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https://www.readbyqxmd.com/read/28731294/the-bioinorganic-chemistry-of-lead-in-the-context-of-its-toxicity
#1
Wolfgang Maret
Owing to its abundance on earth and its multiple uses by humans, lead (Pb) is a major toxicant that has threatened human health for millennia and continues to do so. There is no safe level of exposure, necessitating a nuanced approach to its control in the food we consume, the water we drink, and the air we breathe. Turnover in soft tissues is within days. In contrast, lead accumulates in bone and turns over with a half-life of about 30 years, though it can be mobilized from bone under physiological and pathophysiological conditions of bone resorption...
April 10, 2017: Metal Ions in Life Sciences
https://www.readbyqxmd.com/read/28730944/integrating-bioassays-and-analytical-chemistry-as-an-improved-approach-to-support-safety-assessment-of-food-contact-materials
#2
Julien Veyrand, Maricel Marin-Kuan, Claudine Bezencon, Nancy Frank, Violaine Guérin, Sander Koster, Hélia Latado, Julie Mollergues, Amaury Patin, Dominique Piguet, Patrick Serrant, Jesus Varela, Benoît Schilter
Food contact materials (FCM) contain chemicals which can migrate into food and result in human exposure. Although it is mandatory to ensure that migration does not endanger human health, there is still no consensus on how to pragmatically assess the safety of FCM since traditional approaches would require extensive toxicological and analytical testing which are expensive and time consuming. Recently, the combination of bioassays, analytical chemistry and risk assessment has been promoted as a new paradigm to identify toxicologically relevant molecules and address safety issues...
July 21, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/28727433/the-53rd-north-american-chemical-residue-workshop
#3
Brian David Eitzer, Sherry T Garris, Joan M Stevens
The 53rd North American Chemical Residue Workshop was held in July 2016. This is a brief review of the workshop including the awarding of the 2nd NACRW Excellence award to Dr. Andre de Kok. It is also an introduction to a special issue of the Journal of Agricultural and Food Chemistry that presents manuscripts of papers presented at that workshop.
July 20, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28721824/potential-anti-inflammatory-effects-of-hesperidin-from-the-genus-citrus
#4
Silvia Tejada, Samuel Pinya, Miquel Martorell, Xavier Capó, Josep A Tur, Antoni Pons, Antoni Sureda
The benefits of the Mediterranean diet for protecting against many diseases are usually attributed to high consumption of certain foods, characterized by the presence of bioactive substances such as polyphenols. Citrus fruits, which are cultivated and consumed worldwide, are typical products of the Mediterranean diet. Inflammation plays an important role in the pathogenesis of numerous diseases such as arthritis, allergies and neurodegenerative disorders, among others. Dietary polyphenols constitute a large family of bioactive substances with potential beneficial effects against a broad group of diseases...
July 18, 2017: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/28719022/engineering-the-surface-of-smart-nanocarriers-using-a-ph-thermal-gsh-responsive-polymer-zipper-for-precise-tumor-targeting-therapy-in-vivo
#5
Penghui Zhang, Yan Wang, Jing Lian, Qi Shen, Chen Wang, Bohan Ma, Yuchao Zhang, Tingting Xu, Jianxin Li, Yongping Shao, Feng Xu, Jun-Jie Zhu
Nanocarrier surface chemistry plays a vital role in mediating cell internalization and enhancing delivery efficiency during in vivo chemotherapy. Inspired by the ability of proteins to alter their conformation to mediate functions, a pH-/thermal-/glutathione-responsive polymer zipper consisting of cell-penetrating poly(disulfide)s and thermosensitive polymers bearing guanidinium/phosphate (Gu(+) /pY(-) ) motifs to spatiotemporally tune the surface composition of nanocarriers for precise tumor targeting and efficient drug delivery is developed...
