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Cancho-Gonzalez S, Ferguson P, Herniman JM, Langley GJ. Dispersity determination of poly(ethylene glycol)s using supercritical fluid chromatography-mass spectrometry and different mass analysers. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2024; 38:e9765. [PMID: 38742369 DOI: 10.1002/rcm.9765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Revised: 04/15/2024] [Accepted: 04/18/2024] [Indexed: 05/16/2024]
Abstract
RATIONALE Dispersity values are considered critical quality attributes for the quality control of poly(ethylene glycol) formulations due to the direct impact on drug performance. However, when these polymers are analysed using mass spectrometry, the design of the mass analyser can impact the oligomer response and affect the obtained dispersity values, so further understanding is needed. METHODS The deconvoluted electrospray ionisation mass spectra of poly(ethylene glycol)s obtained using supercritical fluid chromatography (SFC) hyphenated to different mass analysers were compared, and visualisation diagrams were used to understand the differences in the dispersity value calculations. Five calibration approaches based on a surrogate single oligomer that represents the whole distribution, or the whole distribution itself, for response selection, were used to evaluate ionisation efficiency prior to quantitation. The impact of using an internal standard (ISTD) on the expanded uncertainty was also assessed. RESULTS Although there were challenges related to the resolution of multiply charged species when low-resolution instruments were used, similar quantitation capabilities were obtained to those when high-resolution mass analysers were used. Evaluation of approaches using a surrogate oligomer or the whole distribution suggested the independence of both approaches and a constant ionisation efficiency across the oligomer chain length. The higher degree of chromatographic resolution of SFC allowed incorporating a monodispersed ISTD to improve the accuracy and precision of the method. CONCLUSIONS The use of low resolution mass analysers was sufficient to provide accurate and precise dispersity values; however, higher resolution instruments were recommended for characterisation due to the improved mass resolution of ions. The introduction of a monodispersed ISTD improved precision without compromising the calculated dispersity value due to the lack of analyte suppression.
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Affiliation(s)
- Sergio Cancho-Gonzalez
- Faculty of Engineering and Physical Sciences, School of Chemistry, University of Southampton, Southampton, UK
| | - Paul Ferguson
- New Modalities and Parenteral Development, Pharmaceutical Technology and Development, Operations, AstraZeneca, Macclesfield, UK
| | - Julie M Herniman
- Faculty of Engineering and Physical Sciences, School of Chemistry, University of Southampton, Southampton, UK
| | - G John Langley
- Faculty of Engineering and Physical Sciences, School of Chemistry, University of Southampton, Southampton, UK
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Comparative pharmacokinetic study of PEGylated gemcitabine and gemcitabine in rats by LC-MS/MS coupled with pre-column derivatization and MSALL technique. Talanta 2020; 206:120184. [DOI: 10.1016/j.talanta.2019.120184] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Revised: 07/22/2019] [Accepted: 07/26/2019] [Indexed: 11/21/2022]
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Ott B, Skurk T, Lagkouvardos L, Fischer S, Büttner J, Lichtenegger M, Clavel T, Lechner A, Rychlik M, Haller D, Hauner H. Short-Term Overfeeding with Dairy Cream Does Not Modify Gut Permeability, the Fecal Microbiota, or Glucose Metabolism in Young Healthy Men. J Nutr 2018; 148:77-85. [PMID: 29378051 DOI: 10.1093/jn/nxx020] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2017] [Accepted: 10/23/2017] [Indexed: 12/29/2022] Open
Abstract
