Innovative storage concepts in private home refrigeration

Transcription

1 Innovative storage concepts in private home refrigeration Cold Chain Management Workshop University of Bonn 3 rd of June 2008 Dr. Astrid Klingshirn Bosch and Siemens Home Appliances Group Product Area Refrigeration

2 home food storage: food handling & storage consumer demands food safety and food loss food preservation in home refrigeration temperature control concepts storage zones vitafresh concept storage atmosphere and hygiene control air filtration ethylene control Cold Chain Management Workshop, I Folie: 2

3 home food storage: consumer demands patterns & trends in food consumption health & wellness convenience & simplicity serving consumption storage preparation purchase transport consumer demands in storage concepts functionality ( smart technologies ) shelf life extension and quality maintenance Cold Chain Management Workshop, I Folie: 3

4 home food storage: food safety & handling deviation in real handling practice and claimed knowledge, especially in shelf life estimation food hygiene food storage temperature regime storage systematics packaging inadequate handling 14,1% environmental factors 12,8% other factors 8,6% raw material 20,5% temperature misuse 44,0% contributing factors in foodborne outbreaks in private homes [WHO, 2002] Cold Chain Management Workshop, I Folie: 4

5 home food storage: storage losses / food discard storage losses major reasons: loss in product quality desiccation texture loss discolorations over ripeness microbial deterioration food category cereal products meat, fish & poultry leftovers milk & milk products fruits & vegetables EU study, 2007 US study, food loss in storage / % leftovers food storage losses in private homes [Thomas, S., PhD Thesis University of Bonn, 2007 van Garde, S.: Food discard practices of householders, 1987] Cold Chain Management Workshop, I Folie: 5

6 refrigerator layout and design temperature humidity gas atmosphere air circulation illumination humidity control ethylene control oxygen control control of dehumidification parameters & storage atmosphere cleaning maintenance of postharvest photosynthetic activity Cold Chain Management Workshop, I Folie: 6

7 temperature control temperature ranges in home refrigeration types of appliances refrigerator - fresh food compartments temperature range 0 to 14 C 0 to 8 C (according to DIN 15502:2005) storage applications - fresh food storage compromising one or more storage compartments - storage of fresh, unfrozen foods - chill compartments - cellar compartments freezer fridge-freezers -2 to +3 C 8 to 14 C -6 to -26 C -18 to +14 C - storage of highly perishable goods - 0 C storage compartments: fruits and vegetables, meat and fish products - storage of semi-perishable goods - frozen food storage and home freezing - combination of fresh food and frozen food storage within one appliance: - fridge freezers (2 temperature zones) - multi zone refrigerators (>2 zones) Cold Chain Management Workshop, I Folie: 7

8 temperature control: technical solutions MultiAirFlow systems temperature controlled drawers chiller compartments chill compartments temperature distribution adjustable settings meat & fish storage C storage Cold Chain Management Workshop, I Folie: 8

9 temperature control: vitafresh concept fresh food compartment 2 C to 8 C chill compartment vitafresh zone, near 0 C temperature control temperature & humidity control freezer -16 to -26 C Cold Chain Management Workshop, I Folie: 9

10 temperature control: vitafresh concept freshness retention in chicken breast vitafresh storage - conventional refrigerator storage log CFU/g microbial analysis (total viable count) storage time / days refrigerator, 5,5ºC vitafresh,0ºc sensory quality index sensory analysis storage time / days refrigerator, 5,5 C vitafresh, 0 C CNTA (Centro National de Technologia y Seguridad Alimentaria) on behalf of BSH, 2007 Cold Chain Management Workshop, I Folie: 10

11 temperature control: vitafresh concept freshness retention in fish fillet vitafresh storage - conventional refrigerator storage microbial analysis (total viable count) sensory analysis refrigerator, 5,5 C log CFU/g refrigerator, 5,5 C sensory quality index vitafresh, 0 C 2 vitafresh, 0 C storage time / days storage time / days CNTA (Centro National de Technologia y Seguridad Alimentaria) on behalf of BSH, 2007 Cold Chain Management Workshop, I Folie: 11

