Loeffler, Christopher (2021) Ciguatoxins and Ciguatera Poisoning: forecasting risk, method development, and applied outbreak response. [Tesi di dottorato]

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Item Type: Tesi di dottorato
Resource language: English
Title: Ciguatoxins and Ciguatera Poisoning: forecasting risk, method development, and applied outbreak response
Creators:
CreatorsEmail
Loeffler, ChristopherChristopher.Loeffler@bfr.bund.de
Date: 2021
Number of Pages: 183
Institution: Università degli Studi di Napoli Federico II
Department: Farmacia
Dottorato: Scienza del farmaco
Ciclo di dottorato: 34
Coordinatore del Corso di dottorato:
nomeemail
D'Auria, Maria Valeriamadauria@unina.it
Tutor:
nomeemail
Tartaglione, LucianaUNSPECIFIED
Bodi, DorinaUNSPECIFIED
Date: 2021
Number of Pages: 183
Keywords: Ciguatera poisoning; Ciguatoxin; outbreak; Neurotoxic shellfish poisoning; Marine toxin detection; Marine biotoxin; brevetoxin; Neuro-2a cell-based assay; mass spectrometry analysis
Settori scientifico-disciplinari del MIUR: Area 05 - Scienze biologiche > BIO/11 - Biologia molecolare
Area 05 - Scienze biologiche > BIO/13 - Biologia applicata
Area 03 - Scienze chimiche > CHIM/01 - Chimica analitica
Area 03 - Scienze chimiche > CHIM/06 - Chimica organica
Date Deposited: 26 Jan 2022 11:30
Last Modified: 28 Feb 2024 11:32
URI: http://www.fedoa.unina.it/id/eprint/14350

Collection description

Seafood is the most traded food commodity worldwide, providing nearly 20% of the animal protein intake for more than 3.3 billion people; and nearly 40% of total fisheries and aquaculture production are traded internationally every year. Ciguatera poisoning (CP) is a prevalent food-related health risk, caused by the consumption of seafood contaminated with ciguatoxins (CTXs). CTXs are classified as a human health hazard and within the European Union’s (EU) commercial jurisdiction, products containing CTXs must not be placed on the market. The processes for pre-market controls for CTX contaminant analysis exist but are seldom in place due to several factors including the complexity of CTX analysis and the sporadic nature of CTX contamination in seafood products. Several studies are described herein that target (1) prediction, (2) detection, and (3) outbreak response for CP. To investigate if a priori predictors for CP can be accurate, a hyperendemic region for CP was investigated for potential CTX predictors using two locations dissimilar for their environmental conditions. The CTX content measured in 113 fish was found to be distinct by location providing evidence that it may be possible to predict CP in certain situations. To improve an in vitro Neuro-2a cell-based assay method utilized for CTX detection a new cell line modification method was developed and described that resulted in an enhancement in toxin detection sensitivity over the standard method by 1.3-2.6x, depending on the target compound. Using the newly developed method, 45 fish related to a major CP outbreak that occurred in Germany were tested. All fillet portions measured by the assay had CTX contamination found to exceed the EU guidance for CTXs in seafood products and using LC-MS/MS the CTX3C-group was identified. Furthermore, using DNA-barcoding the commercial fish product was authenticated and found to be mislabeled by species. The works presented here can be applied in existing food safety laboratories for investigating CTXs to aid method development, CTX detection, and as a first step towards identifying reliable predictors to prevent CTXs from reaching the market.

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