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Myrtle Leaves (Myrtus communis L) and Olive Leaves (Olea europaea): Effect of Drying by Fluidization and Solar Methods on Key Bioactive Compounds Contents

Lekrati Mounia, Elfazazi Kaoutar, Laaraj Salah, Zerrouk Latifa, El Madani Saad

Ecological Engineering & Environmental Technology

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2024

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Vol. 25, iss. 2

210--217

EN

The present study aimed to evaluate the influence of drying by fluidization technology, compared to a traditional solar drying, on phenolic compounds of Moroccan Myrtus communis L. and Olea europaea L. species. Two main parameters of drying by fluidization (air speed (0.3-1 m/s for myrtle leaves and 1-3 m/s for olive leaves) and air temperature (40-60 °C for the two plants leaves)) were modified and controlled. Results showed that high loss values in total polyphenols (TPP) and flavonoids (TF) were observed at (60 °C; 0.3 m/s) for myrtle leaves and at (60 °C; 1 m/s) for olive leaves. However, these compounds were more stable at (40 °C; 1 m/s) for myrtle leaves and at (40 °C; 3 m/s) for olive leaves. Regarding the solar drying method, the results showed that, for myrtle leaves, high losses were observed in the TPP and TF contents, compared to the fluidization method for all processing parameters. For olive leaves, traditional solar drying gives products with phenolic contents similar to those obtained by fluidization drying, especially at (60 °C; 3 m/s). The findings indicated that employing the fluidization drying method might be a suitable approach for enhancing the conservation of bioactive compounds within myrtle and olive leaves.

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Wpływ metody suszenia na zawartość polifenoli ogółem, chlorofili i witaminy C w kolendrze siewnej (Coriandrum sativum L.)

Kwaśniewska-Karolak Izabela

Przemysł Spożywczy

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2023

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T. 77, nr 1

15--18

PL

Przyprawy i zioła stanowią ważny element w diecie człowieka. Charakteryzują się wysokimi walorami smakowo-aromatycznymi oraz właściwościami leczniczymi. Zbadano wpływu metod suszenia (suszenie sublimacyjne oraz konwekcyjne) na zawartość związków aktywnych (kwasu askorbinowego, polifenoli oraz chlorofili) w kolendrze. Zakres pracy obejmował analizę ziela w trzech postaciach (świeżej, suszonej konwekcyjnie oraz sublimacyjnie) pod kątem zawartości suchej masy, zawartości barwników chlorofilowych, zawartości sumy związków polifenolowych oraz aktywności przeciwutleniającej metodą z rodnikiem DPPH. W wyniku prowadzonych analiz stwierdzono, że procesy suszenia spowodowały wzrost zawartości polifenoli w porównaniu do ziół świeżych oraz znaczne obniżenie dawki powodującej 50% redukcję rodnika DPPH w porównaniu do świeżego surowca. Największą zawartością barwnika chlorofilowego i kwasu askorbinowego charakteryzowała się świeża kolendra. Suszenie ziół spowodowało znaczny spadek zawartości barwników i witaminy C, przy czym większe ubytki zaobserwowano w przypadku ziół suszonych metodą konwekcyjną w porównaniu z sublimacyjną. Tym samym stwierdzono, że bardziej korzystną metodą utrwalania ziół jest metoda suszenia sublimacyjnego.

EN

Spices and herbs are important elements in the human diet. They are characterized by strong, taste aromatic values and therapeutic properties. The aim of the study was to investigate the effect of drying methods (freeze-drying and convection drying) on the content of active compounds such as ascorbic acid, polyphenols, and chlorophylls in coriander herb. The scope of the work included the analysis of herbs in three forms (fresh, dried, and freeze-dried) in terms of dry matter content, chlorophyll dyes content, total polyphenolic compounds content and antioxidant activity using the DPPH radical method. As a result of the conducted analyzes, it was found that applied drying processes caused an increase in the content of polyphenols compared to fresh herbs and a significant reduction in the dose resulting in a 50% reduction of the DPPH radical compared to the fresh raw material. Fresh coriander herb was characterized by the highest content of chlorophyll dye and ascorbic acid. Drying of herbs resulted in a significant decrease in the content of dyes and vitamin C, with greater losses observed in the case of herbs dried using the convection method. Thus, it was found that the freeze-drying is a more advantageous method of herb preservation.

