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https://www.readbyqxmd.com/read/29130542/safety-evaluation-of-p-synephrine-following-15%C3%A2-days-of-oral-administration-to-healthy-subjects-a-clinical-study
#1
Mohd Shara, Sidney J Stohs, Mahmoud M Smadi
Extracts of bitter orange (BOE, Citrus aurantium L.) and its primary protoalkaloid p-synephrine are extensively consumed as dietary supplements. p-Synephrine is also present in foods and juices prepared from various Citrus species. The safety of p-synephrine has been questioned as a result of structural similarities with ephedrine. This study assessed the cardiovascular (stimulant) and hemodynamic effects of BOE (49 mg p-synephrine) daily given to 16 healthy subjects for 15 days in a placebo-controlled, cross-over, double-blinded study...
November 12, 2017: Phytotherapy Research: PTR
https://www.readbyqxmd.com/read/29103851/interaction-of-p-synephrine-on-the-pharmacodynamics-and-pharmacokinetics-of-gliclazide-in-animal-models
#2
Leela Krishna Vatsavai, Eswar Kumar Kilari
BACKGROUND: Type 2 diabetes is frequently seen in patients suffering from obesity. p-Synephrine and gliclazide are widely used medicines for the treatment of obesity and diabetes, respectively. Based on the relationship between obesity and diabetes, the present study was undertaken to determine the potential for herb-drug interactions between p-synephrine and gliclazide. METHODS: Influence of p-synephrine on the activity of gliclazide was determined by conducting single and multiple dose interaction studies in animal models...
November 3, 2017: Journal of Ayurveda and Integrative Medicine
https://www.readbyqxmd.com/read/29047215/acute-cardiovascular-effects-of-bitter-orange-extract-p-synephrine-consumed-alone-and-in-combination-with-caffeine-in-human-subjects-a-placebo-controlled-double-blind-study
#3
Nicholas A Ratamess, Jill A Bush, Sidney J Stohs, Nicole L Ellis, Ira T Vought, Elizabeth A O'Grady, Jeremy D Kuper, Saif B Hasan, Jie Kang, Avery D Faigenbaum
The purpose was to examine cardiovascular responses to supplementation with p-synephrine alone and in combination with caffeine during quiet sitting. Sixteen subjects were given (in double-blind manner) either 103 mg of p-synephrine (S), 233 mg of caffeine +104 mg of p-synephrine (LC + S), 240 mg of caffeine (LC), 337 mg of caffeine +46 mg of p-synephrine (HC + S), 325 mg of caffeine (HC), or a placebo. The subjects sat quietly for 3 hr while heart rate (HR) and blood pressure were measured. Only HC + S and HC significantly increased mean systolic blood pressure (SBP) during the second hour and tended to increase mean SBP during the third hour...
October 19, 2017: Phytotherapy Research: PTR
https://www.readbyqxmd.com/read/29024325/dose-response-effects-of-p-synephrine-on-fat-oxidation-rate-during-exercise-of-increasing-intensity
#4
Jorge Gutiérrez-Hellín, Juan Del Coso
The aim of this investigation was to determine the effects different doses of p-synephrine on maximal fat oxidation during exercise. Seventeen healthy subjects volunteered to participate in a double-blind and randomised experimental design composed of four identical experimental trials. On four trials separated by 72 h, participants ingested a placebo or 1, 2 or 3 mg/kg of p-synephrine. After resting for 60 min to allow substance absorption, participants performed an exercise test of increasing intensity on a cycle ergometer while gas exchange was measured continuously...
October 11, 2017: Phytotherapy Research: PTR
https://www.readbyqxmd.com/read/28966104/citrus-aurantium-bitter-orange-extract-safety-assessment-by-acute-and-14-day-oral-toxicity-studies-in-rats-and-the-ames-test-for-mutagenicity
#5
N S Deshmukh, S J Stohs, C C Magar, S B Kadam
The primary active constituent in bitter orange extract (BOE) is p-synephrine. This study assessed the safety of a BOE standardized to 50% p-synephrine following short-term exposure to rats and by the Ames Test. Following 5000 mg/kg of the extract orally to female rats all animals survived. Administration at 2000 mg/kg to female rats for four days yielded no signs of toxicity. Five male and five female rats were administered the BOE at 0, 250, 500, 1000 and 2000 mg/kg/day for 14 days. No significant effects were observed at any dose with respect to body weights, food intake, absolute and relative organ weights, hematology, clinical chemistry, and pathology...
