Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 3 de 3
Filtrar
Mais filtros










Base de dados
Intervalo de ano de publicação
1.
PLoS One ; 17(12): e0278686, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-36520940

RESUMO

Numerous studies have investigated concentrations of lead (Pb) and cadmium (Cd) in rice in China, but have come to divergent conclusions. Therefore we systematically reviewed and meta-analyzed the available evidence on levels of Pb and Cd in rice in different regions of China in order to assess the potential risk to human health. The meta-analysis included 24 studies of Pb levels and 29 studies of Cd levels, published in 2011-2021. The pooled Pb concentration in rice was 0.10 mg per kg dry weight (95% CI 0.08-0.11), while the pooled Cd concentration was 0.16 mg per kg dry weight (95% CI 0.14-0.18). These levels are within the limits specified by national food safety standards. However, the total target hazard quotient for both metals exceeded 1.0 for adults and children, suggesting that rice consumption poses a health risk.


Assuntos
Metais Pesados , Oryza , Poluentes do Solo , Adulto , Criança , Humanos , Cádmio/análise , Chumbo/análise , Contaminação de Alimentos/análise , China , Poluentes do Solo/análise , Medição de Risco , Metais Pesados/análise
2.
Food Chem ; 192: 441-51, 2016 Feb 01.
Artigo em Inglês | MEDLINE | ID: mdl-26304371

RESUMO

A multi-wavelength HPLC fingerprint comparison method was proposed for the screening of oil-soluble synthetic dyes in chilli products. The screening was based on the fingerprint differences of normal unadulterated chilli sample with tested chilli samples. The samples were extracted with acetone and fingerprinted by HPLC under four visible light wavelengths (450 nm, 490 nm, 520 nm, and 620 nm). It was found that the fingerprints of different chilli product samples had a relatively fixed number of peaks and stable retention time. When 16 kinds of known synthetic dyes were used as model analytes to assess the screening efficiency, 14 of them could be screened using fingerprint comparison method, with LOD of 0.40-2.41 mg/kg. The new screening method was simple and had the possibility of finding existence of the adulterated dyes which could not be identified using known standard analytes as control.


Assuntos
Compostos Azo/química , Capsicum/química , Cromatografia Líquida de Alta Pressão/métodos , Corantes/química , Medicamentos de Ervas Chinesas/farmacologia , Extratos Vegetais/farmacologia , Compostos Azo/análise , Corantes/análise
3.
Virol Sin ; 26(3): 198-205, 2011 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-21667340

RESUMO

Lepidopteran heat-tolerant (ht) cell lines have been obtained with sf-9, sf-21 and several Bombyx cells. They have a distinct karyotype, membrane lipid composition, morphology and growth kinetics from the parental cell lines. In this paper, we report the development of ht cell lines from other insect species and examination of their growth characteristics and virus susceptibility. Adaptation of cell lines sf-9, BTI-TN-5B1-4 (High5) and BTI-TN-MG1 (MG1) to 33°C and 35°C was carried out by shifting the culture temperature between 28°C and higher temperatures by a gradual stepwise increase in temperature. The process of adaption to a higher culture temperature was accomplished over a period of 2 months. The cell lines with the temperature adaption were designated as sf9-ht33, sf9-ht35, High5-ht33, High5-ht35, MG1-ht33, MG1-ht35. These cell lines have been subcultured over 70 passages. Adaption to high temperatures was confirmed by a constant population doubling time with individual cell lines. The population doubling time of heat adapted cell lines were 1-4 h less than these of parental cell lines. Cell shapes did not show obvious change, however, the cell size of sf9-ht cells was enlarged and those of High5 and MG1 ht cells were reduced after heat adaption. When the cell lines were infected with Autographa californica nuclear polyhedrosis virus (AcMNPV) at 28°C, 33°C, 35°C and 37°C, production of budded virus and occlusion bodies in each cell line was optimum at its own adapted temperature.


Assuntos
Baculoviridae/fisiologia , Linhagem Celular/fisiologia , Lepidópteros/citologia , Animais , Técnicas de Cultura de Células , Linhagem Celular/química , Linhagem Celular/virologia , Temperatura Alta , Cinética , Lepidópteros/química
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...