Their main advantage is that they protect against numerous diseases such as cancer or cardiovascular disease. In particular, they help fight the formation of free radicals in the human body and thus slow cell ageing. They are found in many common consumer products, primarily in fruit and vegetables but also in processed products such as chocolate, tea or wine.
Nobody knew until now the precise total polyphenol content of different foods or the level of consumption in France. A composition table compiled by CIRAD and its partners now goes some way towards providing an answer to those questions. The table was produced under the French Research Ministry's Nutrialis programme. Researchers studied 162 samples from 24 vegetables and 71 samples from 28 fruits. The total polyphenol content of 85 tea samples was also analysed.
It is not always the fruits and vegetables with the highest polyphenol contents that are the most consumed
It is strawberries, lychees and grapes that have the highest polyphenol contents, but vegetables are not far behind, particularly artichokes, parsley and brussels sprouts. Moreover, the total amount consumed plays a considerable role. As Pierre Brat, a CIRAD biochemist, points out: "If we look at total polyphenol content in apples, they rank fifth compared to other fruits, but the extent of their consumption places them first!". Likewise, in terms of vegetables, potatoes rank just 19th, but their massive consumption means that they account for almost 60% of the polyphenols obtained from vegetables.
This was the aim of the table compiled by CIRAD and its partners: to set product composition against consumption. The working method used to do this is in itself a tangible result of the study. In effect, the researchers had to select a range of fresh fruits and vegetables that was representative of consumption in France. To this end, they took account of the different varieties eaten, the different production sites and countries and where those fruits and vegetables are purchased. Total polyphenol content was then analysed using a technique adapted from a chemical colorimetric assay method: the Folin Ciocalteu method. The researchers then established a relation between the result obtained and consumption levels. In this last stage, the team's links with the Agence française de sécurité sanitaire des aliments (AFSSA) proved crucial, since the researchers were able to use two AFSSA databases: one on food consumption - Suvimax - and the other - Secodip - on fresh fruit and vegetable purchases. Moreover, AFSSA will be making the table available to researchers and the general public on its website shortly.
Researchers are preparing to analyse the polyphenol content of processed products
This research is now continuing under a new project, Phenobase, coordinated by the Centre technique de la conservation des produits agricoles in Avignon, in which CIRAD is also involved. The aim is to supplement the composition table, this time by looking at the so-called "processed" products included in the daily diet in France.
Both these products have called upon CIRAD researchers' expertise, notably in terms of citrus fruit treatments. The method developed under the Nutrialis programme, for its part, is currently being disseminated to CIRAD's partners in developing countries.
Helen Burford | alfa
Forest Management Yields Higher Productivity through Biodiversity
14.10.2016 | Technische Universität München
Farming with forests
23.09.2016 | University of Illinois College of Agricultural, Consumer and Environmental Sciences (ACES)
Terahertz excitation of selected crystal vibrations leads to an effective magnetic field that drives coherent spin motion
Controlling functional properties by light is one of the grand goals in modern condensed matter physics and materials science. A new study now demonstrates how...
Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.
"The quantum socket is a wiring method that uses three-dimensional wires based on spring-loaded pins to address individual qubits," said Jeremy Béjanin, a PhD...
In a paper in Scientific Reports, a research team at Worcester Polytechnic Institute describes a novel light-activated phenomenon that could become the basis for applications as diverse as microscopic robotic grippers and more efficient solar cells.
A research team at Worcester Polytechnic Institute (WPI) has developed a revolutionary, light-activated semiconductor nanocomposite material that can be used...
By forcefully embedding two silicon atoms in a diamond matrix, Sandia researchers have demonstrated for the first time on a single chip all the components needed to create a quantum bridge to link quantum computers together.
"People have already built small quantum computers," says Sandia researcher Ryan Camacho. "Maybe the first useful one won't be a single giant quantum computer...
COMPAMED has become the leading international marketplace for suppliers of medical manufacturing. The trade fair, which takes place every November and is co-located to MEDICA in Dusseldorf, has been steadily growing over the past years and shows that medical technology remains a rapidly growing market.
In 2016, the joint pavilion by the IVAM Microtechnology Network, the Product Market “High-tech for Medical Devices”, will be located in Hall 8a again and will...
14.10.2016 | Event News
14.10.2016 | Event News
12.10.2016 | Event News
24.10.2016 | Earth Sciences
24.10.2016 | Life Sciences
24.10.2016 | Physics and Astronomy