NU FS363 Lecture Notes - Lecture 3: Modified Atmosphere, Food Microbiology, Psychrophile

• School: University of Alberta
• Department: Nutrition and Food Sciences
• Course: NU FS363
• Professor: Lynn Mc Mullen

Document Summary

2 p(cid:396)o(cid:271)le(cid:373)s (cid:449)ith the sa(cid:373)e (cid:862)spoilage(cid:863) issue (cid:271)ut e(cid:374)ti(cid:396)ely diffe(cid:396)e(cid:374)t (cid:272)auses. Unacceptable -> a vacuum packaged product (so no gas is packaged but there is gas production) The box will break, the seller and the buyer will be unhappy. Growth of the bacteria and its metabolism (what kind of composition, what is breaking down?) Impact on food quality (nothing to do with safety, has to do with the spoilage) Lo(cid:272)al (cid:272)o(cid:373)pa(cid:374)y (cid:396)epo(cid:396)ts (cid:862)(cid:271)lo(cid:449)i(cid:374)g(cid:863) of (cid:448)a(cid:272)uu(cid:373) pa(cid:272)kaged (cid:271)eef that has (cid:271)ee(cid:374) kept at (cid:396)ef(cid:396)ige(cid:396)ato(cid:396) temperatures (no temperature abuse) Most o(cid:396)ga(cid:374)is(cid:373)s fou(cid:374)d o(cid:374) f(cid:396)esh (cid:373)eat do (cid:374)ot p(cid:396)odu(cid:272)e suffi(cid:272)ie(cid:374)t (cid:395)ua(cid:374)tities of gas to (cid:272)ause (cid:862)(cid:271)lo(cid:449)(cid:374) pa(cid:272)k spoilage(cid:863) This ki(cid:374)d of i(cid:374)(cid:272)ide(cid:374)t happe(cid:374)s spo(cid:396)adi(cid:272)ally, (cid:449)e k(cid:374)o(cid:449) the (cid:373)i(cid:272)(cid:396)oo(cid:396)ga(cid:374)is(cid:373) (cid:271)ut (cid:449)e do(cid:374)"t k(cid:374)o(cid:449) (cid:449)hy it keeps coming back. Strict anaerobe (put in anaerobic hood at 7 degrees celsius) Psychrophile optimum growth temperature < 20 degrees celsius (low optimum growth temperature). Does(cid:374)"t g(cid:396)o(cid:449) (cid:449)ell i(cid:374) the p(cid:396)ese(cid:374)(cid:272)e of othe(cid:396) o(cid:396)ga(cid:374)is(cid:373)s.