{"id":444,"date":"2026-04-13T01:09:55","date_gmt":"2026-04-12T18:09:55","guid":{"rendered":"http:\/\/www.tneutron.net\/pangan\/?p=444"},"modified":"2026-04-10T10:17:18","modified_gmt":"2026-04-10T03:17:18","slug":"microbial-contamination-tapioca-quality","status":"publish","type":"post","link":"https:\/\/www.tneutron.net\/pangan\/microbial-contamination-tapioca-quality\/","title":{"rendered":"Microbial Contamination Tapioca Quality"},"content":{"rendered":"<p><span class=\"notranslate\"><strong>(1) Preparation and homogenization of the sample for Total Plate Count test and Escherichia coli<\/strong><\/span> <strong><br \/>\n<\/strong> <span class=\"notranslate\"> <strong>Principle:<\/strong><\/span><br \/>\n<span class=\"notranslate\"> Liberation of bacterial cells that may be protected by food particles and to reactivate the cells viability of bacteria that may be reduced due to unfavorable conditions in the food.<\/span> <span class=\"notranslate\"> Preparation and homogenization of the sample intended that bacteria well distributed in the food sample set.<\/span><\/p>\n<p><span class=\"notranslate\"> <strong>Equipment:<\/strong><\/span><br \/>\n<span class=\"notranslate\"> (a) appropriate homogenization equipment (blender) with a rotation speed of 10000 rpm to 12000 rpm;<\/span><br \/>\n<span class=\"notranslate\"> (b) Autoclaves<\/span><br \/>\n<span class=\"notranslate\"> (c) electric heater;<\/span><br \/>\n<span class=\"notranslate\"> (d) the balance sheet capacity of 2000 g calibrated to the nearest 0.1 g;<\/span><br \/>\n<span class=\"notranslate\"> (e) measuring flask 1000 ml, 500 ml, and 50 ml calibrated;<\/span><br \/>\n<span class=\"notranslate\"> (f) The glass trophy sterile;<\/span><br \/>\n<span class=\"notranslate\"> (g) sterile Erlenmeyer;<\/span><br \/>\n<span class=\"notranslate\"> (h) Bottle sterile diluent;<\/span><br \/>\n<span class=\"notranslate\"> (i) Pipette volumetric sterile;<\/span> <span class=\"notranslate\"> 10.0 mL and 1.0 mL calibrated, fitted with a bulb and pipettos<\/span><br \/>\n<span class=\"notranslate\"> (j) the reaction tube;<\/span> <span class=\"notranslate\"> and<\/span><br \/>\n<span class=\"notranslate\"> (k) spoon, scissors, and a sterile spatula.<\/span><\/p>\n<p><span class=\"notranslate\"> <strong>Diluting solution:<\/strong><\/span> <strong><br \/>\n<\/strong> <span class=\"notranslate\"> Butterfield&#8217;s Phosphate-Buffered Water dilution (BPB);<\/span><br \/>\n<span class=\"notranslate\"> (a) KH2PO4 34 g<\/span><br \/>\n<span class=\"notranslate\"> (b) Distilled water 500 ml<\/span><br \/>\n<span class=\"notranslate\"> Adjust the pH with NaOH to pH 7.2, align the volume to 1000 ml with distilled water.<\/span> <span class=\"notranslate\"> Sterilization at 121 \u00b0 C for 15 minutes.<\/span> <span class=\"notranslate\"> Store in refrigerator to make a diluting solution of 1.25 mL of stock solution was diluted with distilled water to a volume of 1000 ml, then put in a bottle of 450 ml diluent and into as many as 9 ml test tube and sterilized at 121 \u00b0 C for 15 minutes.<\/span><\/p>\n<p><span class=\"notranslate\"> <strong>Homogenization example:<\/strong><\/span> <strong><br \/>\n<\/strong> <span class=\"notranslate\"> (a) Weigh 50 g sample aseptically into the diluent bottle that had contained 450 ml of sterile diluent in order to obtain a dilution of 1:10, and<\/span><br \/>\n<span class=\"notranslate\"> (b) Shake the mixture several times so homogeneous.<\/span><\/p>\n<p><span class=\"notranslate\"> <strong>(2) The number of total plate (35oC, 48 hours)<\/strong><\/span> <strong><br \/>\n<\/strong> <span class=\"notranslate\"> <strong>Principle<\/strong><\/span><br \/>\n<span class=\"notranslate\"> Mesophyll aerobic bacterial growth after the sample was incubated in the appropriate seeding for 48 hours at a temperature (35 \u00b1 1) \u00b0 C.<\/span><\/p>\n<p><span class=\"notranslate\"> <strong>Equipment:<\/strong><\/span><br \/>\n<span class=\"notranslate\"> (a) Incubator (35+ 1) \u00b0 C calibrated;<\/span><br \/>\n<span class=\"notranslate\"> (b) Oven \/ dry sterilizer calibrated.