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2.
Diabetes Res Clin Pract ; 205: 110979, 2023 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-37890701

RESUMO

AIMS: Over the recent years multiple therapeutic and management opportunities have been made available to treat pregnant women with Type 1 diabetes (T1DM). However, analyses assessing whether these different approaches may have any specific advantage/disadvantage in metabolic control and neonatal outcomes is still limited. The aim of this study was to compare metabolic control and neonatal outcomes in pregnant women with T1DM among different basal insulins (NPH vs. analogue), insulin administration ways [Multiple Daily Injections (MDI) vs. Continuous Subcutaneous Insulin Infusion (CSII)] and glucose monitoring systems [Self-Monitoring of Blood Glucose (SMBG) vs. real-time/intermittently scanned Continuous Glucose Monitoring (rtCGM/isCGM)]. METHODS: A retrospective analysis on metabolic data and neonatal outcomes of 136 T1DM pregnant women (76% on MDI, based on NPH (51%) or analogue (49%); 24% on CSII; 24% using rtCGM/isCGM), managed between 2008 and 2020, was performed, comparing different therapeutic approaches. RESULTS: Metabolic data and neonatal outcomes were comparable among women treated with different basal insulins. Women on CSII planned their pregnancy more frequently (82 vs. 60%; p = 0.043) and had better pregestational HbA1c (52 ± 5 vs. 60 ± 13 mmol/mol; p = 0.044) and first trimester HbA1c (48 ± 4 vs. 51 ± 8 mmol/mol; p = 0.047). Pregestational and first trimester HbA1c were also lower in women using rtCGM/isCGM (53 ± 8 vs. 58 ± 13 mmol/mol; p = 0.027 and 46 ± 5 vs. 51 ± 7 mmol/mol; p = 0.034, respectively). In the whole cohort, LGA risk was directly correlated to HbA1c at third trimester (correlation coefficient: 0.335, p = 0.001) and inversely correlated to the achievement of HbA1c target (≤6% [<42 mmol/mol]) at third trimester (correlation coefficient: - 0.367, p < 0.001). CONCLUSION: Treatment with insulin analogs didn't significantly change metabolic control and neonatal outcomes in T1DM women, while CSII and rtCGM/isCGM can optimize preconception and first trimester pregnancy glycemic control. Irrespective of the therapeutic management, third trimester HbA1c remains the strongest risk factor for LGA.


Assuntos
Diabetes Mellitus Tipo 1 , Recém-Nascido , Feminino , Humanos , Gravidez , Diabetes Mellitus Tipo 1/tratamento farmacológico , Resultado da Gravidez , Hipoglicemiantes/uso terapêutico , Automonitorização da Glicemia , Hemoglobinas Glicadas , Estudos Retrospectivos , Glicemia/metabolismo , Injeções Subcutâneas , Insulina/uso terapêutico , Glucose/uso terapêutico , Sistemas de Infusão de Insulina
4.
Diabetes Metab Res Rev ; 39(5): e3625, 2023 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-36806857

RESUMO

AIMS: To evaluate the impact of assisted reproductive technology (ART) on the risk of gestational diabetes mellitus (GDM) in single pregnancies. MATERIALS AND METHODS: We retrospectively collected clinical and anthropometric data of 219ART- and 256 age- and body mass index (BMI)-matched women with spontaneous conception screened for GDM. The primary outcome was to evaluate GDM prevalence in ART women. RESULTS: There were no differences in age, BMI, and family history of diabetes in the two groups of women. ART-women were more frequently primiparous, whereas the prevalence of previous GDM was higher in SC-women. The prevalence of GDM in the whole cohort was 36.1% and was higher in ART-women (52.3% vs. 23.4%; p < 0.0001). In the whole cohort, on multivariate analysis, family history of diabetes (OR 1.67; 95% CI: 1.03-2.69), previous GDM (OR 7.05; 95% CI: 2.92-17.04), pre-pregnancy obesity (OR 2.72; 95% CI 1.21-6.13), and ART (OR 4.14; 95% CI 2.65-6.48) were independent risk factors for GDM. Among ART-women, age over 40 years was associated with GDM. Preterm delivery was more common in ART-women; gestational week at delivery, birth weight, ponderal index, and Apgar score were lower in ART-women than in SC-women, both in the whole cohort and in GDM women. CONCLUSIONS: Among women undergoing ART treatment, at least one in two develops GDM. ART appears to be an independent risk factor for GDM in single pregnancies, particularly above the age of 40. ART treatment seems to be associated with an increased rate of preterm delivery and lower neonatal birth weight and Apgar score, especially in GDM women. CLINICAL TRIAL REGISTRATION: The study was not registered as it is an observational retrospective evaluation.


