3 years ago

Non-invasive determination of the quality of pomegranate fruit

In the apparent absence of non-invasive studies of the glossiness and roughness of pomegranate fruit (cv. ‘Hicaz’) during storage, we investigated changes in their surface micro-structure using two new non-destructive technologies: a profilometer providing 3D digital photography and surface roughness as visual and parametric roughness (Ra; Rz) as well as glossiness by non-invasive luster sensor technology. The 3D intact sections of the pomegranate showed a shimmering surface with fresh fruit, but a rough structure in the RGB images after three weeks storage, associated with a wider range of values, i.e. higher peaks and lower troughs over time, which was visualised in the images. The roughness coefficients Ra and Rz, provided by the 3D-profilometer, confirmed the colour-coded visualization in the false images and increased with storage time: The roughness values (Ra) were 11μm for the fresh pomegranate fruit with a smooth peel; 24μm with aged pomegranate and 43μm with the old shriveled fruit. The Rz values were 69μm for the fresh pomegranate fruit with the smooth surface, 148μm at the intermediate pomegranate and 255μm for old fruit. During the three weeks storage, the luster values of red or yellow, non-russet peel sections decreased more rapidly from 90 to 50 arbitrary units (a.u.) than those of the russet peel; the latter areas with a rough appearance showed significantly lower luster values of ca. 40a.u. compared with the russet-devoid areas. Luster and roughness values were always inversely correlated and confirmed their visual appearance. The lack of significant differences between the luster values of the red and yellow peel portions supports our hypothesis that colour plays an insignificant role in this luster/gloss detection, and proves the suitability of this innovative real-time, contactless and cost-effective sensor technology as a novel evaluation used in post-harvest technology.

Publisher URL: www.sciencedirect.com/science

DOI: S0925521417307548

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.