Berry components inhibit α-glucosidase in vitro: Synergies between acarbose and polyphenols from black currant and rowanberry
Polyphenol-rich extracts from certain berries inhibited α-glucosidase activity in vitro. The two most effective berry extracts, from black currant and rowanberry, inhibited α-glucosidase with IC50 values respectively of 20 and 30 μg GAE/ml and were as effective as the pharmaceutical inhibitor, acarbose. These berry extracts differed greatly in their polyphenol composition: black currant was dominated […]
Screening Natural Antioxidants in Peanut shell Using DPPH-HPLC-DAD-TOF/MS methods.
Peanutshell, a byproduct in oil production, is rich in naturalantioxidants. Here, a rapid and efficient method using DPPH-HPLC-DAD-TOF/MS was used for the first time to screen antioxidants in peanutshell. The method is based on the hypothesis that upon reaction with 1, 1-diphenyl-2-picrylhydrazyl (DPPH), the peak areas of compounds with potential antioxidant activities in the HPLC […]
Enzyme activity and biochemical changes of three date palm cultivars with different softening pattern during ripening
The physicochemical composition changes during palm ripening were studied. The activities of invertase and cell wall-modifying enzymes, namely pectin methylesterase (PME), β-galactosidase (β-Gal), endo-1,4-β-d-glucanase (EGase), and cellulase were monitored during growth and ripening of Shahani, Piaro and Deiry cultivars with different texture. Also we estimated the concentrations of six organic acids by HPLC .Reducing sugars, […]
Phytochemical composition and antioxidant capacity of various botanical parts of the fruits of Prunus x domestica L. from the Lorraine region of Europe
Mirabelle plums represent a famous fruit from the Lorraine region, however little is known about their phytochemical composition. The oil of the fruit contained predominantly oleic acid (59%) and linoleic acid (29%). The total content of phenolic antioxidants in the whole fruits was 5.338 g/kg with 456 mg/kg (9%), 701 mg/kg (13%) and 4159 mg/kg […]
Inductively coupled plasma-mass spectrometry (ICP-MS) and -optical emission spectroscopy (ICP–OES) for determination of essential minerals in closed acid digestates of peanuts (Arachis hypogaea L.).
Validated methods to measure the essential mineral composition of food matrices are needed to satisfy the analytical requirements of product development, quality control, and food regulatory authorities. We investigated the use of inductively coupled plasma–optical emission spectroscopy (ICP–OES) and -mass spectrometry (ICP-MS), with and without the use of a dynamic reaction cell (DRC), to analyse […]
Bioactivity and chemical composition of blackcurrant (Ribes nigrum) cultivars with and without pesticide treatment
Eleven blackcurrant cultivars grown with pesticide (PT) and without pesticide treatment (PF) were evaluated to compare the differences in plant growth and physical condition; total anthocyanin content; ascorbic acid content; total antioxidant capacity; effect on prostaglandin E2 (PGE2) production and anticancer cell proliferation activities. Results showed that the yield and growth of PT blackcurrants were […]
Chemical and Structural Characterisation of Almond Oil Bodies and Bovine Milk Fat Globules
Lipids in almonds are present as oil bodies in the nut. These oil bodies are surrounded by a membrane of proteins and phospholipids and are a delivery vehicle of energy in the form of triglycerides; similarly to the more studied bovine milk fat globule membrane. Chemical; physical and microscopic analyses revealed major differences in the […]
Profiling of bioactive compounds in cultivars of Runner and Valencia peanut market-types using liquid chromatography/APCI mass spectrometry
Peanuts are classified into four market-types (Runners; Spanish; Virginia and Valencia) Studies on their phytochemical composition have focused mainly on market-types other than Valencia. The objectives of this study are to evaluate the phytochemical composition of cultivars of Valencia and Runner market-types. Extracts of twenty-five peanut cultivars of Runner and Valencia market-types were analyzed using […]
Analysis of roasted and unroasted Pistacia terebinthus volatiles using direct thermal desorption-GCxGC-TOF/MS
The objective of this study was to determine the effects of roasting time on volatile components of Pistacia terebinthus L.; a fruit growing wild in Turkey. The whole fruit samples were pan roasted for 0; 5; 10; 15; 20 and 25 min at 200 °C. Volatile compounds were isolated and identified using the direct thermal […]
Phenolic compound content of fresh and dried figs (Ficus carica L.)
Eighteen fig cultivars commonly grown in the south-eastern Spain were collected in two crops (spring and summer) and their polyphenolic profile was determined. Fruit from the first crop generally showed higher phenolic values than those from the second. Higher concentrations of total phenolics were found in skin than in flesh. LC-UV-DAD/ESI-MSn analysis of the figs […]