scholarly journals Optimalization of multiresidue method for the determination of pesticide residues in fruits

2021 ◽  
Vol 61 (3) ◽  
pp. 221-238
Keyword(s):  
Water Content ◽  
Pesticide Residues ◽  
High Water ◽  
High Water Content ◽  
Detector Response ◽  
Wide Range ◽  
Comprehensive Determination ◽  
Selective Detectors ◽  
Active Substances

The main aim of this study was to optimize the QuEChERS methodology for the comprehensive determination of pesticide residues using a simple and inexpensive gas chromatography equipped with selective detectors working simultaneously (GC-ECD/NPD). The method was validated in accordance with the SANTE/11945/2015 guidelines. Representative fruit matrices were chosen from the commodities group with high water content (apples), and with high acidity and high water content (strawberry) for a 160 compounds in the range of 0.005−0.02 mg/kg. The accuracy of the method was as required (recovery: 70–120%, precision: below 20%) for 135 active substances in apples samples and 137 in strawberries samples. The main advantages of the methodology include: good detector response linearity (R2 above 0.995), low limits of detection (0.005 mg/kg for more than 20 compounds, 0.01 mg/kg for about 120 compounds), possibility of simultaneous determination of a wide range of compounds (including some “difficult” ones) without use of a single residue methods. The simultaneous use of two selective detectors allows to obtain more data during a single dose of the sample and confirmation of the result for most compounds, which allows to prevent false positives ones.

scholarly journals Determination of Selected Priority Pesticides in High Water Fruits and Vegetables by Modified QuEChERS and GC-ECD with GC-MS/MS Confirmation

Molecules ◽  
2019 ◽  
Vol 24 (3) ◽  
pp. 417 ◽  
Author(s):  
Maciej Tankiewicz
Keyword(s):  
Water Content ◽  
Fruits And Vegetables ◽  
High Water ◽  
International Agency ◽  
High Water Content ◽  
Vegetable Crops ◽  
Fruit And Vegetable ◽  
Quechers Method ◽  
Relative Standard

A modified quick, easy, cheap, efficient, rugged and safe (QuEChERS) method coupled to gas chromatography with electron capture detector (GC-ECD) was developed for simultaneous determination of selected electronegative pesticides in fruits and vegetables with high water content. The chosen compounds are commonly detected in fruit and vegetable crops, and some of their metabolites have even been found in human urine. In addition, some of them are known or suspected carcinogens according to the International Agency for Research of Cancer. Extraction and clean up parameters were optimized, thus the original QuEChERS method was modified to decrease solvent usage, in accordance with ‘green chemistry’ principles. The proposed methodology was validated in terms of selectivity, specificity, linearity, precision and accuracy. The obtained limits of detection (LODs) for all investigated pesticides ranged from 5.6 µg·kg−1 to 15 µg·kg−1 and limits of quantification (LOQs) from 17 µg·kg−1 to 45 µg·kg−1. The obtained data demonstrated the good reproducibility and stability of the procedure in the tested concentration range up to 10 mg·kg−1, with relative standard deviations (RSDs) lower than 10%. Recoveries for spiked pear samples at LOQ level for each pesticide were from 90% to 107% with RSDs lower than 9.6%. The suitability of the developed procedure was tested on various fruit and vegetable samples available on the market at different seasons. The proposed methodology is applicable for detection and monitoring of selected pesticides not only in fruits and vegetables with high water content, but also in samples containing large amounts of pigments and dyes.

Fluorescence sensors for detection of water based on tetraphenylethene–anthracene possessing both solvatofluorochromic properties and aggregation-induced emission (AIE) characteristics

2021 ◽  
Vol 45 (9) ◽  
pp. 4164-4173
Author(s):  
Yuta Mise ◽  
Keiichi Imato ◽  
Takashi Ogi ◽  
Nao Tsunoji ◽  
Yousuke Ooyama
Keyword(s):  
Water Content ◽  
High Water ◽  
Fluorescence Sensor ◽  
High Water Content ◽  
Fluorescence Sensors ◽  
Aggregation Induced Emission ◽  
Emission Enhancement ◽  
Wide Range ◽  
Water Based

TPE-(An-CHO)4 has been developed as an SFC (solvatofluorochromism)/AIEE (aggregation-induced emission enhancement)-based fluorescence sensor for detection of water over a wide range from low to high water content regions in solvents.

