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https://www.readbyqxmd.com/read/28317241/organogels-from-double-chained-vitamin-c-amphiphilic-derivatives
#1
Pierandrea Lo Nostro, Elia Tempestini, Martina Bucci, Vincenzo Mastromartino, Marianna Gori, Damiano Tanini, Moira Ambrosi, Emiliano Fratini, Antonella Capperucci
We report on the synthesis and physico-chemical characterization of double chained amphiphilic compounds obtained from vitamin C: Di-alkanoyl-5,6-O-ascorbic acid esters, Di-ASCn, with n = 8, 10 and 12. The acetyl-5-dodecanoyl-6-ascorbic acid ester was synthesized and investigated for comparison. These products are quite insoluble in water and in polar solvents, while they form homogeneous dispersions in cyclohexane. By cooling, these dispersions turn into a gel-like phase. DSC, FTIR, and SAXS/WAXS experiments were carried out to investigate the properties of the pure solids and of their liquid dispersions...
March 20, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28315301/metabolites-of-2-3-diketogulonate-delay-peroxidase-action-and-induce-non-enzymic-h2o2-generation-potential-roles-in-the-plant-cell-wall
#2
Anna Kärkönen, Rebecca A Dewhirst, C Logan Mackay, Stephen C Fry
A proportion of the plant's l-ascorbate (vitamin C) occurs in the apoplast, where it and its metabolites may act as pro-oxidants and anti-oxidants. One ascorbate metabolite is 2,3-diketogulonate (DKG), preparations of which can non-enzymically generate H2O2 and delay peroxidase action on aromatic substrates. As DKG itself generates several by-products, we characterised these and their ability to generate H2O2 and delay peroxidase action. DKG preparations rapidly produced a by-product, compound (1), with λmax 271 and 251 nm at neutral and acidic pH respectively...
March 14, 2017: Archives of Biochemistry and Biophysics
https://www.readbyqxmd.com/read/28306207/development-and-validation-of-a-uhplc-ms-ms-method-for-the-simultaneous-determination-of-five-bioactive-flavonoids-in-rat-plasma-and-comparative-pharmacokinetic-study-after-oral-administration-of-xiaochaihu-tang-and-three-compatibilities
#3
Yunhai Bo, Lijuan Wang, Xiao Wu, Longshan Zhao, Jingyu Yang, Zhili Xiong, Chunfu Wu
An accurate, rapid and reliable ultra high performance liquid chromatography with tandem mass spectrometry method was developed and validated for the simultaneous determination of baicalin, wogonoside, baicalein, wogonin and oroxylinA in rat plasma. Then, the stability of baicalin and baicalein in the preparation of plasma sample was systematically investigated. The Waters BEH C18 column was used with a gradient mobile phase system of acetonitrile and water containing 0.1% formic acid. The analytes were detected in the multiple reaction monitoring mode with positive electrospray ionization...
March 17, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28301692/vitamin-c-supplementation-for-the-primary-prevention-of-cardiovascular-disease
#4
REVIEW
Lena Al-Khudairy, Nadine Flowers, Rebecca Wheelhouse, Obadah Ghannam, Louise Hartley, Saverio Stranges, Karen Rees
BACKGROUND: Vitamin C is an essential micronutrient and powerful antioxidant. Observational studies have shown an inverse relationship between vitamin C intake and major cardiovascular events and cardiovascular disease (CVD) risk factors. Results from clinical trials are less consistent. OBJECTIVES: To determine the effectiveness of vitamin C supplementation as a single supplement for the primary prevention of CVD. SEARCH METHODS: We searched the following electronic databases on 11 May 2016: the Cochrane Central Register of Controlled Trials (CENTRAL) in the Cochrane Library; MEDLINE (Ovid); Embase Classic and Embase (Ovid); Web of Science Core Collection (Thomson Reuters); Database of Abstracts of Reviews of Effects (DARE); Health Technology Assessment Database and Health Economics Evaluations Database in the Cochrane Library...
March 16, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28299420/vegetarian-diets-in-children-a-systematic-review
#5
REVIEW
S Schürmann, M Kersting, U Alexy
PURPOSE: While the prevalence of children on vegetarian diets is assumed to be on the rise in industrialized countries, there are hardly any representative data available. In general, vegetarian diets are presumed to be healthy; nevertheless, there are concerns as to whether the dietary specifications required during infancy, childhood, and adolescence can be met. Therefore, the objective of this systematic review was to evaluate studies on the dietary intake and the nutritional or health status of vegetarian infants, children, and adolescents...
