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SMALL GRANULE POTATO STARCH. STRUCTURE AND USABILITY 89

Smali granule and standard starch samples revealed the same B type of X-ray dif-fraction pattem typical of potato starch (Fig. 3), but a significant difference in their relative crystallinity seemed to be the most important observation. Smali granule potato starch exhibited rather Iow degree of crystallinity what may be associated with a maturity of starch granules. According to Gambuś et al [7] the smali starch grains are synthesised in cereal kemel mainly during late-waxy phase. Short time of growing of smali granules could be the reason of their chaotic organisation and conseąuently smaller crystallinity. In spite of that SEM analysis did not pointed to any damages of the granules surface (Fig. 4).

The Chemical analysis of standard and smali granule potato starch (Table 1) proved that purification processes performed in WPPZ Luboń were satisfactory. Ash

1090.0

Fig. 3. X-ray diffraction pattems of potato starch: a - standard; b - smali granule.

Fig. 4. SEM microphotographs of potato starch: a - standard; b - smali granule.

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