Veli Gök

Effect of replacing beef fat with olive oil on quality characteristics of Turkish soudjouk (sucuk)

Four formulation of Turkish soudjouks were produced in three replicates by traditional methods as follows; one control (C) using 85% beef and 15% beef fat and three treatments by replacing 20, 40 and 60% of beef fat with virgin olive oil incorporated as pre-emulsified fat (PEF) with soy protein isolate (SPI), respectively. It was found that the moisture content and pH decreased while fat and ash content increased on the 21st day of fermentation and in the ripening period. Cholesterol content decreased depending on the amount of incorporated olive oil to the formulation, which shows the addition of olive oil in soudjouks reduces the cholesterol content (P<0.05). TBA values were affected by the amount of incorporated olive oil and the highest TBA value was found for with the 60% olive oil replacement. Oleic and linoleic acid contents were high while other fatty acid contents were low for the 40 and 60% olive oil samples compared with controls. Sausages with 40% olive oil received high evaluation from the panel for appearance and texture but there was no significant difference (P>0.05) between samples in the terms of color and general acceptability. It is concluded that replacement of beef fat with olive oil had a positive effect on sensory quality and on reducing the cholesterol content of soudjouks.

Effects of packaging method and storage time on the chemical, microbiological, and sensory properties of Turkish pastirma : A dry cured beef product

The effects of packaging method (aerobic packaging (AP), vacuum packaging (VP) or modified atmosphere packaging (MAP)), the form of pastirma (sliced or non-sliced) and storage time (0, 15, 30, 60, 90 or 120 days) on the chemical, microbiological and sensory properties of a Turkish pastirma were investigated. Overall, MAP preserved chemical, microbiological and sensory properties of Turkish pastirma better than AP or VP. Very high correlation coefficients (almost all >0.90) were observed between subjective quality parameters (sensory properties) and objective quality parameters (TBARS, hexanal content, L(∗), a(∗), and b(∗)), which suggests that sensory panel was able to determine the quality changes over storage time precisely. Based on the results of this study, MAP should be the preferred choice of packaging in order to preserve overall quality of Turkish pastirma and its implication for pastirma packaging may increase pastirmas current share in the processed meat product market.

Determination of antioxidant effects of some plant species wild growing in Turkey

In this study, the antioxidant activity of 50% aqueous methanol extracts of Crataegus tanacetifolia (Lam.) Pers, Crataegus bornmuelleri Zaberi, Crataegus orientalis Pall. ex M.Bieb. var. orientalis, Crataegus szovitsii Pojark, Crataegus curvisepala Lindm., Crataegus monogyna Jacq. subsp. monogyna, Crataegus monogyna Jacq.subsp. azarella (Gris.) Franco, Crataegus micophylla C.Koch, Rosa foetida Herrm., Rosa hemisphaerica J.Herrm., Rosa pulverulenta M.Bieb., Rosa canina L., Rubus discolor Weihe & Nees, Rubus canescens DC. var. canescens, Rubus sanctus Screber, Rubus caesius L., Sorbus umbellata (Desf.) Fritsch var. umbellata, Prunus avium L. (Moench.) and Prunus cerasus L. Mespilus germenica was evaluated by various antioxidant assays, including free radical scavenging, hydrogen peroxide scavenging and metal-chelating activities. The extracts of R. hemisphaerica J.Herrm., P. cerasus L. and R. canina L. showed more stronger free radical scavenging and hydrogen peroxide scavenging activities, and the extracts of R. foetida Herrm. (62.54%) and P. cerasus L. showed stronger metal-chelating activity. The results obtained in the present study indicated that the R. hemisphaerica J.Herrm., P. cerasus L. and R. canina are potential sources of natural antioxidant. These antioxidant properties depend on the concentration of the sample.

Effect of ground poppy seed as a fat replacer on meat burgers

Poppy seed paste was used in koefte production as an animal fat replacer and efficacy of using poppy seed was investigated. The use of ground poppy seed in formulation of meat burgers had no effect on the moisture content of uncooked meat burgers; however, it did have a significant effect (p<0.05) on the fat content of meat burgers. Ground poppy seed addition significantly affected (p<0.05) cooking yield, moisture retention, and fat retention of meat burgers. Ground poppy seed addition significantly decreased (p<0.05) saturated fatty acid contents as the amount of ground poppy seed increased in meat burgers. A strong significant decrease (p<0.05) on the cholesterol content of meat burgers with ground poppy seed addition was observed. Samples having 20% ground poppy seed had significantly better texture and juiciness score (p<0.05) than any other sample which could be explained by increased moisture retention. Replacing animal fat with ground poppy seed paste is effective and may pave the way for an innovative meat product.

Antioxidant properties of 12 cornelian cherry fruit types (Cornus mas L.) selected from Turkey

+2 ) chelating activities. The methanolic fruit etxracts of the Cornus mas L. fruit types (H 2O2 and diphenylpicrylhydrazyl (DPPH) scavenging activities, Fe +2 chelating activity) examined in the assay showed the strongest activities. The highest antiradical activity was found 44-05 type (0.943) followed by 44-04 (0.860), 77-09 (0.810) and 77-05 (0.723) types respectively. The lowest value was found 44-01 (0.537), 77-06 (0.580), 77-11 (0.567) and 77-02 (0.563) types. The highest chelating activity was found; 44- 05 (54.213%), 44-04 (49.890%), 77-09 (47.287%) and 77-05 (45.180%) cornelian cherry type respectively. The lowest cheting activity was found 77-06 (33.883%), 44-01 (34.106%) and 77-11 (34.510%) types. In terms of H 2O2 inhibition, the highest rate was obtained from 44-05 (79.103%), the lowest one was 44-01 type to be 37.720%.

