Abstract
Introduction. Recently, mass media published a number of articles doubting health promoting effect of manuka honey (MH). On the other hand, many researchers emphasize beneficial effect of honey on human digestive tract, respiratory system and skin. However, the honeys tested for their health promoting effects came from certified sources and met the applicable harvesting, storage and packing standards between the production and testing. Aim. The purpose of the study was to compare quality features of manuka honey (MH) imported to and sold in, Poland: methylglyoxal (MGO), 5-hydroxymethylfurfural (HMF) and diastase number (DN) declared for product lots by producers and distributors vs. the actual figures. Material and methods. The study tested 45 samples of MH coming from 9 producers, acquired from different local suppliers (importers and distributors), marketed in Poland in 2014-2015. The contents of MGO were measured using the high-performance liquid chromatography (HPLC) method. The contents of HMF were measured using high-performance liquid chromatography with spectrophotometric detection (HPLC-UV) in accordance with the regulation by the Polish Minister of Agriculture. DN were determined using the photometric method acc. To the regulation by the Polish Minister of Agriculture. Results. A review of the test results revealed a relationship between the declared and the actual contents of MGO. For the MH with MGO > 500, the actual values were different more frequently. For the MH with higher declared MGO contents (< 500), commercial quality of the products was worse (too high HMF and too low DN). Conclusions. The MH with MGO under 500 mg/kg can be recognized as satisfactory in terms of MGO contents and commercial quality.
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