Review Fruits, vol. 61 (4) 237 Pitahaya (Hylocereus spp.): a new fruit crop, a market with a future.Abstract --Introduction. Still practically unknown in the mid-1990s in Europe, pitahaya (Hylocereus spp.) is now a full member of the 'small exotic fruits' category in shops. Nevertheless, these species are not very well known. The aims of our work were first to evaluate thoroughly the literature currently available on Hylocereus and secondly to supplement this review by agronomic works not yet published. Knowledge of Hylocereus. The study includes a presentation of the origin, botany, morphology and floral biology of the principal species cultivated within the Hylocereus genus and suggests a key for determination. Cultivation techniques. The agronomical practices used in Hylocereus orchards are broached: multiplication, cultivation practices (supports, density, pruning, mineral nutrition, irrigation, etc.), pollination and harvest. Pests and diseases are cited too. Physico-chemical composition of fruits. This work draws up a review of different studies regarding pitahaya composition, micronutrients and pigments. Post-harvest and processing. The life of the fruit after harvest (conservation and storage life) is approached as well as the various possibilities of processing. European market. The European market is analyzed for the various cultivated species of Hylocereus (imported quantity, market segment, origin of production, etc.) and its evolution prospects are evoked. Conclusion. Our review highlights the fact that the interest shown in these pitahayas is recent and, for these reasons, more detailed knowledge on these species is required (agronomic, genetic and technological). tropical zones / subtropical zones / Hylocereus / botany / agronomy / chemical composition / storage / postharvest technology / European union / markets Les pitahayas (Hylocereus spp.) : nouveaux fruits, marché en devenir. Résumé --Introduction. Encore pratiquement inconnues dans le milieu des années 1990, les pitahayas (Hylocereus spp.) font désormais partie intégrante du marché européen au linéaire « petits fruits exotiques ». Pourtant, ces différentes espèces semblent mal connues. Les objectifs de notre travail ont été à la fois de faire un point approfondi de la bibliographie disponible et de compléter cette synthèse par des travaux agronomiques non publiés. Connaissance des Hylocereus. L'étude comprend une présentation de l'origine, la botanique, la morphologie et la biologie florale des principales espèces cultivées au sein du genre Hylocereus et propose une clé de détermination. Techniques culturales. Les différentes pratiques culturales connues sont abordées : techniques de multiplication, conduite agronomique (palissage, taille, fertilisation, irrigation, etc.), pollinisation, récolte, etc. Les principaux ravageurs et maladies sont également cités. Composition physico-chimique des fruits. Ce travail fait une synthèse des différentes études effectuées sur la pitahaya : composition physico-chimique, micronutriments et colorants. ...

Anthocyanin stability was assessed over temperatures ranging from 30 to 90 degrees C for seven products: blood orange juice [Citrus sinensis (L.) Osbeck]; two tropical highland blackberry juices (Rubus adenotrichus Schlech.), one with high content and the other with low content of suspended insoluble solids (SIS); and four roselle extracts (Hibiscus sabdariffa L.). The blackberry juice showed the highest content of anthocyanins with 1.2 g/L (two times less in the roselle extracts and 12 times less in the blood orange juice). The rate constant for anthocyanin degradation and isothermal kinetic parameters were calculated according to three models: Arrhenius, Eyring, and Ball. Anthocyanins in blood orange juice presented the highest rate constant for degradation, followed by the blackberry juices and roselle extracts. Values of activation energies were 66 and 37 kJ/mol, respectively, for blood orange and blackberry and 47-61 kJ/mol for roselle extracts. For the blackberry juices, a high SIS content provided only slight protection for the anthocyanins. The increasing content of dissolved oxygen, from 0.5 to 8.5 g/L, did not significantly increase the rate constant. For both isothermal and nonisothermal treatments, all three models accurately predicted anthocyanin losses from different food matrices.

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