Assuntos
Diabetes Gestacional , Nascimento Prematuro , Gravidez , Recém-Nascido , Feminino , Humanos , Adulto , Diabetes Gestacional/tratamento farmacológico , Estudos Retrospectivos , Nascimento Prematuro/epidemiologia , Nascimento Prematuro/etiologia , Peso ao Nascer , Técnicas de Reprodução Assistida/efeitos adversos , Fatores de Risco , Resultado da Gravidez/epidemiologia
5.
Acta Diabetol ; 60(1): 53-60, 2023 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-36166172

RESUMO

AIMS: To evaluate the impact of adding a glucagon-like peptide-1 receptor agonist (GLP-1 RA) in people with type 2 diabetes (T2D) in basal-bolus (BB) insulin regimen, on insulin requirement, HbA1c, weight loss up to 24 months. METHODS: Data on subjects with T2D on BB who initiated a GLP-1 RA have been retrospectively collected. HbA1c, body weight, and insulin dose were recorded at baseline, 6, 12, and 24 months after initiation of GLP-1 RA therapy. A linear mixed model for repeated measures was used to evaluate the changes in HbA1c, body weight, and insulin requirement over time. RESULTS: We included 156 subjects (63.5% males; age 62 ± 11 years, HbA1c 70 ± 22.0 mmol/mol; 8.6 ± 4.2%). Compared to baseline, HbA1c and body weight were significantly lower at 6 months after introducing a GLP-1RA and remained stable up to 24 months (all p < 0.0001 vs. baseline). At 24 months, 81% of subjects discontinued prandial insulin, while 38.6% discontinued basal insulin as well. Insulin requirement at baseline (aOR 0.144; 95% CI, 0.046-0.456; P = 0.001) was the only significant predictor of prandial insulin discontinuation. CONCLUSIONS: Replacing prandial insulin with GLP-1 RA is a valuable strategy to simplify the BB insulin regimen while improving glycaemic control and promoting weight loss in subjects with T2D.


Assuntos
Diabetes Mellitus Tipo 2 , Masculino , Humanos , Pessoa de Meia-Idade , Idoso , Feminino , Diabetes Mellitus Tipo 2/tratamento farmacológico , Hipoglicemiantes/uso terapêutico , Hemoglobinas Glicadas , Estudos Retrospectivos , Controle Glicêmico , Insulina , Redução de Peso , Peso Corporal , Peptídeo 1 Semelhante ao Glucagon/uso terapêutico , Receptor do Peptídeo Semelhante ao Glucagon 1/agonistas , Glicemia
6.
Cell Mol Biol (Noisy-le-grand) ; 68(4): 144-157, 2022 Apr 30.
Artigo em Inglês | MEDLINE | ID: mdl-35988266