12 temperature control: vitafresh concept humid zone temperature and humidity control weight loss & wilting nutritive value improved resistance to microbial deterioration conventional refrigerator 5 C, 60%rH vitafresh storage 0 C, 90%rH humidity controlled crisper humidity level: ~ 50% rh humidity control layer humidity levels: up to 90% rh excess humidity after 15 days in storage Cold Chain Management Workshop, I Folie: 12

13 storage atmosphere and hygiene control hygiene control overall storage hygiene for stored food products storage atmosphere storage surface areas additional storage support evaluation criteria backup of consumers in storage systematics backup of safe food handling practices limitation in cross-contamination: - microbial contamination - carry-over effects shelf life extension properties Cold Chain Management Workshop, I Folie: 13

14 storage atmosphere and hygiene control active atmosphere control passive atmosphere control system technical realization system technical realization low pressure storage - vacuum box systems - vacuum packaging odour control - activated carbon filter - photocatalytic filter - ionization - ozone generator CA storage - N 2 enrichment ripening gas control - activated carbon - KMnO 4 pellets - PdCl 2 pellets - ionization ClO 2 creation - in place production of chlorine dioxide antimicrobial systems - antimicrobial surface coatings - antimicrobial air filtration Cold Chain Management Workshop, I Folie: 14

15 storage atmosphere cleaning: AirFreshFilter odour reduction by adsorption effects on activated carbon surface reduction of carry- over effects high efficacy by honeycomb structure and catalytic surface treatment placement in refrigerator air duct Cold Chain Management Workshop, I Folie: 15

16 storage atmosphere cleaning: AirFreshFilter activity evaluation gas chromatographic analysis of filter activity by simulation of refrigerator atmosphere with typical odorous compounds gas chromatography - mass spectrometry analysis of real storage atmosphere with / w/o filter material sensory analysis of carry-over effects: triangle test in accordance to DIN ISO 4120 chromatogram of the odorous compounds adsorbed by the filter material in 24h Cold Chain Management Workshop, I Folie: 16

17 storage atmosphere cleaning: ethylene scavengers ethylene gaseous plant hormone that induces senescence and ripening in sensitive produce during storage gas chromatographic analysis of ethylene scavenger activity 1000 blank value scavenger material based on ethylene absorption by KMnO 4 /PdCl 2 /activated carbon activity evaluation evaluation of ethylene oxidation activity by gas chromatographic analysis simulation of vegetable crisper atmosphere for ethylene scavenger activity evaluation ethylene / ppm time / hours PdCl2 pellets KMnO4 pellets KMnO4 and carbon Cold Chain Management Workshop, I Folie: 17

18 storage atmosphere cleaning: ethylene scavengers simulation of a mixed crisper load consisting of ethylene sensitive goods ethylene emitting goods subsequent storage with and w/o ethylene scavengers reduced respiration activity improved colour retention sensory quality index sensory quality in lettuce with and w/o ethylene scavenger material blank value PdCl2 KMnO4 KMnO4 + carbon shelf life extension storage time / days Cold Chain Management Workshop, I Folie: 18

19 conclusion: refrigerator layout and design overall climate control food freshness temperature control humidity control storage atmosphere food safety consumer practice storage systematics storage advice Cold Chain Management Workshop, I Folie: 19

20 for further information: Dr. Astrid Klingshirn BSH Bosch and Siemens Home Appliances Group Product Area Refrigeration PK/EWL Tel.: +49/7322/ Cold Chain Management Workshop, I Folie: 20

21 Cold Chain Management Workshop, I Folie: 21

22 temperature control: vitafresh concept integration of temperature controlled drawers in cooling appliances active temperature control exact temperature control by separate temperature sensor and magnetic valve passive humidity control use of moisture released by product transpiration separate storage compartments for perishable goods with defined storage systematics: dairy products & eggs meat & fish fruits & vegetables Cold Chain Management Workshop, I Folie: 22