July 18, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28714500/exploring-the-immunomodulatory-and-anticancer-properties-of-zerumbone
#6
REVIEW
Md Areeful Haque, Ibrahim Jantan, Laiba Arshad, Syed Nasir Abbas Bukhari
Plant-derived immunomodulators and anti-cancer agents have attracted a lot of interest from natural product scientists for their efficacy and safety and their significant contribution towards understanding targeted drug action and drug delivery mechanisms. Zerumbone, the main constituent of Zingiber zerumbet rhizomes, has been investigated for its wide-spectrum role in treating multitargeted diseases. The rhizomes have been used as food flavoring agents in various cuisines and in herbal medicine. Many in vivo and in vitro studies have provided evidence of zerumbone as a potent immunomodulator as well as a potential anti-cancer agent...
July 17, 2017: Food & Function
https://www.readbyqxmd.com/read/28703094/dynamic-headspace-sampling-as-an-initial-step-for-sample-preparation-in-chromatographic-analysis
#7
Wojciech Wojnowski, Tomasz Majchrzak, Tomasz Dymerski, Jacek Gębicki, Jacek Namieśnik
This work represents a brief summary of the use of dynamic headspace (DHS) as a technique for sample preparation in chromatographic analysis. Despite numerous developments in the area of analyte isolation and enrichment, DHS remains one of the fundamental methods used with GC. In our opinion, interest in this technique will not diminish significantly because it conforms to stipulations of green analytical chemistry. Moreover, DHS fulfills the need for methods that facilitate detection and determination of analytes present at ultratrace levels in complex matrices...
July 13, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28702661/clinically-approved-pegylated-nanoparticles-are-covered-by-a-protein-corona-that-boosts-the-uptake-by-cancer-cells
#8
M Papi, D Caputo, V Palmieri, R Coppola, S Palchetti, F Bugli, C Martini, L Digiacomo, D Pozzi, G Caracciolo
Today, liposomes are an advanced technology of drug carriers with a dozen drugs in clinical practice and many more in clinical trials. A bottleneck associated with the clinical translation of liposomes has long been 'opsonization', i.e. the adsorption of plasma proteins at the liposome surface resulting in their rapid clearance from circulation. For decades, the most popular way to avoid opsonization has been grafting polyethylene glycol (PEG) onto the liposome surface. Recent studies have clarified that grafting PEG onto the liposome surface reduces, but does not completely prevent protein binding...
July 12, 2017: Nanoscale
https://www.readbyqxmd.com/read/28702481/data-on-body-weight-and-liver-functionality-in-aged-rats-fed-an-enriched-strawberry-diet
#9
Francesca Giampieri, Josè M Alvarez-Suarez, Massimiliano Gasparrini, Tamara Y Forbes-Hernandez, Sadia Afrin, Corrado Rubini, Antonio Zizzi, Josè L Quiles, Bruno Mezzetti, Maurizio Battino
Here, we present new original data on the effects of strawberry consumption on body weight and liver status of aged rats. Wistar rats aged 19-21 months were fed a strawberry enriched diet prepared by substituting 15% of the total calories with freeze-dried strawberry powder for two months. Body weight, plasma biomarkers of liver injury (alanine transferase, aspartate aminotransferase and alkaline phosphatase) and liver histological analysis were assessed. These data indicate that strawberry supplementation did not interfere with normal animal maintenance and with liver structure and functionality...
August 2017: Data in Brief
https://www.readbyqxmd.com/read/28678528/21st-century-toolkit-for-optimizing-population-health-through-precision-nutrition
#10
Aifric O'Sullivan, Bethany Henrick, Bonnie Dixon, Daniela Barile, Angela Zivkovic, Jennifer Smilowitz, Danielle Lemay, William Martin, J Bruce German, Sara Elizabeth Schaefer
Scientific, technological, and economic progress over the last 100 years all but eradicated problems of widespread food shortage and nutrient deficiency in developed nations. But now society is faced with a new set of nutrition problems related to energy imbalance and metabolic disease, which require new kinds of solutions. Recent developments in the area of new analytical tools enable us to systematically study large quantities of detailed and multidimensional metabolic and health data, providing the opportunity to address current nutrition problems through an approach called Precision Nutrition...
