Retarding sunflower oil oxidation during the deep-fat frying of potato chips using micro-encapsulated Convolvulus arvensis Linn leaf phenolic extract




Convolvulus arvensis, Deep fat frying, Frying oil quality, FTIR spectroscopy, Micro-encapsulation


In this research, the extraction of polyphenols from Convolvulus arvensis (CA) leaves was optimized using ethanol (80%) at plant/solvent ratios and extraction times which varied between 1/10 to 1/30 (w/v) and 20 to 120 min, respectively. The extract with the highest polyphenol content was obtained at a ratio of 1/30 and 90 min. At 120 ppm, the preceding extract in either lyophilized (LyCAE) or encapsulated (EnCAE) form was evaluated as an antioxidant during the frying process using sunflower oil in comparison to TBHQ. Frying oil quality indices including refractive index, smoke point, acid value, anisidine value, polar and polymer compounds were monitored throughout frying times. FTIR spectroscopy was used to investigate the changes in trans-fatty acids, hydroperoxides and aldehyde contents. The results showed that the phenolic extract, especially in EnCAE form, exhibited superior antioxidant activity over TBHQ, which consequently led to the utilization of this phenolic extract as an antioxidant in frying oils.


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Ahmad MH, Saeed N, Imran M, Khan MK, Muhammad N, Sahar A, Khan MI. 2022. Rapid and nondestructive characterization of multiple frying sunflower oil blend using fourier transform infrared spectroscopy and chemometrics. Int. J. Food Prop. 25 (1), 214-226.

Al-Snafi AE. 2020. The chemical constituents and pharmacological effects of Convolvulus arvensis and Convolvulus scammonia-A review. IOSR J. Pharm. 6 (6), 64-75.

AOCS. 2009. Official methods and recommended practices of the AOCS. Champaign, IL: AOCS Press.

Asadi Y, Farahmandfar R. 2020. Frying stability of canola oil supplemented with ultrasound-assisted extraction of Teucrium polium. Food Sci. Nutr. 8 (2), 1187-1196. PMid:32148824 PMCid:PMC7020264

Biswal A, Pooja B, Sarathchandra G, Selvam P. 2021. Current trends on the utility of antioxidant in cooking oil: A review. J Pharm Innov. 10 (3), 463-471.

Carelli AA, Franco IC, Crapiste GH. 2005. Effectiveness of added natural antioxidants in sunflower oil. Grasas Aceites. 56 (4), 303-310.

Chirinos R, Rogez H, Campos D, Pedreschi R, Larondelle Y. 2007. Optimization of extraction conditions of antioxidant phenolic compounds from mashua (Tropaeolum tuberosum Ruíz and Pavón) tubers. Sep. Purif. Technol. 55 (2), 217-225.

Choe E, Min D. 2007. Chemistry of deep-fat frying oils. J. Food Sci. 72, R77-R86.

Codex Alimentarius Commission. 2019. Codex standard for named standard for edible fats and oils. Codex Stan 210-1999. Rome: FAO.

Ćujić N, Šavikin K, Janković T, Pljevljakušić D, Zdunić G, Ibrić S. 2016. Optimization of polyphenols extraction from dried chokeberry using maceration as traditional technique. Food Chem. 194, 135-142. PMid:26471536

Elsayed N, Hammad KSM, Abd El-Salam EA. 2020. Plum (Prunus domestica L.) leaves extract as a natural antioxidant: Extraction process optimization and sunflower oil oxidative stability evaluation. J. Food Process. Preserv. 44 (10), 1-11.

Elzaawely AA, Tawata S. 2012. Antioxidant activity of phenolic rich fraction obtained from Convolvulus arvensis L. leaves grown in Egypt. Asian J. Crop Sci. 4, 32-40.

European Commission. 2013. Commission implementing regulation (EU) No 299/2013 of 26 March 2013 amending Regulation (EEC) No 2568/91 on the characteristics of olive oil and olive-residue oil and on the relevant methods of analysis. Off. J. Europ. Union. 90, 52-70.

Farag RS, Mahmoud EA, Basuny AM. 2007. Use crude olive leaf juice as a natural antioxidant for the stability of sunflower oil during heating. Int. J. Food Sci. Technol. 42 (1),107-115.

