https://www.alice.cnptia.embrapa.br/alice/handle/item/205 Artigo em periódico indexado (CNPDIA) Thu, 23 Jul 2026 05:49:27 GMT 2026-07-23T05:49:27Z https://www.alice.cnptia.embrapa.br/alice/handle/doc/1188468 Título: Design of Experiments for the Synthesis of MMT/TiO2/Ag Composites: Integrating Adsorption and Photocatalysis under Artificial UV and Natural Sunlight for Ethylene Degradation. Autoria: FÁVARO, Y. B.; FIDELIS, M. Z.; LENZI, G. G.; MOTHEO, A. J.; FERREIRA, M. D.; AZEREDO, H. M. C. de Conteúdo: Postharvest deterioration caused by ethylene (C2H4) is a major challenge for global food security, leading to significant losses of perishable products like bananas. In this study, we present the synthesis and optimization of a multicomponent photocatalyst based on montmorillonite (MMT), titanium dioxide (TiO2), and silver (Ag), designed for efficient ethylene remediation. The catalysts were prepared via wet impregnation and characterized using FESEM, EDS, and UV−vis reflectance spectroscopy, which confirmed the successful integration of components and a homogeneous elemental distribution. The bandgap energies were determined to be in the range of 3.02 to 4.10 eV, with MMT-rich samples showing values around 3.12 eV. Through a 23 factorial design, the performance was evaluated under three distinct scenarios: adsorption, artificial UV photocatalysis, and natural sunlight-driven photocatalysis. Sample Amt 09 (1.5% TiO2 and 1% Ag) achieved an ethylene removal of over 92% in the artificial UV photocatalysis scenario. Sample Amt 10 (5% MMT, 1.5% TiO2, and 1% Ag) stood out with high performance across all scenarios, suggesting synergistic effects between adsorption and catalytic degradation. Furthermore, an optimized formulation (5% MMT and 2.73% TiO2) achieved 65% ethylene removal under UV light and 47% under natural sunlight. These findings highlight the potential of MMT/TiO2/Ag composites as sustainable, light-driven solutions for postharvest management, offering a scalable platform to extend the shelf life of fresh produce and reduce global food waste. Thu, 01 Jan 2026 00:00:00 GMT https://www.alice.cnptia.embrapa.br/alice/handle/doc/1188468 2026-01-01T00:00:00Z https://www.alice.cnptia.embrapa.br/alice/handle/doc/1188379 Título: Fluorescence Behavior of Water-Soluble Porphyrins Immobilized on LTA Zeolite and Its Chlorogenic Acid Polyphenol Sensing in Coffee Wastewater. Autoria: MALAFATTI, J. O. D.; MAGNA, G.; PIZZOLI, F.; CAROLEO, F.; D'OTTAVI. C.; FREITAS, W. da S.; MOREIRA, A. J.; PARIS, E. C.; MATTOSO, L. H. C.; DI NATALE, C.; PAOLESSE, R. Conteúdo: Chlorogenicacid(CGA) isoneof themostcommonpolyphenols foundin manyfruits, suchascoffeecherries,andisamongthemosteconomical commoditiesworldwide. Incoffeeproduction,processingandwashing requirelargeamountsofwater,makingwastewatermonitoringessential to preventenvironmental impact.Thisworkreportsthedevelopmentofa fluorescence-basedhybridsensordesignedforthedetectionofCGAusing water-solubleporphyrins immobilizedonhierarchicalLTAzeolite.Thesystem isbasedon5,10,15,20-tetrakis(N-methyl-4-pyridyl)porphyrin(TMPyP)andits Zn(II)-metallatedderivative(ZnTMPyP), synthesizeddirectlyonthezeolite surfaceviaion-exchangeprocesses.Thehybridmaterials(LTA/TMPyPand Zn-LTA/TMPyP)werefullycharacterized, confirmingthepreservationof the zeolitestructureandtheformationof themetalloporphyrincomplexwithin theintercrystallinevoidnetwork.Fluorescencemeasurements inphosphate buffer(pH7.4)showedthatZn-LTA/TMPyPexhibitedthebestperformance forCGAdetection,withadetectionlimit(LOD)of0.22nM.Tomitigate potential interferencefromcaffeineandcaffeicacid,anovel sensingprotocol was implementedusingthesecompoundsasacontrolledbackground, maintaininghighsensitivity(LOD=0.64nmolL-1).Whentestedinreal coffeewashingwater, thesensorquantifiedCGAat2.5 0.7nmolL-1.The measurementaccuracywasvalidatedusinganonlinearstandardaddition method, yieldingarecoveryof96.4%, confirmingthesensor’sabilityto compensateforcomplexmatrixeffects.TheresultsshowthattheZn LTA/TMPyPhybridmaterial isahighlyefficient, stable,andselective platformforCGAmonitoring,withstrongpotential for integrationinto portabledevices