But the results of the PlantPro research project show that there are many more plants which are suitable for the production of protein compounds as food supplements.
ttz Bremerhaven examined 20 plants amongst which lentils and white beans particularly stood out due to their content in terms of nutritional physiology and their excellent functional features. The magazine "European Food Research and Technology" has just published an article in its web edition by Marie Bildstein, Dr. Mark Lohmann, Caroline Hennings and Dr. Hauke Hilz, scientists at ttz Bremerhaven, which gives a first detailed synopsis of the results. Co-author Alexander Krause, Managing Director of Gewürzmühle Nesse GmbH, a firm taking part in the project, was particularly interested in putting these results into practice in an efficient and economical way.
High nutritional value and more moist baked goods
Parallel to the growing demand for animal protein, the availability of this type of protein has also improved continuously over the last 40 years. The market will however reach the limit of its growth potential in the foreseeable future. In order to continue to satisfy demand, the search for sources of well-tolerated and low-fat protein compounds is very important. To date, soy beans and peas have been the main suppliers of vegetable protein. However, their utilisation is looked at with a critical eye or even boycotted in view of an increasing use of genetic engineering. In addition, a large number of consumers suffer an allergic reaction if they frequently eat soy products or milk proteins (caseins). Other pulses, such as lentils or white beans, have proven to cause less allergies.
Gentle protein extraction with water
Various types of plants have a high protein content - mostly in a concentrated form in their seeds. In the PlantPro project, which was funded by the German Ministry of Education and Research, ttz Bremerhaven, together with Gewürzmühle Nesse and a partner from Israel, extracted proteins from 20 different plants which so far have scarcely been used as a source of protein. A gentle extraction method using water was developed and deployed at an ideal temperature and pH value. However, since the tough cell wall structures and starch content made extraction difficult, the scientists were only able to recover very small yields.
Enzymes increase yield by 19 percent
The food technologists therefore incorporated an intermediate stage into the extraction process where selected enzymes were added to the solution. "The enzymes split the starch and, in so doing, improve the extraction of the proteins. In the case of white beans and lentils, this process increases the yield by 19 percent by adding the enzyme glucoamylase", explains Marie Bildstein, the Project Manager at ttz Bremerhaven. The optimum constellation of the factors of reaction time, concentration of the raw material and the enzyme, pH value and temperature also contributed to optimising the result. In order to obtain the extract in a powder form and to be able to process it further in a wide variety of ways, the extract passes through the following process stages after separation: Dissolution, filtration and, finally, spray drying.Comparison of nutritional value and functionality
In the case of the following features, the protein extract from lentils or white beans scores better than reference products from soy or peas:
- Foam formation and foam stability which are important for achieving a firm structure in foodstuffs
- Gel-forming characteristics
- Heat resistance
In a comparison of emulsion stability, the extract achieves the same result as alternatives from soy or peas. An important indicator for the quality of a product in terms of its nutritional physiology is the PDCAAS (Protein Digestibility Corrected Amino Acid Score). This value indicates to what degree a protein corresponds to the optimum protein in terms of nutritional physiology (set at 100). The PDCAAS of lentil protein was 51 percent, that of white beans 65 percent. By comparison, soy achieves a value of 91 percent and wheat protein 42 percent. Extracts from lentils and beans therefore produce a mid-range PDCAAS value.
Improved quality of baked goods
The use of protein extract from lentils and white beans in the production of white bread results in a crumb with a coarser pore structure. The quality and appearance of the white bread improve through this structure since the bread can bind more moisture. The bread keeps longer as a result. Thanks to the softer and more moist mouth feel, the consumer rates the bread as "fresher".Contact:
Gene therapy shows promise for treating Niemann-Pick disease type C1
27.10.2016 | NIH/National Human Genome Research Institute
'Neighbor maps' reveal the genome's 3-D shape
27.10.2016 | International School of Advanced Studies (SISSA)
Ultrafast lasers have introduced new possibilities in engraving ultrafine structures, and scientists are now also investigating how to use them to etch microstructures into thin glass. There are possible applications in analytics (lab on a chip) and especially in electronics and the consumer sector, where great interest has been shown.
This new method was born of a surprising phenomenon: irradiating glass in a particular way with an ultrafast laser has the effect of making the glass up to a...
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...
14.10.2016 | Event News
14.10.2016 | Event News
12.10.2016 | Event News
27.10.2016 | Life Sciences
27.10.2016 | Life Sciences
27.10.2016 | Power and Electrical Engineering