Subcritical water extraction of antioxidant compounds from Seabuckthorn (Hippophae rhamnoides) leaves for the comparative evaluation of antioxidant activity

Kumar, M.S. Yogendra; Dutta, Ruma; Prasad, Dipti; Misra, Kshipra

doi:10.1016/j.foodchem.2011.01.088

Cited by 138 publications

(80 citation statements)

References 25 publications

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“…During hydrothermal liquefaction, water is heated to a subcritical condition between 200 and 350°C under pressurization to reduce its dielectric constant. The dielectric constant can even drop to a value similar to that of ethanol; therefore, sub-critical water is able to solubilize a less polar compound (Duan and Savage, 2011;Kumar et al, 2011). In other words, water at the sub-critical condition can serve as an effective solvent with significantly less corrosion than other chemical solvents.…”

Section: Bio-oil and Biohydrocarbonmentioning

confidence: 99%

A Review: Microalgae and Their Applications in CO2 Capture and Renewable Energy

Klinthong

Yang

Huang

et al. 2015

Aerosol Air Qual. Res.

215

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Fossil fuels, which are recognized as unsustainable sources of energy, are continuously consumed and decreased with increasing fuel demands. Microalgae have great potential as renewable fuel sources because they possess rapid growth rate and the ability to store high-quality lipids and carbohydrates inside their cells for biofuel production. Microalgae can be cultivated on opened or closed systems and require nutrients and CO 2 that may be supplied from wastewater and fossil fuel combustion. In addition, CO 2 capture via photosynthesis to directly fix carbon into microalgae has also attracted the attention of researchers. The conversion of CO 2 into chemical and fuel (energy) products without pollution via this approach is a promising way to not only reduce CO 2 emissions but also generate more economic value. The harvested microalgal biomass can be converted into biofuel products, such as biohydrogen, biodiesel, biomethanol, bioethanol, biobutanol and biohydrocarbons. Thus, microalgal cultivation can contribute to CO 2 fixation and can be a source of biofuels. This article reviews the literature on microalgae that were cultivated using captured CO 2 , technologies related to the production of biofuels from microalgae and the possible commercialization of microalgae-based biofuels to demonstrate the potential of microalgae. In this respect, a number of relevant topics are addressed: the nature of microalgae (e.g., species and composition); CO 2 capture via microalgae; the techniques for microalgal cultivation, harvesting and pretreatment; and the techniques for lipid extraction and biofuel production. The strategies for biofuel commercialization are proposed as well.

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Section: Bio-oil and Biohydrocarbonmentioning

confidence: 99%

A Review: Microalgae and Their Applications in CO2 Capture and Renewable Energy

Klinthong

Yang

Huang

et al. 2015

Aerosol Air Qual. Res.

215

View full text Add to dashboard Cite

show abstract

“…Total flavonoid concentration was determined using a spectrophotometric method previously described by Kumar et al (2011) and Upadhyay et al (2010). The extract (1 ml) was mixed with water (2 ml), 5% NaNO 2 (0.15 ml) and left to react for 6 minutes.…”

Section: Analyses Of Phenolic Compoundsmentioning

confidence: 99%

“…Nevertheless all parts of sea buckthorn plant have been considered valuable, as they contain large amounts of different bioactive substances, including a wide range of polyphenols, tocopherols, carotenoids, fatty acids, sterols, vitamins, minerals, etc. (Saggu et al, 2007;Jain et al, 2008;Kumar et al, 2011). Till now, different parts of sea buckthorn (other than berries) have been used in traditional medicine for the treatment of diseases, such as flu, colitis and enterocolitis, also cardiovascular illnesses, mucosal injuries, dermatological, and digestion disorders (Guliyev et al, 2004;Kumar et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…(Saggu et al, 2007;Jain et al, 2008;Kumar et al, 2011). Till now, different parts of sea buckthorn (other than berries) have been used in traditional medicine for the treatment of diseases, such as flu, colitis and enterocolitis, also cardiovascular illnesses, mucosal injuries, dermatological, and digestion disorders (Guliyev et al, 2004;Kumar et al, 2011). These therapeutic effects mostly are related to the high amount of compounds possessing antioxidant activity (Saggu et al, 2007;Kumar et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…Till now, different parts of sea buckthorn (other than berries) have been used in traditional medicine for the treatment of diseases, such as flu, colitis and enterocolitis, also cardiovascular illnesses, mucosal injuries, dermatological, and digestion disorders (Guliyev et al, 2004;Kumar et al, 2011). These therapeutic effects mostly are related to the high amount of compounds possessing antioxidant activity (Saggu et al, 2007;Kumar et al, 2011). This is in accordance with many reports that have reported a positive correlation between daily intake of fruit, vegetables and other products of plant origin and health improvement (Michel et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Effects of Energy and Macronutrient Intake on Cognitive Function Through the Lifespan