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Effect of 1-methylcyclopropene and ULO conditions on bioactive composition and organoleptic properties of apples during storage

Wichrowska Dorota

Infrastruktura i Ekologia Terenów Wiejskich

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2023

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nr I/1

221--239

EN

The aim of this study was to analyze the effect of the use of an agent inhibiting ethylene release - 1-Methylcyclopropene in the storage of selected apple varieties ‘Szampion’, ‘Gloster’, ‘Elstar’, ‘Ligol’, ‘Idared’, ‘Jonagold’, and ‘Honeygold’ originating from orchards of the Fruit Plant in Wtelno and stored in chambers with a controlled atmosphere. Laboratory analyzes were performed immediately after harvest and after 6 months of storage in chambers under ULO conditions (<2% O2, <2%CO2) at a temperature of 1.5-2.0°C and relative air humidity of 95-96%. Fruits treated with 1-MCP were characterized by significantly lower losses of bioactive compounds, especially vitamin C, compared to untreated apples. The contents of total polyphenols and chlorogenic acid remained at a similar level as after harvest in untreated apple samples. After the storage period, the ‘Szampion’ variety contained significantly the most polyphenolic compounds, and the least - the ‘Honeygold’ variety, where the highest decrease was also recorded during storage (26.7%) in fruits not treated with 1-MCP. After storage, the ‘Ligol’ and ‘Elstar’ cultivars had the significantly highest content of chlorogenic acid. The highest losses of chlorogenic acid during apple storage (32.4%) were observed in the ‘Honeygold’ variety. The lowest loss of ascorbic acid during apple storage ((34.9%) was observed in the ‘Idared’ variety, and the highest loss in the ‘Honeygold’ variety (66.8%).

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Impact of different packaging systems on selected antioxidant properties of frozen-stored broccoli

Kapusta-Duch Joanna, Leszczyńska Teresa, Borczak Barbara, Florkiewicz Adam, Ambroszczyk Anna

Ecological Chemistry and Engineering. S

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2019

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Vol. 26, nr 2

383--396

EN

Broccoli has a very good nutritive value, high antioxidant activity and pro-healthy potential. Freezing is one of best methods for vegetable storage and broccoli belongs to the group of vegetables subjected to this process on an industrial scale. This work investigates the effect of type of container: low density polyethylene (PE-LD) bags and oriented polystyrene (OPS) boxes on selected quality parameters in frozen broccoli. The experimental material was the broccoli cultivar LordF1. The vegetable was subjected to blanching, freezing and 3-month storage. At the every stage of an experiment the material was examined in terms of: vitamin C content; β-carotene; total polyphenols; and antioxidant potential, which was determined basing on the ability to quench the ABTS˙+ free radical. It has been found that vegetables which were kept frozen for 3 months in two types of container had parallel levels of vitamin C, β-carotene; total polyphenols; and similar antioxidative potential.

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Nalewki aroniowe wzbogacane przyprawami

Sokół-Łętowska A., Kucharska A. Z., Nawirska-Olszańska A.

Przemysł Spożywczy

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2011

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T. 65, nr 9

42-44

PL

Celem pracy była ocena wpływu dodatku goździków, cynamonu i imbiru na zawartość polifenoli, antocyjanów, aktywność przeciwutleniającą wobec rodników DPPH oraz barwę nalewek aroniowych. Dodatek alkoholowego wyciągu z goździków najkorzystniej wpłynął na ilość polifenoli i aktywność przeciwutleniającą nalewek aroniowych. Aktywność przeciwutleniająca nalewek była najwyższa w wariantach, w których wykorzystano alkoholowe wyciągi przypraw.

EN

The aim of study was to estimate of influence of the addition of ginger, cinnamon and cloves on the content of polyphenols and anthocyanates and antiradical activity against DPPH radicals and on the colour of chokeberry liqueurs. The most beneficial influence on total phenolic and antiradical activity was shown in liqueurs produced with alcoholic extract from cloves. Antiradical activity was the highest in those variants in which alcoholic extracts from spices were utilized.