New Ways to Evaluate the Quality of Vegetables Using Instruments

Ito, Hidekazu

doi:10.6090/jarq.48.111

Cited by 10 publications

(7 citation statements)

References 25 publications

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“…Nitrates in the different types of the samples can be determined by several analytical methods, namely by spectrophotometry, potentiometry, polarography, chromatography or capillary isotachophoresis [20][21][22][23][24]. Capillary isotachophoresis (cITP) is a nonlinear electrophoretic technique used for selective separation and concentration of ionic analytes.…”

Section: Methodsmentioning

confidence: 99%

Quality of Vegetables in Central Europe Region

Řezáčová¹,

Jancova²

2018

J Environ Sci Public Health

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The quality of vegetables can be assessed by numbers of viewpoints. One of them is the monitoring of the content of hazardous substances included nitrates. High nitrate levels cause methemoglobinemia or blue baby syndrome; a condition found especially including in infants under six months. Most of the nitrates we consume are from either raw or cooked vegetables. Healthy adults may consume fairly large amount of nitrates with few known negative health effects. However, a long-term intake of high amount of nitrates may result into various gastric problems because of the rapid reduction of nitrates to nitrites. Subsequently, the nitrites react with further secondary amines in the stomach which leads to a production of carcinogenic nitrosamines. This work deals with determination of nitrates in vegetables by capillary isotachophoresis. Samples of organic-labeled ("bio") vegetables as well as undistinguished vegetables were purchased in supermarkets and in farmer markets in Brno, Czech Republic. The amount of nitrates contained in the samples differed widely. The lowest content of nitrates was found bellow the limit of quantification. On the other hand only one of the samples exceeded the maximum amount of nitrates allowed by European Union legislation.

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Section: Methodsmentioning

confidence: 99%

Quality of Vegetables in Central Europe Region

Řezáčová¹,

Jancova²

2018

J Environ Sci Public Health

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“…As described in Sect. 1, calibration with various types of samples and a wide range of reference values leads to the derivation of more universal and accurate results, (17,25) and the limits of the method may also be found. In addition, we attempted to measure Vis-NIR spectra in not the reflectance (7,8,10,11,14) or diffuse reflectance mode (9,12,13,15,16) but the transmittance-reflectance mode.…”

Section: Optimal Wavelength For Predicting Tpp Contentmentioning

confidence: 99%

“…The powder of a standard reagent can be measured to visualize the absorption band; sucrose, glucose, and fructose have been measured for the non-destructive determination of soluble solids in some fruits (melons, tomatoes, compact watermelons, strawberries) using NIR spectroscopy. (17,26) The absorption band of the three sugars can be measured from 900 to 925 nm in the second derivative spectra, (26) and the combination of wavelengths around 902 nm and other several wavelengths can be used for the practical and non-destructive determination of soluble solids in fruits. (17) The main components of the soluble solids are these sugars.…”

Section: Optimal Wavelength For Predicting Tpp Contentmentioning

confidence: 99%

“…(17,26) The absorption band of the three sugars can be measured from 900 to 925 nm in the second derivative spectra, (26) and the combination of wavelengths around 902 nm and other several wavelengths can be used for the practical and non-destructive determination of soluble solids in fruits. (17) The main components of the soluble solids are these sugars. The absorption between 880 and 915 nm is generally assigned to the third overtone of the CH stretching vibration mode.…”

Section: Optimal Wavelength For Predicting Tpp Contentmentioning

confidence: 99%

“…(7) On the other hand, the soluble solids of tomatoes and strawberries, which have high water content, can be non-destructively determined using only three wavelengths in the short NIR range. (17) If samples are dry, the accuracy could be higher because no large peaks associated with water absorption will appear in their NIR spectra.…”

Section: Introductionmentioning

confidence: 99%

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NIR Spectroscopic Determination of Polyphenol Content in Teas and Tea Extract at 2142 nm

Ranatunga¹,

Uwadaira²,

Ikehata³

et al. 2021

Sensors and Materials

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Various teas, a tea extract, and a catechin mixture reagent were measured in transmittancereflectance mode using visible and NIR (Vis-NIR) spectroscopy. Total polyphenol (TPP) content in the tea samples was determined using Vis-NIR spectra. Then, reference TPP content was determined by the colorimetric ferrous tartrate method. Partial least squares (PLS) regression, a method of multivariate analysis, was performed in combination with various wavelength ranges and spectral pretreatments. Usually, multivariate analyses in which many independent variables are applied have been used for NIR data to obtain high accuracy for the determination. Nevertheless, surprisingly, only 2142 nm, which has high sensitivity and is in the NIR region, was identified for the determination of TPP content in various teas and tea extracts based on regression coefficient values, selectivity ratio (SR) values of the best PLS model [correlation coefficient (R = 0.98, n = 69)], correlation coefficients (a correlation spectrum) between the reference TPP content and Savitzky-Golay smoothing with the second derivatives (SG2D) with standard normal variate (SNV) preprocessing of raw spectra, and the peaks of the raw spectra and their SG2D with SNV. The R value between SG2D with SNV at 2142 nm and reference TPP content was 0.96 (n = 69).

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A comprehensive review on recent advances in postharvest treatment, storage, and quality evaluation of onion (Allium cepa): Current status, and challenges

Kiran,

Aradwad,

T. V.

et al. 2024

Future Postharvest and Food

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Onion is an important economical and nutritional vegetable crop having a global demand. However, the long‐term storage and availability of quality produce during off seasons remain a constraint. The intricate process of quality degradation in onions, both pre and postharvest, is influenced by internal factors and storage conditions. To preserve the postharvest quality and prolong the shelf life of onions, effective postharvest technologies incorporating quality assessment and preservation treatments are crucial. This paper delves into the key factors associated with crop quality, postharvest treatments, and storage, providing a comprehensive understanding of their cause‐effect relationships. The primary objective of this review is to shed light on diverse postharvest treatments, storage conditions, and structures, along with their effects on the physical, chemical, and biochemical aspects of onions. Additionally, the study explores destructive and non‐destructive assessment technologies to evaluate the quality of onions. Storage and marketability is intricately tied to the advancement of appropriate technology aimed at minimizing losses during various stages of harvesting and storage conditions. This review serves as a preliminary document that can assist in exploring critical factors and advancing technologies to enhance the shelf life and quality of onions, bridging the gap between traditional methods and promising advancements.

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New Ways to Evaluate the Quality of Vegetables Using Instruments

Cited by 10 publications

References 25 publications

Quality of Vegetables in Central Europe Region

Quality of Vegetables in Central Europe Region

NIR Spectroscopic Determination of Polyphenol Content in Teas and Tea Extract at 2142 nm

A comprehensive review on recent advances in postharvest treatment, storage, and quality evaluation of onion (Allium cepa): Current status, and challenges

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