and herbage yield. In the current study, the effects of WClMV infection and simulated grazing on white clover's fitness, oxidative damage and the induction of antioxidants were investigated. Two cultivars of white clover, Grasslands Huia and Grasslands Kopu II, were subjected to three harvests. In response to WClMV infection and grazing‐like cutting, white clover experienced oxidative stress as evidenced by the accumulation of lipid peroxides and protein carbonyls. Biomass accumulation, given as fresh weight and dry matter content, was also negatively affected. Both stresses induced an increase in ascorbate and glutathione levels and enhanced the activity of superoxide dismutase, ascorbate peroxidase, glutathione peroxidase, catalase and glutathione reductase. Glutathione S‐transferase activity and the levels of reduced ascorbate and reduced glutathione were not affected by either stress.  相似文献   

An effort to improve the shelf life of breakfast cereals using natural mixed tocopherols     

Vito M. Paradiso  Carmine SummoAntonio Trani  Francesco Caponio 《Journal of Cereal Science》2008

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抗氧化剂对杏和中国李原生质体培养的影响     

马锋旺  李嘉瑞 《西北农林科技大学学报(自然科学版)》1998,26(6):10-13

以杏和中国李种胚愈伤组织为试材,研究了抗氧化剂对原生质体培养效果的影响。结果表明,在酶解液和培养基中加入聚乙烯吡咯烷酮对提高原生质体产量、活力和分裂能力具有显著的效果。在培养基中加入不同浓度的甘氨酸和抗坏血酸也可提高中国李原生质体培养的分裂频率和植板率。  相似文献   

Roles of zinc and selenium in protecting sea cucumber Apostichopus japonicus coelomocytes against lipopolysaccharide‐induced oxidative stress in vitro          下载免费PDF全文

Nan Bai  Min Gu 《Aquaculture Research》2017,48(4):1856-1865

This study investigated the attenuate effects of zinc (Zn) and selenium (Se) on lipopolysaccharide (LPS)‐induced oxidative stress in sea cucumber Apostichopus japonicus coelomocytes in vitro. Coelomocytes were first treated with different concentrations of Zn (0.12, 0.48 and 1.2 mM) and Se (0.06, 0.24 and 0.6 mM) for 12 h and the optimal concentrations of Zn and Se as antioxidants for A. japonicus coelomocytes were selected based on antioxidant parameters including total antioxidant capacity (T‐AOC) and activities of superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx), glutathione‐S‐transferase (GST) and concentration of reduced glutathione (GSH). Next, coelomocytes were pretreated with 0 (control), 0.12 mM Zn or 0.24 mM Se for 12 h, and then were treated with LPS (100 μg mL^?1) for 6 h. Se completely inhibited LPS‐induced increase in superoxide anion () production and lipid peroxidation (LPO) and effectively prevented the LPS‐induced decreases of T‐AOC, activities of SOD, CAT, GPx and GST and concentration of GSH. Zn alleviated the LPS‐induced oxidative stress but the protective effects were not as effective as Se. The present work also proved that suboptimal amount of Zn and Se could impair the antioxidant system of A. japonicus coelomoytes. In conclusion, the present work demonstrated that both Zn and Se, especially Se, have the potentials to be the effective antioxidants for A. japonicus. Further work will be conducted for their optimal administration concentrations in vivo.  相似文献   

Antioxidant Bioactivity of Extracts from Beach Cast Leaves of Posidonia oceanica (L.) Delile     

Concetta Maria Messina  Rosaria Arena  Simona Manuguerra  Yann Pericot  Eleonora Curcuraci  Fanny Kerninon  Giuseppe Renda  Claire Hellio  Andrea Santulli 《Marine drugs》2021,19(10)