March 15, 2017: European Journal of Nutrition
https://www.readbyqxmd.com/read/28298698/high-pressure-processing-and-thermal-pasteurization-of-strawberry-pur%C3%A3-e-quality-parameters-and-shelf-life-evaluation-during-cold-storage
#6
Krystian Marszałek, Łukasz Woźniak, Sylwia Skąpska, Marta Mitek
This study was aimed at monitoring changes in the quality of strawberry purée preserved by high pressure processing (HPP) and thermal pasteurization (TP) during cold storage (6 °C) and determining its optimal storage period. The storage period of strawberry purée treated at 500 MPa, 50 °C, 15 min based on microbiological changes was 12 weeks. During this period, purée lost 32% of polyphenols, 73% of anthocyanins and entire vitamin C. Color changes described as dE increased up to 5.05 whereas the overall sensory quality decreased by 3 points on a 9-point scale...
March 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28298690/quality-attributes-phytochemical-profile-and-storage-stability-studies-of-functional-ready-to-serve-rts-drink-made-from-blend-of-aloe-vera-sweet-lime-amla-and-ginger
#7
Lokesh K Mishra, Danme Sangma
Aloe vera based RTS formulation was prepared in this study which provides the health benefits of this wonder plant and was also appealing in terms of sensory qualities. In the present study four formulations of A. vera RTS drink with ginger, sweet lime and amla (V1, V2, V3 and V4 were developed). The developed products were subjected to physico-chemical, organoleptic and microbial analysis. The formulation V3 was found to be the most preferred variant with respect to the sensory quality. Further the blends were found to be a good source of vitamin C and other nutritional parameters...
March 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28298688/quality-storability-and-essential-oil-content-of-ligularia-fischeri-during-modified-atmosphere-packaging-storage
#8
M A Mele, M Z Islam, J P Baek, H M Kang
Modified atmosphere packaging (MAP) enhanced the quality and storability of Ligularia fischeri. Oxygen transmission rate (OTR) films were used as a MAP. MAP storage displayed lower fresh weight loss than perforated film. The oxygen, carbon dioxide, and ethylene concentration were properly maintained by a 10,000 cc OTR packaging film at 8 °C and 30,000 cc OTR packaging film at 24 °C. On the last day of storage, the off-odor, such as the acetaldehyde and ethanol concentration, was the lowest in the 10,000 cc OTR film at 8 °C and 30,000 cc OTR film at 24 °C treatments...
March 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28298681/effects-of-thermal-processing-by-nanofluids-on-vitamin-c-total-phenolics-and-total-soluble-solids-of-tomato-juice
#9
S M Jafari, S S Jabari, D Dehnad, S A Shahidi
In this research, our main idea was to apply thermal processing by nanofluids instead of conventional pasteurization processes, to shorten duration of thermal procedure and improve nutritional contents of fruit juices. Three different variables of temperature (70, 80 and 90 °C), nanofluid concentration (0, 2 and 4%) and time (30, 60 and 90 s) were selected for thermal processing of tomato juices by a shell and tube heat exchanger. The results demonstrated that 4% nanofluid concentration, at 30 °C for 30 s could result in 66% vitamin C retention of fresh juice while it was about 56% for the minimum nanofluid concentration and maximum temperature and time...
March 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28298674/using-high-hydrostatic-pressures-to-retain-the-antioxidant-compounds-and-to-reduce-the-enzymatic-activity-of-a-pitaya-pineapple-stenocereus-sp-fragaria-ananassa-beverage
#10
Luisaldo Sandate-Flores, Magdalena de J Rostro-Alanis, Elena Ivonne Mancera-Andrade, Diego A Esquivel-Hernandez, Carlos Brambila-Paz, Roberto Parra-Saldívar, Jorge Welti-Chanes, Zamantha Escobedo-Avellaneda, José Rodríguez-Rodríguez
Pitaya (Stenocereus sp.) is a fruit native to arid and semiarid areas of Mexico. It has high antioxidant activity mainly due to its contents of betalains and phenolics, but its consumption is limited due to very short shelf-life and not very recognized flavor. A beverage of pitaya and pineapple was formulated to improve sensory properties. A high hydrostatic pressure (HHP) study at 400-600 MPa and 25 °C for 2-10 min was applied in the beverage and the effect on the contents of vitamin C, total phenolics and betalains, and the pectin methylesterase (PME) activity of pitaya-pineapple beverages, was evaluated...
