Abstract
Encapsulation of bioactives is a tool to prepare their suitable delivery systems and ensure their stability. For this purpose, cellulose was selected as carrier of raspberry juice phenolics and freeze-dried cellulose/raspberry encapsulates (C/R_Es) were formulated. Influence of cellulose amount (2.5%, 5%, 7.5% and 10%) and time (15 or 60 min) on the complexation of cellulose and raspberry juice was investigated. Obtained C/R_Es were evaluated for total phenolics, anthocyanins, antioxidant activity, inhibition of α-amylase and color. Additionally, encapsulation was confirmed by FTIR. Stability of C/R_Es was examined after 12 months of storage at room temperature. Increasing the amount of cellulose during formulation of C/R_E from 2.5% to 10%, resulted in the decrease of content of total phenolics and anthocyanins. Additionally, encapsulates formulated by 15 min of complexation had a higher amount of investigated compounds. This tendency was retained after storage. The highest antioxidant activities were determined for C/R_E with 2.5% of cellulose and the lowest for those with 10% of cellulose, regardless of the methods used for its evaluation. After storage of 12 months, antioxidant activity slightly increased. Encapsulates with 2.5% of cellulose had the highest and those with 10% of cellulose the lowest capability for inhibition of α-amylase. The amount of cellulose also had an impact on color of C/R_Es. Results of this study suggest that cellulose could be a good encapsulation polymer for delivering raspberry bioactives, especially when cellulose was used in lower percentages for formulation of encapsulates.
Highlights
Published: 4 January 2021Recommendations of nutritionists are consumption of plant-based foods since this type of diet has been linked with a lowered occurrence of various types of degenerative diseases
Polyphenols are primarily located in the vacuoles but throughout harvesting, processing and consumption, they can interact with components of plant cell walls (PCWs)
In order to evaluate the possibility of preparation of freeze-dried cellulose-based encapsulates as delivery systems of raspberry phenolics, encapsulates were prepared by complexation of various amounts of cellulose with constant amount of raspberry juice
Summary
Published: 4 January 2021Recommendations of nutritionists are consumption of plant-based foods since this type of diet has been linked with a lowered occurrence of various types of degenerative diseases. Phenolic compounds and fibers have been highlighted as two major functional compounds responsible for prevention of different diseases [1]. Polyphenols were put forward as components that are related with antioxidant, anti-inflammatory, antimicrobial and antiproliferation activity as well as with reduction of diverse chronic diseases such as cardiovascular and neurodegenerative diseases, certain cancers, type II diabetes and osteoporosis [2,3,4]. The diverse effects of secondary plant metabolites are connected with different chemical structures of those compounds and their major categories include flavonoids, phenolic acids, lignans, coumarins, stilbenes and quinones [2]. Consumption of dietary fibers has been related with various health benefits such as decrease of risk of development of coronary heart disease, hypertension, diabetes, obesity as well as some gastrointestinal disorders [5].
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