Gibson¹

2013

Proceedings of the Latvian Academy of Sciences. Section B. Natural, Exact, and Applied Sciences

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INTRODUCTIONThis review will briefly consider the impact on cognitive development and function, of variation in intake (insufficient or excessive) of the macronutrients, protein, carbohydrate and fat, and, where its effects can be separated, energy, over the human lifespan. For each macronutrient, attention will be paid to what is known about the role of specific forms for cognition and brain function. This review is mainly concerned with evidence in human beings, and emphasis is placed on highlighting current understanding of the evidence, rather than an extensive review of the literature.All the macronutrients can provide energy, albeit with differing priorities and target organs, as well as carbon for structural functions, and many forms are fundamental to cellular processes governing growth, signalling and survival (Mann and Truswell, 2012). For the brain specifically, carbohydrates provide glucose as the primary energy source, amino acids in proteins provide the precursors for synthesis of neurotransmitters and create their receptors, while fatty acids provide the structural basis of neuronal cell membranes. These properties point to ways in which macronutrient intake may be crucial for optimal brain function.Firstly, the importance of adequate intake of energy and protein, both for the pregnant mother and thus the intrauterine nutritional environment for the foetus, and for the neonate and infant child, will be considered. Breastfeeding will briefly be compared to formula feeding, as the quantity and quality of fats and protein may have implications for cognitive development.Next, the review will discuss evidence for the benefits of breakfast, and other meal types, for cognitive function in school children, adolescents and adults, comparing effects of different forms of breakfast, including the nature of the carbohydrates and the glycaemic index of the meal. For adolescents and adults, there is extensive literature on the effects of glucose loads on cognition, particularly memory and attention: this literature will be summarised, and the strengths and weaknesses of the evidence, and its implications, discussed.PROCEEDINGS OF THE LATVIAN ACADEMY OF SCIENCES. Section B, Vol. 67 (2013), No. 4/5 (685/686), pp. 303-314. DOI: 10.2478/prolas-2013 EFFECTS OF ENERGY AND MACRONUTRIENT INTAKE ON COGNITIVE FUNCTION THROUGH THE LIFESPAN Edward Leigh GibsonDepartment of Psychology, University of Roehampton, London, UK l.gibson@roehampton.ac.uk Communicated by Valdis PîrâgsThis paper reviews effects of both insufficient and excessive energy and macronutrient intake on cognition over the lifespan, including the prenatal period, infancy, childhood, and adulthood. In the brain, the hippocampus is particularly vulnerable to both protein malnutrition and energy undernutrition in utero or infancy, resulting in impaired neurogenesis and deficits in memory and spatial learning, reduced anxiety and increased impulsivity, reflected in impairments of neurotransmitter systems. Conversely, higher protein intake is associated with i...

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Pressurized hot water extraction of polyphenols from plant material

Vergara‐Salinas

Cuevas‐Valenzuela

2015

Biotechnology of Bioactive Compounds

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Subcritical water extraction of antioxidant compounds from Seabuckthorn (Hippophae rhamnoides) leaves for the comparative evaluation of antioxidant activity

Cited by 138 publications

References 25 publications

A Review: Microalgae and Their Applications in CO2 Capture and Renewable Energy

A Review: Microalgae and Their Applications in CO2 Capture and Renewable Energy

Effects of Energy and Macronutrient Intake on Cognitive Function Through the Lifespan

Pressurized hot water extraction of polyphenols from plant material

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