Publication: Böğürtlenin (Rubus L.) Bileşimi ve Böğürtlen Reçellerinde Renk Üzerine Depolamanın Etkisi
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Ill BÖĞÜRTLENİN (RUBUS L.) BİLEŞİMİ ve BÖĞÜRTLEN REÇELLERİNDE RENK ÜZERİNE DEPOLAMANIN ETKİSİ ÖZET Bu araştırma, böğürtlen reçellerinin depolanması sırasında renk üzerine depolama süre ve depolama sıcaklığının etkisini belirlemek amacıyla yapılmıştır. Bunun için Samsun ve çevresinde doğal olarak yetişen karışık çeşitler hasat edilerek bileşimi saptanmış ve karışık halde üç farklı brikste (68, 70 ve 72 Bx) reçele işlenmiş ve sitrik asit ile pH'ları 3.01 'e ayarlanmıştır. Reçellerin çeşitli fiziksel ve kimyasal özellikleri saptanmış ve örneklerin yarısı oda sıcaklığında (+20°C) diğer yarısı buzdolabı sıcaklığında (+4°C) altı ay süresince depolanmış ve her bir aylık depolama süresince formol sayısı, askorbik asit, titrasyon asitliği, pH, toplam şeker, invert şeker, sakaroz, toplam fenolik madde ile toplam antosiyanin özellikleri belirlenmiştir. Periyodik analizler sonucunda formol sayısı 4. aya kadar değişmemiş fakat bu aydan sonra azalmış; askorbik asit içeriği depolama süresince azalmış ve 5. aydan itibaren 1 mg / 100 g'ın altına düşmüştür. Periyodik incelenen özelliklerin istatiksel analizi sonucunda pH, titrasyon asitliği, invert şeker, sakaroz, HMF, toplam fenolik madde ve toplam antosiyanin üzerine briks, depolama şartları ve depolama süresinin etkisi çok önemli (p <0.01), toplam şeker üzerine ise sadece brikslerin etkisi önemli (p <0.05) bulunmuştur. Briks x depolama süresi interaksiyonu HMF değeri yönünden çok önemli (p <0.01), pH yönünden ise sadece önemli (p <0.05);depolama şartları x depolama süresi interaksiyonu pH, invert şeker, sakaroz, toplam fenolik madde miktarı üzerine çok önemli (p <0.01), toplam antosiyanin miktarı üzerine önemli (p <0.05) olduğu tespit edilmiştir. Reçellere özgün rengini veren toplam antosiyanindeki azalma, oda sıcaklığında depolananlarda % 44.16, buzdolabı koşullarında depolananlarda ise % 12.89 olmuştur. Bu kayıp altı aylık depolama sonunda 68 Bx'lilerde % 24.65; 70 Bx'lilerde % 28.1 1 ve 72 Bx'lilerde % 32.83 olarak belirlenmiştir. Anahtar sözcükler: Böğürtlen, böğürtlenin bileşimi, reçel, HMF, antosiyanin.
ABSTRACT ' This research was studied to identify the effect of storage period and storage temperature on color during the storage of the blackberry jams. For this purpose, several varieties which is naturally grown in Samsun and its environment were harvested and the mixed varieties were processed into jam in three different brix (68, 70, 72 Bx) degree. Also the pH of the jams were adjusted to 3.01 by the addition of citric acid. Several physical and chemical properties of the jams were identified and the half of the jam samples were stored at room temperature (+ 20 ° C ) and the other at refrigerator temperature (+4 ° C) for six months and formol number, ascorbic acid, titratable acid, pH, total sugar, invert sugar, sucrose, HMF, total phenolic matters and total anthocyanin compositions of the jam samples were identified monthly. As the result of periodic analyses, there wasn' t any difference in formol number until the 4th month, but then it was decreased; also there was a decrease in ascorbic acid content during the storage and begining from the 5 th month it was decreased below 1 mg/ 100g. As the results of statistical analyses of the properties periodically studied, the effects of brix, storage conditions and storage time on pH, titratable acidity, invert sugar, sucrose, HMF, total phenolic compound and total anthocyanin were found to be significant at p< 0.01 level, although the effect of brix on total sugar was significant at p< 0.05 level. The effect of brix and storage time interaction was significant at p< 0.01 level as regards HMF values, although the effect of this interaction was significant at p< 0.05 level as regards pH. The effect of storage conditions and storage time interaction was found to be significant at p< 0.01 level as regards pH, invert sugar, sucrose, the amount of total phenolic compound, although it was found to be significant at p < 0.05 as regards total anthocyanin. The decreasing in the amount of total anthocyanin which gives original color to jam was 44.16 % in jams stored at room temperature, and 12.89 % in jams stored at refrigerator temperature. These losses were 24.65, 28.11 and 32.83 % in jams having 68, 70 and 72 Bx respectively after six months storage. Key words: Blackberry, composition of blackberry, jam, HMF, anthocyanin.
ABSTRACT ' This research was studied to identify the effect of storage period and storage temperature on color during the storage of the blackberry jams. For this purpose, several varieties which is naturally grown in Samsun and its environment were harvested and the mixed varieties were processed into jam in three different brix (68, 70, 72 Bx) degree. Also the pH of the jams were adjusted to 3.01 by the addition of citric acid. Several physical and chemical properties of the jams were identified and the half of the jam samples were stored at room temperature (+ 20 ° C ) and the other at refrigerator temperature (+4 ° C) for six months and formol number, ascorbic acid, titratable acid, pH, total sugar, invert sugar, sucrose, HMF, total phenolic matters and total anthocyanin compositions of the jam samples were identified monthly. As the result of periodic analyses, there wasn' t any difference in formol number until the 4th month, but then it was decreased; also there was a decrease in ascorbic acid content during the storage and begining from the 5 th month it was decreased below 1 mg/ 100g. As the results of statistical analyses of the properties periodically studied, the effects of brix, storage conditions and storage time on pH, titratable acidity, invert sugar, sucrose, HMF, total phenolic compound and total anthocyanin were found to be significant at p< 0.01 level, although the effect of brix on total sugar was significant at p< 0.05 level. The effect of brix and storage time interaction was significant at p< 0.01 level as regards HMF values, although the effect of this interaction was significant at p< 0.05 level as regards pH. The effect of storage conditions and storage time interaction was found to be significant at p< 0.01 level as regards pH, invert sugar, sucrose, the amount of total phenolic compound, although it was found to be significant at p < 0.05 as regards total anthocyanin. The decreasing in the amount of total anthocyanin which gives original color to jam was 44.16 % in jams stored at room temperature, and 12.89 % in jams stored at refrigerator temperature. These losses were 24.65, 28.11 and 32.83 % in jams having 68, 70 and 72 Bx respectively after six months storage. Key words: Blackberry, composition of blackberry, jam, HMF, anthocyanin.
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Tez (doktora) –Ondokuz Mayıs Üniversitesi, 1998
Libra Kayıt No: 31524
Libra Kayıt No: 31524
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97