RESUMO

For the purpose of evaluating the local heritage of eastern Numidia, an ethnobotanical survey was conducted on a population located in the province (department) of El-Tarf (North-East of Algeria) on a frequency of use of two plants known in traditional health; Eucalyptus globulus (Myrtaceae) and Rosmarinus officinalis (Lamiaceae). After processing data, our results show a female dominance when using these plants on a fairly advanced age group (40 to 60 years old). These plants are used by the people at their fresh state and deem the leaf as the most used part for therapeutic and cosmetic purposes. Furthermore, steam baths and infusion remain the most widespread preparation methods. Most consumers use these plants to treat influenza, respiratory illnesses as well as diseases of the digestive tract. GC-MS of essential oils extracted from the plants studied disclose a dominance of the alcohols portrayed by the monoterpenes (42.73%), sesquiterpenes (32.6%) and oxides (10.48%) in E. globulus. Data also indicate a high content of oxides (38.11%) monoterpene alcohols (20.43%) and monoterpenes (19.70%) in R.officinalis. Toxicological contact tests were achieved on a store-products pest Ephestia kuehniella. The test results were assessed with E.globulus (LC50=0.013; LC95=0.081 µl/cm2) and R.officinalis (LC50=0.011; LC95=0.059 µl/cm2). The lethal time changes according to the dose used and the tested plant. In E.globulus, we observe (concentration: 0.005 µl/cm2; LT50=56.2 h), (Concentration: 0.01 µl/cm2; LT50=49.53h) and (Concentration: 0.04µl/cm2; LT50=20.93h). Whereas in R.officinalis, we recorded (Concentration: 0.005 µl/cm2; LT50=55.7h), (Concentration: 0.01µl/cm2; LT50=54.99 h) and (Concentration: 0.04µl/cm2; LT50=29.13 h). The bioinsecticide has also been administered by fumigation and underpins toxicity by the reduction of adults longevity in E.kuehniella with R.officinalis (LC50=4.03 µl/l air; LC95=14.73 µl/l air) and E.globulus (LC50=7.76 µl/lair; LC95=21.23 µl/l air). In addition, the tested plants show an outstanding repellent effect as long as E.globulus and  R.officinalis essential oils respectively demonstrate a slightly repellent power at 42.22% (RD50=0.09 µl/cm2 ; RD95=0.24 µl/cm2) and repellent at 60.00% (RD50=0.06 µl/cm2 ; RD95= 0.35 µl/cm2) towards E.kuehniella adults. The plant resources represent a genuine reserve of bioactive molecules, which can create solutions to sustainable development issues. These plants might be the source of new molecules of combat against some pests in order to protect human health and safeguard the environment.


Assuntos
Eucalyptus , Inseticidas , Mariposas , Óleos Voláteis , Rosmarinus , Adulto , Álcoois , Animais , Humanos , Inseticidas/farmacologia , Pessoa de Meia-Idade , Monoterpenos , Óleos Voláteis/farmacologia , Óxidos , Óleos de Plantas
7.
Gynecol Endocrinol ; 38(8): 672-675, 2022 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-35723586

RESUMO

ObjectiveSleep disturbances and short sleep duration are common in pregnancy and might contribute to the development of hyperglycemia. Therefore, we evaluated the association of sleep disturbances and gestational diabetes (GDM) in a cohort of women.MethodsWe collected data of 386 women consecutively screened for GDM in 2019 by 75 gr OGTT, according with IDPSG criteria. Pittsburgh Sleep Quality Index (PSQI) questionnaire was used to assess self-reported poor sleep quality (PSQI score >5) and short nocturnal sleep duration (<6 h).ResultsOf 386 women, 148 (38.3%) had poor sleep quality and 87 (22.5%) short sleep duration. GDM prevalence was 26.9%. There was no difference in GDM prevalence between women with poor or good sleep quality (26% vs. 28%; n.s.), while GDM was more frequent in women with short sleep duration (35.6% vs. 24.4%; p = 0.038). On univariate logistic regression analysis, short sleep duration (OR 1.71; 95%CI: 1.03-2.86; p = 0.039), previous GDM (OR 3.52; 95%CI: 1.83-6.76; p < 0.0001), family history of diabetes (OR 1.96; 95%CI: 1.21-3.91; p = 0.007), pre-pregnancy overweight (OR 1.85; 95%CI: 1.06-3.23; p = 0.031) or obesity (OR 2.56; 95%CI: 1.40-4.70; p = 0.002) were associated to GDM. However, after adjustment for confounders, short sleep duration did not persist as an independent risk factor for GDM (OR: 1.55; 95%CI: 0.91-2.65; ns).ConclusionsSleep disturbances are relative common among pregnant women. Although GDM seems more common among women with short sleep duration, this sleep disturbance does not seem to be an independent risk factor for GDM in women at high risk.


