Subtopic Deep Dive
Pyrrolizidine Alkaloids Chemistry and Toxicology
Research Guide
What is Pyrrolizidine Alkaloids Chemistry and Toxicology?
Pyrrolizidine alkaloids are bicyclic heterocyclic compounds produced by plants, studied for their chemical synthesis, biosynthesis, metabolism, and hepatotoxic mechanisms in toxicology.
Research covers over 600 identified PAs from families like Boraginaceae and Asteraceae, with key reviews by Mattocks (1986, 545 citations) and Robins (1986, 221 citations). Recent work examines kinetics of toxicity (Widjaja et al., 2021, 7 citations) and synthetic analogs (Konovalova et al., 2014, 7 citations). Analytical methods include reactions with Folin-Ciocalteu reagent (Bingley, 1971).
Why It Matters
Pyrrolizidine alkaloids contaminate herbal teas, honey, and grains, causing hepatic veno-occlusive disease; Mattocks (1986) details pyrrole metabolite formation leading to DNA alkylation. Regulations by FDA and EFSA rely on risk assessments from Widjaja et al. (2021), which quantify bioactivation kinetics for safe exposure limits. Synthetic studies like Konovalova et al. (2014) enable production of analogs for pharmacological screening and detoxification agents.
Key Research Challenges
Quantifying Metabolic Kinetics
Toxicity depends on cytochrome P450-mediated conversion to pyrrolic metabolites, varying by PA structure and species (Widjaja et al., 2021). Kinetic models require in vitro and in vivo data integration for accurate risk prediction. Challenges persist in scaling from rodent models to humans.
Developing Selective Syntheses
Synthesizing complex PA scaffolds like dispiro heteroanalogs demands regioselective cyclizations (Konovalova et al., 2014). Fluorinated variants add synthetic hurdles due to polyfluoroalkyl handling (Klipkov et al., 2020). Low yields limit scalability for toxicological studies.
Improving Detection Sensitivity
Trace PA levels in food require sensitive assays beyond Folin-Ciocalteu reactions (Bingley, 1971). Conformational analysis complicates NMR and crystallography (McKay and Culvenor, 1984). Standardization lags for N-oxide forms prevalent in plants.
Essential Papers
Chemistry and Toxicology of Pyrrolizidine Alkaloids
A. R. Mattocks · 1986 · 545 citations
Recent synthesis of thietanes
Jiaxi Xu · 2020 · Beilstein Journal of Organic Chemistry · 29 citations
Thietanes are important aliphatic four-membered thiaheterocycles that are found in the pharmaceutical core and structural motifs of some biological compounds. They are also useful intermediates in ...
Reactions of fused pyrrole-2,3-diones with binucleophiles
Valeriya V. Konovalova, Yurii V. Shklyaev, А. Н. Масливец · 2015 · ARKIVOC · 18 citations
This review summarizes a series of studies on the reactions of 1H-pyrrole-2,3-diones, fused at the C 5 -N 1 bond to nitrogen-containing heterocycles, with nucleophiles, leading to the formation of ...
The Role of Kinetics as Key Determinant in Toxicity of Pyrrolizidine Alkaloids and Their N-Oxides
Frances Widjaja, Yasser Alhejji, Ivonne M.C.M. Rietjens · 2021 · Planta Medica · 7 citations
Abstract Pyrrolizidine alkaloids (PAs) are a large group of plant constituents of which especially the 1,2- unsaturated PAs raise a concern because of their liver toxicity and potential genotoxic c...
Synthesis of dispiro heteroanalogs of pyrrolizidine alkaloids: crystal and molecular structure of substituted 3',4'',5-trioxodispiro[(2'',5''-cyclohexadiene)-1''(4''H),7'-[7H]pyrrolizine-2'(3'H),2-[2H]pyrrole]-1'-carboxamide
Valeriya V. Konovalova, Yuliya S. Rozhkova, Yurii V. Shklyaev et al. · 2014 · ARKIVOC · 7 citations
The crystal and molecular structure of substituted 3',4'',5-trioxodispiro[(2'',5''-cyclohexadiene)-1''(4''H),7'-[7H]pyrrolizine-2'(3'H),2-[2H]pyrrole]-1'-carboxamide was confirmed by X-ray analysis.
