30 research outputs found

    Chemical Characterization of a Collagen-Derived Protein Hydrolysate and Biostimulant Activity Assessment of Its Peptidic Components

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    Protein hydrolysates (PHs) are plant biostimulants consisting of oligopeptides and free amino acids exploited in agriculture to increase crop productivity. This work aimed to fractionate a commercial collagen-derived protein hydrolysate (CDPH) according to the molecular mass of the peptides and evaluate the bioactivity of different components. First, the CDPH was dialyzed and/or filtrated and analyzed on maize, showing that smaller compounds were particularly active in stimulating lateral root growth. The CDPH was then fractionated through fast protein liquid chromatography and tested on in vitro grown tomatoes proving that all the fractions were bioactive. Furthermore, these fractions were characterized by liquid chromatography-electrospray ionization- tandem mass spectrometry revealing a consensus sequence shared among the identified peptides. Based on this sequence, a synthetic peptide was produced. We assessed its structural similarity with the CDPH, the collagen, and polyproline type II helix by comparing the respective circular dichroism spectra and for the first time, we proved that a signature peptide was as bioactive as the whole CDPH

    A [68Ga]Ga-DOTANOC PET/CT radiomic model for non-invasive prediction of tumour grade in pancreatic neuroendocrine tumours

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    Predicting grade 1 (G1) and 2 (G2) primary pancreatic neuroendocrine tumour (panNET) is crucial to foresee panNET clinical behaviour. 51 patients with G1-G2 primary panNET demonstrated by pre-surgical [68Ga]Ga-DOTANOC PET/CT and diagnostic conventional imaging were grouped according to the tumour grade assessment method: histology on the whole excised primary lesion (HS) or biopsy (BS). First-order and second-order radiomic features (RFs) were computed from SUV maps for the whole tumour volume on HS. The RFs showing the lowest p-values and the highest Area Under the Curve (AUC) were selected. Three radiomic models were assessed: A (trained on HS, validated on BS), B (trained on BS, validated on HS), C (using the cross-validation on the whole dataset). The second-order Normalized homogeneity and Entropy was the most effective RFs couple predicting G2 and G1. The best performance was achieved by model A (test AUC=0.90, sensitivity=0.88, specificity=0.89), followed by model C (median test AUC=0.87, sensitivity=0.83, specificity=0.82). Model B performed worse. Using HS to train a radiomic model leads to the best prediction, although a “hybrid” (HS+BS) population performs better than biopsy-only. The non-invasive prediction of panNET grading may be especially useful in lesions not amenable to biopsy while [68Ga]Ga-DOTANOC heterogeneity might recommend FDG PET/CT

    Glucuronide directed molecularly imprinted solid-phase extraction: isolation of testosterone glucuronide from its parent drug in urine

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    Solid phase extraction (SPE) from urine by using SPE material (molecularly imprinted polymer (MIP) specifically synthesized to recognize and extract testosterone and testosterone glucuronide. Qualitative and quantitative HPLC analysis of testosterone and its metabolite. Estrazione in fase solida (SPE) da urine di sostanza avente attivitĂ  biologica e tossicologica (testosterone) mediante materiale per SPE altamente specifico, sintetizzato e progettato allo scopo; successiva analisi quali-quantitativa del testosterone e suo metabolita (glucuronide

    Proximal-type epithelioid sarcoma of the mons pubis: report of a case..

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    Abstract INTRODUCTION: Proximal-type epithelioid sarcoma (PES) represents an extremely rare and aggressive form of soft tissue neoplasm, typically presenting as a painless subcutaneous nodule in the trunk often located in the genital area. CASE REPORT: A 46-year-old female was subjected to the excision of a growing soft tissue mass in the mons pubis that, at histology, was identified as PES. The tumor showed an extreme aggressiveness involving subsequently adjoining structures and lymph nodes despite subsequent wide surgical resections during the following months. DISCUSSION: Gynecologists should pay careful attention to all soft tissue masses of the perineal area or external genitalia. It is important to know the possible genital localization of PES which, although rare, is an aggressive high-grade soft tissue tumor with a deceitful behavior, poorly sensitive to chemotherapy and radiotherapy. Surgery, though wide and demolitive, often fails to obtain the necessary radicality

    Synthesis and chromatographic evaluation of molecularly imprinted polymers prepared by the substructure approach for the class-selective recognition of glucuronides

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    Synthesis of molecularly imprinted polymers (MIPs) to be used as SPE material for the specific extraction of glucuronides. Application to cotinine, mycophenolic acid and testosterone glucuronides. Sintesi di materiale per SPE altamente specifico per il riconoscimento (analisi qualitativa) e quantitativa di metaboliti (glucuronidi) di sostanze aventi attivitĂ  biologica o tossicologica (cotinina, acido micofenolico, testosterone