Assuntos
Diabetes Gestacional , Transtornos do Sono-Vigília , Diabetes Gestacional/epidemiologia , Diabetes Gestacional/etiologia , Feminino , Humanos , Gravidez , Fatores de Risco , Sono , Transtornos do Sono-Vigília/complicações , Transtornos do Sono-Vigília/epidemiologia , Fatores de Tempo
8.
Front Plant Sci ; 12: 723879, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34484283

RESUMO

The recent outbreak of the Olive Quick Decline Syndrome (OQDS), caused by Xylella fastidiosa subsp. pauca (Xf), is dramatically altering ecosystem services in the peninsula of Salento (Apulia Region, southeastern Italy). Here we report the accomplishment of several exploratory missions in the Salento area, resulting in the identification of thirty paucisymptomatic or asymptomatic plants in olive orchards severely affected by the OQDS. The genetic profiles of such putatively resistant plants (PRPs), assessed by a selection of ten simple sequence repeat (SSR) markers, were compared with those of 141 Mediterranean cultivars. Most (23) PRPs formed a genetic cluster (K1) with 22 Italian cultivars, including 'Leccino' and 'FS17', previously reported as resistant to Xf. The remaining PRPs displayed relatedness with genetically differentiated germplasm, including a cluster of Tunisian cultivars. Markedly lower colonization levels were observed in PRPs of the cluster K1 with respect to control plants. Field evaluation of four cultivars related to PRPs allowed the definition of partial resistance in the genotypes 'Frantoio' and 'Nocellara Messinese'. Some of the PRPs identified in this study might be exploited in cultivation, or as parental clones of breeding programs. In addition, our results indicate the possibility to characterize resistance to Xf in cultivars genetically related to PRPs.

9.
Diabetes Res Clin Pract ; 178: 108943, 2021 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-34245795

RESUMO

In this observational study, we assessed the association between use of non-nutritive-sweetened soft drink (NNSSD) and risk of gestational diabetes (GDM) in 376 pregnant women consecutively screened for GDM, observing that NNSSD consumption is common among pregnant women and is associated with an increased risk of GDM, independently from traditional risk factors.


Assuntos
Diabetes Gestacional , Bebidas Gaseificadas , Diabetes Gestacional/epidemiologia , Diabetes Gestacional/etiologia , Feminino , Humanos , Gravidez , Fatores de Risco
10.
Eur Thyroid J ; 10(3): 237-247, 2021 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-34178710

RESUMO

OBJECTIVES: The thymus plays a central role in immune tolerance, which prevents autoimmunity. Myasthenia gravis (MG) is commonly associated with thymoma or thymus hyperplasia, and it can coexist with autoimmune thyroid diseases. However, the role of the thymus in thyroid autoimmunity remains to be clarified, which we investigated here. STUDY DESIGN: The study design entailed the inclusion of consecutive MG patients and the measurement of anti-thyroid autoantibodies at baseline and, limited to autoantibody-positive patients, also at 24 and 48 weeks. One hundred and seven MG patients were studied. The main outcome measure was the behaviour of anti-thyroglobulin autoantibodies (TgAbs) and anti-thyroperoxidase autoantibodies (TPOAbs) over time in relation to thymectomy. RESULTS: Serum TgAbs and/or TPOAbs were detected in ∼20% of patients in the absence of thyroid dysfunction. The prevalence of positive serum TgAbs and/or TPOAbs decreased significantly (p = 0.002) over the follow-up period in patients who underwent thymectomy, but not in patients who were not thymectomized. When the analysis was restricted to TgAbs or TPOAbs, findings were similar. On the same line, there was a general trend towards a reduction in the serum concentrations of anti-thyroid autoantibodies in patients who underwent thymectomy, which was significant for TPOAbs (p = 0.009). CONCLUSIONS: Our findings suggest a role of the thymus in the maintenance of humoral thyroid autoimmunity.

