The intensity of the cluster drop affects the bioactive compounds and fatty acid composition in hazelnuts




Antioxidant, Cluster drop, Hazelnut, Nut traits, Oleic acid, Phenolics


This study was conducted to determine how the intensity of the cluster drop effects nut traits, bioactive compounds, and fatty acid composition in Tombul, Palaz and Kalınkara hazelnut cultivars. The cluster drop significantly affected bioactive compounds and fatty acid composition while it did not affect the traits of the nuts. As cluster drop intensity increased, nut traits and bioactive compounds in all cultivars increased. Strong cluster drop intensity determined the highest total phenolics, total flavonoids, and antioxidant activity. Except for the Kalınkara cultivar, a low amount of linoleic acid was detected while high amounts of oleic and stearic acid were determined in slight cluster drop intensity. As cluster drop intensity increased, palmitic acid increased. Principal component analysis showed that the slight and intermediate drop intensity were generally associated with kernel length, oleic, linoleic, stearic, palmitoleic, 11-eicosenoic and arachidic acids. In contrast, strong intensity was associated with nut and kernel weight, kernel ratio, kernel width, kernel thickness, kernel size, bioactive compounds, and palmitic acid. As a result, the bioactive compounds and fatty acid composition, which are important for human health, was significantly affected by cluster drop intensity.


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Arora NK. 2019. Impact of climate change on agriculture production and its sustainable solutions. Environ. Sustain. 2, 95-96.

Alasalvar C, Pelvan E, Topal B. 2010. Effects of roasting on oil and fatty acid composition of Turkish hazelnut varieties (Corylus avellana L.). Int. J. Food Sci. Nutr. 61, 630-642. PMid:20384549

Bak T, Karadeniz T. 2021. Effects of branch number on quality traits and yield properties of European hazelnut (Corylus avellana L.). Agriculture 11, 437.

Balik HI. 2021. Bioactive compounds and fatty acid composition of new Turkish hazelnut cultivars. Int. J. Fruit Sci. 21, 106-114.

Balik Hİ, Balik KS, Beyhan N, Erdoğan V. 2016. Hazelnut cultivars. Trabzon Commodity Exchange, 1st edn, Klasmat press, Turkey, pp 1-50.

Balta MF, Yarılgaç T, Aşkın MA, Kuçuk M, Balta F, Özrenk K. 2006. Determination of fatty acid compositions, oil contents and some quality traits of hazelnut genetic resources grown in eastern Anatolia of Turkey. J. Food Compost. Anal. 19, 681-686.

Balta MF, Yarılgaç T, Balta F, Kul E, Karakaya O. 2018. Effect of elevation and number of nuts per cluster on nut traits in 'Cakıldak' hazelnut. Acta Hortic. 1226, 161-166.

Benzie IF, Strain JJ. 1996. The ferric reducing ability of plasma (FRAP) as a measure of "antioxidant power": the FRAP assay. Anal. Biochem. 239, 70-76. PMid:8660627

Bignami C, Cristofori V, Bertazza G. 2011. Effects of water availability on hazelnut yield and seed composition during fruit growth. Acta Hortic. 922, 333-340.

Blois MS. 1958. Antioxidant determinations by the use of a stable free radical. Nature 181, 1199-1200.

Bostan SZ. 2020. Effect of irrigation on vitamin E content and fatty acid compositions of 'Tombul' hazelnut. Int. J. Agric. Wild. Sci. 6, 108-114.

Bostan SZ, Tonkaz T. 2013. The effects of arid and rainy years on hazelnut yield in the Eastern Black Sea region of Turkey. "24th International Scientific Expert Conference on Agriculture and Food Industry". 25-28 September 2013, Sarajevo, Bosnia and Herzegovina. Proceedings, 467-470.

Contini M, Frangipane MT, Massantini R. 2011. Antioxidants in hazelnuts (Corylus avellana L.). In Nuts and Seeds in Health and Disease Prevention, Academic Press, London, pp. 611-625.

Cristofori V, Bertazza G, Bignami,C. 2015. Changes in kernel chemical composition during nut development of three Italian hazelnut cultivars. Fruits 70, 311-322.

Di Nunzio M. 2019. Hazelnuts as source of bioactive compounds and health value underestimated food. Curr. Res. Nutr. Food Sci. J. 7, 17-28.

