Chemical composition of juice and madzun (grape molasses) produced from Stanushina grape variety by traditional method

In this study, some chemical characteristics and mineral composition of juice and madzun (grape molasses) produced from the Stanushina grape variety by the traditional method were analysed. Comparative analyses were conducted on one juice sample (S1) and two (S2, S3) madzun samples. Classical, spectrophotometric and HPLC methods were used to determine the basic parameters that determine the quality of madzun. The ICP-MS method was used to determine the content of micro and macro elements. From the obtained results it can be seen that the soluble dry matter content ranges from 29.41 (juice) to 82.98% (madzun), total sugar ranges from 28.04 (juice) to 67.99% (madzun), total phenols 875 (madzun) to 1212 mg/l (juice) and HMF (hydroxymethyl furfural) in the range from 5.25 mg/kg (juice) to 723.05 mg/kg (madzun). The content of the macro elements K, Ca and Mg was determined and ranged from 386-640 mg/kg, 111.7-375 mg/kg, 205.5-297.1 mg/kg respectively. The content of trace elements ranges (Fe 11.26-15.18 mg/kg, Mn 2.42-4.90 mg/kg, Zn 7.34-17.47 mg/kg, B 35.2-39.9 mg/kg and Ba 0.35-0.84 mg/kg). It was also determined that the content of heavy metals (Pb and Ni) in samples S1 and S2 is above the permissible limits for this type of food. This research showed that the composition of the madzun is influenced by the micro region where the grapes are grown, as well as the type and chemical composition of the soil.