forenvironmentalandagro-industrialapplications. Thu, 01 Jan 2026 00:00:00 GMT https://www.alice.cnptia.embrapa.br/alice/handle/doc/1188379 2026-01-01T00:00:00Z https://www.alice.cnptia.embrapa.br/alice/handle/doc/1188325 Título: Detection of green coffee oil adulteration using time-domain nuclear magnetic resonance relaxometry and infrared spectroscopies. Autoria: PAIVA, V. S.; COUTINHO, I. D.; DUTRA, L. A.; ZACHARIAS, M. B.; COLNAGO, L. A.; MORAES, T. B. de Conteúdo: Green coffee oil (GCO) is a high-value product widely used in the food, cosmetic, and pharmaceutical industries, being susceptible to adulteration with low-cost vegetable oils. This study aimed to develop rapid and non- destructive methods based on time-domain nuclear magnetic resonance (TD-NMR) relaxometry and Fourier transform infrared (FTIR) spectroscopy to detect adulteration of GCO with sunflower oil (SO). Calibration samples containing different proportions of GCO and SO (0-100%) were analyzed using low-field relaxometry, FTIR spectroscopy, and high-resolution 1 1 H TD-NMR H NMR as a reference method. TD-NMR measurements were performed using CPMG pulse sequence, and relaxation parameters were evaluated through inverse Laplace transform (ILT) and three-exponential fitting approaches. Among the relaxation components, T showed the highest sensitivity to compositional changes, presenting a linear correlation with GCO concentration (R 2(3) 2 = 0.9839). FTIR univariate models based on the band at 1670 cm 1 1 vibrational modes, and the band at 3008 cm 1 1 1 , associated with unsaturation-related , attributed to cis = C–H stretching of unsaturated lipid chains, also demonstrated good performance, achieving correlation coefficients of 0.9649 and 0.8866, respectively. Commercial samples analyzed by TD-NMR and FTIR revealed spectral and relaxation profiles inconsistent with authentic GCO in two products, which was further confirmed by high-resolution 1 H NMR through the absence of cafestol and kahweol markers. The results demonstrate that TD-NMR and FTIR provide rapid, simple, and accessible screening approaches for detecting adulteration in green coffee oil, with potential applications in routine quality control and food fraud detection. Thu, 01 Jan 2026 00:00:00 GMT https://www.alice.cnptia.embrapa.br/alice/handle/doc/1188325 2026-01-01T00:00:00Z https://www.alice.cnptia.embrapa.br/alice/handle/doc/1188258 Título: UV-Blocking Active Bioplastics from Coffee Parchment and Pectin. Autoria: SANTOS, L. B.; NARDI, M.; SIMONUTTI, R.; OTONI, C. G.; PEROTTO, G.; ATHANASSIOU, A.; AZEREDO, H. M. C. de Conteúdo: The coffee industry generates large amounts of by-products whose improper disposal may create environmental burdens, while their lignocellulosic matrix and bioactive compounds make them attractive feedstocks for sustainable materials. In this study, coffee husk, parchment, and silverskin were comparatively characterized to identify the most promising fraction for direct conversion into active bioplastics. Based on its composition and film-forming potential, coffee parchment was selected and combined with high-methoxyl pectin to produce films using the biomass in its whole form after mild citric acid pretreatment. The resulting materials were evaluated for mechanical, optical, and functional properties, as well as thermoformability and performance in walnut protection against photooxidative degradation. Depending on formulation, the films showed tensile strength of 3.2–11 MPa, and elongation at break of 30–43%, while all formulations exhibited complete UV-blocking capacity and DPPH radical inhibition of 20–35%. The films could also be thermoformed into three-dimensional structures. In a proof-of-concept application, walnuts packed in the developed films showed markedly lower losses of unsaturated proton signals after UV exposure than walnuts packed in LDPE. These results demonstrate that coffee parchment can act as a main structural component in active bioplastics, supporting whole-biomass valorization for protective packaging applications. Thu, 01 Jan 2026 00:00:00 GMT https://www.alice.cnptia.embrapa.br/alice/handle/doc/1188258 2026-01-01T00:00:00Z