AFDC 05(6092 ) P3 
 
 
                  
DRAFT TANZANIA STANDARD  
 
 
 
 
 
 
Baking powder — Specification  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
TANZANIA BUREAU OF STANDARDS                                                                                                                       
AFDC 05( 6092 )P3 
 
 Baking powder — Specification  
 
0.  Foreword  
 
Baking powder finds widespread use as a ‘che mical leavener’ of dough for baked products. The constituents 
of baking powder are (a) sodium bicarbonate, (b) edible starch, and (c) acid reacting component(s).  
On wetting, the powder produces carbon dioxide by the reaction of the acid  on sodium bicarbo nate. The 
released carbon dioxide is entrapped in the batter or dough mix resulting in volume increase and lightened 
texture of baked goods.  
 
The starch in baking powder improves the product’s consistency and stability by absorbing moisture and thus 
prolonging its shelf life. By keeping the product dry, the starch prevents the powder's alkaline and acidic 
components from reacting with each other prematurely.  
 
This standard has been developed to keep up with advancements of the baking powder industry and to 
ensure the safety and quality of the product traded in the markets in order to safeguard the health of the 
consumers.  
In preparation of this Tanzania standar d assistance is derived from the following publications;  
IS1159 Baking Powder – Specification published by Bureau of India Standards (BIS)  
US 571 Baking Powder – Specification published by the Uganda Bureau of Standards (UNBS)   
 
In reporting the result of a test or analysis made in accordance with the Tanzania standard, if the final value 
observed or calculated is to be rounded off, it shall be done in accordance with TZS 4 (see clause 2)  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                                                                                                                        
AFDC 05( 6092 )P3 
 
  
1 Scope  
This Draft Tanzania  Standard specifies the requirements and methods for sampling and test of baking 
powder . 
2. Normative References  
The following referenced documents are referred to in the text in such a way that some or all of their content 
constitute requirements of this document. For dated references, only the edition cited applies. For undated 
references, the latest edition of the referenced document (including any amendments) applies.  
 
TZS 116, Labelling of food additives when sold as such  — General requirements  
 
TZS 507 , Sodium bicarbona te — Specification  
 
Codex 193, General standard for contaminants and toxins in food and feed  
 
ISO 760, Determination of water  — Karl Fischer Method (General method)  
 
TZS 4,  Rounding off numerical values.  
 
TZS 538, Labelling of pre \-packaged foods — General  requirements  
 
TZS 109, Food processing units – Code of hygiene  
 
TZS 111, Bakery and biscuit manufacturing units – Code of hygiene  
 
3 Terms and definitions  
 
For the purposes of this document, the following terms and definitions apply.  
 
3.1 baking powder  
Is a leavening agent prepared from an acid -reacting material and sodium or potassium bicarbonate with or 
without the addition of other ingredients for the purpose of producing a leavening effect during the baking 
process of a foodstuff.  
 
3.2 edible starch  
is a white, tasteless and odorless substance that is insoluble in cold water or alcohol.  
 
3.3.chemical leavener  
is a chemical substance, except baking powder, with or without the addition of other ingredients as specified 
in these regulations, which is capab le of producing a leavening effect during the baking process of a foodstuff.  
 
3.4 food grade material   
material made of substances which are safe and suitable for their intended use and which will not impart any 
toxic substance or undesirable odour or flavour to the product  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                                                                                                                        
AFDC 05( 6092 )P3 
 
  
 
 
 
4. Requirements  
 
4.1 General requirements  
Baking powder shall be in the form of a free -flowing white powder, free from off odors, dirt, insect infestations, 
, foreign matter and adulterants.  
 
4.2 Ingredients  
 
Baking powder shall contain the following ingredients:  
 
a) refined grade sodium bicarbonate conforming to TZS 507;  
 
b) edible starches such as maize starch and cassava starch   
 
c) One or a combination of the following acid reacting components:  
 
sodium acid pyrophosphate with or without mono acid calcium phosphate;  
 
mono acid calcium phosphate with or without dicalcium orthophosphate;  
 
potassium hydrogen tartrate or tartaric acid or a mixture of both;  
 
acid compounds of aluminium; and glucono delta lactone.  
 