11.
J Endocrinol Invest ; 44(12): 2575-2579, 2021 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-33844165

RESUMO

OBJECTIVE: Graves' orbitopathy (GO) reflects an autoimmune response against antigens expressed by the thyroid and orbital tissues. Elimination of thyroid antigens may be beneficial for GO. Total thyroid ablation (TTA) [thyroidectomy (Tx), followed by 30 mCi of radioiodine] was shown to exert a beneficial effect on GO following intravenous glucocorticoids (ivGC) compared with Tx alone. Here, we investigated retrospectively whether TTA performed with a 15 mCi of radioiodine still maintains advantages over Tx. METHODS: Thirty-two subjects, 13 treated with TTA (performed with 15 mCi of radioiodine) and 19 with Tx alone, all with moderately severe, active GO, treated with ivGC, were studied. The primary objective was the outcome of GO at 24 weeks based on a composite evaluation. RESULTS: The two groups did not differ at baseline in terms of sex, age, smoking habits, TSH, anti-TSH receptor autoantibodies, GO duration and eye features. The proportion of GO responders at 24 weeks was greater in the TTA (61.5%) than in the Tx group (26.3%, P = 0.046). In contrast, GO outcome at 48 weeks did not differ between the two groups (69.2% vs 52.6% of responder in TTA and Tx group, respectively). The outcome of the individual GO features did not differ between the two groups both a 24 and 48 months. CONCLUSIONS: The advantage of total thyroid ablation seems to be a more rapid response for GO to ivGC treatment. Prospective, randomized studies in a larger number of subjects are needed to confirm our findings.


Assuntos
Técnicas de Ablação/métodos , Glucocorticoides/administração & dosagem , Oftalmopatia de Graves , Radioisótopos do Iodo/uso terapêutico , Tireoidectomia/métodos , Administração Intravenosa , Terapia Combinada , Relação Dose-Resposta à Radiação , Feminino , Oftalmopatia de Graves/sangue , Oftalmopatia de Graves/diagnóstico , Oftalmopatia de Graves/terapia , Humanos , Imunoglobulinas Estimuladoras da Glândula Tireoide/sangue , Masculino , Pessoa de Meia-Idade , Doses de Radiação , Índice de Gravidade de Doença , Resultado do Tratamento
12.
Pathogens ; 9(9)2020 Aug 20.
Artigo em Inglês | MEDLINE | ID: mdl-32825425

RESUMO

During their evolutionary history, plants have evolved the ability to synthesize and accumulate small molecules known as secondary metabolites. These compounds are not essential in the primary cell functions but play a significant role in the plants' adaptation to environmental changes and in overcoming stress. Their high concentrations may contribute to the resistance of the plants to the bacterium Xylella fastidiosa, which has recently re-emerged as a plant pathogen of global importance. Although it is established in several areas globally and is considered one of the most dangerous plant pathogens, no cure has been developed due to the lack of effective bactericides and the difficulties in accessing the xylem vessels where the pathogen grows and produces cell aggregates and biofilm. This review highlights the role of secondary metabolites in the defense of the main economic hosts of X. fastidiosa and identifies how knowledge about biosynthetic pathways could improve our understanding of disease resistance. In addition, current developments in non-invasive techniques and strategies of combining molecular and physiological techniques are examined, in an attempt to identify new metabolic engineering options for plant defense.

