Tissue permeance of prickly pear cactus stems (Opuntia spp.) to CO2, O2 and H2O vapor as a function of temperature and relative humidity
Juan Carlos Guevara-Arauza and Elhadi M. Yania
9th Controlled Atmosphere Research Conference (CA2005). Program and Abstract.Michigan State University, East Lansing, Michigan, USA. July 5-10, 2005. page50
2005
บทคัดย่อ
Tissue permeance of prickly pear cactus stems (Opuntia spp.) to CO2, O2 and H2O vapor as a function of temperature and relative humidity
The characterization of the internal atmosphere composition offers the potential to explain in response of horticultural products to modified atmosphere treatments and quantify permeance of skin to respiratory gases.Stem skin permeance to O2 (b02) and CO2 (bC02) were determined as a function of temperature and relative humidity.Surface chamber close to equilibrium with the stem’s internal atmosphere was used to monitor internal atmosphere composition of prickly per cactus stems.Physical equilibration of chamber contents over fruit surface was completed in approximately 4 hours.However, physiological changes in the composition of internal atmosphere meant that substantial changes continued to develop for a prolonged period of time. b02 decreased in greater proportion than bC02 at high relative humidity, and as a result an inversly proprtional between permeance to gases and the relative humidity was determined. bH20 also decreased as relative humidity increased.The Arrhenius model describedhumidity on skin permeance bx=(AHRB + C).l.Surface chamber adhered to stem surface was adequate to quantify the composition of the atmosphere in direct contact with the stem cells.