Background High-fat diets (HFDs) have been linked to low-grade inflammation and insulin resistance. Objective The main purpose of the present study was to assess whether acute overfeeding with an HFD affects insulin sensitivity, gut barrier function, and fecal microbiota in humans. Methods In a prospective intervention study, 24 healthy men [mean ± SD: age 23.0 ± 2.8 y, body mass index (in kg/m2) 23.0 ± 2.1] received an HFD (48% of energy from fat) with an additional 1000 kcal/d (as whipping cream) above their calculated energy expenditure for 7 d. Insulin sensitivity (hyperinsulinemic euglycemic clamp), gut permeability (sugar and polyethylene glycol absorption tests, plasma zonulin), and gut microbiota profiles (high-throughput 16S rRNA gene sequencing) were assessed before and after overfeeding, and 14 d after intervention. Additionally, inflammation markers such as high-sensitivity C-reactive protein, lipopolysaccharide-binding protein, leptin, high-molecular-weight adiponectin, calprotectin, regulated on activation normal, T cell expressed and secreted (RANTES), and monocyte chemoattractant protein-1 were measured in plasma by ELISA. Finally, lipid parameters were analyzed in serum by a laboratory service. Results Although participants gained 0.9 ± 0.6 kg (P < 0.001) body weight, overnutrition was not associated with a significant change in insulin sensitivity (M value and glucose disposal). Overfeeding for 7 d resulted in elevated serum total (10.2%), LDL (14.6%) and HDL (14.8%) cholesterol concentrations (P < 0.01). In contrast, fasting plasma triglyceride significantly declined (29.3%) during overfeeding (P < 0.001). In addition, there were no significant changes in inflammatory markers. Urine excretion of 4 sugars and polyethylene glycol, used as a proxy for gut permeability, and plasma concentration of zonulin, a marker of paracellular gut permeability, were unchanged. Moreover, overfeeding was not associated with consistent changes in gut microbiota profiles, but marked alterations were observed in a subgroup of 6 individuals. Conclusions Our findings suggest that short-term overfeeding with an HFD does not significantly impair insulin sensitivity and gut permeability in normal-weight healthy men, and that changes in dominant communities of fecal bacteria occur only in certain individuals. The study was registered in the German Clinical Trial Register as DRKS00006211.
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Affiliation(s)
- Beate Ott
- Else Kröner-Fresenius-Center of Nutritional Medicine, ZIEL Institute for FOOD and Health, Chair of Analytical Food Chemistry, and Chair of Nutrition and Immunology, Technical University of Munich, Freising, Germany.,ZIEL Institute for FOOD and Health, Chair of Analytical Food Chemistry, and Chair of Nutrition and Immunology, Technical University of Munich, Freising, Germany
| | - Thomas Skurk
- Else Kröner-Fresenius-Center of Nutritional Medicine, ZIEL Institute for FOOD and Health, Chair of Analytical Food Chemistry, and Chair of Nutrition and Immunology, Technical University of Munich, Freising, Germany.,ZIEL Institute for FOOD and Health, Chair of Analytical Food Chemistry, and Chair of Nutrition and Immunology, Technical University of Munich, Freising, Germany
| | - Llias Lagkouvardos
- ZIEL Institute for FOOD and Health, Chair of Analytical Food Chemistry, and Chair of Nutrition and Immunology, Technical University of Munich, Freising, Germany
| | - Sandra Fischer
- ZIEL Institute for FOOD and Health, Chair of Analytical Food Chemistry, and Chair of Nutrition and Immunology, Technical University of Munich, Freising, Germany
| | - Janine Büttner
- Charité-Universitätsmedizin, Medizinische Klinik mit Schwerpunkt Hepatologie und Gastroenterologie, Berlin, Germany
| | - Martina Lichtenegger
- Chair of Analytical Food Chemistry, and Chair of Nutrition and Immunology, Technical University of Munich, Freising, Germany
| | - Thomas Clavel
- ZIEL Institute for FOOD and Health, Chair of Analytical Food Chemistry, and Chair of Nutrition and Immunology, Technical University of Munich, Freising, Germany.,Institute of Medical Microbiology, RWTH University Hospital, Aachen, Germany
| | - Andreas Lechner
- Diabetes Research Group, Medical Department 4, Ludwig-Maximilians Universität, Munich, Germany.,Clinical Cooperation Group Type 2 Diabetes, German Research Center for Environmental Health, Neuherberg, Germany.,Diabetes Research Group, German Center for Diabetes Research, Munich, Germany
| | - Michael Rychlik
- Chair of Analytical Food Chemistry, and Chair of Nutrition and Immunology, Technical University of Munich, Freising, Germany
| | - Dirk Haller
- ZIEL Institute for FOOD and Health, Chair of Analytical Food Chemistry, and Chair of Nutrition and Immunology, Technical University of Munich, Freising, Germany.,Chair of Nutrition and Immunology, Technical University of Munich, Freising, Germany