13.
Pathogens ; 9(4)2020 Apr 07.
Artigo em Inglês | MEDLINE | ID: mdl-32272699

RESUMO

Bois noir is a disease associated with the presence of phytoplasma 'Candidatus Phytoplasma solani' belonging to the Stolbur group (subgroup 16SrXII-A), which has a heavy economic impact on grapevines. This study focused on the changes induced by phytoplasma in terms of the profile and amount of secondary metabolites synthesized in the phenylpropanoid pathway in leaves of Vitis vinifera L. red-berried cultivar Sangiovese. Metabolic alterations were assessed according to the disease progression through measurements of soluble sugars, chlorophyll, and phenolic compounds produced by plant hosts, in response to disease on symptomatic and asymptomatic Bois noir-positive plants. Significant differences were revealed in the amount of soluble sugars, chlorophyll, and accumulation/reduction of some compounds synthesized in the phenylpropanoid pathway of Bois noir-positive and negative grapevine leaves. Our results showed a marked increase in phenolic and flavonoid production and a parallel decrease in lignin content in Bois noir-positive compared to negative leaves. Interestingly, some parameters (chlorophyll a, soluble sugars, total phenolic or flavonoids content, proanthocyanidins, quercetin) differed between Bois noir-positive and negative leaves regardless of symptoms, indicating measurable biochemical changes in asymptomatic leaves. Our grapevine cultivar Sangiovese results highlighted an extensive modulation of the phenylpropanoid biosynthetic pathway as a defense mechanism activated by the host plant in response to Bois noir disease.

14.
Plants (Basel) ; 8(11)2019 Oct 23.
Artigo em Inglês | MEDLINE | ID: mdl-31652681

RESUMO

Due to global climate change, complex combinations of stresses are expected to occur, among which the interaction between pathogens and drought stress may have a significant effect on growth and yield. In this study, the Xylella fastidiosa (Xf)-resistant cultivar Leccino and the susceptible one Cellina di Nardò were subjected to (a) individual drought stress, (b) Xf infection and (c) combination of both stress conditions. Here we report the physiological response to stresses in water content in leaves and the modulation in the expression level of seven genes responsive to plant water status and pathogen infection. In Xf-resistant plants, higher expression levels are reported for genes belonging to ROS-scavenging systems and for genes involved in pathogen stress (pathogenesis-related, PR, and leucine-rich repeat genes, LRR-RLK). However, PR and LRR-RLK were not further induced by water deficit. Interestingly, the genes related to drought response (aquaporin, PIP2.1, dehydration responsive element binding, DREB, and dehydrin, DHN), which induction was higher in Cellina di Nardò compared to Leccino during drought stress, was poorly induced in Xf-susceptible plants when Xf occur. Conversely, DHN was induced by Xf presence in Leccino. These results were consistent with observations on water content. Indeed, response was similar in Leccino regardless kind of stress or combination, whereas a strong reduction was observed in Xf-susceptible plants infected by Xf or in presence of combined stresses. Thus, the reported findings indicate that resistance of Leccino to Xf could be linked to its lower resistance to water stress, probably leading to the activation of alternative defense pathways that support the plant in Xf response.

