Fac-simile Scheda Linee di Ricerca - Federalimentare

Dati pubblicati inerenti il tema di ricerca:1 Moresi M., De Santis D., Cerrato A. (2001) L’estrazione di pigmenti da Reseda e Robbia. In:Colture alternative per le aree collinari del Lazio. ARSIAL – Area Studi e Progetti, Roma,pp.51-63.In questo lavoro si sono messe a punto alcune tecniche di estrazione con solventi chimici di pigmenti da alcunespecie tintorie (reseda, Reseda luteola L., e robbia, Rubia tinctorum L.); si sono determinate le condizionioperative ottimali in funzione della granulometria delle matrici vegetali, del rapporto liquido/solido,dell’intensità di miscelazione e del tempo; si è valutata la capacità tintorie di polveri tal quali o di estratti suprovini di cotone e di lana e la stabilità del colore alle più significative prove di solidità nel caso di impiego nellatintura di biancheria intima.2. Cerrato A., De Santis D., Moresi M. (2002) Production of luteolin extracts from reseda luteolaand assessment of their dyeing properties. J Food and Agric. Sci., 82: 1189-1199.In this work several experiments were sequentially performed in 50-cm 3 shaken-tubes and 1-dm 3 stirred extractor,thus allowing methanol to be selected as the most appropriate leaching solvent for luteolin from leaves,stems and flowers of weld (Reseda luteola). The extraction capability of methanol at 25°C was found to be about7 times greater than that of boiling water at pH 10. A composite design experiment allowed the effects of particlesize and liquid-to-solid ratio to be determined, thus resulting in an optimal luteolin extraction yield of 8.6±0.2 gkg -1 of dried weld material when leaching plant particles sieved through 0.5-mm openings with 40 dm 3 ofmethanol kg -1 .Preliminary dyeing tests on premordanted raw cotton and wool standard specimens gave rise to dyed specimenswith the same greenish-yellow hue, but greater or smaller values of lightness and chroma, respectively. Despiteall dyed specimens exhibited a minimum resistance to a simulated acid perspiration solution, the resistance tofading of dyed wool specimens was generally greater than that of cotton ones.3. D. De Santis, M. Moresi, A.M. Gallo, M. Petruccioli (2005) Assessment of the dyeing propertiesof pigments from Monascus purpureus. J Chem Technol. Biotechnol., 80: 1072-1079.Monascus purpureus C322 was cultivated on well established production media to yield prevailingly red or orangepigment-rich ethanolic extracts. Once these extracts had been diluted by an overall factor of 50, they wereused as such to dye raw wool standard specimens differently premordanted using alum or stannic chloride. Independentlyof the mordant used, the specimens dyed with the red pigment-rich extracts showed a pale red colourtending to pink, whereas the specimens dyed with the orange pigment-rich ones exhibited a more definite orangecolour. By carrying out a few colourfastness standard test methods (i.e. manual washing at 40°C, acid and basicperspiration, and hot pressing), stannic chloride premordanted wool specimens dyed with the red pigment-richextracts were found to be less resistant to acid and basic perspiration than the orange counterparts. Since the productionof the orange pigment-rich ethanolic extracts appeared to be more cost-effective than that of the redcounterparts, the former might support the present demand for colorants of natural origin in the textile sector.4. De Santis D., Moresi M. (2007) Production of alizarin extracts from Rubia tinctorum and assessmentof their dyeing properties. Industrial Crops and Products, 26, 151-162.In this work several experiments were performed in 50 cm 3 shaken-tubes, thus allowing methanol to be selectedas the most appropriate leaching solvent for alizarin from roots of common madder (Rubia tinctorum). Methanolat 25°C was found to be able to extract not only free alizarin but also its glycosidic forms, thus resulting in anoverall alizarin extraction yield of 2.9±0.1 g kg -1 of dried material when leaching madder root particles with 100dm 3 of methanol kg -1 . Further extraction tests using a liquid-solid ratio of 40 dm 3 kg -1 in a 1-dm 3 stirred extractorallowed the production of a methanolic extract, which was then dried under vacuum. The solid residues were redissolvedin ethanol so as to avoid methanol vapours exhaling from dyeing baths.Dyed standard specimens of raw cotton and wool exhibited almost the same reddish-yellow hue, even if thosecoloured with the ethanolic extract had a lighter colour intensity and a more pinkish shade than those dyed withRubia root particles. Whatever the dyeing procedure used, the colour intensity or hue of cotton specimens wasfound to be brighter or more pinkish than the wool ones. These characteristics were also more evident for thecotton specimens dyed with the ethanolic extract. The fastness properties of dyed cotton and wool specimenswere evaluated and it was found that all the dyed specimens were not or just slightly affected by manual washingat 40°C, acid or basic perspiration tests, and it was also found that the resistance to fading of dyed wool specimenswas generally greater than that of cotton ones.SISTAL - SOCIETA’ ITALIANA DI SCIENZE E TECNOLOGIE ALIMENTARIDipartimento di Scienze e Tecnologie Agroalimentari, Università degli Studi della TusciaVia San Camillo de Lellis, 01100 ViterboTel.: 0761- 35 74 94/7 , Fax: 0761- 35 74 98, e-mail: mmoresi@unitus.it471