Active antifungal packaging is a technological solution for reducing the postharvest losses of fruits and vegetables associated with phytopathogens. Anthracnose (Colletotrichum gloeosporioides) is the principal fungus that causes post-harvest avocado fruit decay. In this study, antifungal sachets filled with oregano oil-starch capsules were prepared, and their active effects were demonstrated on Hass avocado fruits. Oregano oil (31 % of carvacrol) was encapsulated with corn starch by spray drying. Tyvek sachets (4 × 4 cm) filled with 80 (T1) and 160 mg (T2) of oregano oil-starch capsules (99.35 ± 1.86 mg g − 1) were fabricated. The antifungal effects of the sachets were tested in vitro and in vivo using a humidity chamber (90–95 % relative humidity (RH)) on fruits inoculated with anthracnose. The results showed that T1 and T2 inhibited 75.21 ± 2.81 and 100 % in vitro growth of anthracnose at 25 °C for 12 days. Furthermore, Hass avocado fruits stored in a humidity chamber at 25 °C for 6 days showed that only T2 significantly (p < 0.05) reduced the area of lesion produced by artificial inoculation of Hass avocado fruits with anthracnose. On average, the lesion area in the Hass avocado fruits treated with T2 was 13.94 % smaller than that in the control fruit.
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In deze factsheet lees je meer over de verschillende soorten fruit, voedingsstoffen in fruit en gerelateerde gezondheids-, voedselveiligheids-, gedrags- en duurzaamheidsaspecten. Lector Herman Peppelenbos, van het lectoraat Groene Gezondheid, is bij het opstellen van deze factsheet geconsulteerd als expert.
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Fruit en landschap, dan denk je misschien aan de Betuwe, waar fruitteeltbedrijven zich aaneenrijgen. Van oudsher was het rivierenlandschap rijk aan fruit en noten, en dan vooral op de hogere gronden, dichtbij de dijk, zodat menig boerderij en dijkhuis weelderig door fruit- en notenbomen omringd was. Naast de commerciële fruitteelt en de fruitbomen op privégrond zijn vruchtbomen ook vaak te vinden in de openbare ruimte van steden en dorpen. Gemeentes planten fruit aan, of nemen oude fruitbomen op in het openbaar groen. En tenslotte zien we allerlei groepen, clubs, verenigingen die initiatief nemen om fruit aan te planten, openbaar of niet openbaar. In sommige gemeentes, zoals bijvoorbeeld Culemborg, vind je dat allemaal naast elkaar. De professionele fruitteler laten we hier verder buiten beschouwing, maar voor alle andere vormen van vruchtbomen geldt eigenlijk dat de bomen, de eigenaren, de beheerders en de gebruikers wel gebaat zijn bij een steuntje in de rug vanuit de betrokken gemeente, of het nu gaat om dat wat er is in stand te houden, of nieuw fruit aan te planten. Ook een kritische blik op het eigen gemeentelijke vruchtbomenbeleid hoort daarbij. Daar wil deze handreiking aan bijdragen.
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Een mismatch tussen vraag en aanbod is in de gehele groente- en fruitsector aan de orde. Overaanbod zorgt mede voor voedselverspilling. Robert van Meer wilt het mogelijk maken om realistische oogstprognoses te maken door te telen in een klimaatkamer en op vraag te telen. Aardbeien kunnen overal ter wereld geteeld gaan worden in dit systeem zonder gebruik van gewasbeschermingsmiddelen.
Deploying robots from indoor to outdoor environments (vise versa) with stable and accurate localization is very important for companies to secure the utilization in industrial applications such as delivering harvested fruits from plantations, deploying/docking, navigating under solar panels, passing through tunnels/underpasses and parking in garages. This is because of the sudden changes in operational conditions such as receiving high/low-quality satellite signals, changing field of view, dealing with lighting conditions and addressing different velocities. We observed these limitations especially in indoor-outdoor transitions after conducting different projects with companies and obtaining inaccurate localization using individual Robotics Operating Systems (ROS2) modules. As there are rare commercial solutions for IO-transitions, AlFusIOn is a ROS2-based framework aims to fuse different sensing and data-interpretation techniques (LiDAR, Camera, IMU, GNSS-RTK, Wheel Odometry, Visual Odometry) to guarantee the redundancy and accuracy of the localization system. Moreover, maps will be integrated to robustify the performance and ensure safety by providing geometrical information about the transitioning structures. Furthermore, deep learning will be utilized to understand the operational conditions by labeling indoor and outdoor areas. This information will be encoded in maps to provide robots with expected operational conditions in advance and beyond the current sensing state. Accordingly, this self-awareness capability will be incorporated into the fusion process to control and switch between the localization techniques to achieve accurate and smooth IO-transitions, e.g., GNSS-RTK will be deactivated during the transition. As an urgent and unique demand to have an accurate and continuous IO-transition towards fully autonomous navigation/transportation, Saxion University and the proposal’s partners are determined to design a commercial and modular industrial-based localization system with robust performance, self-awareness about the localization capabilities and less human interference. Furthermore, AlFusIOn will intensively collaborate with MAPS (a RAAKPRO proposed by HAN University) to achieve accurate localization in outdoor environments.
Chemical preservation is an important process that prevents foods, personal care products, woods and household products, such as paints and coatings, from undesirable change or decomposition by microbial growth. To date, many different chemical preservatives are commercially available, but they are also associated with health threats and severe negative environmental impact. The demand for novel, safe, and green chemical preservatives is growing, and this process is further accelerated by the European Green Deal. It is expected that by the year of 2050 (or even as soon as 2035), all preservatives that do not meet the ‘safe-by-design’ and ‘biodegradability’ criteria are banned from production and use. To meet these European goals, there is a large need for the development of green, circular, and bio-degradable antimicrobial compounds that can serve as alternatives for the currently available biocidals/ preservatives. Anthocyanins, derived from fruits and flowers, meet these sustainability goals. Furthermore, preliminary research at the Hanze University of Applied Science has confirmed the antimicrobial efficacy of rose and tulip anthocyanin extracts against an array of microbial species. Therefore, these molecules have the potential to serve as novel, sustainable chemical preservatives. In the current project we develop a strategy consisting of fractionation and state-of-the-art characterization methods of individual anthocyanins and subsequent in vitro screening to identify anthocyanin-molecules with potent antimicrobial efficacy for application in paints, coatings and other products. To our knowledge this is the first attempt that combines in-depth chemical characterization of individual anthocyanins in relation to their antimicrobial efficacy. Once developed, this strategy will allow us to single out anthocyanin molecules with antimicrobial properties and give us insight in structure-activity relations of individual anthocyanins. Our approach is the first step towards the development of anthocyanin molecules as novel, circular and biodegradable non-toxic plant-based preservatives.
Lectoraat, onderdeel van HAS green academy