Firestone D. 2007. Regulation of frying fat and oil, in Erickson MD (Ed.) Deep Frying Chemistry, Nutrition, and Practical Applications, 2nd ed, AOCS Press, Illinois, pp. 373-386.

Formagio ASN, Volobuff CRF, Santiago M, Cardoso CAL, Vieira MC, Pereira ZV. 2014. Evaluation of antioxidant activity, total flavonoids, tannins and phenolic compounds in Psychotria leaf extracts. Antioxidants 3,745-757. PMid:26785238 PMCid:PMC4665508

Frankel EN. 2005. Lipid Oxidation, (2nd ed). Woodhead Publishing Limited, Cambridge, UK.

Guillen MD, Cabo N. 1997. Infrared spectroscopy in the study of edible oils and fats. J. Sci. Food Agric, 75, 1-11.<1::AID-JSFA842>3.0.CO;2-R

Guo Q, Gao S, Sun Y, Gao Y, Wang X, Zhang Z. 2016. Antioxidant efficacy of rosemary ethanol extract in palm oil during frying and accelerated storage. Ind. Crops Prod. 94, 82-88.

Hammad KSM, Morsy NFS, Abd El-Salam EA. 2020. Improving oxidative stability of breadstick with ginkgo (Ginkgo biloba) and ginseng (Panax ginseng) dried extracts. Grasas Aceites. 72 (3), e424.

Li P, Yang X, Lee WJ, Huang F, Wang Y, Li Y. 2021. Comparison between synthetic and rosemary-based antioxidants for the deep frying of French fries in refined soybean oils evaluated by chemical and non-destructive rapid methods. Food Chem. 335, 127638. PMid:32736158

Munin A, Edwards-Lévy F. 2011. Encapsulation of natural polyphenolic compounds; a review. Pharmaceutics 3 (4), 793-829. PMid:24309309 PMCid:PMC3857059

Ozkan G, Franco P, De Marco I, Xiao J, Capanoglu E. 2019. A review of microencapsulation methods for food antioxidants: Principles, advantages, drawbacks and applications. Food Chem. 272, 494-506. PMid:30309574

Pei-Fan W, Nawar WW. 1986. A technique for monitoring the quality of used frying oils. J. Am. Oil Chem. Soc. 63(10), 1363-1367.

Sharma S, Cheng SF, Bhattacharya B, Chakkaravarthi S. 2019. Efficacy of free and encapsulated natural antioxidants in oxidative stability of edible oil: Special emphasis on nanoemulsion-based encapsulation. Trends Food Sci. Technol. 91, 305-318.

Sukri N, Multisona RR, Saputra RA, Nurhadi B. 2021. Effect of maltodextrin and arabic gum ratio on physicochemical characteristic of spray dried propolis microcapsules. Int. J. Food Eng. 17 (2), 159-165.

Urbančič S, Kolar MH, Dimitrijević K, Demšar L, Vidrih R. 2014. Stabilisation of sunflower oil and reduction of acrylamide formation of potato with rosemary extract during deep-fat frying. LWT - Food Sci. Technol. 57 (2), 671-678.

Waltking AE, Wessels H. 1981. Chromatographic separation of polar and non polar components of frying fats. J. Assoc. Chem. 64 (6), 1329-1330.

Wang D, Wang Q, Li S, Xu Y, Wang X, Wang C. 2020. Carvacrol methyl ether, a compound from the essential oil of Gardenia jasminoides fruits, exhibits antioxidant effects in the deep-frying of Chinese Youmotou using sunflower oil. LWT - Food Sci. Technol. 128, 109502.

Wu G, Han S, Zhang Y, Liu T, Karrar E, Jin Q, Wang X. 2022. Effect of phenolic extracts from Camellia oleifera seed cake on the formation of polar compounds, core aldehydes, and monoepoxy oleic acids during deep-fat frying. Food Chem. 372, 131143. PMid:34601419



How to Cite

Hammad K, Elkharsa M, El-Nikeety M, Hallabo S. Retarding sunflower oil oxidation during the deep-fat frying of potato chips using micro-encapsulated Convolvulus arvensis Linn leaf phenolic extract. Grasas aceites [Internet]. 2023Dec.30 [cited 2024Apr.21];74(4):e525. Available from: