In this activity, the water molecules are attracted to each other and stick together. An atom is the smallest piece of a chemical element that is still that element. A molecule is two or more atoms bonded together. What happens this time?īefore we begin, let's define molecule. Add a small drop of dish soap on the tip of your finger and repeat step 3.Watch what happens, then remove your finger. Carfully stick your finger straight down through the dome of the water in the full glass.Slowly, pour some water from the second glass into the first glass until it is very full and the water forms a dome above the rim of the first glass.Place the first glass of water in the center of the pie plate.The novel rice product made from broken rice by extrusion processing and addition of the purple sweet potato exhibited improved structural properties and reduced digestibility, which increased the potential value and application of broken rice in the food industry. In addition, a significantly lower equilibrium hydrolysis ( C ∞) and kinetic constant ( k) were observed in ERPSP. The results of XRD and FT-IR spectroscopy showed that the semicrystalline structure of extruded rice changed from A-type to A + V-type mixture, and the relative crystallinity of extruded rice changed accordingly. In particular, compared with raw rice, the WAI and WSI of ERPSP was higher, and the thermal properties also changed noticeably. SEM results showed that there were numerous pits and bubbles in the extruded rice. Moreover, the effects of extrusion and added purple sweet potato on the structure and in vitro digestibility of extruded rice were studied via numerous detection methods, such as scanning electron microscopy (SEM), water absorption index (WAI), water solubility index (WSI), differential scanning calorimetry (DSC), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FT-IR). In this study, extruded rice with purple sweet potato (ERPSP) was prepared. Recently, extruded rice as a functional ingredient has been a hot area of research in food processing.
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