September 28, 2017: Regulatory Toxicology and Pharmacology: RTP
https://www.readbyqxmd.com/read/28800181/synephrine-and-phenylephrine-act-as-%C3%AE-amylase-%C3%AE-glycosidase-acetylcholinesterase-butyrylcholinesterase-and-carbonic-anhydrase-enzymes-inhibitors
#6
Parham Taslimi, Hülya Akıncıoglu, İlhami Gülçin
In this paper, synephrine and phenylephrine compounds showed excellent inhibitory effects against human carbonic anhydrase (hCA) isoforms I and II, α-amylase, α-glycosidase, acetylcholinesterase (AChE), and butyrylcholinesterase (BChE). Synephrine and phenylephrine had Ki values of 199.02 ± 16.01 and 65.01 ± 5.00 μM against hCA I and 336.02 ± 74.01 and 92.04  ±  18.03 μM against hCA II, respectively. On the other hand, their Ki values were found to be 169.10  ±  80.03 and 88.03  ±  5...
August 11, 2017: Journal of Biochemical and Molecular Toxicology
https://www.readbyqxmd.com/read/28752649/safety-efficacy-and-mechanistic-studies-regarding-citrus-aurantium-bitter-orange-extract-and-p-synephrine
#7
REVIEW
Sidney J Stohs
Citrus aurantium L. (bitter orange) extracts that contain p-synephrine as the primary protoalkaloid are widely used for weight loss/weight management, sports performance, appetite control, energy, and mental focus and cognition. Questions have been raised about the safety of p-synephrine because it has some structural similarity to ephedrine. This review focuses on current human, animal, in vitro, and mechanistic studies that address the safety, efficacy, and mechanisms of action of bitter orange extracts and p-synephrine...
October 2017: Phytotherapy Research: PTR
https://www.readbyqxmd.com/read/28686835/various-antioxidant-effects-were-attributed-to-different-components-in-the-dried-blossoms-of-citrus-aurantium-l-var-amara-engl
#8
Chun-Yan Shen, Tian-Xing Wang, Xi-Mei Zhang, Jian-Guo Jiang
Citrus aurantium L. var. amara Engl. (CAVA) was traditionally used as an edible and medicinal material in China. Total flavonoids (CAVAF), alkaloids (CAVAA), polysaccharides (CAVAP), coumarins (CAVAC), and neroli (CAVAO) were extracted from CAVA. Hesperidin, naringin, and neohesperidin composed 83.94% of CAVAF, and synephrine represented 50.56% of CAVAA. On the basis of 1,1-diphenyl-2-picrylhydrazyl radical (DPPH(•)), 2,2'-azinobis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt radical cation (ABTS(•) (+)), hydroxyl radical ((•)OH), ferric-reducing antioxidant power (FRAP), and reducing power assays, the antioxidant activities of five components were comprehensively and comparatively investigated...
August 2, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28541668/matrix-effects-and-interferences-of-different-citrus-fruit-coextractives-in-pesticide-residue-analysis-using-ultrahigh-performance-liquid-chromatography-high-resolution-mass-spectrometry
#9
Natalia Besil, Verónica Cesio, Horacio Heinzen, Amadeo R Fernandez-Alba
The matrix effects of ethyl acetate extracts from seven different citrus fruits on the determination of 80 pesticide residues using liquid chromatography coupled to high-resolution time-of-flight mass spectrometry (UHPLC-(ESI)-HR-TOF) at 4 GHz resolution mode were studied. Only 20% of the evaluated pesticides showed noticeable matrix effects (ME) due to coelution with natural products between tR = 3 and 11 min. Principal component analysis (PCA) of the detected coextractives grouped the mandarins and the orange varieties, but separated lemon, oranges, and mandarins from each other...
June 14, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28532150/synephrine-as-a-specific-marker-for-orange-consumption
#10
Matthias Bader, Tatjana Lang, Roman Lang, Thomas Hofmann
To validate the suitability of synephrine, known to be a highly abundant alkaloid in oranges, as a dietary biomarker for orange consumption, a highly sensitive and robust stable isotope dilution analysis (SIDA) as well as an ECHO method, using the analyte itself as a pseudointernal standard injected into the analysis run to provide an "echo peak" of the analyte, was developed to quantitate synephrine by liquid chromatography-tandem mass spectrometry (LC-MS/MS) in citrus juices and human urine before and after the ingestion of orange juice...