July 5, 2017: Critical Reviews in Food Science and Nutrition
https://www.readbyqxmd.com/read/28670897/polyphenols-physicochemical-biological-properties-and-perspectives-of-their-use-in-a-zero-waste-society
#11
Veronique Cheynier, Heidi Halbwirth
The 28th International Conference on Polyphenols, held in Vienna (Austria) in July 2016, offered a venue for global exchanges on the active research on polyphenols and for the presentation and discussion of the latest advances. The multidisciplinary event attracted 280 scientists from 4 continents working in different fields, from analytical and biosynthetic chemistry through genetic and metabolic engineering, plant physiology, and ecology, to food nutrition and health sciences, as well as industrial applications...
July 3, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28667874/recent-developments-in-biological-activities-of-indanones
#12
REVIEW
Siddappa A Patil, Renukadevi Patil, Shivaputra A Patil
Indanone is one of the privileged structures in medicinal chemistry and it's commonly associated with various pharmacologically active compounds. The indanone moiety is found in several natural compounds and also, it can be used as intermediate in the synthesis of many different types of medicinally important molecules. Among the medicinally important indanones, the most significant drug probably is donepezil (IV), an acetylcholinesterase (AChE) inhibitor, which has been approved by the US Food and Drug Administration for the treatment of Alzheimer's disease (AD)...
June 21, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28664698/puffed-cereals-with-added-chamomile-quantitative-analysis-of-polyphenols-and-optimization-of-their-extraction-method
#13
Tomasz Blicharski, Anna Oniszczuk, Marta Olech, Tomasz Oniszczuk, Agnieszka Wójtowicz, Wojciech Krawczyk, Renata Nowak
[b]Abstract Introduction[/b]. Functional food plays an important role in the prevention, management and treatment of chronic diseases. One of the most interesting techniques of functional food production is extrusion-cooking. Functional foods may include such items as puffed cereals, breads and beverages that are fortified with vitamins, some nutraceuticals and herbs. Due to its pharmacological activity, chamomile flowers are the most popular components added to functional food. OBJECTIVE: Quantitative analysis of polyphenolic antioxidants, as well as comparison of various methods for the extraction of phenolic compounds from corn puffed cereals, puffed cereals with an addition of chamomile (3, 5, 10 and 20%) and from [i]Chamomillae anthodium...
May 11, 2017: Annals of Agricultural and Environmental Medicine: AAEM
https://www.readbyqxmd.com/read/28663032/a-90-day-oral-toxicity-study-of-glycolipids-from-dacryopinax-spathularia-in-cd-%C3%A2-rats
#14
Jens Bitzer, Thomas Henkel, Andrey I Nikiforov, Marisa O Rihner, J Leuschner
The subchronic toxicity of jelly mushroom glycolipids from Dacryopinax spathularia (herein referred to as "AM-1") was studied in Crl:CD(SD) rats. The test item was administered via the drinking water at concentrations of 1.5, 5.0 or 15 mg/mL for 90 days with an additional 4-week recovery period. No test article-related deaths, clinical observations or neurological effects were noted. Decreased drinking water consumption for mid- and high-dose groups was attributable to the reduced palatability of drinking water containing higher test article concentrations...
June 26, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28662347/nutritional-chemistry-of-the-peanut-arachis-hypogaea
#15
Ondulla T Toomer
Peanuts, Arachis hypogaea, are one of the most widely consumed legume globally due to its nutrition, taste and affordability. Peanuts are protein and energy-rich and have been utilized worldwide to address the nutritional needs in developing countries. Currently, its role in a heart-healthy diet has warranted tremendous attention among consumer groups and within the scientific community. Additionally, current studies have identified the value in the phytonutrient composition of peanuts, such as resveratrol, isoflavonoids, phenolic acids, and phytosterols, which may enhance overall health and wellness...