Dumas Y, Dadomo M, Di-Lucca G, Grolier P. 2003. Effects of environmental factors and agricultural techniques on the antioxidant content of tomatoes. J. Sci. Food Agric. 83, 369-382.

Firestone D. 1997. Method no: Cd 8-53. Official methods and recommended practices of the American Oil Chemists Society, 5th edn, AOCS press, USA, pp. 555-563.

Guler E, Balta,F. 2020. Determination of yield and quality characteristics of hazelnut populations of Taskesti district (Mudurnu-Bolu). Int. J. Agric. Wild. Sci. 6, 115-128.

Hamrouni I, Salah HB, Marzouk B. 2001. Effects of water-deficit on lipids of safflower aerial parts. Phytochemistry 58, 277-280. PMid:11551551

Karaosmanoglu H, Ustun NS. 2021. Fatty acids, tocopherol and phenolic contents of organic and conventional grown hazelnuts. J. Agric. Sci. Technol. 23, 167-177.

Köksal Aİ, Artik N, Şimşek A, Güneş N. 2006. Nutrient composition of hazelnut (Corylus avellana L.) varieties cultivated in Turkey. Food Chem. 99, 509-515.

Lorite IJ, Gabaldón-Leal C, Ruiz-Ramos M, Belaj A, De La Rosa R, León L, Santos C. 2018. Evaluation of olive response and adaptation strategies to climate change under semi-arid conditions. Agric. Water Manag. 204, 247-261.

Milošević T, Milošević N. 2012. Cluster drop phenomenon in hazelnut (Corylus avellana L.). Impact on productivity, nut traits and leaf nutrients content. Sci. Hortic. 148, 131-137.

Muscogiuri G, Barrea L, Savastano S, Colao A. 2020. Nutritional recommendations for CoVID-19 quarantine. Eur. J. Clin. Nutr. 74, 850-851. PMid:32286533 PMCid:PMC7155155

Naikoo MI, Dar MI, Raghib F, Jaleel H, Ahmad B, Raina A, Khan FA, Naushin F. 2019. Role and regulation of plants phenolics in abiotic stress tolerance: an overview. Plant Signal. Molecul. 9, 157-168.

Othmani A, Jemni M, Kadri K, Amel S, Artés F, Al-Khayri JM. 2020. Preharvest fruit drop of date palm (Phoenix dactylifera L.) cv. Deglet Nour at Kimri Stage: Development, physico-chemical characterization, and functional properties. Int. J. Fruit Sci. 20, 414-432.

Ozturk B, Bektas E, Aglar E, Karakaya O, Gun S. 2018. Cracking and quality attributes of jujube fruits as a-ected by covering and pre-harvest Parka and GA3 treatments. Sci. Hortic. 240, 65-71.

Rejeb IB, Pastor V, Mauch-Mani B. 2014. Plant responses to simultaneous biotic and abiotic stress: molecular mechanisms. Plants 3, 458-475. PMid:27135514 PMCid:PMC4844285

Sengul S. 2019. The effect of different harvest date and altitude on chemical composition, antioxidant capacity and quality parameters of hazelnut oil. Ordu University, Institute of Science, Master's thesis, Turkey.

Shahi A, Fatahi MR, Zamani Z, Maali-Amiri R. 2020. Study of physiological and biochemical responses of some hazelnut cultivars under‎ drought stress and re-watering conditions. Iranian J. Hortic. Sci. 51, 229-244.

TSMS (2021). Turkish State Meteorological Service.

Turan A. 2019. Effect of drying on the chemical composition of Çakıldak (cv) hazelnuts during storage. Grasas Aceites 70, e296.

Xu L, Han L, Huang B. 2011. Membrane fatty acid composition and saturation levels associated with leaf dehydration tolerance and post-drought rehydration in Kentucky bluegrass. Crop Sci. 51, 273-281.

Yılmaz M, Karakaya O, Balta MF, Balta F, Yaman İ. 2019. Change of biochemical characteristics depending on kernel size in Çakıldak hazelnut cultivar. Academic J. Agric. 8, 61-70.



How to Cite

Karakaya O. The intensity of the cluster drop affects the bioactive compounds and fatty acid composition in hazelnuts. Grasas aceites [Internet]. 2023Mar.16 [cited 2024May23];74(1):e487. Available from: