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Content of dietary fibre and phenolic compounds in broccoli side streams

Berndtsson, Emilia (2020). Content of dietary fibre and phenolic compounds in broccoli side streams. Sveriges lantbruksuniv.
ISBN 978-91-576-9740-0
eISBN 978-91-576-9741-7
[Licentiate thesis]

[img] PDF - Published Version
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Abstract

Shortage of food is an alarming problem today, with up to 821 million people that are undernourished world-wide. At the same time, enough edible foodstuff to feed 1.9 billion people are wasted or lost in the food supply chain that for aesthetic reasons, handling and transportation inadequacies in the food supply chain and lack of market. In 2014, this wasted or lost food (including only commonly consumed plant parts) corresponded to 3.49 GT CO2 equivalents globally, which was more than half the total amount of emissions in the USA that year. This means that there is much biomass that could be valorised into nutritional food ingredients or used for extraction of health beneficial compounds, e.g. dietary fibre. Many consumers currently eat too little dietary fibre and phenolic compounds, which can lead to increased risk of developing some forms of cancer and cardiovascular diseases.

In this thesis, the content of dietary fibre and phenolic compounds in the broccoli leaves and stems was determined. The relationship between the dietary fibre and phenolic compounds in broccoli leaves was also analysed, since recent research indicates that interactions between these plant components may have an impact on the uptake in the human gastrointestinal tract. The results revealed that broccoli leaves contain similar levels of dietary fibre (26-32 % of dry weight (DW)) to cabbage, broccoli florets and kale leaves, which are regarded as beneficial to human health. The content of phenolic compounds (6.3-15.2 mg/g DW) in broccoli leaves was similar to that in kale leaves and much higher than that in broccoli florets. Some phenolic acids showed positive correlations with soluble dietary fibre in the broccoli leaves, but no correlation was found between the insoluble dietary fibre and phenolic compounds. A pilot study on field waste showed that leaves and stems of broccoli plants make up 43-87 % of total plant weight, indicating that substantial amounts of biomass are left in the field at harvest.

Overall, the analysis of this thesis showed that the broccoli leaves are interesting from a food ingredient perspective. Possible uses could be to add broccoli leaf powder to everyday food products, such as pasta or bread, or into gluten-free products to increase the nutritional and technical properties.

Authors/Creators:Berndtsson, Emilia
Title:Content of dietary fibre and phenolic compounds in broccoli side streams
Year of publishing :2020
Number of Pages:60
Publisher:Department of plant breeding, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-9740-0
ISBN for electronic version:978-91-576-9741-7
Language:English
Publication Type:Licentiate thesis
Article category:Other scientific
Version:Published version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Horticulture
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Food Science
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 405 Other Agricultural Sciences > Environmental Sciences related to Agriculture and Land-use
Keywords:broccoli, dietary fibre, field waste:food loss, food waste, health benefits, phenolic compounds
URN:NBN:urn:nbn:se:slu:epsilon-p-105333
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-105333
ID Code:16945
Faculty:LTV - Fakulteten för landskapsarkitektur, trädgårds- och växtproduktionsvetenskap
Department:(LTJ, LTV) > Department of Plant Breeding (from 130101)
Deposited By: SLUpub Connector
Deposited On:30 Apr 2020 10:32
Metadata Last Modified:08 Sep 2020 02:49

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