Instructional Plan in Technology Technology and Livelihood Education Grade 8 Commercial Cooking Quarter : Third Date : Novemer !"# $%!& 'Thursday( 'Thursday( Time : ):%% * ):&% G8 * I '+methyst( * . 'Emerald( 8:-% * ":$% G8 * / 'Pearl( 'Garnet( ":&% * !%:,% G8 * + 'Diamond(
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I1 Learning 23ectives: At the end of the period, the students should be able to:
1. dene chemical 2. enumerate the chemicals that can be used in sanitizing 3. discuss the advantages and disadvantages of dierent chemical sanitizers II1 4u3ect 5atter: Content Area: Commercial Cooing !opic !opic : Chemical "anitizers "anitizers "ource : #earning $odule of Commercial Cooing %!.#.&.' %!.#.&.' $aterials : video III1 Learning Tasks +1 +ctivity ( )ail* +outine ( "et nduction
!he teacher -ill -ill sho- alcohol alcohol and sanitizer sanitizer #et the the learners learners eamine it. .1 +nalysis
( As the students to describe both of them. ( #et the students identif* each. ( /ave *ou ever used these0 hen0 ( #ead the learners to start -ith prior no-ledge: hat do *ou thin are the purpose of the t-o04 C1 +straction
C.1. 5ive meaning of chemical. Chemical is a substance obtained b* a chemical process or producing a chemical eect.
C.2. 6ame the chemicals that can be used in sanitizing. Chemicals that are approved sanitizers are: Chlorine 6 78 ppm in -ater 97 and 188; Iodine 6 12.7(27 ppm in -ater that is at least 97; 7uaternary ammonium ( < to 288 ppm in -ater that is at least 97;
)ierent factors in=uence the eectiveness of chemical sanitizers. !he three factors that must be considered are: •
•
•
Concentration (( !he presence of too little sanitizer -ill result in an inade>uate reduction of harmful microorganisms. !oo much can be toic. !emperature (( 5enerall* chemical sanitizers -or best in -ater that is bet-een 77o;%13oC' and 128o; %?@oC'. Contact time (( n order for the sanitizer to ill harmful microorganisms, the cleaned item must be in contact -ith the sanitizer %either heat or approved chemical' for the recommended length of time.
ther Chemicals sanitizers are: +cid6+nionic 4anitiers
#ie BACs, acid(anionic sanitizers are surface(active sanitizers. !hese formulations include an inorganic acid plus a surfactant and are often used for the dual function of acid rinse and sanitization.hereas BACs are positivel* charged, these sanitizers are negativel* charged. !heir activit* is moderatel* aected b* -ater hardness. !heir lo- use p/, detergenc*, stabilit*, lo- odor potential, and non( corrosiveness mae them highl* desirable in some applications.)isadvantages include relativel* high cost, a closel* dened p/ range of activit* %p/ 2 to 3', loactivit* on molds and *easts, ecessive foaming in C s*stems, and incompatibilit* -ith cationic surfactant detergents. /atty +cid 4anitiers
;att* acid or carbo*lic acid sanitizers -ere developed in the 1@D8s. !*pical formulations include fatt* acids plus other acids %phosphoric acids, organic acids'. !hese agents also have the dual function of acid rinse and sanitization. !he maEor advantage over acid anionics is lo-er foaming potential. !hese sanitizers have a broad range of activit*, are highl* stable in dilute form, are stable to organic matter, and are stable to high temperature applications.!hese sanitizers have lo- activit* above p/ 3.7F?.8, are not ver* eective against *easts and molds, and some formulations lose activit* at temperatures belo- 18GC %78G;'. !he* also can be corrosive to soft metals and can degrade certain plastics and rubber. Pero9yacetic +cid 'P++(
/as been no-n for its germicidal properties for a long time. /o-ever, it has onl* found food(industr* application in recent *ears and is being promoted as a potential chlorine replacement. AA is relativel* stable at use strengths of 188 to 288ppm. ther desirable properties include absence of foam and phosphates, locorrosiveness, tolerance to hard -ater, and favorable biodegradabilit*. AA solutions have been sho-n to be useful in removing biolms.hile precise mode of action
mechanisms have not been determined, it is generall* theorized that the AA reaction -ith microorganisms is similar to that of /. AA, ho-ever, is highl* active against both gram(positive and gram(negative microorganisms. !he germicidal activit* of AA is dramaticall* aected b* p/. An* p/ increase above 9FD drasticall* reduces the activit*.AA has a pungent odor and the concentrated product %?8H' is a highl* toic, potent irritant, and po-erful oidizer. !hus, care must be used in its use. C.3. &plain the advantages and disadvantages of dierent chemical sanitizers. +dvantages and Disadvantages o Di;erent Chemical 4anitiers Chemical Chlorine
Concentrati Contact on Time &% <
=ater >& seconds and !%%?/
Iodine
!$1&6$& <&?/
-% seconds
Quaternar y +mmoniu m Com
A to $%% <&?/
-% seconds
+dvantage E;ective on a =ide variety o acteria@ highly e;ective@ not a;ected y hard =ater@ generally ine9
/orms ro=n color that indicates strength@ not a;ected y hard =ater@ less irritating to the skin than is chlorine@ and activity not lost ra
Disadvantage Corrosive# irritating to the skin# e;ectiveness decreases =ith increasing <0 o solution@ deteriorates during storage and =hen e91%(@ should not e used in =ater that is at !$%?/ or hotter@ and might discolour e7ui
D1 +<
Chemical
Concentrati on
+dvantage
Disadvantage
+cid6 +nionic 4anitiers /atty +cid 4anitiers Pero9yace tic +cid 'P++( * Student’s work will be evaluated according to the content and accuracy of their diagrams.
IB1 +ssignment n one -hole sheet of paper, ans-er the follo-ing. 1. hat are the things needed in cleaning itchen premises0 2. /o- are *ou going to clean a itchen0
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6oted +LN P1 BILL+NAEB+ G8 T1L1E1 Teacher
