Valorization of red raspberry (Rubus idaeusL.) seeds as a source of health beneficial compounds: Extraction by different methods

Abstract

Fruit processing by-product, raspberry (Rubus idaeus L.) seeds were utilized to obtain health beneficial oils. Cold pressing (CP) and supercritical CO 2 extraction (SFE) were applied to separate oil from seeds. Raspberry seed oils were analyzed in terms of fatty acids (FA) content, tocopherols, and functional quality indices. The residues after extractions were analyzed in terms of free and total ellagic acid content (TEAC). CP provided higher extraction yield than the SFE method. Oils isolated by both methods have a significant amount of ω-3 FA, even though oil obtained by SFE had slightly higher ω-3 FA content. Furthermore, oils obtained with both extraction methods exhibited high values of tocopherol content. In terms of ellagic acid content, residues after SFE had higher values of free and TEAC than residues after CP. Practical applications Raspberry seeds are currently underutilized by-product of the fruit processing industry. These seeds could be further processed to obtain oil with high quantity of essential ω-3 fatty acid and polyphenol extracts with high content of ellagic acid. Isolated oil and phenolic extracts could be used in various food, cosmetic, and nutraceutical products to increase its nutritive composition and functional properties. Utilization of cold pressing (conventional extraction technique) and supercritical CO 2 extraction (novel and green extraction technique) for oil recovery in the same study enables a direct comparison of these techniques and reveals the advantages and disadvantages of supercritical CO 2 extraction for potential industrial application. How to cite this article: Marić B, Abramović B, Ilić N, et al. Valorization of red raspberry (Rubus idaeus L.

Simultaneous Hydrolysis of Ellagitannins and Extraction of Ellagic Acid from Defatted Raspberry Seeds Using Natural Deep Eutectic Solvents (NADES)

“…The concentration of ellagic acid (EA) in obtained samples was determined with a slightly modified method described elsewhere [ 2 ]. Briefly, before injection into the HPLC system, all extracts were adequately diluted with 80% ethanol ( w / w ) and filtered through a 0.45 µm membrane filter.…”

“…The processing of fresh raspberries during the production of jams, fruit pulp, juices, and other similar products generates a large number of seeds, which are currently underutilized in Serbia. The major constituents of raspberry seeds (RS) are dietary fibers (65.79 g/100 g), oil (14.90 g/100 g), and proteins (6.95 g/100 g) [ 2 ]. RS are also a rich source of secondary plant metabolites such as polyphenols which are present in free, soluble bond (esterified or glycosylated), and insoluble-bond forms [ 3 ].…”

Alternative Methods of Bioactive Compounds and Oils Extraction from Berry Fruit By-Products—A Review

“…This proves the better selectivity of SFE towards FAs. Marić et al [131] studied differences between cold pressing and SFE of raspberry seeds. A higher oil yield was reached when cold pressing was applied, and a lower tocopherol content was observed in oil obtained with SFE.…”

“…Flow rate: In the reviewed studies, oils were extracted more effectively when the flow rate was high enough to be diffusion-limited [88,[130][131][132]135]. However, this is connected with the increased amounts of solvents used in the process [136].…”

Communicating Function and Co-Creating Healthy Food: Designing a Functional Food Product Together with Consumers

“…Serbia is one of the largest world producers of raspberries ( Rubus idaeus L.) [ 29 ], and the processing of fresh raspberries into jams, fruit pulp, juices, and other similar products generates a large quantity of seeds, which are currently underutilized in Serbia. These raspberry seeds are often discarded as waste although they contain a considerable number of bioactive compounds, such as polyphenols, tocopherols, ω-3, and ω-6 fatty acids [ 30 ]. Due to relatively high content of bioactive compounds, high availability, and low market price in Serbia, raspberry seeds were identified as a sustainable alternative source of ellagic acid and other polyphenols with antioxidant and anti-proliferative properties [ 31 ].…”