1.
Poisonous or non-poisonous plants? DNA-based tools and applications for accurate identification.
Mezzasalma, V, Ganopoulos, I, Galimberti, A, Cornara, L, Ferri, E, Labra, M
International journal of legal medicine. 2017;(1):1-19
Abstract
Plant exposures are among the most frequently reported cases to poison control centres worldwide. This is a growing condition due to recent societal trends oriented towards the consumption of wild plants as food, cosmetics, or medicine. At least three general causes of plant poisoning can be identified: plant misidentification, introduction of new plant-based supplements and medicines with no controls about their safety, and the lack of regulation for the trading of herbal and phytochemical products. Moreover, an efficient screening for the occurrence of plants poisonous to humans is also desirable at the different stages of the food supply chain: from the raw material to the final transformed product. A rapid diagnosis of intoxication cases is necessary in order to provide the most reliable treatment. However, a precise taxonomic characterization of the ingested species is often challenging. In this review, we provide an overview of the emerging DNA-based tools and technologies to address the issue of poisonous plant identification. Specifically, classic DNA barcoding and its applications using High Resolution Melting (Bar-HRM) ensure high universality and rapid response respectively, whereas High Throughput Sequencing techniques (HTS) provide a complete characterization of plant residues in complex matrices. The pros and cons of each approach have been evaluated with the final aim of proposing a general user's guide to molecular identification directed to different stakeholder categories interested in the diagnostics of poisonous plants.
2.
A Randomized, Double-Blind, Placebo-Controlled Trial: The Efficacy of Multispecies Probiotic Supplementation in Alleviating Symptoms of Irritable Bowel Syndrome Associated with Constipation.
Mezzasalma, V, Manfrini, E, Ferri, E, Sandionigi, A, La Ferla, B, Schiano, I, Michelotti, A, Nobile, V, Labra, M, Di Gennaro, P
BioMed research international. 2016;2016:4740907
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A controlled balance between the healthy and harmful intestinal bacterial species is fundamental for maintaining a healthy gut. Recent studies have shown a correlation between microbiota imbalance and onset of IBS-related symptoms, however the available data remains limited and inconclusive. The aim of this trial was to assess the efficacy of multispecies probiotic supplementation on the gut microbiota of 150 patients diagnosed with IBS. Participants were randomly divided into three groups receiving either one of two probiotic mixtures or the placebo for 90 days. Stool samples were analysed and both symptom and quality of life questionnaires were recorded. The multispecies probiotic supplementation administered in this study demonstrated significant amelioration of IBS symptoms and improvement in quality of life. This supports the role of the gut microbiome in IBS and the potential role of multispecies probiotics in managing this disorder.
Abstract
Background and Aim. The efficacy of supplementation treatment with two multispecies probiotic formulates on subjects diagnosed with IBS-C and the assessment of their gut microbiota were investigated. Methods. A randomized, double-blind, three-arm parallel group trial was carried out on 150 IBS-C subjects divided into three groups (F_1, F_2, and F_3). Each group received a daily oral administration of probiotic mixtures (for 60 days) F_1 or F_2 or placebo F_3, respectively. Fecal microbiological analyses were performed by species-specific qPCR to assess the different amount of probiotics. Results. The percentage of responders for each symptom was higher in the probiotic groups when compared to placebo group during the treatment period (t60) and was maintained quite similar during the follow-up period (t90). Fecal analysis demonstrated that probiotics of the formulations increased during the times of treatment only in fecal DNA from subjects treated with F_1 and F_2 and not with F_3, and the same level was maintained during the follow-up period. Conclusions. Multispecies probiotic supplementations are effective in IBS-C subjects and induce a different assessment in the composition of intestinal microbiota. This clinical study is registered with the clinical study registration number ISRCTN15032219.