15.
Sci Rep ; 9(1): 9602, 2019 07 03.
Artigo em Inglês | MEDLINE | ID: mdl-31270378

RESUMO

In olive trees, Xylella fastidiosa colonizes xylem vessels and compromises water transport causing the olive quick decline syndrome (OQDS). The loss of hydraulic conductivity could be attributed to vessel occlusions induced both by the bacteria biofilm and by plant responses (tyloses, gums, etc.) that could trigger embolism. The ability of the infected plants to detect embolism and to respond, by activating mechanisms to restore the hydraulic conductivity, can influence the severity of the disease symptomatology. In order to investigate these mechanisms in the X. fastidiosa-resistant olive cultivar Leccino and in the susceptible Cellina di Nardò, sections of healthy olive stems were analysed by laser scanning microscope to calculate the cavitation vulnerability index. Findings indicated that the cultivar Leccino seems to be constitutively less susceptible to cavitation than the susceptible one. Among the vascular refilling mechanisms, starch hydrolysis is a well-known strategy to refill xylem vessels that suffered cavitation and it is characterized by a dense accumulation of starch grains in the xylem parenchima; SEM-EDX analysis of stem cross-sections of infected plants revealed an aggregation of starch grains in the Leccino xylem vessels. These observations could indicate that this cultivar, as well as being anatomically less susceptible to cavitation, it also could be able to activate more efficient refilling mechanisms, restoring vessel's hydraulic conductivity. In order to verify this hypothesis, we analysed the expression levels of some genes belonging to families involved in embolism sensing and refilling mechanisms: aquaporins, sucrose transporters, carbohydrate metabolism and enzymes related to starch breakdown, alpha and beta-amylase. The obtained genes expression patterns suggested that the infected plants of the cultivar Leccino strongly modulates the genes involved in embolism sensing and refilling.


Assuntos
Olea/metabolismo , Xylella/fisiologia , Xilema/fisiologia , Aquaporinas/metabolismo , Suscetibilidade a Doenças , Microscopia Eletrônica de Varredura , Olea/microbiologia , Doenças das Plantas/genética , Doenças das Plantas/microbiologia , Proteínas de Plantas/metabolismo , Caules de Planta/metabolismo , Amido/metabolismo , Xilema/anatomia & histologia , beta-Amilase/metabolismo
16.
Antioxidants (Basel) ; 8(6)2019 Jun 05.
Artigo em Inglês | MEDLINE | ID: mdl-31195713

RESUMO

In the last years, the interest in Italian monovarietal oils has increased due to their specific organoleptic qualities. Extra virgin olive oils (EVOOs) are rich in phenolic compounds, secondary metabolites well known and studied for their nutraceutical properties. However, among EVOOs, there is great variability in phenolic composition due to the origin, the production technique, and mainly, the genotype. The aim of this work was to evaluate the different phenolic profiles and the antioxidant activities of monovarietal oils. The results confirm this variability. In fact, the overall content of oleuropein varies up to four times between the different genotypes (from 33.80 to 152.32 mg/kg oil), while the oleocanthal content is significant only in two oils. The antioxidant activity, determined with 2,2-Diphenyl-1-picrylhydrazyl (DPPH) and oxygen radical absorbance capacity (ORAC) assays, is correlated with the content of total phenolic substances, with half maximal inhibitory concentration (IC50) values for the DPPH test ranging from 160 to 91 mg of oil, while the ORAC test shows values between 5.45 and 8.03 µmol Trolox equivalent (TE)/g oil.

17.
Antioxidants (Basel) ; 8(5)2019 May 18.
Artigo em Inglês | MEDLINE | ID: mdl-31109100

RESUMO

The olive tree "Cellina di Nardò" (CdN) is one of the most widespread cultivars in Southern Italy, mainly grown in the Provinces of Lecce, Taranto, and Brindisi over a total of about 60,000 hectares. Although this cultivar is mainly used for oil production, the drupes are also suitable and potentially marketable as table olives. When used for this purpose, olives are harvested after complete maturation, which gives to them a naturally black color due to anthocyanin accumulation. This survey reports for the first time on the total phenolic content (TPC), anthocyanin characterization, and antioxidant activity of CdN olive fruits during ripening and after fermentation. The antioxidant activity (AA) was determined using three different methods. Data showed that TPC increased during maturation, reaching values two times higher in completely ripened olives. Anthocyanins were found only in mature olives and the concentrations reached up to 5.3 g/kg dry weight. AA was determined for the four ripening stages, and was particularly high in the totally black olive fruit, in accordance with TPC and anthocyanin amounts. Moreover, the CdN olives showed a higher TPC and a greater AA compared to other black table olives produced by cultivars commonly grown for this purpose. These data demonstrate the great potential of black table CdN olives, a product that combines exceptional organoleptic properties with a remarkable antioxidant capacity.