 
4.2.2 Optional ingredients:  
 
neutral material such as calcium lactate, anhydrous calcium sulphate and sodium sulphate  
 
 
4.3  Specific requirements  
 
4.3.1  Physicochemical requirements   
 
Baking powder shall comply with the physicochemical requirements in Table 1 when tested in accordance 
with the test methods specified therein.  
 
Table 1 — Physicochemical requirements for baking powder    
S/N Characteristic  Requirement  Test method  
    
i. Available carbon dioxide, % (m/m), min.  12 Annex A  
    
ii. Moisture % (m/m), max.  2 ISO 760  
    
 
5. Food additives  
Only the food additives permitted by CODEX STAN 192 in the manufacture of baking powder may be used 
without exceeding the limits.  
6. Hygiene  
6.1 Baking Powder shall be prepared and packaged in premises built and maintained under hygienic condition 
in accordance with TZS 109 and TZS 111.  
 
6.2   Baking powder shall be free from pathogenic organisms.  
 
 
 
                                                                                                                        
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6.3 Contaminants  
 
Baking powder shall comply with the maximum levels for the contaminants  given in Table 2 when tested in 
accordance with the test methods specified therein.  
 
Table 2 — Permitted maximum levels of contaminants in baking powder   
S/N Heavy metal  Requirement  Test method  
    
i. Lead (Pb), mg/kg, max.  1 AOAC 999.11  
    
ii. Copper (Cu), mg/kg, max.  2 AOAC 999.11  
    
iii. Arsenic (As), mg/kg, max.  0.05 AOAC 920.46 (B)  
    
 
7. Sampling  
 
Representative samples of the product shall be drawn in accordance with the procedure elaborated in Annex 
B.  
 
8. Packaging, marking and labeling  
 
8.1 The products shall be packaged in clean and airtight food grade materials.  
 
8.2  Marking and Labelling  
 
8.2.1 In addition to the requirements of TZS 538 and TZS 116, the product packages shall be legibly and 
indelibly labelled with the following information:  
 
i) Name of the product as “Baking powder”  
 
ii) Name and physical address of the manufacturer,  
iii) Batch or code number,  
iv) Net weight, in grams (g) or kilograms (kg),  
v) List of ingredients in descending order of proportion,  
vi) Date of manufacture,  
vii) Expiry date,  
viii) Country of origin,  
ix) Storage instructions,  
x) Instructions of use (These could as well be on an accompanying leaflet)  
 
8.2.2  The language on the label shall be “Kiswahili” or Kiswahili and English. A second language may be used 
depending on the designated market.  
8.2.3         The packages of the buns may also be marked with the TBS certification mark.                                                                                                                         
AFDC 05( 6092 )P3 
 
 NOTE - The TBS Standards M ark of Quality may be used by the manufacturers only under licence 
from TBS. Particulars of conditions under which the licences are granted, may be obtained from TBS.  
 
 
 
 
 
Annex A  
(normative)  
 
Determination of available carbon dioxide  
 
A.1 Introduction   
Two methods have been described. Any can be used depending on the available facilities.  
 
A.1 Method One  
 
A.1.1 Apparatus  
 
Schroedter's alkalimeter, as shown in Figure 1  
 
A.1.2 Reagent  
Sulphuric acid  
Distilled water (H2O)  
 
A.1.3 Procedure  
Fill bulb (A) with distilled water and bulb (B) with sulphuric acid to a height of 25 mm above port (C) through 
which carbon dioxide escapes into the acid. Weigh the alkalimeter ( M). Introduce 1 g of sample through side 
opening (D) into the decomposition f lask (E). Weigh the alkalimeter again ( M2). Open the stopcock (F) and 
allow about 25 ml of distilled water to flow into (E). Allow the initial vigorous reaction to subside. Place the 
apparatus over a flame and boil the solution for about 3 minutes. Aspirat e carbon dioxide free air through the 
solution by applying suction at G, the air first passing through soda lime. Weigh the alkalimeter again ( M1). 
 
 
 
Figure 1: Schroedter's alkalimeter  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                                                                                                                        
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A.1.4 Calculation  
 
 
Available carbon dioxide, percent by mass =  
 
                              100 ( M2-M1) 
                                      M2-M 
where   
 
M2 is the mass, in grams, of alkalimeter with sample, before decomposition;  
M1 is the mass, in grams, of  alkalimeter with sample, after decomposition; and  
 
M is the mass, in grams, of alkalimeter before introducing the sample.  
 
