## 4 Discussion  
Unlike the sample 3, industrial strawberry products (termed exhausted strawberry flesh) did exhibit much higher energy values--310 and 276 kcal/100 g of dry weight, respectively [29]. Though electrochemical assays are often applied on food and beverage samples, that is really not true for HPMC assay and fruit samples of any kind [30; 31; 32; 33; 34], in spite of the fact that HPMC actually represents a cheap and time-saving alternative, compared to conventional spectrophotometric and chemiluminescent hydrogen peroxide assays. Additionally, a previously screened sample of the whole strawberry of the Clery cultivar (its polyphenic extract) did exhibit 2.62-fold lower total antioxidant activity (0.042 \(\pm\) 0.003 %/\(\mu\)L, determined by the same polarographic assay). Such a finding was directly a consequence of much lower content of phenolic compounds found for the aforementioned sample of Clery cultivar (TPC and TAC 1597 \(\pm\) 15 mg GAE/kg and 351 \(\pm\) 4 mg C3 GE/kg of fresh strawberry weight, respectively) [34]. The abundance of phenolic compounds (recorded for the sample 3) may actually  
\begin{table}
\begin{tabular}{c c c} \hline \hline
**Parameters** & **PC1** & **PC2** \\ \hline Total dietary fibres & 0.7865 & \(-\)0.1029 \\ Potassium & 0.9562 & \(-\)0.1682 \\ Phosphorus & \(-\)0.4186 & 0.5994 \\ Glucose & 0.4111 & 0.9052 \\ Fructose & 0.3442 & 0.9191 \\ Calcium & 0.7333 & \(-\)0.5861 \\ Sucrose & 0.1173 & 0.9734 \\ Iron & 0.9597 & 0.0912 \\ Magnesium & 0.9461 & \(-\)0.2241 \\ Manganese & 0.8588 & \(-\)0.3366 \\ Water & 0.8702 & \(-\)0.3188 \\ Sodium & 0.5468 & 0.3992 \\ Carbohydrates & 0.3480 & 0.9284 \\ Total soluble sugars & 0.3050 & 0.9511 \\ Total lipids & \(-\)0.8086 & \(-\)0.4356 \\ Energy value & \(-\)0.6016 & 0.6195 \\ \hline \hline \end{tabular}
\end{table}
Table 2: Factor loadings of the principal components (PCs) 1 and 2 obtained by principal component analysis for the chemical composition of the fresh strawberries samples examined.  
Figure 1: Principal component analysis (PCA) of Joly strawberry samples in PC1 versus PC2 plane.  
contribute a lot both to the anti-obesity and anti-hypertensive effects of this particular strawberry breed [11; 35; 36].  
Acarbose, migiltol and voglibose are well known \(\alpha\)-glucosidase inhibitors capable of suppressing postprandial hyperglycemiacaemia [37; 38; 39; 40]. Indeed, the overall effect of \(\alpha\)-glucosidase inhibition may prevent the development of diabetes [41]. Additionally, edible blackberry water and ethanol extracts have been linked with anti-diabetic effects [42]. In addition to this, some organic extracts of raspberry fruits exhibited a potent anti-\(\alpha\) glucosidase activity [43]. Compared to Chinese coloured grains, the polyphenic extract of the strawberry fruit sample 3 was found to be at least 714-fold more active [44]. In terms of their side effects, natural \(\alpha\)-glucosidase inhibitors are generally considered more promising (safer) than synthetic ones [45].  
Undoubtedly, eating fruit is often linked to a number of obstacles. For example, the pieces spoil too quickly (in other words, there is a very short time where fruit is at its best quality), should be prepared (cut and peeled) before consuming, etc. There is constant interest in offering the consumers new food products of substantial quality that will stimulate its consumption [46]. Consequently, finding an easy and elegant way (or technique) for the preservation and/or storage of sensitive fruits such as strawberries does represent extremely attractive research goal. Unfortunately, traditionally used preservation techniques affect, to a considerable extent, the sensorial and nutritional properties of fruit in general, including soft fruit [47].