Effects of dry, vacuum, and special bag aging; USDA quality grade; and end-point temperature on yields and eating quality of beef Longissimus lumborum steaks

This study evaluated the effects of three aging methods: (dry (D), wet (W), and special bag (SB)); two quality grades [USDA Choice((≥Small(50) marbling) and Select); and two cooked end-point temperatures (62.8 °C and 71.1 °C) on physico-chemical traits of instrumental tenderness, color, and sensory properties of Longissimus lumborum beef muscle. Dry-aged loins had higher (P<0.0001) weight loss than W or SB aged loins. However, D and SB aged loins had similar (P>0.05) combined losses. W aged loins had higher (P<0.01) L* values than D or SB aged loins. Warner-Bratzler shear force of steaks was not affected (P>0.05) by aging method or quality grade but increased (P<0.0001) as end-point temperature increased. Sensory panel evaluation also showed no effect (P>0.05) of aging method or quality grade on myofibrillar tenderness, juiciness, connective tissue amount, overall tenderness or off flavor intensity. Steaks cooked to 62.8 °C were juicier (P<0.05) than those cooked to 71.1 °C. Neither D nor SB aging had advantages over W aging.

Effects of blade tenderization, aging method and aging time on meat quality characteristics of Longissimus lumborum steaks from cull Holstein cows ☆

The effects of blade tenderization (BT), two aging methods (dry (D) and wet (W)), and aging time (2 and 23 d) on tenderness, color, and sensory properties of Longissimus lumborum muscles from 12 cull Holstein cows were evaluated. Dry-aged loins had higher combined trim and aging losses than control (C) for both D- and W-aging, mostly because of excess trim losses. BT steaks had WBSF of 33.13 N while C steaks had WBSF of 41.46 N (P=0.09). Aging decreased WBSF. Blade tenderized steaks had higher cook loss than C steaks. Aging, W-aging, and BT×W-aging improved myofibrillar (sensory) tenderness scores. Aging and/or BT improves sensory panel tenderness cull cow Longissimus lumborum steaks. Aging and blade tenderization combined can increase tenderness and value of Longissimus steaks from cull Holstein cows.

Nutritional Evaluation of Seasonal Changes in Muscle Fatty Acid Composition of Common Carp (Cyprinus carpio) in Karamik Lake, Turkey

The present study aims to determine seasonal changes of nutritional value of common carp in Karamık Lake by determining the fatty acid composition. The levels of saturated, monounsaturated, and polyunsaturated fatty acids in 100 g total fatty acid were found to be 28.73, 25.31, and 38.19 g in winter; 29.39, 24.06, and 35.75 g in spring; 31.05, 35.02, and 24.86 g in summer; 29.85, 32.39, and 30.92 g in autumn, respectively. Total ω3 and ω6 polyunsaturated fatty acid levels in 100 g fatty acid in muscle of the common carp ranged from 12.90 g to 25.97 g and from 10.73 g to 14.59 g, respectively. The ratio of total ω3 polyunsaturated fatty acids was higher than that of total ω6 polyunsaturated fatty acids in all seasons. The ratios of ω6/ω3 polyunsaturated fatty acids and arachidonic/eicosapentaenoic acids were the lowest in winter (0.41, 0.64) and highest (0.98, 2.72) in autumn. The amount of eicosapentaenoic + docosahexaenoic acids was also highest in winter and was composed of 22.50 g of 100 g total fatty acid in muscle of pike.

Enterotoxin production by Staphylococcus aureus (A, B, C, D) during the ripening of sucuk (Turkish dry-fermented sausage)

This study was conducted to determine the capability of Staphylococcus aureus to produce toxins in Turkish sucuk. For this purpose, the ability of four different reference strains of S. aureus (i.e., SEA 10652 FDA 196E, SEB 10654 FDA 243, SEC 10655 137, and SED 10656 494) to produce A-, B-, C-, and D-type toxins, respectively, was investigated during the fermentation period of Turkish sucuk by inoculating sucuk batter with these strains at 105 CFU/g level. As a result, no SEA, SEB, and SEC toxins were detected in the A, B, and C groups, respectively, during fermentation. In group D, SED was detected after 24 h and at the 3, 7, and 12 days of ripening. In conclusion, these results indicate that Turkish sucuk may pose an important health risk related to possible contamination with S. aureus (SED) during the production processes.

Antioxidant Activity of Ribes multiflorum Kit. ex Roem. & Schult (blackcurrant) Extract

Abstract In this study, the antioxidant contents of Ribes multiflorum Kit. Ex Roem. & Schult (black currant) which was grown in Emir and Kumalar mountains in Afyonkarahisar were investigated. Ribes multiflorum Kit. Ex Roem. & Schult is found on 1700 m at Emir Mountain in Dumluca, on 1400 and 1600 m at Kumalar Mountains in Basören. Antioxidant activities of samples were determined by free radical scavenging effect, chelating activity with Fe +2 and H2O2 inhibition methods. The lower EC50 value, the higher antioxidant power. In the presence of metal ions, super reactive hydroxyl radical may be formed by Fenton reaction. The findings obtained in the present work indicated that the Ribes multiflorum are potential source of natural antioxidant. Their antioxidant properties probably depend on concentration of sample.