Some researchers have developed first-order kinetic models for degradation of vitamin C in juice during storage [2]. However, there is little information available in the literature about the kinetics of vitamin C content in fresh jujube during storage.Near-infrared (NIR) spectroscopy has recently attracted a great http://www.selleckchem.com/products/brefeldin-a.html deal of attention as a non-destructive method for Inhibitors,Modulators,Libraries detecting the internal quality of fruits. A vast amount of research has been conducted using NIR spectroscopy to detect the quality of fruits, such as taste characterization in Valencia oranges [6]; soluble solids content (SSC) and firmness in apples [7]; acidity, soluble solids and firmness in Satsuma mandarin [8]; and vitamin C in Navel orange [9]. Van et al.

[10] applied kinetic and near-infrared models to describe firmness and moisture loss with time change at constant external condition, respectively.The objectives of this study were: (1) to optimize the NIR spectroscopy model of the vitamin C content of fresh jujube to predict the vitamin C content changes during storage Inhibitors,Modulators,Libraries at room temperature; (2) to build a kinetic model of vitamin C content according to NIR spectroscopy and storage time at room temperature; and (3) to predict the shelf life of fresh jujube at room temperature.2.?Material and Methods2.1. Sample PreparationSeventy-two intact ��Lizao�� jujube fruits weighing 25�C30 g were hand-harvested from an orchard in Dali, Shaanxi Province, China in the year 2012. The 72 samples were labeled, randomly divided into 18 groups and put on the tray, then stored at room temperature (20 ��C).

Inhibitors,Modulators,Libraries The weight of each sample was measured and recorded before spectroscopic measurements. One group of samples was selected every day for the experiment. In other words, the experiment lasted for 18 days since the experiential decay period at room temperature is 15 days).2.2. Spectral MeasurementsSpectra were measured by using a Fourier transform near-infrared spectrometer (BRUKER MPA, Ettlingen, Germany) equipped with the OPUS 6.5 optical software. The spectrometer was allowed to warm up for about 30 min, and all spectra were obtained using a fiber optic probe with a wavenumber range of 12,000�C4,000 cm?1 at 8 cm?1 intervals and a scan number of 64. A spectral white panel was used as reference to eliminate interference by the light source itself. The samples were divided to 18 groups.

Every group had four samples. At the first day, the spectra of 72 samples were obtained, and the four samples of group one were adopted to measure the vitamin C content. At the Inhibitors,Modulators,Libraries second day, the spectra of the remaining 68 samples were obtained, and the four samples of group two were adopted Dacomitinib to measure the vitamin C content. At the 18th day, only four samples selleck chemicals llc were left. The spectra of the remaining four samples were obtained to measure the vitamin C content. Therefore, the samples of group one have one spectrum, the samples of group two have two spectra, the samples of group three have three spectra, etc.