Hop pellets type 90: ESEM studies of glandular trichomes morphological and structural changes during the different phases of hop processing

Srečec, S. and Zechner-Krpan, V. and Marag, S. and Mršić, G. and Špoljarić, I. (2011) Hop pellets type 90: ESEM studies of glandular trichomes morphological and structural changes during the different phases of hop processing. Acta Alimentaria, 40 (2). pp. 282-290. ISSN 0139-3006

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Abstract

The results of this study show that the most usual damages of hop glandular trichomes are obtained on tunica of peltate glandular trichomes as well as cracking of bulbous glandular trichomes. In fresh hop cones any sorts of damage of glandular trichomes are obtained, on the other hand frequency of damaged hop glandular trichomes increase after drying (fi=0.08) and after pelletization of hop cones the structure of glandular trichomes is completely destroyed. Volume of hop glandular trichomes of dried hop cones is significantly smaller in the comparison with volume of glandular trichomes of fresh hop cones (D=0.544×10−2 mm3; P<0.01) and a phenomenon of shrinkage on tunica surface of peltate glandular trichomes of dried hop cones is also visible in comparison with the fresh one. The decrease in volume of hop glandular trichomes in dried hop cones is the result of dehydration of hop cones and consequently hops glandular trichomes during the drying process which cause shrinkage of peltate glandular trichomes. However, after pelletization the structure of hop glandular trichomes is completely destroyed.

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