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CNAA / Theses / 2022 / June /

Stabilization of vegetable oils with biologically active compounds from renewable sources


Author: Popovici Violina
Degree:doctor of engineering
Speciality: 05.18.03 - Technology of storage and processing of vegetable products
Year:2022
Scientific adviser: Rodica Sturza
doctor habilitat, professor, Technical University of Moldova
Institution: Technical University of Moldova

Status

The thesis was presented on the 17 June, 2022
Approved by NCAA on the 30 September, 2022

Abstract

Adobe PDF document – 2.15 Mb / in english
Adobe PDF document – 2.16 Mb / in romanian

Thesis

CZU 665.347.8:[634.743+634.17+582.734.4](043)

Adobe PDF document 5.79 Mb / in romanian
157 pages

Keywords

vegetable oil, lipophilic extract, oxidative stability, complex foods, quality

Summary

ANNOTATION Popovici Violina: Stabilization of vegetable oils with biologically active compounds from renewable sources, doctoral thesis, Chisinau, 2022. Thesis structure: consists of introduction, 4 chapters, conclusions and recommendations, bibliography with 291 titles 3 annexes. The basic text contains 112 pages, including 41 figures and 38 tables. The obtained results are published in 23 scientific papers. Key-words: vegetable oil, lipophilic extract, oxidative stability, complex foods, quality The purpose of the work: consists in elucidating the chemical changes that take place during lipid oxidation, stabilizing vegetable oils and evaluating the impact of lipophilic extracts on the oxidative stability of complex foods by optimizing manufacturing technology. The research objectives include: obtaining lipophilic extracts from local renewable plant sources, determining quality indicators, chromatic parameters and antioxidant activity; elaboration of technologies for manufacturing complex food products; determination of quality indicators, chromatic parameters, bioavailability of biologically active compounds and antioxidant activity. The scientific novelty and originality consists in arguing the possibility of using bioactive compounds from renewable sources of sea buckthorn, hawthorn, rosehip, identifying the optimal conditions for obtaining lipophilic extracts from local plant sources with increased antioxidant potential; arguing the possibility of using lipophilic extracts and local vegetable powders to obtain complex foods. Main results: It was shown that the autoxidation process that takes place during storage of vegetable oil and are formed more than 60 low molecular weight aldehydes. It was argued the possibility of using biologically active compounds from renewable plant sources of local origin to obtain lipophilic extracts with increased antioxidant potential; the influence of lipophilic extracts on the oxidative stability of vegetable oils was elucidated; the antioxidant activity was determined, the CIELab chromatic parameters, the quality indicators of the lipophilic extracts; new scientific information has been obtained on the mechanism and dynamics of the formation of lipid oxidation products during oxidative processes; complex food manufacturing technologies have been developed to determine quality parameters; the oxidative stability over time of the complex foods obtained was evaluated and it was found that the plant powder provides the antioxidant potential necessary to slow down the lipid oxidation in the composition of the complex products. Theoretical significance: For the first time, the methodology for stabilizing vegetable oils from local renewable sources was developed; oils with lipophilic extracts were obtained from local plant sources with increased antioxidant potential; For the first time, tandem mass spectrometry was used to establish the dynamics of the formation of lipid peroxidation products. Applicative value: Procedures for obtaining and stabilizing vegetable oils have been proposed and performed; complex food manufacturing technologies. 1 patent was obtained and 1 patent application was registered. Implementation of scientific results: The research results were implemented at LTD "Rose Line", Țaul, Dondușeni.