Showing posts with label residue. Show all posts
Showing posts with label residue. Show all posts

Thursday, September 1, 2016

The "Bromate in bread" controversy-Where lies the truth?

The recent controversy regarding the presence of potassium bromate residues in bread and other wheat based bakery preparations does not help either the consumer or the industry. While it showed bakery industry as a villain, consumers became weary about the industry giving an impression that the products churned out by this sector are not safe. According to the organization which splashed this news based on a study of a few samples picked up from the Delhi market, since bromates are carcinogenic, bread made with this chemical is not safe for human consumption. Probably it may have a point and safety authorities need to look into this issue more carefully and dispassionately. Decision to ban must be taken based on facts and ground reality, not as a knee-jerk reaction. What is not understandable is the haste with which the authors of this study had gone to the press which can only serve to create panic among the consuming public. FSSAI, the "Authority" sitting in Delhi seems to have been woken up from its slumber mode and since it has authority to ban any products as it did with maggi noodles last year, one can only expect a similar reaction from this babu organization. But it is time the consumers realize the reality, give the report a cursory glance and go on with their lives till more definitive data emerge on this issue.

According to the Center for Science and Environment, a Delhi based consumer watch dog, Indian bread may cause cancer because of the existing practice of the baking industry using potassium bromate for improving the raising quality of the bread. Not only that it also includes besides bread other products like pizza, burger etc as potential cancer causing products about which consumers must be aware. It further declares that potassium iodate, an approved additive in bakery products, has the potential to adversely affect thyroid functions in human beings and therefore needs to be banned. Lo, there goes the declaration by the FSSAI banning bromate for use in food products in India and further assures the public that it would examine iodate regarding its ill effects on humans! Steps in our over concerned Mantriji, the custodian of health of the population in India, cautioning the public against panic as he is "fully seized" of the matter. He further assures the public that a thorough investigation will be undertaken to find out whether these chemicals already approved by FSSAI are really dangerous and take "appropriate action" if so. Of course every body knows that he and his ministry will promptly forget about this issue and move on to the mundane things they are doing to protect the health of Indian people!  

For those not knowing what is potassium bromate and why it is used in bakery products, it is appropriate to peep into into its history. Potassium bromate, or commonly referred to as bromate, is an oxidiser deployed to strengthen wheat dough so that its elasticity is increased, besides helping to get a uniform bake and white color for the final product viz bread. Usual practice is to use 15-30 parts per million (ppm) of potassium bromate in the flour before making the dough. For a number of years this chemical was being used extensively by the baking industry across the world with no adverse report coming from any where. One of the reasons why it is considered a safe practice is that bromate gets destroyed at the high baking temperatures which is required to make a good bread. It is well known that at the baking temperatures normally no residue is supposed to be left behind to cause any ill effect. Of course if good manufacturing practices are not followed, especially use of high concentrations of bromate or under baking, possibility of some residue remaining cannot be ruled out. 

Is use of bromate confined only to India? Of course not. There are a few countries like the US which permit use of bromates but under the condition that there is zero residue left in the product after baking. Many countries, to be on the safer side out rightly banned use of bromates. Though earlier a limit of 75 ppm was allowed which was reduced to 60 ppm later, subsequent international studies did find bromate to be of carcinogenic potential and advised all countries to avoid using it as far as possible since alternative safer additives are available to achieve the same objective as a flour improver. It was in 2012 that the Codex Alimentarius Commission of FAO/WHO withdrew specifications for bromate from its official list implying that its use should be discontinued. However, India, though a member of the Codex did not bother to implement the recommendations of this body and continued permitting bromate in the country for reasons known best to FSSAI. Is it not ironical that FSSAI has to be woken up by the limited studies of the Delhi organization to remove bromate from the list of permitted food additives? 

Before we take the side of the consumer, it is only fair to listen to the compulsions of the bakery industry in India as to why it is persisting with the use of bromate, in spite of the adverse views of the Codex. Most logical explanation would be that it is legally permitted in the country and no one can find fault with it. Interestingly in a country like the US where 60-75 ppm of bromate is legally allowed many major bakery players have shunned its use voluntarily, finding alternate flour improvers like  ascorbic acid, ammonium persulfate, ammonium chloride, amylase, glucose oxidase  etc. The attraction for the industry to use bromate is that it is the cheapest flour improver in the market, all others costing considerably more. It is the contention of the bakery industry that if it is forced to stop use of bromate, the bread prices may go up due to increased cost of manufacture. Probably this is an argument no body is going to buy that easily! The industry feels that since FSSAI does not want to shoulder the responsibility of monitoring the bromate residues in bread regularly, it is exercising its power to ban this chemical. May be there is a point but responsible industry leaders must understand that monitoring thousands of small and micro scale bakeries across this vast country is not that easy and therefore it must accept gracefully the decision to discontinue use of bromate in the country. As for potassium iodate it is not used widely in India in food preparations though it is a recommended source of iodine for fortification of salt to prevent on set of the goiter disease among the population. Probably banning this chemical may affect the salt fortification project promoted by the government. 