<\/span><br \/>\n<span class=\"notranslate\"> (c) autoclave;<\/span><br \/>\n<span class=\"notranslate\"> (d) circulating water bath (45+) oC<\/span><br \/>\n<span class=\"notranslate\"> (e) Equipment colony counter;<\/span><br \/>\n<span class=\"notranslate\"> (f) Tally register;<\/span><br \/>\n<span class=\"notranslate\"> (g) 160 mL diluent bottle, made of borosilicate glass, with a rubber stopper or a screw cap plastic;<\/span><br \/>\n<span class=\"notranslate\"> (h) measuring 1 mL sterile pipettes with 0.1 mL scale equipped bulb or pipettor;<\/span> <span class=\"notranslate\"> and<\/span><br \/>\n<span class=\"notranslate\"> (i) Petri dish glass \/ plastic sterile (minimum size 15 mm x 90 mm).<\/span><\/p>\n<p><span class=\"notranslate\"> <strong>Hatcheries and thinners:<\/strong><\/span> <strong><br \/>\n<\/strong> <span class=\"notranslate\"> Plate count agar (PCA)<\/span><br \/>\n<span class=\"notranslate\"> (1) Tryptone 5 g<\/span><br \/>\n<span class=\"notranslate\"> (2) Yeast extract 2.5 g<\/span><br \/>\n<span class=\"notranslate\"> (3) Glucose 1 g<\/span><br \/>\n<span class=\"notranslate\"> (4) To 15 g<\/span><br \/>\n<span class=\"notranslate\"> (5) 1000 ml of distilled water<\/span><br \/>\n<span class=\"notranslate\"> Dissolve the above materials into a 1000 ml with distilled water and adjust the pH to 7.0.<\/span> <span class=\"notranslate\"> Put it in a bottle.<\/span> <span class=\"notranslate\"> Sterilized using an autoclave at 121 \u00b0 C for 15 minutes.<\/span><\/p>\n<p><span class=\"notranslate\"> <strong>Ways of working:<\/strong><\/span> <strong><br \/>\n<\/strong> <span class=\"notranslate\"> (a) Make a dilution rate as needed such as in Figure 1 using a diluent solution Butterfield&#8217;s Phosphate-Buffered Water dilution (BPB);<\/span><\/p>\n<p><a href=\"http:\/\/www.tneutron.net\/pangan\/wp-content\/uploads\/sites\/6\/2015\/09\/image12.png\"><img loading=\"lazy\" decoding=\"async\" title=\"image\" src=\"http:\/\/www.tneutron.net\/pangan\/wp-content\/uploads\/sites\/6\/2015\/09\/image_thumb12.png\" alt=\"image\" width=\"428\" height=\"379\" border=\"0\" \/><\/a><br \/>\n<span class=\"notranslate\"> Figure 1. The level of dilution using a diluting solution dilution Butterfield&#8217;sPhosphate-Buffered Water (BPB)<\/span><br \/>\n<span class=\"notranslate\"> (b) Pipette each 1 ml of dilution rate (F) 10-1 to 10-4 in a sterile petri dish in duplicate,<\/span><br \/>\n<span class=\"notranslate\"> (c) Pour 12 ml to 15 ml of PCA medium that is still liquid with a temperature (45 \u00b1 1) \u00b0 C into each Petri dish,<\/span><br \/>\n<span class=\"notranslate\"> (d) Shake the Petri dish with caution (rotary and rocking forwards, backwards, to the right and to the left) so that the sample and seeding evenly mixed and solidified;<\/span><br \/>\n<span class=\"notranslate\"> (e) Work on blank examination by mixing dilution water for each sample examined,<\/span><br \/>\n<span class=\"notranslate\"> (f) Allow the mixture solidifies in a petri dish,<\/span><br \/>\n<span class=\"notranslate\"> (g) Put all the petri dish upside down into the cabinet incubator at 35 \u00b0 C for (48 \u00b1 2) hours, and<\/span><br \/>\n<span class=\"notranslate\"> (h) Record growth colony (n) in each petri dish containing 25 to 250 colonies colonies after 48 hours.<\/span><\/p>\n<p><span class=\"notranslate\"> <strong>How to calculate:<\/strong><\/span><br \/>\n<span class=\"notranslate\"> (a) Select a petri dish from a dilution that shows the number of colonies between 25 colonies of up to 250 colonies per petri dish.<\/span> <span class=\"notranslate\"> Calculate all the colonies in Petri dishes using a colony counter.<\/span> <span class=\"notranslate\"> Calculate the average number of colonies and multiply by the dilution factor.