The study aimed to research and obtain the optimal formulation, process and mechanism of the preparation of celery fiber hollow capsules. With celery fiber and starch as raw materials and mechanical properties as indexes, the optimum capsule samples were obtained by orthogonal experiments under specific process. And the capsule was characterized by UV-Vis-NIR spectrophotometer, scanning electronic microscopy (SEM), X-ray diffraction (XRD), fourier transform INFRARED (FTIR), and thermogravimetric analysis-differential scanning calorimetry (TG-DSC). The results showed that the optimal conditions were beating degree of 35 °SR, the water loss rate of 82%, celery fiber content of 3.5 g/L and starch content of 18 g/L. The tensile strength of capsules could reach 13.56 MPa and elongation at break could reach 25.35 %. In addition, the transmittance test showed a good compatibility of starch, carrageenan, konjac flour and glycerol. SEM showed the compatibility weakened the phase separation caused by celery fiber, and the mechanical properties of capsules were enhanced by fiber winding. Moreover, XRD showed the mixture system formed a wide diffraction peak at about 20 degrees and formed an amorphous structure. FTIR showed that the absorption peak near 3 300cm-1 decreased and the mixes system tended to be homogeneous and stable. The capsule had good thermal stability below 110 °C. Celery fiber can be used to prepare plant hollow capsules, which can significantly reduce the cost of existing plant capsules and has good economic value.
YANG Lijun
,
SHENG Wenpan
,
TANG Peng
. Process optimization and mechanical properties analysis of celery fiber hollow capsules[J]. Food and Fermentation Industries, 2019
, 45(20)
: 124
-131
.
DOI: 10.13995/j.cnki.11-1802/ts.021110
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