 
A.2 Method Two  
 
A.2.1 Apparatus  
 
Gasometric assembly, as shown in Figure 2.  
Extraction flask  
 
The apparatus consists of a 250 ml, wide mouthed extraction flask (A) made of heat resistant glass connected 
by a short bent glass tube to a rubber tube (B). B is connected by a two -way stopcock (C) to a gas measuring 
tube (D) graduated in millilitres; the  zero mark at the point just below the top and graduated up to 500 ml. 
Additionally connected to flask A is a 40 ml burette (H) graduated in millimetres. The gas measuring tube is 
connected to a levelling tube (F) through a rubber tube (E) having a pinchco ck (P) to control the flow of the 
solution.  
 
 
Figure 2 — Gasometric assembly  
 
A.2.2 Reagent  
 
Distilled water sodium chloride or sodium sulphate sodium bicarbonate 0.5 % methyl orange sulphuric acid or 
hydrochloric acid  
 
A.2.3 Procedure  
 
Preparation of solution for gas measuring  
Displacement solution — Dissolve 100 g of sodium chloride or sodium sulphate  in 350 ml of distilled water. 
Accurately add 1 g of sodium bicarbonate (conforming to TZS 507) and 2 ml methyl orange (0.5% aqueous 
solution) and then enough sulphuric acid or hydrochloric acid to turn the solution acidic (solution turns to pale 
pink). St ir until all the released carbon dioxide is removed.  
 
This solution is used in the gas measuring tube and the levelling bulb and seldom needs correction.   
Accurately weigh 2.5 g of the sample into flask (A) . Using the two -way stopcock (C), connect the gas 
measuring tube (D) and levelling tube (F) to the atmosphere and through a funnel on the open end of tube F, 
fill both tubes with displacement solution up to the zero mark of tube D . Connect the decomposition flask A 
with rubber tube B and turn the stopcock  so that the gas measuring tube is connected to flask A and 
disconnected from the atmosphere. Fill burette (H) with distilled water up to the 40 ml mark and let the 
apparatus stand for 1 to 2 minutes so that the temperature and pressure within the apparatu s comes to room 
conditions. Open pinchcock and bring down the solution level in tube F to reduce pressure within the 
apparatus. Collect the displaced solution in a glass beaker and reserve for re -use later. Slowly add 35 ml of 
distilled water to decomposit ion flask, from burette H.  
 
 
 
 
 
                                                                                                                        
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To allow uniform mixing of contents and complete evolution of CO 2, occasionally rotate the decomposition 
flask by swirling and boil the flask and its contents over a tripod stand using a Bunsen burner. To prevent 
overflow ing of displacement solution in levelling tube, fill to a level lower than the overflow capacity. When the 
mixture in flask A foams up and the foam reaches the neck of the flask, stop heating and quickly immerse the 
decomposition flask in cold tap water ke pt in a tray below. Also pour water over the decomposition flask while 
rotating it to bring the contents to the temperature of water in the tray. When this happens wait for 5 minutes to 
secure equilibrium. Equalize pressure in the measuring tube by pouring  solution in levelling tube, using the 
pinchcock P if necessary and read the volume V in the measuring tube.  
 
A.2.4 Calculation  
 
Deduct from this volume V, the volume of distilled water added (35 ml) to get the correct volume of CO 2 
evolved after decomposition at atmospheric temperature and pressure.  
 
The volume of CO 2 evolved, in millilitres, at normal temperature and pressure shall be calculated as follows:  
  
where  
 
V2= T2 X P1V1  
      P2    P2T1  
 
V2 is the volume of CO 2, calculated at normal temperature and 
pressure;  T2 is the normal temperature (273 °K or 0 °C);   
P2. is the normal pressure (760 mm);   
P1 is the corrected barometric pressure at temperature  T1;  
V1 is the V - 35 ml = corrected volume of CO 2 evolved after decomposition; 
and T1 is the observed temperature of displacement solution.   
 
One gram mole (44 g) of carbon dioxide, at NTP will occupy 22 400 ml, that is, 22 400 ml of CO 2 at 
NTP, weigh 44 g.  
 
