Turkish Journal of Field Crops

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EFFECTS OF COOKING METHODS ON THE ANTHOCYANIN LEVELS AND ANTIOXIDANT ACTIVITY OF A LOCAL TURKISH SWEETPOTATO [Ipomoea batatas (L.) LAM] CULTIVAR HATAY KIRMIZI: BOILING, STEAMING AND FRYING EFFECTS

Ozlem TOKUSOGLU , Zihin YILDIRIM

Abstract

The study was conducted on the anthocyanin (TA) level and antioxidant activity (AA) of a local genotype of sweetpotato (Hatay Kirmizi) and heating process effects including boiling, steaming, frying on TA and AA levels. The anthocyanin calibration graph of standard cyanidin-3-glucoside gave linear equation (y= 0.0113x+ 0.0045 ; R2 = 0.9986). Anthocyanin level of sweetpotato Hatay Kirmizi (as cyanidin-3-glucoside (C3G) equivalent) was determined as 11992 ± 15.86 mg/100g) (n=8) (p≤0.05). Anthocyanins were detected as 13767 ± 8.94 mg/100g; 24756 ± 6.70 mg/100g; 6755 ± 10.22 mg/100g in boiled, steamed and fried sweetpotatoes, respectively (n=2) (p≤0.05). The total anthocyanins increased as 1.14 fold after boiling process and increased 3.22 fold after steaming process and decreased 1.78 fold after frying process (p≤0.05). It was determined that steaming process, was the most effective among the heat-treated sweetpotatoes (HTSPs). Antioxidant activities of the HTSPs was 78.76%, 89.67%, 97.92% and 57.89% (as radical inhibition percent), respectively. With using steaming process, radical inhibition percent increased 1.24 fold. Tubers of sweetpotato Hatay Kirmizi can be consumed not only steamed > boiled > fried forms but also can be processed into food products, such as muffins, cookies, biscuits, breakfast foods with longer shelf-life, and improved characteristics. It was proposed that sweetpotato Hatay Kirmizi can be processed into flour and used as a thickener, antioxidant enhancer and color source in industrial powder soups, gravy, extruder snacks, and some bakery products.

Keyword: Sweet potato, anthocyanin, antioxidant activitiy, Hatay Kirmizi ,

Effects of Different Water Stress Levels on Biomass Yield and Agronomic Traits of Switchgrass (Panicum virgatum L.) Varieties under Semi-Arid Conditio

Erdal GONULAL, Suleyman SOYLU, Mehmet SAHIN

Abstract

A field experiment was conducted in the Wielkopolska region at the Gorzyń Research Station, Poland (52.34°N, 15.54°E) in Central Europe. The study was conducted over a 3-year period (2017, 2018, 2019) as a two-factorial design with four replications in the RCBD. The aim of the research was to determine the effect of the cultivar (‘Bolero’, ‘Tytan’) and the inoculation (Nitragina–seeds inoculation, Nitroflora I–seeds inoculation, Nitroflora II–soil inoculation, HiStick® Lupin–seeds inoculation) on plant development, seeds chemical composition and yielding of narrow-leaved lupin. The weather conditions and experimental factors significantly influenced on productivity of narrow-leaved lupin ‘Tytan’. Drought during the growing season reduced seeds and protein yields. After inoculation of HiStck the seeds yield was significantly greater by 12.4% (p < 0.01) and the protein yield after application of Nitroflora I or HiStick by 13.9% (p < 0.01) and 19.2% (p < 0.01), respectively. Correlation coefficients showed strong relations between number of pods and seeds per plant in both cultivars regardless of the inoculation variant, however the strongest relations in both cultivar were proved on HiStick treatment.
Keyword: Biological nitrogen fixation, chemical composition, legumes, protein efficiency, yielding