<\/span> <span class=\"notranslate\"> Express the result as the number of bacteria per gram;<\/span><br \/>\n<span class=\"notranslate\"> (b) if one of two Petri dishes are a smaller number of colonies from 25 colonies to or greater than 250 colonies, count the number of colonies are located between 25 colonies of up to 250 colonies and multiply by the dilution factor.<\/span> <span class=\"notranslate\"> Express the result as the number of bacteria per gram;<\/span><\/p>\n<p><span class=\"notranslate\"> <strong>(3) Escherichia coli<\/strong><\/span> <strong><br \/>\n<\/strong> <span class=\"notranslate\"> <strong>Principle:<\/strong><\/span><br \/>\n<span class=\"notranslate\"> Growth of Escherichia coli is characterized by the formation of gas in the Durham tube, followed by biochemical tests and further referenced in Table APM (Figures Most Likely).<\/span><\/p>\n<p><span class=\"notranslate\"> <strong>Equipment:<\/strong><\/span><br \/>\n<span class=\"notranslate\"> (a) Incubators (35 \u00b1 1) \u00b0 C;<\/span><br \/>\n<span class=\"notranslate\"> (b) a water bath with a closed circulation system, (45.5 \u00b1 0.2) \u00b0 C;<\/span><br \/>\n<span class=\"notranslate\"> (c) Rack for test tubes;<\/span><br \/>\n<span class=\"notranslate\"> (d) Pipette measuring 10 mL and 1 mL of 0.1 mL scale;<\/span><br \/>\n<span class=\"notranslate\"> (e) the diluent bottle made of borosilicate glass, with screw cap \/ plastic;<\/span><br \/>\n<span class=\"notranslate\"> (f) Test tube and tube Durham;<\/span><br \/>\n<span class=\"notranslate\"> (g) glass petri dish the size of 15 mm x 100 mm or plastic size 15 mm x 90 mm, sterile;<\/span> <span class=\"notranslate\"> and<\/span><br \/>\n<span class=\"notranslate\"> (h) Needle ose (inoculation), with an inner diameter of approximately 3 mm.<\/span><\/p>\n<p><span class=\"notranslate\"> <strong>Seeding diluent and reagents:<\/strong><\/span> <strong><br \/>\n<\/strong> <span class=\"notranslate\"> (a) Lauryl sulfate tryptose (LST) broth \/ Lauryl tryptose (LT) broth;<\/span><br \/>\n<span class=\"notranslate\"> (b) Brilliant green lactose bile (BGLB) broth 2%;<\/span><br \/>\n<span class=\"notranslate\"> (c) Escherichia coli (EC) broth;<\/span><br \/>\n<span class=\"notranslate\"> (d) Levine&#8217;s eosin methylene blue (L-EMB) in order;<\/span><br \/>\n<span class=\"notranslate\"> (e) Plate count agar (PCA);<\/span><br \/>\n<span class=\"notranslate\"> (f) Gram stain;<\/span><br \/>\n<span class=\"notranslate\"> (g) Tryptone (tryptophane) broth;<\/span><br \/>\n<span class=\"notranslate\"> (h) Reagent Kovacs&#8217;;<\/span><br \/>\n<span class=\"notranslate\"> (i) Methyl red &#8211; voges Proskauer (MR &#8211; VP) broth;<\/span><br \/>\n<span class=\"notranslate\"> (j) voges Proskauer reagents;<\/span><br \/>\n<span class=\"notranslate\"> (k) A solution of methyl red;<\/span><br \/>\n<span class=\"notranslate\"> (l) Koser&#8217;s citrate broth;<\/span><br \/>\n<span class=\"notranslate\"> (m) Peptone diluents 0.1%;<\/span><br \/>\n<span class=\"notranslate\"> (n) Reagent indole;<\/span><br \/>\n<span class=\"notranslate\"> (o) 40% potassium hydroxide solution;<\/span><br \/>\n<span class=\"notranslate\"> (p) Buffer fields phosphate buffered dilution water;<\/span><br \/>\n<span class=\"notranslate\"> (q) alpha naphtol solution of 5%;<\/span> <span class=\"notranslate\"> and<\/span><br \/>\n<span class=\"notranslate\"> (r) Crystal creatine.<\/span><\/p>\n<p><span class=\"notranslate\"> <strong>Ways of working:<\/strong><\/span> <strong><br \/>\n<\/strong> <span class=\"notranslate\"> APM &#8211; Test predictions at Escherichia coli:<\/span><br \/>\n<span class=\"notranslate\"> (a) Make the preparation and homogenization of the sample as in 10.1,<\/span><br \/>\n<span class=\"notranslate\"> (b) Inoculate each 1 ml of each dilution rate (a solution of 10-1, 10-2 and 10-3) into three tubes Laurryl sulfate tryptose (LST) broth in which there are inverted Durham tube.<\/span> <span class=\"notranslate\"> Hold the dropper so that the lower end of the pipette attached to the tube.