V2 ml CO 2 a obtained from 2.5 g of baking powder NTP will weigh, in grams:  
 
 
V2   X   44  
22400     1  
 
 
 
 
100  V   40 
 V2 
 
44 Therefore, available carbon dioxide, percent by mass   =  
  2 
  44 = 
 
 
 
. 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                                                                                                                        
AFDC 05( 6092 )P3 
 
  
Annex B  
(normative)  
 
Sampling of baking soda  
 
B.1 General requirements of sampling   
 
In drawing, preparing, storing and handling samples, the following precautions and directions shall be 
observed.  
 
- The product shall be kept in a protected place not exposed to damp air, dust or soot.  
 
- The sampling instrument shall be clean and dry when used.  
 
- Precautions shall be taken to protect the samples, the material being sampled, the sampling 
instrument and the containers for samples from contamination.  
 
- The samples shall be placed in clean, odourless and dry glass containers. The sample containers 
shall be of such size that they are almost completely filled by the sample.  
 
- Batch c ontainers shall be sealed airtight after filling and marked with full details of sampling, batch or 
code number, name of the manufacturer and other important particulars of the consignment.  
 
- Samples shall be stored following the product storage conditions prescribed by the manufacturer.  
 
- Sampling shall be done by a qualified and authorised person.  
 
B.2 Scale of sampling  
 
The number of containers to be tested from a lot shall depend on the size of the lot and shall be in accordance 
with Table 2.  
 
Table 2 — Number of containers to be selected for sampling   
Total Number of containers in the lot  Number of containers to be selected  
(N) (n) 
  
Up to 50  3 
  
51 to 100  4 
  
101 to 300  5 
  
301 to 500  6 
  
501 and above  7 
  
 
 
 
 
 
 
 
 
 
 
 
                                                                                                                        
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B.3 Random sampling  
 
Sampling shall be done randomly from the lot and random number tables shall be used. In case such tables 
are not available, the following procedure may be adopted:  
 
Starting from any container, count them as 1, 2, 3, …..r and so on, in one order. Every rth container counted   
shall be chosen, r being the integral part of N/n, where N is the total number of containers in the lot and n the 
number of samples to be selected as shown in Table 2.  
 
B.4 Test samples and referee samples  
 
B.4.1 Preparation of individual samples  
 
Empty the container on a clean sheet of paper and mix thoroughly. Cone and quarter as often as necessary 
till about 75 g of the material is left. From this, take about 15 g of the material and divide it into three equal 
parts. Each part  so obtained shall constitute an individual sample representing the container and shall be 
transferred immediately with particulars given in B.1 (e). The individual samples obtained shall be divided into 
three sets in such a way that each set has a sample representing each selected container. One of these sets 
shall be marked for the purchaser, the other for the vendor and the third being the referee sample.   
 
B.4.2 Preparation of a composite sample  
 
Equal quantities of the product shall be taken the contai ners from where the individual samples were obtained 
and mixed together to obtain a composite sample weighing not less than 160 g. This composite sample shall 
be divided into three equal parts and transferred to clean dry glass containers and labelled with  the particulars 
given in B.1 (e). One of these composite samples shall be marked for the purchaser, the other for the vendor 
and the third being a referee sample.  
 
B.4.3 Referee samples  
 
Referee samples shall consist of a set of individual samples (B.4.1)  and a composite sample (B.4.2) marked 
for this purpose and shall bear the seals of the purchaser and the vendor. These shall be kept at a place 
agreed to between the two.  
 
B.5 Number of tests  
 
Tests for requirements given in 5.1 and 5.2.1 (Table 1) shall be conducted on each set of individual samples.  
 
Tests for contaminants (Table 2) shall be conducted on the composite sample (B.4.2).  
 
B.6 Criteria for conformity  
 
The lot shall be declared to be in conformity with all the requirements of this specificatio n, if it has been found 
satisfactory in accordance with B.5.  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                                                                                                                        
AFDC 05( 6092 )P3 
 
  
 
 
 
 
Bibliography  
 
 
IS 1159 (1981) (Reaffirmed in 2010) — Specification for baking powder (First Revision)  
 
US 571: 2006, Baking powder — Specification  
 
KS 346: 2000, Specification for baking powder (First Revision)   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                                                                                                                        
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© TBS 2018 – All rights reserved  11   AFDC 5 ( 6092 ) P3 
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DRAFT TANZANIAN STANDARD