Quality determination of apricot jams produced from fresh, frozen and dried apricots

Thesis Type: Postgraduate

Institution Of The Thesis: Bursa Uludağ University, ZİRAAT FAKÜLTESİ, GIDA MÜHENDİSLİĞİ, Turkey

Approval Date: 1999

Thesis Language: Turkish


Supervisor: Ömer Utku Çopur


In this research, to provide a solution of shortage of raw material in jam production and to develope alternative material to jams produced from fresh fruit; frozen and dried apricots were used as a raw material. The aim of this was, extending the production season and determining the most suitable production methods and additives. Four different methods were used in production of jam from fresh and frozen apricots. Sun dried apricots and purchased dried apricots were reconstituted at one night period to gain water their stucture and then processed to jam. All kinds of fruits were processed to jam according to the same recipe which was determined by material balance calculations. Jams were pastorized at 100°C for 5 minutes and then cooled. Hydroxymethylfurfural (HMF) concentration of jams were between 26.29-81.69 mg/kg in jams produced from fresh apricot; 76.18-174.43 mg/kg in jams produced from frozen apricot. It was determined as 89.79 mg/kg in jams produced from sun dried apricots and 62.55 mg/kg in purchased dried apricot.The lowest HMF was determined in the sample produced from fresh apricot by the method in which apricots were mixed with sugar. Addition of CaCİ2 in syrup and holding of fruits in Ca(OH)2 solution gave the expected result for preventing separation of fruit flesh in fresh and frozen apricots. When the two additives were compared, especially addition of CaCl2 was more suitable because of it's practical convenience.