Search results for "citrus"

Rapid differentiation of commercial juices and blends by using sugar profiles obtained by capillary zone electrophoresis with indirect UV detection.

2015

A method for the determination of sugars in several fruit juices and nectars by capillary zone electrophoresis with indirect UV-vis detection has been developed. Under optimal conditions, commercial fruit juices and nectars from several fruits were analyzed, and the sugar and cyclamate contents were quantified in less than 6 min. A study for the detection of blends of high-value juices (orange and pineapple) with cheaper alternatives was also developed. For this purpose, different chemometric techniques, based on sugar content ratios, were applied. Linear discriminant analysis showed that fruit juices can be distinguished according to the fruit type, juice blends also being differentiated. …

Use of polarography as a quality-control method for determining diacetyl in citrus and vegetable juices, yoghurt and butter

2002

The determination of diacetyl permits the detection of microbial growth in the processing of citrus fruit before the appearance of other organoleptic, chemical or microbiological changes. It also makes it possible to detect a break in the cold chain during distribution and sale. The study proposed a polarographic method for the determination of diacetyl that allowed routine analysis with the aim of detecting possible contamination in the citrus juice manufacturing chain (orange and orange-carrot). The analytical performance of the method in terms of a linearity from 0 to 960 microg ml(-1), a recovery of 97 to 98%, a precision of 3.2 to 4.8%, and a sensitivity of 0.2 ng ml(-1) for juices ind…

Protective, antioxidant and antiproliferative activity of grapefruit integropectin on sh-sy5y cells

2021

Tested in vitro on SH-SY5Y neuroblastoma cells, grapefruit IntegroPectin is a powerful protective, antioxidant and antiproliferative agent. The strong antioxidant properties of this new citrus pectin, and its ability to preserve mitochondrial membrane potential and morphology, severely impaired in neurodegenerative disorders, make it an attractive therapeutic and preventive agent for the treatment of oxidative stress-associated brain disorders. Similarly, the ability of this pectic polymer rich in RG-I regions, as well as in naringin, linalool, linalool oxide and limonene adsorbed at the outer surface, to inhibit cell proliferation or even kill, at high doses, neoplastic cells may have open…

Inhibition of foodborne pathogen bacteria by essential oils extracted from citrus fruits cultivated in Sicily

2012

Abstract The antagonistic activity of the essential oils (EOs) extracted by hydrodistillation from the fruit peel of several citrus genotypes (pummelo, grapefruit, orange, kumquat, mandarin and lemon) was evaluated against foodborne pathogen bacteria (43 strains of Listeria monocytogenes , 35 strains of Staphylococcus aureus and 14 strains of Salmonella enterica ). Five commercial EOs were used for comparison. Most of the EOs were more effective against the Gram-positive bacteria rather than Salmonella . EOs of lemon genotypes 14 and 15 showed the best results in terms of number of strains inhibited and width of the inhibition zone. The most susceptible strain of each species ( L. monocytog…

Ex vitro mycorrhization of vitro-derived plantlets of 'Carrizo' citrange [C. Sinensis (L.) Osb. × P. Trifoliata (L.) Raf.]

2015

In this study, vitro-derived plantlets of 'Carrizo' citrange were inoculated with Glomus intraradices during the acclimatization phase, from in vitro to in vivo. Plantlets were grown in presence (+M) and in absence of inoculum (-M) and in addition, in sterile and non-sterile substrate. After three months of culture, some vegetative parameters and the level of infection, varied greatly in the different theses. In particular, the highest formation of new branched roots has been observed in inoculated plantlets cultivated in sterile substrate. Good results were observed also in non-inoculated plantlets cultivated in non-sterile substrate, in presence of endemic inoculum. The same trend was obs…

In mostra la grande diversità degli agrumi mediterranei

2019

Tra scienza, bellezza, curiosità, a Palermo una grande mostra dedicata al patrimonio genetico degli agrumi ha raccolto decine di tipologie di frutti e reperti artistici legati alle prime forme di agrumicoltura industriale siciliana.

In vitro anther culture of several cultivars of Citrus sinensis and Citrus clementina.

2012

The effects of benzyladenine and meta-Topolin on in vitro sprouting and regrowth after encapsulation of C35 citrange [Citrus sinensis (L.) Osb. × Pon…

2016

C35, a hybrid of ‘Ruby Blood’ sweet orange and trifoliate orange, is a promising Citrus rootstock, mainly due to its resistance to Citrus Tristeza Virus (CTV), one of the most serious pathology affecting citriculture. The use of resistant rootstocks, such as citranges, is an efficient tool to fight this plant disease. This implies a continuous increasing demand of resistant rootstocks, in order to carry out the turnover of sour orange, still the most used Citrus rootstock in Italy. Micropropagation, can provide innovative solutions to obtain, in a short time and in a small space, a number of plants higher than traditional propagation. Micropropagation efficiency is also affected by the cult…

GIBBERELLINS REGULATE CELL DIVISION AND PARTHENOCARPIC FRUIT SET IN CITRUS

Fruit set and growth is regulated by hormones interaction, gibberellins (GA) being a main part of the process in Citrus. Actually, it is well known the time-course of GA content in the citrus ovary during flowering and its correlation with fruit set in both seeded and seedless species. However, GA endogenous role is uncertain. Is GA in the ovary a direct regulator or an indirect part of the hormonal stimuli that reactivates and maintains cell division triggering fruit set? While in seeded varieties GA synthesis that occurs in fertilized ovules is the primary stimulus controlling early ovary development, is there any specific tissue-dependent regulation of parthenocarpy? While initiation of …

Carbohydrate and nutritional responses to stem girdling and drought stress with respect to understanding symptoms of Huanglongbing (HLB) in Citrus

2013

The most important worldwide problem in citrus production is the bacterial disease Huanglongbing (HLB; citrus greening) caused by phloem-limited bacterium Candidatus Liberibacter asiaticus. The earliest visible symptoms of HLB on leaves are vein yellowing and an asymmetrical chlorosis referred to as “blotchy mottle”, thought to be the result of starch accumulation. We tested the hypothesis that such visible symptoms are not unique to HLB by stem girdling 2-yr-old seedlings of two citrus rootstocks with and without drought stress in the greenhouse. After 31 d, girdling had little effect on shoot growth but girdling increased the relative growth rate of shoots in drought stressed trees. Starc…