June 14, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28501026/metabolically-speaking-possible-reasons-behind-the-tolerance-of-sugar-belle-mandarin-hybrid-to-huanglongbing
#11
Nabil Killiny, Maria Filomena Valim, Shelley E Jones, Ahmad A Omar, Faraj Hijaz, Fred G Gmitter, Jude W Grosser
Huanglongbing (HLB) is currently considered the most destructive disease of citrus. Since its spread to the Americas, HLB has killed millions of trees and caused a sharp decline in production in many citrus growing regions. With the continuous spread of HLB disease in Florida and worldwide, there is an urgent need for the development of commercial citrus cultivars with a strong tolerance to HLB. Interestingly, field observations showed that some of the recently released mandarin hybrids such as 'Sugar Belle' were tolerant to HLB...
May 4, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28372211/synephrine-a-potential-biomarker-for-orange-honey-authenticity
#12
Patrícia A S Tette, Letícia R Guidi, Esther M A F Bastos, Christian Fernandes, Maria Beatriz A Gloria
A LC-MS/MS method for synephrine as a biomarker for orange honey authenticity was developed and validated. The sample was extracted with 5% TCA and cleaned up with Florisil providing 83.7% recoveries. Ions transitions for quantification and identification were 168→135.0 and 168→107.0, respectively. The limits of detection and quantification were 0.66 and 1.0ng/g, respectively. Synephrine was detected in orange honey at levels from 79.2 to 432.2ng/g, but not in other monofloral honeys. It was also present in some wildflower honeys (9...
August 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28271601/phytochemical-compounds-in-sport-nutrition-synephrine-and-hydroxycitric-acid-hca-as-examples-for-evaluation-of-possible-health-risks
#13
REVIEW
Nadiya Bakhiya, Rainer Ziegenhagen, Karen I Hirsch-Ernst, Birgit Dusemund, Klaus Richter, Katharina Schultrich, Sophie Pevny, Bernd Schäfer, Alfonso Lampen
Numerous food supplements contain phytochemical compounds as active ingredients. Although such supplements are often perceived by consumers as being risk-free, the safety of many of them is currently uncertain. The present review provides two examples for risk assessment for phytochemical ingredients that are used in certain supplements marketed for sportspeople-synephrine (extracted from fruits of Citrus aurantium) and hydroxycitric acid (HCA, isolated from fruits of Garcinia cambogia). Animal and human studies, as well as case reports, provide evidence for cardiovascular effects due to ingestion of high synephrine doses, especially in combination with caffeine and physical exertion...
June 2017: Molecular Nutrition & Food Research
https://www.readbyqxmd.com/read/28150474/combined-effects-of-phytochemicals-and-exercise-on-fatty-acid-oxidation
#14
REVIEW
Jong-Hee Kim, Yoonjung Park
Purpose: The purpose of this review is to discuss current views regarding the acute effects of phytochemicals, exercise, and exercise plus phytochemicals on fatty acid oxidation. Methods: Data acquired from human and animal studies were comprehensively assessed to determine the single and combined effects of phytochemicals and exercise on fatty acid oxidation. In addition, underlying mechanisms associated with those conditions that may contribute to the regulation of fat metabolism are discussed...
December 31, 2016: Journal of Exercise Nutrition & Biochemistry
https://www.readbyqxmd.com/read/28131938/rapid-analysis-of-aurantii-fructus-immaturus-zhishi-using-paper-spray-ionization-mass-spectrometry
#15
Xuemei Liu, Zhixin Gu, Yuan Guo, Jingjing Liu, Ming Ma, Bo Chen, Liping Wang
Paper spray-mass spectrometry (PS-MS) is a rapid, solvent-efficient, and high-throughput analytical method for analyzing complex samples. In this study, a PS-MS method was developed to obtain MS profiles of Aurantii Fructus Immaturus (aka Zhishi in Chinese) in positive and negative ion modes. In combination with multivariate analyses, including principal component analysis and cluster analysis, the PS-MS profiles of 25 batches of Zhishi were discriminated in 25 batches of Citri Reticulatae Pericarpium Viride (aka Qingpi in Chinese; an adulterant of Zhishi)...
April 15, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28117581/tyramine-pathways-in-citrus-plant-defense-glycoconjugates-of-tyramine-and-its-n-methylated-derivatives
#16
Luigi Servillo, Domenico Castaldo, Alfonso Giovane, Rosario Casale, Nunzia D'Onofrio, Domenico Cautela, Maria Luisa Balestrieri
Glucosylated forms of tyramine and some of its N-methylated derivatives are here reported for the first time to occur in Citrus genus plants. The compounds tyramine-O-β-d-glucoside, N-methyltyramine-O-β-d-glucoside, and N,N-dimethyltyramine-O-β-d-glucoside were detected in juice and leaves of sweet orange, bitter orange, bergamot, citron, lemon, mandarin, and pomelo. The compounds were identified by mass spectrometric analysis, enzymatic synthesis, and comparison with extracts of Stapelia hirsuta L., a plant belonging to the Apocynaceae family in which N,N-dimethyltyramine-O-β-d-glucoside was identified by others...