June 29, 2017: Critical Reviews in Food Science and Nutrition
https://www.readbyqxmd.com/read/28654230/synthesis-of-multifunctional-electrically-tunable-fluorine-doped-reduced-graphene-oxide-at-low-temperatures
#16
Faisal Shahzad, Shabi Abbas Zaidi, Chong Min Koo
Doping with heteroatoms is a well-established method to tune the electronic properties and surface chemistry of graphene. Herein, we demonstrate the synthesis of a fluorine-doped reduced graphene oxide (FrGO) at low temperatures that offers multiple opportunities in applied fields. The as-synthesized FrGO product shows a better electrical conductivity of 750 S m(-1) than that of undoped rGO with an electrical conductivity of 195 S m(-1). To demonstrate the multifunctional applications of the as-synthesized FrGO, it was examined for electromagnetic interference shielding and electrochemical sensing of histamine as an important food biomarker...
July 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28648259/semisynthesis-and-spectral-characterization-of-5-methylpyranopelargonidin-and-4-methylfuropelargonidin-and-their-separation-and-detection-in-strawberry-fruit-wine
#17
Ondřej Kurka, Lukáš Kučera, Helena Pelantová, Marek Kuzma, Vladimír Havlíček, Petr Bednář
Condensation of anthocyanins and their aglycons with small organic molecules yields more stable natural dyes, e.g. pyranoanthocyanins arising spontaneously in various food products. Reaction of pelargonidin with acetone produces two isomeric anthocyanidin dyes - 5-methylpyranopelargonidin and 4-methylfuropelargonidin. A robust semipreparative liquid chromatographic method was developed to isolate both derivatives from a simple aged solution of pelargonidin in methanol: acetone: 37% aqueous hydrochloric acid (1:1:0...
August 11, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28644869/status-of-chemistry-lab-safety-in-nepal
#18
Krishna Prasad Kandel, Bhanu Bhakta Neupane, Basant Giri
Chemistry labs can become a dangerous environment for students as the lab exercises involve hazardous chemicals, glassware, and equipment. Approximately one hundred thousand students take chemistry laboratory classes annually in Nepal. We conducted a survey on chemical lab safety issues across Nepal. In this paper, we assess the safety policy and equipment, protocols and procedures followed, and waste disposal in chemistry teaching labs. Significant population of the respondents believed that there is no monitoring of the lab safety in their lab (p<0...
2017: PloS One
https://www.readbyqxmd.com/read/28644760/expression-and-characterization-of-soybean-seed-coat-peroxidase-in-escherichia-coli-bl21-de3
#19
Changqing Liu, Kai Zheng, Ying Xu, Lacmata Tamekou Stephen, Jiming Wang, Hongwei Zhao, Tongqing Yue, Rui Nian, Haibo Zhang, Mo Xian, Huizhou Liu
Soybean seed coat peroxidase(SBP) is a valuable enzyme having a broad variety of applications in analytical chemistry, biochemistry and food processing. In the present study, the sscp gene (Gene ID: 548068) was optimized based on the preferred codon usage of Escherichia coli, synthesized, and expressed in E. coli BL21(DE3). SDS-PAGE and western blot analysis of this expressed protein revealed that its molecular weight is approximately 39 kDa. The effects of induction temperature, concentration of IPTG (isopropyl-β-D-thiogalactoside) and hemin, induction time, expression time were optimized to enhance SBP production with a maximum activity of 11...
June 23, 2017: Preparative Biochemistry & Biotechnology
https://www.readbyqxmd.com/read/28631236/use-of-ctx-i-and-pinp-as-bone-turnover-markers-national-bone-health-alliance-recommendations-to-standardize-sample-handling-and-patient-preparation-to-reduce-pre-analytical-variability
#20
P Szulc, K Naylor, N R Hoyle, R Eastell, E T Leary
N-terminal propeptide of type I procollagen and C-terminal telopeptide of type I collagen are the reference standards for bone turnover markers for monitoring osteoporosis treatment. We provide recommendations for standardized sample handling and encompassing aspects of preanalytical variability to improve the reproductibility of their measurements, their reliability, and clinical interpretation. The International Osteoporosis Foundation and International Federation of Clinical Chemistry bone turnover marker standards working group have identified N-terminal propeptide of type I procollagen (PINP) and C-terminal telopeptide of type I collagen (CTX-I) in the blood to be the international reference standards for bone turnover markers for the prediction of fracture risk and monitoring of osteoporosis treatment...
June 19, 2017: Osteoporosis International
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