Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Effect of Filtration Process on Oxidative Stability and Minor Compounds of the Cold-Pressed Hempseed Oil during Storage

Vincenzo Lo Turco
ORCID logo ,
Federica Litrenta
,
Vincenzo Nava
* ORCID logo ,
Ambrogina Albergamo
* ,
Rossana Rando
,
Giovanni Bartolomeo
ORCID logo ,
Angela Giorgia Potortì
ORCID logo ,
Giuseppa Di Bella
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Version 1 : Received: 10 April 2023 / Approved: 11 April 2023 / Online: 11 April 2023 (05:20:30 CEST)

A peer-reviewed article of this Preprint also exists.

Lo Turco, V.; Litrenta, F.; Nava, V.; Albergamo, A.; Rando, R.; Bartolomeo, G.; Potortì, A.G.; Di Bella, G. Effect of Filtration Process on Oxidative Stability and Minor Compounds of the Cold-Pressed Hempseed Oil during Storage. Antioxidants 2023, 12, 1231. Lo Turco, V.; Litrenta, F.; Nava, V.; Albergamo, A.; Rando, R.; Bartolomeo, G.; Potortì, A.G.; Di Bella, G. Effect of Filtration Process on Oxidative Stability and Minor Compounds of the Cold-Pressed Hempseed Oil during Storage. Antioxidants 2023, 12, 1231.

Abstract

The cold-pressed hempseed oil (HO) has been increasingly exploited in human diet for its excellent nutritional and healthy properties. However, it has a high content of polyunsaturated fatty acids (PUFAs) and chlorophylls, which inevitably accelerate its oxidative deterioration, especially in presence of light. In this scenario, the filtration technology may ameliorate the oxidative stability of the oil, with positive effects on its nutritional quality and shelf-life. Therefore, in this study, the oxidative stability and minor compounds of non-filtered and filtered HO (NF-HO and F-HO) were monitored over 12 weeks of storage in transparent glass bottles. F-HO showed a better hydrolytic and oxidative status than NF-HO during storage. As a result, F-HO displayed also a better preservation of total MUFA and PUFA in the autoxidation process. Filtration consistently reduced chlorophylls, thus, causing a variation of the natural color of HO. Accordingly, F-HO not only revealed an increased resistance to photooxidation but was also suitable for storage in clear bottles within 12 weeks. F-HO predictably showed lower carotenoids, tocopherols, polyphenols, and squalene compared to NF-HO. However, filtration appeared to play a “protective role” toward these antioxidants, which had lower degradation rates in F-HO than NF-HO for 12 weeks. Interestingly, the element profile of HO was not affected by filtration and remained stable during the study period. Overall, this study may be of practical use to both producers and marketers of cold-pressed HO.

Keywords

hempseed oil; cold-pressed oils; oxidative stability; minor compounds; filtration process; storage

Subject

Chemistry and Materials Science, Food Chemistry

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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