February 1, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28096758/effects-of-acute-ingestion-of-a-pre-workout-dietary-supplement-with-and-without-p-synephrine-on-resting-energy-expenditure-cognitive-function-and-exercise-performance
#17
Y Peter Jung, Conrad P Earnest, Majid Koozehchian, Elfego Galvan, Ryan Dalton, Dillon Walker, Christopher Rasmussen, Peter S Murano, Mike Greenwood, Richard B Kreider
BACKGROUND: The purpose of this study was to examine the effects of acute ingestion of a pre-workout dietary supplement (PWS) with and without p-synephrine (S) on perceptions of readiness to perform, cognitive function, exercise performance, and markers of safety. METHODS: In a randomized, double-blind, and counterbalanced manner; 25 healthy and recreationally active male and female participants ingested a flavored maltodextrin placebo (PLA), a PWS containing beta-alanine (3 g), creatine nitrate as a salt (2 g), arginine alpha-ketoglutarate (2 g), N-Acetyl-L-Tyrosine (300 mg), caffeine (284 mg), Mucuna pruiriens extract standardized for 15% L-Dopa (15 mg), Vitamin C as Ascorbic Acid (500 mg), niacin (60 mg), folate as folic acid (50 mg), and Vitamin B12 as Methylcobalamin (70 mg) with 2 g of maltodextrin and flavoring; or, the PWS with Citrus aurantium (PWS + S) extract standardized for 30% p-synephrine (20 mg)...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28096757/effects-of-ingesting-a-pre-workout-dietary-supplement-with-and-without-synephrine-for-8%C3%A2-weeks-on-training-adaptations-in-resistance-trained-males
#18
Y Peter Jung, Conrad P Earnest, Majid Koozehchian, Minye Cho, Nick Barringer, Dillon Walker, Christopher Rasmussen, Mike Greenwood, Peter S Murano, Richard B Kreider
BACKGROUND: The purpose of this study was to examine whether ingesting a pre-workout dietary supplement (PWS) with and without synephrine (S) during training affects training responses in resistance-trained males. METHODS: Resistance-trained males (N = 80) were randomly assigned to supplement their diet in a double-blind manner with either a flavored placebo (PLA); a PWS containing beta-alanine (3 g), creatine nitrate as a salt (2 g), arginine alpha-ketoglutarate (2 g), N-Acetyl-L-Tyrosine (300 mg), caffeine (284 mg), Mucuna pruiriens extract standardized for 15% L-Dopa (15 mg), Vitamin C as Ascorbic Acid (500 mg), niacin (60 mg), folate as folic acid (50 mg), and Vitamin B12 as Methylcobalamin (70 mg); or, the PWS supplement with Citrus aurantium extract containing 20 mg of synephrine (PWS + S) once per day for 8-weeks during training...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28058460/-risk-assessment-of-synephrine-in-dietary-supplements
#19
REVIEW
Nadiya Bakhyia, Birgit Dusemund, Klaus Richter, Oliver Lindtner, Karen Ildico Hirsch-Ernst, Bernd Schäfer, Alfonso Lampen
Synephrine is a sympathomimetic phenylethylamine derivative that occurs naturally in citrus fruits. It is often added to dietary supplements intended for weight loss and enhancement of sports performance, typically in the form of Citrus aurantium extracts and in many cases in combination with caffeine. The health risks of synephrine were evaluated on the basis of the available toxicological data and in accordance to the EFSA guidance on the safety assessment of botanicals and botanical preparations intended for use in food supplements...
March 2017: Bundesgesundheitsblatt, Gesundheitsforschung, Gesundheitsschutz
https://www.readbyqxmd.com/read/28027941/analysis-of-pharmaceutical-adulterants-in-plant-food-supplements-by-uhplc-ms-ms
#20
Paula Paíga, Manuela J E Rodrigues, Manuela Correia, Joana S Amaral, M Beatriz P P Oliveira, Cristina Delerue-Matos
A method based on the Quick, Easy, Cheap, Effective, Rugged, and Safe (QuEChERS) extraction and ultra-high performance liquid chromatography coupled to tandem mass spectrometry (UHPLC-MS/MS) was successfully developed and validated for the analysis of 26 pharmaceutical compounds belonging to different therapeutic classes (anorexics, stimulants, anxiolytics, antidepressants and laxatives), which are all prone to be illegally added into weight-loss plant food supplements (PFS) for their pharmacological activity...
March 1, 2017: European Journal of Pharmaceutical Sciences
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