The marine environment is a generous source of biologically active compounds useful for human health. In 50 years, about 25,000 bioactive marine compounds have been identified, with an increase of 5% per year. Peculiar feature of algae and plants is the production of secondary metabolites, such as polyphenols, synthesized as a form of adaptation to environmental stress. Posidonia oceanica is a Mediterranean endemic and dominant seagrass and represents a biologically, ecologically and geologically important marine ecosystem. Within this study, methanolic and ethanolic extracts were generated from fresh and dried Posidonia oceanica leaves, with the aim to employ and valorize the beach cast leaves. The best yield and antioxidant activity (polyphenols content equal to 19.712 ± 0.496 mg GAE/g and DPPH IC50 of 0.090 µg/µL.) were recorded in 70% ethanol extracts (Gd-E4) obtained from leaves dried for two days at 60 °C and ground four times. HPLC analyses revealed the presence of polyphenols compounds (the most abundant of which was chicoric acid) with antioxidant and beneficial properties. Bioactive properties of the Gd-E4 extracts were evaluated in vitro using fibroblast cells line (HS-68), subjected to UV induced oxidative stress. Pre-treatment of cells with Gd-E4 extracts led to significant protection against oxidative stress and mortality associated with UV exposure, thus highlighting the beneficial properties of antioxidants compounds produced by these marine plants against photo damage, free radicals and associated negative cellular effects. Beach cast leaves selection, processing and extraction procedures, and the in vitro assay results suggested the potentiality of a sustainable approach for the biotechnological exploitation of this resource and could serve a model for other marine resources.  相似文献   

Antioxidant activity of hydrolysates of deer bone gelatin in a liposome     

ZHAO Yuhong GAO Tian ZHANG Ligang 《东北农业大学学报(英文版)》2007,14(2):143-147

Gelatin extracted from deer bone was hydrolyzed for 3.5-120 min.The degree of hydrolysis was higher from Alcalase- hydrolyzed gelatin than that from neutral proteinase-hydrolyzed gelatin.Alcalase-hydrolyzed gelatin exhibited a stronger antioxidant activity than that of neutral proteinase-hydrolyzed gelatin.Hydrolysates showed strong radical-scavenging ability and Fe~(2 )-chelating activity,both of which were influenced by hydrolysis time.Although nonhydrolyzed gelatin displayed a certain antioxidative effect,it was far less than that of hydrolysates.The hydrolysates of deer bone gelatin can work as a radical stabilizer and metal ion chelator to inhibit lipid oxidation.  相似文献   

Biochemical diversity in wild and cultivated pomegranate (Punica granatum L.) in Pakistan     

Muhammad Nafees  Muhammad Jafar Jaskani  Saeed Ahmad  Muhammad Shahid  Zaffar Malik  Moazzam Jamil 《The Journal of Horticultural Science and Biotechnology》2017,92(2):199-205

The present study was conducted to screen out elite pomegranates through determination of biochemical diversity in wild and cultivated genotypes for a breeding program and for fresh/processed use in industry. The results showed high morphological diversity in accessions of wild pomegranate fruits as compared to cultivated genotypes. The first six principal components covered 80.75 and 75.49% diversity in 53 wild and 62 cultivated pomegranate genotypes, respectively. High values of the coefficient of variance (10.78–18.62%), and a high range of minimum to maximum values of total soluble solids, titratable acidity, ascorbic acid content, total soluble sugars, and total phenolic content (0.10–1.25, 5.88–29.96, 9.69–19.85 and 175.05–595.42), respectively, were recorded in the studied genotypes. Ascorbic acid content had a strong correlation with antioxidant activity (0.952%), super dismutase oxides (0.94%), catalase (0.921%), and titratable acidity (0.91%). Peroxides had a strong correlation (0.88%) with catalase, and 0.81% each with super dismutase oxides and antioxidant activity. Wild and cultivated pomegranates were clustered successfully in separate groups, based on biochemical traits. A variety improvement program and selection of high-quality pomegranate genotypes could help to reduce pomegranate-related malnutrition issues in the human diet.  相似文献   

枸杞中抗氧化性物质的提取及抗氧化性研究   总被引：5，自引：1，他引：4  

靳利娥  谢鲜梅  常丽萍 《林产化学与工业》2006,26(3):55-58

分别采用超声波提取法和索氏提取法对枸杞中抗氧化性物质进行了提取,碘量法测定各提取物的抗氧化活性,并考察了提取物与VC、VE所产生的协同效应,确定了提取枸杞中抗氧化物的最佳方法。结果表明:超声波提取法具有时间短,操作简单的特点;枸杞中含有一定量的抗氧化性物质,其抗氧化性低于合成的抗氧化剂2,6-二叔丁基对甲酚(BHT)和VC,但高于VE和柠檬酸。其中,用60%的乙醇对枸杞进行提取得到的提取物其抗氧化性最强。同VC、VE的协同实验证实:无论是VC还是VE同枸杞提取物均能产生很强的协同效应,其协同效果高于BHT的抗氧化性,其中,VC的协同效果高于VE。因此从枸杞中提取抗氧化性物质并同VC使用可替代BHT。  相似文献