Two new dihydrochalcone enantiomers (+)-1 and (-)-1, along with eight known compounds 3-10, were obtained from Pteris ensiformis. The planar structures were determined on the basis of extensive 1D and 2DNMR and HRESIMS. The resolution of (+)-1 and (-)-1 was achieved by chiral HPLC analysis. The absolute configurations of (+)-1 and (-)-1 were established by the bulkiness rule using Rh₂(O₂CCF₃)₄-...

A number of fern species, belonging to several genera of Pteridaceae, exhibit a more or less conspicuous farinose wax, which is mostly located on the lower leaf surface. Production of these waxes is often correlated with the presence of glandular trichomes. Particularly during the past two decades, a series of publications appeared on the chemical composition of these exudates. The major compon...

Apples are one of the most popular foods around world. However, recently there has been a growing interest in preservation traditional apple varieties. This grown due to studies that suggest apples contain higher amounts polyphenolics and antioxidant activity compared commercial ones. Polyphenolics have gained much attention because their beneficial effects on human health, thus they became qua...

Abstract Bitter is generally undesirable, although it an important part of flavor. substances exhibit diverse health-promoting activities, which in line with the famous Chinese saying "a good medicine tastes bitter". Naringin (NAG) and neohesperidin (NHP), two flavanones that give bitterness to citrus fruits, show various pharmacological activities. Interestingly, their hydrogenation products, ...

We analyzed the red-fleshed apple cultivar ‘Baya Marisa’ and compared it with traditional, white-fleshed ‘Golden Delicious’. The objective of this study was to compare sugars, organic acids, phenolic compounds widely known consumed In addition, flesh firmness, color, soluble solid content studied. A total 46 were quantified identified, some for first time in apples. showed that (TAPC) 1.6× high...

T he m ajo r constituent of the yellow frond exudate of the fern Notholaena sulphurea was iden tified by spectroscopic m ethods as 3 ,5 ,2 '-trihydroxy-7-m ethoxy-8-acetoxy flavone and its struc tu re was confirm ed by synthesis. This novel natural flavonoid was also de tected in the frond exudate of five o ther Notholaena species. In the yellow form of N. sulphurea, the rare 5 ,2 'dihydroxy-7,...

Although extensive literature exists on antioxidant properties of medicinal plants, very few studies have focused on their polyphenolic composition. Here, preliminary phytochemical screening and total flavonoid content in extracts of seeds of Myristica fragrans and leaves of Cordyline terminalis have been investigated. Screening of potential flavonoid-subclasses was done by LC-ESI-MS, whose dat...