18.
Molecules ; 24(10)2019 May 24.
Artigo em Inglês | MEDLINE | ID: mdl-31137706

RESUMO

Olive leaf extracts are of special interest due to their proven therapeutic effects. However, they are still considered a by-product of the table olive and the oil industries. In order to learn possible ways of exploiting this waste for health purposes, we investigated the phytochemical profiles and antioxidant activities in the leaves of 15 Italian Olea europaea L. cultivars grown in the same pedoclimatic conditions. The phenolic profiles and amounts of their seven representative compounds were analyzed using HPLC ESI/MS-TOF. The antioxidant activities were determined using three different antioxidant assays (DPPH, ORAC, and superoxide anion scavenging assay). Wide ranges of total phenolic content (11.39-48.62 g GAE kg-1 dry weight) and antioxidant activities (DPPH values: 8.67-29.89 µmol TE mg-1 dry weight, ORAC values: 0.81-4.25 µmol TE mg-1 dry weight, superoxide anion scavenging activity values: 27.66-48.92 µmol TE mg-1 dry weight) were found in the cultivars. In particular, the cultivars Itrana, Apollo, and Maurino, showed a high amount of total phenols and antioxidant activity, and therefore represent a suitable natural source of biological compounds for use in terms of health benefits.


Assuntos
Antioxidantes/análise , Olea/química , Compostos Fitoquímicos/análise , Folhas de Planta/química , Calibragem , Limite de Detecção , Fenóis/análise , Extratos Vegetais/química
19.
Small ; 15(26): e1804418, 2019 06.
Artigo em Inglês | MEDLINE | ID: mdl-30734483

RESUMO

DNA self-assembly is a powerful tool to arrange optically active components with high accuracy in a large parallel manner. A facile approach to assemble plasmonic antennas consisting of two metallic nanoparticles (40 nm) with a single colloidal quantum dot positioned at the hot spot is presented here. The design approach is based on DNA complementarity, stoichiometry, and steric hindrance principles. Since no intermediate molecules other than short DNA strands are required, the structures possess a very small gap (≈ 5 nm) which is desired to achieve high Purcell factors and plasmonic enhancement. As a proof-of-concept, the fluorescence emission from antennas assembled with both conventional and ultrasmooth spherical gold particles is measured. An increase in fluorescence is obtained, up to ≈30-fold, compared to quantum dots without antenna.


Assuntos
DNA/química , Fluorescência , Nanopartículas Metálicas/química , Pontos Quânticos/química , Nanotecnologia/métodos
20.
Nat Prod Res ; 33(3): 439-442, 2019 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-29553808

RESUMO

We report the characterisation of Salvia clandestina L. shoots and roots aqueous extract using HPLC-ESI/MS-TOF. Among the 29 compounds detected, we observed the presence of danshensu (3-(3,4-dihydroxy-phenyl) 2-hydroxy-propinic acid), a powerful antioxidant and a cardio-protective agent. The danshensu content found in the shoots of S. clandestina was considerable (4.96 mg g-1 DW) if compared with previous studies on S. miltiorrhiza Bunge, the main source of this compound. We also determined the total phenolic concentration and we evaluated their antioxidant activity by ABTS, FRAP and Superoxide anion scavenging methods. All the three assays confirmed a greater antioxidant activity for the shoots in comparison to roots. S. clandestina shoots may represent a valuable and natural unexploited source of danshensu and other phenolic compounds, so that it may be useful for future applications in functional foods and pharmaceutical industries.


Assuntos
Lactatos/isolamento & purificação , Salvia/química , Antioxidantes/química , Antioxidantes/isolamento & purificação , Cardiotônicos/química , Cardiotônicos/isolamento & purificação , Cromatografia Líquida de Alta Pressão , Lactatos/análise , Fenóis/análise , Extratos Vegetais/análise , Extratos Vegetais/química , Brotos de Planta/química
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