| | - Hans Hauner
- Else Kröner-Fresenius-Center of Nutritional Medicine, ZIEL Institute for FOOD and Health, Chair of Analytical Food Chemistry, and Chair of Nutrition and Immunology, Technical University of Munich, Freising, Germany.,ZIEL Institute for FOOD and Health, Chair of Analytical Food Chemistry, and Chair of Nutrition and Immunology, Technical University of Munich, Freising, Germany.,Institute of Nutritional Medicine, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
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Ott B, Skurk T, Hastreiter L, Lagkouvardos I, Fischer S, Büttner J, Kellerer T, Clavel T, Rychlik M, Haller D, Hauner H. Effect of caloric restriction on gut permeability, inflammation markers, and fecal microbiota in obese women. Sci Rep 2017; 7:11955. [PMID: 28931850 PMCID: PMC5607294 DOI: 10.1038/s41598-017-12109-9] [Citation(s) in RCA: 107] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2017] [Accepted: 08/31/2017] [Indexed: 12/17/2022] Open
Abstract
Recent findings suggest an association between obesity, loss of gut barrier function and changes in microbiota profiles. Our primary objective was to examine the effect of caloric restriction and subsequent weight reduction on gut permeability in obese women. The impact on inflammatory markers and fecal microbiota was also investigated. The 4-week very-low calorie diet (VLCD, 800 kcal/day) induced a mean weight loss of 6.9 ± 1.9 kg accompanied by a reduction in HOMA-IR (Homeostasis model assessment-insulin resistance), fasting plasma glucose and insulin, plasma leptin, and leptin gene expression in subcutaneous adipose tissue. Plasma high-molecular weight adiponectin (HMW adiponectin) was significantly increased after VLCD. Plasma levels of high-sensitivity C-reactive protein (hsCRP) and lipopolysaccharide-binding protein (LBP) were significantly decreased after 28 days of VLCD. Using three different methods, gut paracellular permeability was decreased after VLCD. These changes in clinical parameters were not associated with major consistent changes in dominant bacterial communities in feces. In summary, a 4-week caloric restriction resulted in significant weight loss, improved gut barrier integrity and reduced systemic inflammation in obese women.
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Affiliation(s)
- Beate Ott
- Else Kröner-Fresenius-Center of Nutritional Medicine, Technical University of Munich, Freising, Germany.,ZIEL Institute for Food and Health, Technical University of Munich, Freising-Weihenstephan, Germany
| | - Thomas Skurk
- Else Kröner-Fresenius-Center of Nutritional Medicine, Technical University of Munich, Freising, Germany.,ZIEL Institute for Food and Health, Technical University of Munich, Freising-Weihenstephan, Germany
| | - Ljiljana Hastreiter
- Else Kröner-Fresenius-Center of Nutritional Medicine, Technical University of Munich, Freising, Germany
| | - Ilias Lagkouvardos
- ZIEL Institute for Food and Health, Technical University of Munich, Freising-Weihenstephan, Germany
| | - Sandra Fischer
- ZIEL Institute for Food and Health, Technical University of Munich, Freising-Weihenstephan, Germany
| | - Janine Büttner
- Charité-Universitätsmedizin, Medizinische Klinik mit Schwerpunkt Hepatologie und Gastroenterologie, Berlin, Germany
| | - Teresa Kellerer
- Else Kröner-Fresenius-Center of Nutritional Medicine, Technical University of Munich, Freising, Germany
| | - Thomas Clavel
- ZIEL Institute for Food and Health, Technical University of Munich, Freising-Weihenstephan, Germany.,Institute of Medical Microbiology, RWTH University Hospital, Aachen, Germany
| | - Michael Rychlik
- Chair of Analytical Food Chemistry, Technical University of Munich, Freising, Germany
| | - Dirk Haller
- ZIEL Institute for Food and Health, Technical University of Munich, Freising-Weihenstephan, Germany.,Chair of Nutrition and Immunology, Technical University of Munich, Freising-Weihenstephan, Germany
| | - Hans Hauner
- Else Kröner-Fresenius-Center of Nutritional Medicine, Technical University of Munich, Freising, Germany. .,ZIEL Institute for Food and Health, Technical University of Munich, Freising-Weihenstephan, Germany. .,Institute of Nutritional Medicine, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany.