If the industry is to be believed the report by the Delhi organization regarding the safety of bread in India based on a limited study confined only to Delhi has caused a severe backlash against bakery products in the country as it has touched a raw nerve among the consumers, causing significant damage to its business. May be it has a point as voluntary organizations publishing such reports needs to be controlled and there should be an alliance between such groups and the government for exchanging such information before making them public. After all GOI has big institutions like CFTRI, CDRI, NIFTEM, etc and veracity of such panic causing reports must be vetted by peer scientists from these institutes before being put on the public domain. However well equipped voluntary organizations are, their facilities and experience cannot come any where to that of GOI food research institutions and hence this caution.
V.H.POTTY
http://vhpotty.blogspot.com
http://foodtechupdates.blogspot.com

Sunday, August 23, 2009

SOLVENT EXTRACTION IN FOOD INDUSTRY-A CONSUMER HAZARD?


Use of solvents for extraction of active ingredients or removal of undesirable substances is one of the most common practice in the food industry. Water is the chosen solvent if the substance to be extracted or leached out is soluble in it. Other wise organic and inorganic solvents are required and depending on the solubility characteristics of the extractable material, different solvents are selected. The solvent extraction process generally involves use commercial Hexane to get soluble fractions, separation of the extract and desolventization to recover the extracted materials. Edible oil industry started using solvent extraction technology since 1930s for recovering oils from pressed residues of oil seeds and other oil bearing sources containing less than 20% oil.

Commercial Hexane is made up of 52% n-Hexane, 16% Methyl Cyclopentane, 16% of 3-Methyl Pentane, 13% of 2-Methyl Pentane and 3% Cyclohexane. It is one of the cheapest organic solvents available, being a distillate of petroleum industry. It is estimated that about 60 million tons of edible oils are produced by Hexane extraction technology and the most abundantly produced extracted oil is soy oil. Concerns have been raised regarding the dangers posed by presence of Hexane in extracted residues as well as in the edible oil products and without adequately analyzing the hazard potential, the industry is being damned. It is true that exposure of humans to Hexane can cause excessive inhalation through the lung route and many ill effects have been reported. A 15 minutes exposure to 800 ppm of Hexane can cause acute respiratory and eye problems,nausea, vertigo, head ache and such exposures are associated with neuropathy and other toxicity problems.

What causes concern to the food industry is the unsubstantiated claims that Hexane residues present in extracted foods pose dangers to the consumers. However the Environmental Protection agency of the US found no ill effect even when the residue was up to 0.2%, at least to the test animals. Cotton seed flour and hops extract for which maximum limits have been prescribed must not contain more than 60 ppm and 25 ppm of hexane respectively. WHO has not prescribed any limits for this solvent in any foods. No toxicity trial has ever implicated Hexane in any serious health disorders when foods containing low levels of residues are consumed orally. In fact people working in gas stations and those staying near by are more vulnerable to Hexane toxicity through inhalation. Probably the processing plants using Hexane as a solvent will have to be weary about the pollution they can cause if Hexane losses are not minimized during handling of this highly volatile solvent which can be any where between 0.15% to 0.5%. According to one estimate, the soy processing plants belonging to one of the giants in the US are responsible for an annual emission of more than 1 million pounds of Hexane to the environment. Annual Hexane loss by the edible oil industry is reported to be about 0.3 million tons. Still it is to be recognized that the Hexane level in the atmosphere rarely exceeds 2 parts per billion (ppb) whereas Hexane beyond 20 ppb only is considered undesirable.

Consumer scare mongering practice is neither good nor desirable based on inadequate data or misinterpreted information and must be checked in the interests of the consumer who has no where to go for getting at the truth. It is almost eight decades since solvent extraction process was established as a safe process and no evidence exists to implicate this technology in any human disaster. Of course use of organic solvents in general is not some thing industry favors but till alternative viable options are available, one has to live with this. Emergence of Super Critical CO2 Extraction technology does provide an option but the cost considerations rule out its use for low cost food material like oil bearing food sources. Damning a technology like the solvent extraction process, which provides bulk of the edible oil, a vital food constituent in the diet of mankind, based on unsubstantiated information, deserves to be frowned upon.
V.H.POTTY
http://vhpotty.blogspot.com/
http://vhpotty.foodtechupdates.blogspot.com