Spouted Bed Dried Rosmarinus officinalis Extract: A Novel Approach for Physicochemical Properties and Antioxidant Activity

Claudia R. F. Souza, Iara Baldim, Victor O. Bankole, Raquel da Ana, Alessandra Durazzo, Massimo Lucarini, Nicola Cicero, Antonello Santini, Eliana B. Souto and Wanderley P. Oliveira
Additional contact information
Claudia R. F. Souza: Faculty of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Av. do Café s/n, Ribeirão Preto 14040-903, SP, Brazil
Iara Baldim: Faculty of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Av. do Café s/n, Ribeirão Preto 14040-903, SP, Brazil
Victor O. Bankole: Faculty of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Av. do Café s/n, Ribeirão Preto 14040-903, SP, Brazil
Raquel da Ana: Department of Pharmaceutical Technology, Faculty of Pharmacy, University of Coimbra, Pólo das Ciências da Saúde, Azinhaga de Santa Comba, 3000-548 Coimbra, Portugal
Alessandra Durazzo: CREA-Research Centre for Food and Nutrition, Via Ardeatina 546, 00178 Rome, Italy
Massimo Lucarini: CREA-Research Centre for Food and Nutrition, Via Ardeatina 546, 00178 Rome, Italy
Nicola Cicero: Department of Biomedical and Dental Sciences and Morphofunctional Imaging, University of Messina, Polo Universitario Annunziata, 98168 Messina, Italy
Antonello Santini: Department of Pharmacy, University of Napoli Federico II, Via D. Montesano 49, 80131 Napoli, Italy
Eliana B. Souto: CEB—Centre of Biological Engineering, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal
Wanderley P. Oliveira: Faculty of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Av. do Café s/n, Ribeirão Preto 14040-903, SP, Brazil

Agriculture, 2020, vol. 10, issue 8, 1-16

Abstract: In this study, a conical-cylindrical spouted bed dryer with Teflon ® beads as spouting material was used for producing powdered rosemary ( Rosmarinus officinalis L.) extract. The influence of the inlet drying gas temperature (T gi ) and the percentage ratio between the feed rate of concentrated liquid extract by the maximum evaporation capacity of the spouted bed (W s /W max ) on selected physicochemical properties of the finished products were investigated. Antioxidant properties of the concentrated liquid extract and dried extracts were also evaluated by the 2.2-diphenyl-1-picrylhydrazyl radical scavenging (DPPH • ) and lipid peroxidation induced by Fe 2+ /citrate (LPO) methods; and compared with the values obtained for a lyophilized extract (used as a control). Colloidal silicon dioxide (Tixosil ® 333) and maltodextrin (DE 14) at a 2:1 ratio was added to the concentrated extract before drying (4.4% w / w ) to improve the drying performance. The drying variables W s /W max and T gi have statistically significant influence on total polyphenols and total flavonoid contents of the dried powders. The concentrated extract (on dry basis—being absolute solid content) showed superior antioxidant activity (AA) compared to both the spouted bed dried and the lyophilized extracts; exhibiting IC50 values of 0.96 ± 0.02, 2.16 ± 0.04 and 3.79 ± 0.05 µg mL −1 (DPPH • method) and 0.22 ± 0.01, 1.31± 0.01 and 2.54 ± 0.02 µg mL −1 (LPO method), respectively. These results of AA are comparable to values obtained for quercetin, a flavonoid compound often used as a reference standard due to its potent antioxidant activity; with IC 50 of 1.17 µg mL −1 (DPPH • ) and 0.22 µg mL −1 (LPO). However, the dried rosemary extracts are about 13.5 times more concentrated than the initial concentrated extract (dry weight), with a concentration of total flavonoids and polyphenols compounds ranging from 4.3 to 12.3 and from 1.2 to 4.7 times higher than the concentrated extract values (wet basis). The AA per dry product mass was thus significantly higher than the values measured for concentrated extractive solution, irrespective of some losses of AA apparently due to the drying process.

Keywords: herbal medicinal product; dried extract; spouted bed drying; antioxidant activity; Rosmarinus officinalis; powder properties (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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