A comparative study between the antioxidant properties of peel (flavedo and albedo) and juice of some commercially grown citrus fruit (Rutaceae), grapefruit (Citrus paradisi), lemon (Citrus limon), lime (Citrusxaurantiifolia) and sweet orange (Citrus sinensis) was performed. Different in vitro assays were applied to the volatile and polar fractions of peels and to crude and polar fraction of ju...

Zinc oxide nanoparticles (ZnO-NPs) are known to be one of the multifunctional inorganic compounds which are widely used in everyday applications. This study aims to fabricate ZnO-NPs using grapefruit (Citrus paradisi) peel extract with particle size ranging from 12 to 72 nm. Structural, morphological, and optical properties of the synthesized nanoparticles have been characterized by using UV-Vi...

Peels are major byproducts of the juice processing industry. Citrus peels composed two tissues, namely flavedo (outer layer) and albedo (inner layer). Here, were obtained from peel grapefruit cv. ‘Star ruby’, lemon ‘Akragas’, sweet orange cvs. ‘Tarocco’, ‘Sanguinello’ ‘Moro’. Freeze dried investigated for their functional properties, subjected to enzyme-assisted extraction with pectinase cellul...

The present study was designed to investigate the antiulcer activity of ethyl acetate extract of Citrus decumana (grapefruit) peels. The antiulcerogenic activity was evaluated in water immersion and hypothermic restraint stress models at different doses (150, 250 and 350 mg/kg). The antiulcer potential of the extract was assessed by determining and comparing the ulcerative index and biochemical...

l-Phenylalanine ammonia-lyase (PAL) activity is low in the external layers (flavedo) of intact mature grapefruit peel. Flavedo discs evince upon incubation increasing PAL activity and ethylene production. Light has no effect in enhancing PAL activity in discs. Exogenous ethylene stimulates PAL activity in the flavedo of intact mature grapefruits (half maximum stimulation at 15 ppm); such activi...

W.F. FETT, C. WIJEY, R.A. MOREAU AND S.F. OSMAN. 1999. Ten strains belonging to various Thermomonospora species were tested for their ability to hydrolyse the insoluble plant polyester cutin. One strain, the thermophile T. fusca ATCC 27730, was found to produce a highly inducible cutinase when grown in broth medium containing purified apple cv. Golden Delicious cutin. Apple pomace, tomato peel,...

Secondary plant metabolites (SPMEs) play an important role in plant survival in the environment and serve to establish ecological relationships between plants and other organisms. Communication between plants and microorganisms via SPMEs contained in root exudates or derived from litter decomposition is an example of this phenomenon. In this review, the general aspects of rhizodeposition togeth...

Huanglongbing (HLB) is a plant disease responsible for citrus tree decline, increased fruit drop, and deteriorated quality. Citrus pectin billion-dollar industry which may be impacted by the HLB epidemic. We compared physio-chemical properties of in peel from affected grapefruit collected open-air trees against healthy grown under protective screens (CUPS) at two developmental stages to ascerta...

Citrus plants are able to produce defense compounds such as coumarins and furanocoumarins to cope with herbivorous insects and pathogens. In humans, these chemical compounds are strong photosensitizers and can interact with medications, leading to the "grapefruit juice effect". Removing coumarins and furanocoumarins from food and cosmetics imply additional costs and might alter product quality....