The synthesis of polyfluoroalkyl substituted pyrroles as building blocks for obtaining fluorinated pyrrolidine-containing alkaloids
Anton A. Klipkov, Alexander E. Sorochinsky, Karen V. Tarasenko et al. · 2020 · Journal of organic and pharmaceutical chemistry · 1 citations
Aim. To study the synthetic potential of cyclization of N-(β-polyfluoroacyl)vinyl derivatives of proline and N-substituted glycines into polyfluoroalkyl pyrroles, which are useful intermediates to ...
Conformational studies of hepatotoxic pyrrolizidine alkaloids
M. F. McKay, CCJ Culvenor · 1984 · Acta Crystallographica Section A Foundations of Crystallography · 0 citations
Reading Guide
Foundational Papers
Start with Mattocks (1986, 545 citations) for core chemistry and toxicology mechanisms, then Robins (1986, 221 citations) for plant sources and synthesis overview; follow with McKay and Culvenor (1984) for conformational basics underpinning hepatotoxicity.
Recent Advances
Study Widjaja et al. (2021) for kinetics determining toxicity variability; Konovalova et al. (2014) for dispiro analog structures; Klipkov et al. (2020) for fluorinated pyrrole building blocks.
Core Methods
Core techniques: P450 kinetic assays (Widjaja et al., 2021), fused pyrrole-dione cyclizations (Konovalova et al., 2015), X-ray analysis (Konovalova et al., 2014), and colorimetric detection (Bingley, 1971).
How PapersFlow Helps You Research Pyrrolizidine Alkaloids Chemistry and Toxicology
Discover & Search
Research Agent uses citationGraph on Mattocks (1986) to map 545-citing works, revealing toxicology clusters, then exaSearch for 'pyrrolizidine alkaloid kinetics food safety' to find Widjaja et al. (2021) and 50+ related papers from 250M+ OpenAlex corpus.
Analyze & Verify
Analysis Agent applies readPaperContent to extract metabolic pathways from Widjaja et al. (2021), then runPythonAnalysis with pandas to model PA bioactivation rates from kinetic data, verified by CoVe chain-of-verification and GRADE scoring for evidence strength in toxicity claims.
Synthesize & Write
Synthesis Agent detects gaps in synthesis methods post-Konovalova et al. (2014), flags contradictions in conformational data (McKay and Culvenor, 1984), then Writing Agent uses latexEditText, latexSyncCitations, and latexCompile to generate a LaTeX review with exportMermaid diagrams of PA biosynthesis.
Use Cases
"Model PA toxicity kinetics from Widjaja 2021 using Python"
Research Agent → searchPapers('Widjaja pyrrolizidine kinetics') → Analysis Agent → readPaperContent → runPythonAnalysis (pandas curve fitting on rate constants) → matplotlib plot of dose-response exported as figure.
"Draft LaTeX section on PA synthesis analogs"
Synthesis Agent → gap detection on Konovalova 2014 → Writing Agent → latexEditText('insert synthesis scheme') → latexSyncCitations (Mattocks 1986) → latexCompile → PDF with embedded reaction diagrams.
"Find code for PA conformational analysis"
Research Agent → searchPapers('pyrrolizidine conformational McKay') → paperExtractUrls → Code Discovery → paperFindGithubRepo → githubRepoInspect → Python scripts for molecular dynamics simulation of hepatotoxic PAs.
Automated Workflows
Deep Research workflow scans 50+ PA papers via citationGraph from Mattocks (1986), producing structured toxicology report with GRADE scores. DeepScan applies 7-step analysis to Widjaja et al. (2021), checkpoint-verifying kinetic models with runPythonAnalysis. Theorizer generates hypotheses on synthetic PA antidotes from synthesis papers like Klipkov et al. (2020).
Frequently Asked Questions
What defines pyrrolizidine alkaloids?
Pyrrolizidine alkaloids are necine base esters with a 1,2-unsaturated pyrrolizidine nucleus, hepatotoxic via metabolic activation to pyrroles (Mattocks, 1986).
What are main analytical methods?
Methods include Folin-Ciocalteu colorimetry (Bingley, 1971), X-ray crystallography for analogs (Konovalova et al., 2014), and kinetic profiling of P450 bioactivation (Widjaja et al., 2021).
Which are key papers?
Mattocks (1986, 545 citations) reviews chemistry and toxicology; Robins (1986, 221 citations) covers phytochemistry; Widjaja et al. (2021) analyzes toxicity kinetics.
What open problems exist?
Challenges include human-relevant kinetic models beyond rodents (Widjaja et al., 2021), scalable syntheses of fluorinated PAs (Klipkov et al., 2020), and ultrasensitive food contaminant detection.
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