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Suparat Sirisakulwat Pittaya Sruamsiri Reinhold Carle Sybille Neidhart 《International Journal of Food Science & Technology》2010,45(8):1647-1658
Susceptibility of industrial mango peel waste to pectin degradation during storage at ambient conditions (25 °C, 63% relative humidity) for up to 5 h before by‐product stabilisation by drying was explored. Depending on the interim storage period in the wet state, pectins were recovered from the dried peels by hot‐acid extraction. Most important, pectin degradation during the temporary storage of the wet peels was insignificant, as revealed by yields, composition, average molecular properties, and techno‐functional quality. Hardly acetylated (DAc 2.5–4.5%), rapid‐set high‐methoxyl pectins were obtained at starch‐corrected net yields of 14.1–15.6 g hg?1. Irrelevant de‐esterification during peel storage in the wet state was confirmed by overall uniform setting temperatures. Arabinogalactans, uniformly indicated by high molar galactose/rhamnose ratios of 13.8–16.9 mol/mol and an arabinose percentage of 9.5–14.4 mol hmol?1 of galactose residues, affected the galacturonide contents, intrinsic viscosities, and gel strengths throughout. The wet peels, derived from widespread manual peeling in mango canning, tolerated intermediate storage for 5 h, thus facilitating by‐product stabilisation on smaller scales. 相似文献
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P. Monprasit C. Ritvirulh T. Sooknoi S. Rukchonlatee A. Fuongfuchat D. Sirikittikul 《Polymer Engineering and Science》2011,51(7):1264-1272
The composite double‐layered films, for the packaging application of postharvest fruits and vegetables, were prepared by laminating low‐density polyethylene (LDPE) and poly[styrene‐b‐(ethylene‐co‐butylene)‐b‐styrene] (SEBS) modified with zeolite ZSM‐5. The film was characterized by scanning electron microscope and differential scanning calorimeter and tested for permeation of ethylene (C2H4), oxygen (O2), carbon dioxide (CO2), and water vapor. It was found that the C2H4 permeability of the films was improved because of an enhanced adsorption of C2H4 by the incorporated zeolite (0–10 wt%). The preconcentrated layer (zeolite/SEBS) leads to a higher C2H4 concentration gradient across the film. Moreover, the high dispersion of zeolite increased the C2H4 permeation. When compared with O2 and CO2, the composite films were more selective to C2H4. However, the C2H4 permeation decreased in the presence of O2 because of a competitive adsorption. In addition, the films possessed appreciate tensile properties for packaging application. POLYM. ENG. SCI., 2011. © 2011 Society of Plastics Engineers 相似文献
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Prachya Watasit Suparat Rukchonlatee Artit Ausavasukhi Chonlada Ritvirulh Tawan Sooknoi 《应用聚合物科学杂志》2021,138(42):51229
The CO2 and CH4 permeabilities of poly(ethylene-co-vinyl acetate) (EVA)/SiO2 composite membrane were investigated at atmospheric pressure. The membranes were fabricated by compression molding and characterized by Fourier transformed infrared spectroscopy, differential scanning calorimetry, a universal testing machine, and a contact angle analyzer. The effect of vinyl acetate content (18–33 wt%) was evaluated for both single-gas and mixed-gas permeation systems. A non-pressurized homemade-permeation cell was used for the single-gas permeation of CO2 and CH4, while a tubular membrane was utilized for a continuous separation of CO2/CH4 mixture. CO2 flux was readily increased (from 0.7 to 2.0 ml/m2.s) with vinyl acetate content (18–33 wt%). The enhanced CO2 permeability is attributed to the increase in polarity and also the decrease in crystallinity of the membrane. A satisfied gas separation selectivity (CO2/CH4) of 4.31 could be obtained from tubular membrane with 28 wt% VA content. The incorporation of SiO2 as a filler (0.5–2.0 wt%) especially increased the membrane polarity and hence the CO2 flux up to 6.0 ml/m2.s. However, the CH4 flux was not affected by VA and SiO2 contents. 相似文献
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