A rapid predictive method based on near-infrared re flectance spectroscopy(NIRS)of paddy rice was developed to measure the pasting properties of rice.The paddy rice samples were scanned by a near-infrared re flectance...A rapid predictive method based on near-infrared re flectance spectroscopy(NIRS)of paddy rice was developed to measure the pasting properties of rice.The paddy rice samples were scanned by a near-infrared re flectance spectrometer in the wavelength region of 1400–2400 nm and preprocessed by mathematical pretreatments prior to pasting properties analysis using a rapid visco-analyzer(RVA).The results indicated that the developed models of setback(SB),peak viscosity(PV),breakdown(BD)and consistency(CS)provided good prediction results with relatively high correlation coe±cients(0.81–0.96).In addition,the validity of the calibration models was statistically tested.Standard error of prediction(SEPT) and bias were small enough without any significance at 95% confidence interval.Nonetheless,this study proved that the use of NIRS for predicting pasting properties was feasible in paddy rice and could be applied in commercial trade and research.展开更多
Edible coatings,as carriers of antimicrobial compounds,have been proposed as an alternative method to preserve fresh-cut products.This research focused to improve the shelf life of fresh-cut rose apples by applying an...Edible coatings,as carriers of antimicrobial compounds,have been proposed as an alternative method to preserve fresh-cut products.This research focused to improve the shelf life of fresh-cut rose apples by applying an edible coating based on alginate cross-linked with calcium chloride(SAC)-enriched hexyl acetate(HA)as a natural antimicrobial compound.The SAC with HA in 0.01,0.03,and 0.05%(v/v)(SAC-HA)solution was evaluated for its film properties and applied to fresh-cut rose apples,and compared with the unmodified SAC coating.Postharvest quality and microbial contamination were determined every 2 days during 10 days of storage at 4℃.The film thickness,tensile strength,and elongation at break increased with the high concentrations of HA added.Films containing 0.03%HA had lower oxygen permeability(from 1.57 to 0.04×10^(-7) cm^(3)μm m^(-2) day^(-1) kPa^(-1)),as well as water vapor permeability(from 0.03 to 0.01 g mm m^(-2) day^(-1) kPa^(-1)),compared to the unmodified SAC film.Moreover,the greater coating uniformity and thickness were supported by scanning electron microscopy and Fourier transform infrared spectroscopy.The developed edible SAC coatings with 0.03%HA successfully preserved the physicochemical quality and extended the shelf life of fresh-cut rose apples for 10 days at 4℃ by retarding the respiration rate,inhibiting browning,and preventing microbial growth.Therefore,the using of SAC-HA in fresh-cut products is a promising and safe preservation technique to extend shelf life.展开更多
文摘A rapid predictive method based on near-infrared re flectance spectroscopy(NIRS)of paddy rice was developed to measure the pasting properties of rice.The paddy rice samples were scanned by a near-infrared re flectance spectrometer in the wavelength region of 1400–2400 nm and preprocessed by mathematical pretreatments prior to pasting properties analysis using a rapid visco-analyzer(RVA).The results indicated that the developed models of setback(SB),peak viscosity(PV),breakdown(BD)and consistency(CS)provided good prediction results with relatively high correlation coe±cients(0.81–0.96).In addition,the validity of the calibration models was statistically tested.Standard error of prediction(SEPT) and bias were small enough without any significance at 95% confidence interval.Nonetheless,this study proved that the use of NIRS for predicting pasting properties was feasible in paddy rice and could be applied in commercial trade and research.
文摘Edible coatings,as carriers of antimicrobial compounds,have been proposed as an alternative method to preserve fresh-cut products.This research focused to improve the shelf life of fresh-cut rose apples by applying an edible coating based on alginate cross-linked with calcium chloride(SAC)-enriched hexyl acetate(HA)as a natural antimicrobial compound.The SAC with HA in 0.01,0.03,and 0.05%(v/v)(SAC-HA)solution was evaluated for its film properties and applied to fresh-cut rose apples,and compared with the unmodified SAC coating.Postharvest quality and microbial contamination were determined every 2 days during 10 days of storage at 4℃.The film thickness,tensile strength,and elongation at break increased with the high concentrations of HA added.Films containing 0.03%HA had lower oxygen permeability(from 1.57 to 0.04×10^(-7) cm^(3)μm m^(-2) day^(-1) kPa^(-1)),as well as water vapor permeability(from 0.03 to 0.01 g mm m^(-2) day^(-1) kPa^(-1)),compared to the unmodified SAC film.Moreover,the greater coating uniformity and thickness were supported by scanning electron microscopy and Fourier transform infrared spectroscopy.The developed edible SAC coatings with 0.03%HA successfully preserved the physicochemical quality and extended the shelf life of fresh-cut rose apples for 10 days at 4℃ by retarding the respiration rate,inhibiting browning,and preventing microbial growth.Therefore,the using of SAC-HA in fresh-cut products is a promising and safe preservation technique to extend shelf life.