QuEChERS Approach for the Determination of Biopesticides in Organic and Nonorganic Vegetables and Fruits by Ultra-Performance Liquid Chromatography/Tandem Mass Spectrometry

2014 ◽  
Vol 97 (4) ◽  
pp. 1027-1033 ◽  
Author(s):  
Roberto Romero-González ◽  
Patricia Plaza-Bolaños ◽  
Rocío I Limón-Garduza ◽  
José L Martínez-Vidal ◽  
Antonia Garrido Frenich
Keyword(s):  
Water Content ◽  
Organic Farming ◽  
High Water ◽  
Ultra Performance Liquid Chromatography ◽  
High Water Content ◽  
Chromatography Tandem Mass Spectrometry ◽  
Liquid Chromatography Tandem Mass ◽  
Food Commodities ◽  
Vegetables And Fruits

Abstract A method for the determination of 14 biopesticides and piperonyl butoxide (PBO), often applied in organic farming, in vegetables and fruits has been developed. Extraction was performed using the Quick, Easy, Cheap, Effective, Rugged, and Safe method, and the determination was carried out by ultra-performance LC/MS/MS in 9 min. Several different food commodities were evaluated as representative matrixes, namely, cucumber, tomato, pepper (high water content), and strawberry and orange (high acid and water content). Biopesticides were quantified using matrix-matched calibration, and the optimized method was validated at three concentration levels, i.e., 10, 50, and 100 μg/kg, for all the compounds, yielding recoveries in the range 70–112%, 71–112%, and 70–109%, respectively, with RSDs <28%. LOQs were <3 μg/kg for all biopesticides. The validated procedure was applied to the analysis of vegetables and fruits, including products from organic farming; PBO was detected in one sample at 8 μg/kg.

scholarly journals Oxidation Lipid on Fish Cake Catfish (Pangasius sp.) Dissolved in The Extract of Bay Leaf (Eugenia polyantha)

2020 ◽  
Vol 8 (3) ◽  
pp. 91
Author(s):  
Mahiastuti Tribuana Tungga Dewi ◽  
Boedi Setya Rahardja ◽  
Agustono Agustono
Keyword(s):  
Water Content ◽  
Natural Antioxidants ◽  
High Water ◽  
Experimental Methods ◽  
Quality Score ◽  
High Water Content ◽  
Antioxidant Compounds ◽  
White Meat ◽  
Wide Range ◽  
Significant Difference

Catfish (Pangasius sp.) As a source of animal protein. Fish catfish have a thick white meat so that it can be processed into a wide range of diversified products. The process of fried fish cake can result in fat or autooxidation process. Autooxidation can be inhibited by the presence of antioxidant compounds. One source of natural antioxidants are bay leaf Eugenia polyantha.This research was carried out by experimental methods and the use of experimental design of randomized Complete Design (RAL). RAL is used when the material and condition of the experiment are homogeneous. This research consists of four concentrations of extract treatment bay leaf, namely 0%, 10%, 20%, 30%. Fish cake has been fried done soaking for 30 minutes. Water content showed no significant difference (p> 0.05) at 24 hours to 28, this indicated that the addition of bay leaf extract did not affect the moisture content during storage. The high water content at 0 hour is caused by the process of soaking the fish cake  in the extract solution. The highest value is shown by the concentration of 30% at the hour to 0 that is 52.78%, this indicates that the fish cake by soaking can meet the quality score SNI 7757:2013 which is a maximum of 60%. The fat content in the fish cake continues to decrease, indicating the occurrence of oxidation during storage. Levels of TBA in fish cake continue to increase that can be slowed by the extract of bay leaves with a concentration of 30%.

scholarly journals Principles of Irrigation Management for Vegetables

2021 ◽  
Author(s):  
Selda Ors ◽  
Ustun Sahin ◽  
Melek Ekinci ◽  
Metin Turan ◽  
Ertan Yildirim
Keyword(s):  
Water Content ◽  
Irrigation System ◽  
Irrigation Management ◽  
High Water ◽  
Irrigated Agriculture ◽  
High Water Content ◽  
Yield And Quality ◽  
Vegetable Soil ◽  
Management Concept

Vegetables have a very high percentage of water content. Some of the vegetables, such as cucumber, tomato, lettuce, zucchini, and celery contain over ninety-five percent of water. As a result of the high-water content in the cells, they are extremely vulnerable plants to water stress and drought conditions. Their yield and quality are affected rapidly when subjected to drought. Therefore, irrigation is essential to the production of most vegetables in order to have an adequate yield with high quality. However, over-irrigating can inhibit germination and root development, decrease the vegetable quality and post-harvest life of the crop. Determination of suitable irrigation systems and scheduling to apply proper amount of water at the correct time is crucial for achieving the optimum benefits from irrigation. This determination requires understanding of the water demand of the vegetable, soil characteristics, and climate factors. All these factors have major impact for the success and sustainability of any vegetable irrigation. This section contains fundamentals of water requirements on different vegetables and summarizes important issues related to soil, water, and vegetable growth relations together with irrigation management concept by evaluating the challenging issues on the selection of proper irrigation system, suitable irrigation timing, and other parameters to increase vegetable yield in an irrigated agriculture.

Sign in / Sign up

Export Citation Format

Share Document