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Zhou X, Meng X, Cheng L, Su C, Sun Y, Sun L, Tang Z, Fawcett JP, Yang Y, Gu J. Development and Application of an MSALL-Based Approach for the Quantitative Analysis of Linear Polyethylene Glycols in Rat Plasma by Liquid Chromatography Triple-Quadrupole/Time-of-Flight Mass Spectrometry. Anal Chem 2017; 89:5193-5200. [DOI: 10.1021/acs.analchem.6b04058] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Xiaotong Zhou
- School
of Life Sciences, Jilin University, Changchun, 130012, PR China
| | - Xiangjun Meng
- School
of Life Sciences, Jilin University, Changchun, 130012, PR China
| | - Longmei Cheng
- School
of Life Sciences, Jilin University, Changchun, 130012, PR China
| | - Chong Su
- School
of Life Sciences, Jilin University, Changchun, 130012, PR China
| | - Yantong Sun
- School
of Pharmaceutical Sciences, Jilin University, Changchun 130012, PR China
| | - Lingxia Sun
- School
of Life Sciences, Jilin University, Changchun, 130012, PR China
| | - Zhaohui Tang
- Key
Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, PR China
| | - John Paul Fawcett
- School
of Pharmacy, University of Otago, Dunedin, P.O. Box 56, New Zealand
| | - Yan Yang
- School
of Life Sciences, Jilin University, Changchun, 130012, PR China
| | - Jingkai Gu
- School
of Life Sciences, Jilin University, Changchun, 130012, PR China
- Clinical
Pharmacology Center, Research Institute of Translational Medicine, The First Hospital of Jilin University, Changchun 130061, PR China
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Naftalovich R, Naftalovich D, Greenway FL. Polytetrafluoroethylene Ingestion as a Way to Increase Food Volume and Hence Satiety Without Increasing Calorie Content. J Diabetes Sci Technol 2016; 10:971-6. [PMID: 26810925 PMCID: PMC4928218 DOI: 10.1177/1932296815626726] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Since satiety is largely due to stretch of the stomach and people tend to eat a consistent weight of food, increasing food volume and mass increases satiety. This can be achieved without increasing the calories of food by mixing food with a material that cannot be metabolized. Such a material should be inert, safe, resistant to stomach acid, lack taste, available in powder form, smooth, resistant to heat, and cost effective. Polytetrafluoroethylene (PTFE) is an ideal substance for this purpose. It is a soft plastic that is widely considered to be the most inert material known and is extremely stable. Animal feeding trials showed that rats fed a diet of 25% PTFE for 90 days had no signs of toxicity and that the rats lost weight. This article publishes the data from these subchronic animal feeding trials, reviews the relevant available literature, and hypothesizes that increasing the volume of food by mixing the food with PTFE powder at a ratio of 3 parts food to 1 part PTFE by volume will substantially improve satiety and reduce caloric consumption in people.
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Affiliation(s)
- Rotem Naftalovich
- Department of Anesthesiology, Saint Barnabas Medical Center, Livingston, NJ, USA
| | - Daniel Naftalovich
- Department of Medical Engineering, California Institute of Technology, Pasadena, CA, USA Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Frank L Greenway
- Department of Pharmacology-based Clinical Trials, Pennington Biomedical Research Center, Louisiana State University, Baton Rouge, LA, USA
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