March 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28298273/challenges-and-lessons-learned-in-generating-and-interpreting-nhanes-nutritional-biomarker-data
#11
REVIEW
Christine M Pfeiffer, David A Lacher, Rosemary L Schleicher, Clifford L Johnson, Elizabeth A Yetley
For the past 45 y, the National Center for Health Statistics at the CDC has carried out nutrition surveillance of the US population by collecting anthropometric, dietary intake, and nutritional biomarker data, the latter being the focus of this publication. The earliest biomarker testing assessed iron and vitamin A status. With time, a broad spectrum of water- and fat-soluble vitamins was added and biomarkers for other types of nutrients (e.g., fatty acids) and bioactive dietary compounds (e.g., phytoestrogens) were included in NHANES...
March 2017: Advances in Nutrition
https://www.readbyqxmd.com/read/28296285/elevated-seminal-plasma-myeloperoxidase-is-associated-with-a-decreased-sperm-concentration-in-young-men
#12
J M Pullar, A C Carr, S M Bozonet, P Rosengrave, A J Kettle, M C M Vissers
Myeloperoxidase is a major neutrophil protein which generates oxidants that are highly reactive, and if present in seminal fluid, could be potentially damaging to spermatozoa. We recruited young males aged 18-35 years, unscreened for fertility status, for a pilot study measuring seminal plasma myeloperoxidase. On three occasions, over a 3-month period, we measured parameters of semen quality and correlated these with seminal myeloperoxidase protein and activity. After baseline measurement, participants were supplemented daily with 250 mg of vitamin C, a potent scavenger of reactive oxygen species with antiinflammatory activities...
March 10, 2017: Andrology
https://www.readbyqxmd.com/read/28295710/effects-of-supplementation-of-medium-with-different-antioxidants-during-in-vitro-maturation-of-bovine-oocytes-on-subsequent-embryo-production
#13
T C Sovernigo, P R Adona, P S Monzani, S Guemra, Fda Barros, F G Lopes, Clv Leal
The aim of this study was to assess the effects of different antioxidants on the levels of reactive oxygen species (ROS) and glutathione (GSH) in oocytes during in vitro maturation (IVM), as well as on the production of embryos. Oocyte of slaughterhouse-derived cattle ovaries were placed in IVM with different antioxidants: quercetin (2 μM), cysteamine (100 μM), carnitine (0.5 mg/ml), vitamin C (50 μg/ml) or resveratrol (2 μM). Oocytes matured without any antioxidant supplementation were used as control...
March 10, 2017: Reproduction in Domestic Animals, Zuchthygiene
https://www.readbyqxmd.com/read/28294172/effects-of-vitamin-c-supplementation-on-glycaemic-control-a-systematic-review-and-meta-analysis-of-randomised-controlled-trials
#14
REVIEW
A W Ashor, A D Werner, J Lara, N D Willis, J C Mathers, M Siervo
Randomised controlled trials (RCTs) have observed contrasting results on the effects of vitamin C on circulating biomarkers of glycaemic and insulin regulation. We conducted a systematic review and meta-analysis of RCTs testing the effect of vitamin C administration on glucose, HbA1c and insulin concentrations. Four databases (PubMed, Embase, Scopus and Cochrane Library) were used to retrieve RCTs published from inception until April 2016 and testing the effects of vitamin C in adult participants. The screening of 2008 articles yielded 22 eligible studies (937 participants)...
March 15, 2017: European Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28293540/inverse-association-between-dietary-intake-of-selected-carotenoids-and-vitamin-c-and-risk-of-lung-cancer
#15
Martine Shareck, Marie-Claude Rousseau, Anita Koushik, Jack Siemiatycki, Marie-Elise Parent
While diets rich in fruit and vegetables appear to reduce lung cancer risk, the evidence for individual carotenoid and vitamin intakes has been judged too limited to reach firm conclusions. Data from a case-control study of lung cancer (Montreal, QC, Canada, 1996-2002) were used to investigate the role of dietary intakes of β-carotene, α-carotene, β-cryptoxanthin, lutein/zeaxanthin, lycopene, and vitamin C in lung cancer risk. In-person interviews elicited dietary information from 1,105 incident cases and 1,449 population controls...
