Banca de DEFESA: BRUNO JONATAN DE SOUSA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : BRUNO JONATAN DE SOUSA
DATE: 05/07/2023
TIME: 14:00
LOCAL: Sessão pública realizada por videoconferência
TITLE:

Lead in leafy vegetables from organic and conventional production systems: systematic review and meta-analysis

KEY WORDS:

Trace Elements. Lead. Organic food. Conventional farming. Systematic review.

PAGES: 110
BIG AREA: Ciências da Saúde
AREA: Nutrição
SUMMARY:

Lead (Pb) is one the 10 chemicals of major public health concern listed by World Health Organization, being associated with toxicity in all organs. One reason for Pb occurrence in food are agricultural practices, for instance, when pesticides containing Pb are used. In this context, organic production systems are highlighted for not using pesticides. Considering that, this systematic review (SR) and metaanalysis was conducted aiming to investigate if there are differences in Pb levels in organic (OLV) and conventional leafy vegetables (CLV). This SR’s protocol was registered on the PROSPERO platform (CRD42022306048) and based on the PRISMA-P 2015 and its checklist. PECOS was used as a guiding acronym of the present study and of its eligibility criteria, referring to the population (OLV), exposure (Pb levels), comparator (CLV), outcomes (Pb levels in OLV and CLV, and secondary outcomes), and study type (studies reporting primary data). Thus, only analytical, cross-sectional studies which reported data on the analysis of Pb in OLV and CLV were been included. Searches were run on the electronic databases GRICultural OnLine Access (AGRICOLA), CAB Direct, Embase, Food Science and Technology Abstracts (FSTA/EBSCO), GALE Academic OneFile, Google Scholar, International System for Agricultural Science and Technology (AGRIS), Latin American and Caribbean Health Sciences (LILACS), Medline (OVID), ScienceDirect (Elsevier), Scopus, e Web of Science, besides manual searches in articles, directory and archives of thesis and dissertations. No restriction was applied regarding language or publication period. A total of 3,742 registers were imported into the application Rayyan Intelligent Systematic Review. The study selection was conducted by two independent researchers, and conflicting decisions were solved by a third researcher. Revman was the software used for the meta-analyses, and the risk of bias was assessed with the Joanna Briggs Institute critical appraisal checklist for studies reporting prevalence data. GRADE was used for assessing the quality of scientific evidence. After the selection stages, 24 studies were included, of which 22 (91.67%) presented low risk of bias, while two (8.33%) presented medium risk, and none presented high risk. Considering the results reported in dry weight, the mean difference (MD) of the Pb level of 0.22 mg/kg higher in OLV was not significant (p=0.26), being classified as evidence of ‘low certainty’. As for the results reported in fresh weight, the MD of 0.01 mg/kg lower in OLV was significant (p=0.008), being classified as evidence of ‘moderate certainty’, thus answering this SR’s question in favor of OLV. The most frequent vegetables were lettuce, cabbage, spinach and celery. The most frequent analytical methods were inductively coupled plasma mass spectroscopy (ICP-MS) and graphite furnace atomic absorption spectrometry (GFAAS). Four studies (16.67%) presented Pb levels above the maximum limits for at least one sample. Some of the main limitations observed were studies’ non-reporting of Pb detection and quantification limits, nor presenting results in fresh weight.

COMMITTEE MEMBERS:
Interno - 3652554 - FRANCISCO CANINDE DE SOUSA JUNIOR
Presidente - 3211846 - KARLA SUZANNE FLORENTINO DA SILVA CHAVES DAMASCENO
Externa à Instituição - NATÁLIA CALDEIRA DE CARVALHO - UFOP