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:
Turning carbon dioxide into liquid fuel
06.08.2020 | DOE/Argonne National Laboratory
Tellurium makes the difference
06.08.2020 | Friedrich-Schiller-Universität Jena
Scientists at the Fraunhofer Institute for Laser Technology ILT have come up with a striking new addition to contact stamping technologies in the ERDF research project ScanCut. In collaboration with industry partners from North Rhine-Westphalia, the Aachen-based team of researchers developed a hybrid manufacturing process for the laser cutting of thin-walled metal strips. This new process makes it possible to fabricate even the tiniest details of contact parts in an eco-friendly, high-precision and efficient manner.
Plug connectors are tiny and, at first glance, unremarkable – yet modern vehicles would be unable to function without them. Several thousand plug connectors...
An international research team has found a new approach that may be able to reduce bone loss in osteoporosis and maintain bone health.
Osteoporosis is the most common age-related bone disease which affects hundreds of millions of individuals worldwide. It is estimated that one in three women...
Traditional single-cell sequencing methods help to reveal insights about cellular differences and functions - but they do this with static snapshots only...
“Core-shell” clusters pave the way for new efficient nanomaterials that make catalysts, magnetic and laser sensors or measuring devices for detecting electromagnetic radiation more efficient.
Whether in innovative high-tech materials, more powerful computer chips, pharmaceuticals or in the field of renewable energies, nanoparticles – smallest...
An international research team with Prof. Cornelia Denz from the Institute of Applied Physics at the University of Münster develop for the first time light fields using caustics that do not change during propagation. With the new method, the physicists cleverly exploit light structures that can be seen in rainbows or when light is transmitted through drinking glasses.
Modern applications as high resolution microsopy or micro- or nanoscale material processing require customized laser beams that do not change during...
23.07.2020 | Event News
21.07.2020 | Event News
07.07.2020 | Event News
06.08.2020 | Earth Sciences
06.08.2020 | Power and Electrical Engineering
06.08.2020 | Life Sciences