Abstract

LICETA LLANCO, Arturo; CANCINO CHAVEZ, Keidy; NOLAZCO CAMA, Diana  and  GUEVARA PEREZ, Américo. Effect of packaging, modified atmosphere and storage temperature in the preservation of roasted humitas. Scientia Agropecuaria [online]. 2018, vol.9, n.2, pp.239-246. ISSN 2077-9917.  http://dx.doi.org/10.17268/sci.agropecu.2018.02.09.

Roasted humitas were subjected to packaging (transparent PET/LDPE and metallized PET/BOPPM/CPE), modification of atmosphere (vacuum and nitrogen gas) and storage temperature (3 and -18 ºC), performing analysis of: water activity, humidity, color, acidity, texture, gas in the h ead space, mesophilic aerobic count, total coliforms, molds and yeasts; during 90 days of storage, to determine its conservation. The packages showed a low permeability to N2. The color differences (ΔE*) in the treatments were less than 10, reporting ΔE* average 6.63 and 7.39; in transparent and metallic packaging, respectively. The frozen samples consigned 45% of humidity and 0.966 of a w, superior to those conserved in refrigeration and at the initial value. The acidity increased, from 0.20 to 0.28 and 0.25%, for refrigerated and frozen humitas, respectively. The very low microbiological counts indicated stability of the product. The textural characteristics that defined the roasted humita were: hardness, humidity, adhesiveness, fatty character, granularity and chewiness, these last two being significantly greater (α = 0.05) than the newly elaborated samples, for all the treatments. The combination of metallized packaging, vacuum, and storage in freezing; managed to preserve most of the evaluated characteristics of the roasted humita.

Keywords : roasted humita; preservation; packaging; modified atmosphere.

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