2017: Frontiers in Oncology
https://www.readbyqxmd.com/read/28293041/association-of-socioeconomic-stratification-with-plasmatic-markers-of-lipoperoxidation-and-antioxidants-in-venezuelan-school-age-children
#16
Nelina Ruiz-Fernández, Virgilio Bosch, Maria Isabel Giacopini
OBJETIVE: To establish association between socioeconomic status and plasmatic markers of lipoperoxidation and antioxidants in Venezuelan school-age children from the middle-class and in critical poverty. METHODS: Cross-sectional study with a sample of 114 school-age children (aged 7-9). The socioeconomic status, dietary intake of macro and micro-nutrients, weight, height, lipid profile, indicators of lipid peroxidation and enzymatic and non-enzymatic antioxidants were determined...
December 30, 2016: Colombia Médica: CM
https://www.readbyqxmd.com/read/28292725/physiological-and-antioxidant-response-of-wheat-triticum-aestivum-seedlings-to-fluoroquinolone-antibiotics
#17
Luqman Riaz, Tariq Mahmood, Mark S Coyne, Azeem Khalid, Audil Rashid, Malik Tahir Hayat, Asim Gulzar, Muhammad Amjad
Combinations of antibiotics occur in terrestrial environments due to excessive prescription, consumption, and disposal and have adverse effects, including crop toxicity. We examined short-term (20-d) toxicity of the fluoroquinolone antibiotics ciprofloxacin, enrofloxacin, levofloxacin, and their mixture in a germination and a greenhouse sand culture study with wheat. We tested the hypothesis that oxidative stress plays a role in toxicity by examining stress products and antioxidants involved in detoxifying reactive oxygen species (ROS) during stress...
March 9, 2017: Chemosphere
https://www.readbyqxmd.com/read/28290364/estimation-of-kinetic-parameters-of-anthocyanins-and-color-degradation-in-vitamin-c-fortified-cranberry-juice-during-storage
#18
Sunisa Roidoung, Kirk D Dolan, Muhammad Siddiq
Color degradation in cranberry juice during storage is the most common consumer complaint. To enhance nutritional quality, juice is typically fortified with vitamin C. This study determined effect of gallic acid, a natural antioxidant, for the preservation of anthocyanins (ACYs) and color, and estimated kinetics of ACYs and color degradation. Juice, fortified with 40-80mg/100mL vitamin C and 0-320mg/100mL gallic acid, was pasteurized at 85°C for 1min and stored at 23°C for 16days. Total monomeric anthocyanins and red color intensity were evaluated spectrophotometrically and data were used to determine degradation rate constants (k values) and order of reaction (n) of ACYs and color...
April 2017: Food Research International
https://www.readbyqxmd.com/read/28283308/percutaneous-collagen-induction-as-an-additive-treatment-for-scar-formation-following-thermal-injuries-preliminary-experience-in-47-children
#19
Rainer Kubiak, Bettina Lange
BACKGROUND: Thermal injuries are one of the most physically and psychologically devastating causes of pediatric trauma. Post-traumatic sequelae such as hypertrophic scars and contractures often result in long lasting morbidity and disfigurement. Conservative therapy, including pressure garments and silicone, is the gold standard for scar management in the pediatric population. Most recently percutaneous collagen induction (PCI) was introduced as an alternative treatment in adults. The aim of this report was to share our experience with PCI in children and adolescents in scar management following thermal injuries...
March 7, 2017: Burns: Journal of the International Society for Burn Injuries
https://www.readbyqxmd.com/read/28283243/chemical-synthesis-redox-transformation-and-identification-of-sonnerphenolic-c-an-antioxidant-in-acer-nikoense
#20
Takehiro Iwadate, Ken-Ichi Nihei
Sonnerphenolic C (3), which was predicted in a redox product of epirhododendrin (1) isolated from Acer nikoense, was synthesized for the first time via the epimeric separation of benzylidene acetal intermediates as a key step. From a similar synthetic route, 1 was obtained concisely. As a result of their antioxidative evaluation, only 3 revealed potent activity. The redox transformation of 1 into 3 was achieved in the presence of tyrosinase and vitamin C. Moreover, 3 was identified in the decoction of A. nikoense by HPLC analysis with the effective use of synthesized 3...
February 24, 2017: Bioorganic & Medicinal Chemistry Letters
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