Effects of ultrasound treatments on quality of grapefruit juice
TL;DR: Overall quality of grapefruit juice was improved, suggesting that sonication technique may successfully be implemented an industrial scale for the processing of Grapefruit juice.
About: This article is published in Food Chemistry.The article was published on 2013-12-01. It has received 276 citations till now. The article focuses on the topics: Grapefruit juice & Ascorbic acid.
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TL;DR: In this paper, the principles, mechanisms and effects of ultrasound on fruits and vegetables as a sanitization technology are discussed, which can be used in the food industry alone or associated with chemical sanitizers.
225 citations
TL;DR: The effects of US are usually highly variable, not only according to treatment duration and intensity, but also according to the food matrix, suggesting that each matrix should be studied and evaluated separately.
221 citations
TL;DR: It is demonstrated that ultrasound processing increase the availability of carotenoids, total phenols and RAE in Cape gooseberry juice.
187 citations
Cites methods from "Effects of ultrasound treatments on..."
...Total phenolic content 100 The total phenolic content of juice samples was determined using the Folin-Ciocalteu method 101 according to the method of Aadil et al. (2013)....
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TL;DR: The developed ultrasound-assisted extraction methods showed high reproducibility and repeatability and were successfully applied to real samples in order to investigate the presence of anthocyanins and total phenolic compounds in several mulberry jams.
160 citations
TL;DR: Efficiency enhancements and quality improvements in products (and extracts) using ultrasound are discussed in terms of mechanism and principles for a range of food-matrix categories, while efforts to improve existing ultrasound-assist patterns was also seen.
160 citations
References
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TL;DR: The phosphomolybdenum method is routinely applied in the laboratory to evaluate the total antioxidant capacity of plant extracts and to determine vitamin E in a variety of grains and seeds, including corn and soybean.
4,644 citations
TL;DR: Several high-quality investigations have examined the relationship between flavonoid structure and antibacterial activity and these are in close agreement, and future studies may allow the development of a pharmacologically acceptable antimicrobial agent or class of agents.
3,630 citations
TL;DR: High activities were found in tree materials, especially in willow bark, spruce needles, pine bark and cork, and birch phloem, and in some medicinal plants including heather, bog-rosemary, willow herb, and meadowsweet and potato peel and beetroot peel extracts showed strong antioxidant effects.
Abstract: The antioxidative activity of a total of 92 phenolic extracts from edible and nonedible plant materials (berries, fruits, vegetables, herbs, cereals, tree materials, plant sprouts, and seeds) was examined by autoxidation of methyl linoleate. The content of total phenolics in the extracts was determined spectrometrically according to the Folin-Ciocalteu procedure and calculated as gallic acid equivalents (GAE). Among edible plant materials, remarkable high antioxidant activity and high total phenolic content (GAE > 20 mg/g) were found in berries, especially aronia and crowberry. Apple extracts (two varieties) showed also strong antioxidant activity even though the total phenolic contents were low (GAE < 12.1 mg/g). Among nonedible plant materials, high activities were found in tree materials, especially in willow bark, spruce needles, pine bark and cork, and birch phloem, and in some medicinal plants including heather, bog-rosemary, willow herb, and meadowsweet. In addition, potato peel and beetroot peel extracts showed strong antioxidant effects. To utilize these significant sources of natural antioxidants, further characterization of the phenolic composition is needed.
3,612 citations
"Effects of ultrasound treatments on..." refers background in this paper
...Phenolic compounds are one of the main contributors in antioxidant activity in fruit juices and polyphenolic compounds are commonly found in both edible and inedible plants which have been reported to have multiple biological effects and antioxidant activities (Van Acker et al., 1996; Kähkönen et al., 1999)....
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Journal Article•
TL;DR: In this article, a 40-sample/hour procedure was adapted from the Singleton-Rossi method of analysis for total phenols in wine and other plant extracts, and compared with small-volume manual and semi-automated versions of this analysis.
Abstract: A fully automated-continuous flow 40-sample/ hour procedure was adapted from the Singleton-Rossi method of analysis for total phenols in wine and other plant extracts. It was compared with small-volume manual and semiautomated versions of this analysis. The agreement in mg of gallic acid equivalent phenol (GAE) per liter among a series of dry wines was excellent by all three procedures. The coefficients of variation in replicate analyses averaged 5.8% for the manual, 6.2% for the semi-automated and 2.2% for the automated procedure. This greater reproducibility, plus savings of about 70% in labor and up to 40% in reagents, makes the automated procedure attractive for laboratories doing enough total phenol analyses to recoup the cost of the automating equipment. For continuous flow, color development with the Folin-Ciocalteu reagent in alkaline solution must be hastened by heating compared to slower room temperature development for the manual methods. Heating of sugar-containing samples in the alkaline solution gives interference presumably from endiol formation. Examples are given of corrections which were used successfully to estimate the true phenol content of sweet wines.
3,527 citations
TL;DR: In this article, the authors performed polyphenolic phytochemical extractions of six plums (Beltsville Elite B70197, Cacak Best, French Damson, Long John, Stanley, and Gala apples) using 80% aqueous methanol with ultrasound assistance and extracts were analyzed for total phenolics, flavonoids and antioxidant capacity.
1,473 citations