<\/span> <span class=\"notranslate\"> Let the pipette contents flowing 2 seconds to 3 seconds.<\/span> <span class=\"notranslate\"> Pipette not blown to remove its contents,<\/span><br \/>\n<span class=\"notranslate\"> (c) Insert the tubes into the incubator at 35 \u00b0 C for<\/span><br \/>\n<span class=\"notranslate\"> (48 \u00b1 2) hours,<\/span><br \/>\n<span class=\"notranslate\"> (d) Observe these tubes on the ke- hour (24 \u00b1 2).<\/span> <span class=\"notranslate\"> If there is a tube that had been containing gas, turbid then the tube is declared &#8220;positive&#8221;,<\/span><br \/>\n<span class=\"notranslate\"> (e) tubes containing gas that has not been declared &#8220;negative&#8221;, continue incubation for 24 hours,<\/span><br \/>\n<span class=\"notranslate\"> (f) Note the gas formation after incubation (48 \u00b1 2) hours, and the tube declared &#8220;positive&#8221;, and<\/span><br \/>\n<span class=\"notranslate\"> (g) Conduct a test tube affirmation of all that is positive for the test prediction.<\/span><\/p>\n<p><span class=\"notranslate\"> <strong>APM &#8211; Test affirmation for Escherichia coli:<\/strong><\/span><br \/>\n<span class=\"notranslate\"> (a) Transfer of one eye of each tube Ose LST positive EC broth tube into discrete,<\/span><br \/>\n<span class=\"notranslate\"> (b) EC Inkubasikan tubes into the circulating water bath, for (24 \u00b1 2) hours at temperature (45.5 \u00b1 0.2) \u00b0 C, the tube that has formed gas expressed &#8220;positive&#8221;,<\/span><br \/>\n<span class=\"notranslate\"> (c) If negative, Inkubasikan and check back in an hour ke- (48 \u00b1 2).<\/span> <span class=\"notranslate\"> If the gas has been formed, the tube is declared &#8220;positive&#8221;, and<\/span><br \/>\n<span class=\"notranslate\"> (d) Perform complete testing of all test tubes positive for confirmation.<\/span><\/p>\n<p><span class=\"notranslate\"> <strong>Full test for Escherichia coli:<\/strong><\/span> <strong><br \/>\n<\/strong> <span class=\"notranslate\"> (a) Shake tubes positive EC broth carefully,<\/span><br \/>\n<span class=\"notranslate\"> (b) Take Ose colony of one eye, then streaking \/ embedded in the cup so that the L-EMB, such that the resulting colonies were separated by a minimum distance of 0.5 cm,<\/span><br \/>\n<span class=\"notranslate\"> (c) L-EMB Inkubasikan cup for 18 hours up to 24 hours at a temperature (35 \u00b1 1) \u00b0 C,<\/span><br \/>\n<span class=\"notranslate\"> (d) check the vials for the presence of green colonies with or without metal lightning,<\/span><br \/>\n<span class=\"notranslate\"> (e) From each cup L-EMB, move up to 5 colonies suspicious on the tube for oblique PCA,<\/span><br \/>\n<span class=\"notranslate\"> (f) Inkubasikan tubes so that the slant for 18 hours up to 24 hours at a temperature of 35 \u00b0 C and used for the next test,<\/span><br \/>\n<span class=\"notranslate\"> (g) Prepare a Gram stain of every culture.<\/span> <span class=\"notranslate\"> E coli is a rod-shaped gram-negative and no berspora to be tested using IMViC reactions like this and should be inoculated back into LST broth tubes to confirm the existence of gas production.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>(1) Preparation and homogenization of the sample for Total Plate Count test and Escherichia coli Principle: Liberation of bacterial cells<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"colormag_page_container_layout":"default_layout","colormag_page_sidebar_layout":"default_layout","footnotes":""},"categories":[1820],"tags":[597,595,594,596],"class_list":["post-444","post","type-post","status-publish","format-standard","hentry","category-english","tag-high-quality-tapioca-maltodextrin","tag-quality-tapioca-pearls","tag-tapioca-quality","tag-tapioca-starch-quality"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Microbial Contamination Tapioca Quality - TN Pangan<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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