土豆淀粉中颗粒物检测方案

智能文字提取功能测试中

INSITU PAT SENSOR TECHNOLOGYInnovative Particle Measurement Technology REPORT FOR POTATO MEASUREMENTS OF SOLANICVIA IN SITU INLINE APASTM TECHNOLOGY SEQUIP 1. Particle size distribution determination of potato samples via APASTM Sequip In principle， laser beams have various interactions with different types of materials，for instance TiO2 (strong reflection) and black carbon (strong absorption). Figure 1 shows good quality of measurements. The intensity and shape of backreflections strongly indicates spherical shape of potato particles. The secondaryparticles can be formed by aggregation from individual particles. Figure 1： Back reflection spectra of a potato sample. The baseline of signal is quitestable. The shapes of single peaks refer to spherical particles while the multiplepeaks relate to aggregation of bigger clusters due to electrostatic forces. Thus， APASM Sequip is a capable analytical tool for potato particle systems.The following examples will demonstrate measurements of dry potato powders andpotato/water suspensions. INSITU PAT SENSOR TECHNOLOGY Innovative Particle Measurement Technology 2. Dry powder potato samples -Sample name： No xx09 & xx36 Samples are dry potato powders， unknown compositions Measurement conditions： carried out with raw materials from Solanic withoutfurther preparation. Measurements just need very short time， from few seconds to one minute. Measurements just need very small amount of samples. Results of sample No xx09 Figure 2： Measurement results of sample No xx09 via APASTM technique. Remarks： Relatively/good distribution is observed from rawmeasureddata((seehistogram and cumulative windows). That refers to good homogeneity of thispotato sample. -Average diameter d5o(area-weighted) was found about 49 um. INSITU PAT SENSOR TECHNOLOGY Innovative Particle Measurement Technology Results of sample No xx36 Figure 3： Results of sample No xx36 shows bimodal distribution. Remarks： Measurement procedure is remained the same conditions with the sample Noxx09 for comparison purposes. Interestingly， the average diameter d5o(area-weighted)) of this sample isdefined at 42 pm. That is even smaller than the previous case (No xx09).Although by naked eyes， particles of the sample No xx36 can be recognizedobviously bigger than those of the sample No xx09. -An interpretation can be derived from histogram (or cumulative) data that thesample No xx36 shows a bimodal behavior (blackcurves graphicallydemonstrate 2 distributions). In fact， the sample No xx36 contains two particlefractions， tthe average diameters of smaller andd tbigger fractionss aredetermined about 38 um and 110 um (area-weighted)， respectively. Benefits of APASM Sequip： Detecting particle system distribution in very short time period with highaccuracy. Increasing robustness of process control. Help to reduce development-timeand cost of new products. Detectable complex behavior of particle systems such as bimodal or multiplemodal distributions. INSITU PAT SENSOR TECHNOLOGY 3. Suspension potato/water measurements Fine particles in potato juice make difficulty for filtration processes. The task isforming flocculation of potato particles which can assist decanting and phase splittingsteps. In principle， potato juice is a suspension system composing from dispersed phase(potato particles) and continuous phase (water). Stability of this colloidal systemstrongly depends on the zeta potential from the electric double-layer of colloidalpotato particles in water. It is worth to notice that surface charge of potato particles isrelated to protein compositions. The zeta potential can be seen in Figure 4. Figure 4： Colloidal systems and the zeta potential (www.zetawest.com) Stability of the suspension potato/water depends on the zeta potential， i.e. electricdouble-layer. As larger electric double-layer is as more stable the colloid system canremain. Modification surface charge state of potato can influence the stability of this colloidalsystem. In experiment， several chemical compounds were added in to potato juice tonterrupt zeta potential1.The effect of addedl agentsto flocculation sizesissummarized in Table 1. INSITU PAT SENSOR TECHNOLOGY Innovative Particle Measurement Technology Table 1： First measurements of maximum particle sizes of flocculation detected withAPASTM No. Added agents D50， [um] 01 CaCl2.2H2O ~250 02 Polymer ~135 03 MgCl2.2H20 ~31 04 FeCl3 ~ 84， colour!!! 05 Polymer & CaCl2 ~195 06 Epissen ~75 Conclusions： 1. APASTM is a suitable sensor to follow dynamic behavior of potato flocculation.Many useful results can be derived such as stability and particle sizedistribution of flocculation. An advantage of APASTM is aibsl e atble to observeinformation directly from the dispersed phase of solid-particles. 2. Stability of flocculation needs more studies. Other flocculation agents shouldbe tried to stabilize the flocculation in order to improve filterability of potatoiuice.