Showing posts with label aflatoxins. Show all posts
Showing posts with label aflatoxins. Show all posts

Monday, August 1, 2011

INDIAN SPICES EXPORT-THORNY ROAD AHEAD?

India is known from time immemorial as the golden land of spices, cherished all over the world. With rapid advances made in safety and quality assurance methodologies during the last two decades, world is not willing to accept any thing and every thing exported from the country under brand India. On the contrary any thing that originates from India is viewed with grave suspicion regarding its quality and if it is food, about its safety. Still, being the foremost producer of many spices leeway was always given to the Indian exporters to mend them selves and supply products conforming to internationally accepted quality and safety requirements. How far such considerations are going to help the country if there is no genuine desire to implement steps that will ensure safety of exported products on the part of growers and their agents who predominate the export trade?.

India was supposed to have produced about 3.2 million tons of spices, constituting almost 80% of world production and out this more than half a million ton was exported fetching the country foreign exchange to the tune of US$ 1.5 billion. Out of the 109 spices covered under the ISO, 52 spices are considered important for India to export because of their significant production in the country. Indian Spices Board of GOI is vested with the task of coordinating the export of these valuable crops and value added products derived from them. Continuous increase in export of spices, in spite of many infrastructural constraints speaks well about the performance of the Spice Board till recently and full credit to it for enhancing the portion of value added products from spices in the total spice export beyond 50%.

Europe is a major destination for Indian spices and being very sensitive to dangers of food poisoning EU food safety authorities have been continuously raising the bar to achieve zero tolerance for contaminated foods, from where ever they are. One can understand the concerns of the Union, especially after the recent E.coli pandemic killing several people, traced to imported Fenugreek from Egypt. It was in 2010 EU introduced the Rapid Alert System for Feed and Food (RASFF) for identifying contaminated imports as defined by their standards and currently 50% of all shipments entering the EU region are subjected to rigorous inspection for quality and safety. Knowing fully well that such strict safety protocols are enforced, it should have been the responsibility of Spice Board to radically modify the export regime and it is unfortunate that the short comings, some of them serious, were uncovered by the technical team from EU that visited the country recently. Below is reproduced verbatim some of the findings of this team which wanted the country to take adequate steps to address the short comings immediately.

"The supervision of control authorities of spice growers is not robust enough. There is a failure to ensure producers are implementing Good Manufacturing Practices (GMP) or Good Agricultural Practices (GAP). Advisory services on these practices do exist but not all farmers, particularly larger-scale ones, are covered by these and therefore they might not be fully aware of GAP procedures, said the FVO report. Instead, Indian officials have focussed on implementing aflatoxin controlsprior to export. While a string of procedures are in place, the inspectors said many of the measures do not meet EU standards. Indian spices are one of the products subject to heightened scrutiny under EC Regulation 669/2009 as a result of the higher than average RASFF notifications on the presence of aflatoxins in the foods. Currently, some 50 per cent of shipments undergo physical inspection at EU borders. Following the introduction of the measure in 2010, the number of RASFF notifications jumped by 600 per cent to 98, compared to 12 in the previous 12 months. While legislation has been introduced in India to regulate its 3,500 spice exporters - of which 220 ship into the EU - there are some gaps. There are no clear food hygiene rules laid down for food companies, including spice processors and it is not obligatory to implement Hazard Analysis and Critical Control Points (HACCP). "The level of HACCP implementation in companies processing spices for export to the EU is very low," said the report. Spice processors or traders exporting their produce are not subject to any food hygiene control - and therefore there is no official body to ensure they comply with EU requirements, it added".

One of the deficiencies of the Spice Board pointed out from time to time is its ability to get top notch scientists to be a part of its technical team which could inspire confidence among the buying countries. It is time this inadequacy is seriously addressed in the interest of protecting the nation's exports. Aflatoxin is a contaminant in many spices at the field level post-harvest handling level which cannot be avoided unless good agricultural practices GAP) are adopted by the growers, many of whom are small land holders. This is where help is needed by the growers in the form of technical training and investment for upgrading their operations. Earlier this is done better it will be for the spice industry in the country.

Wednesday, May 20, 2009

AFLATOXIN MENACE-THE 'CURSE' OF PEANUTS



Though peanut is considered a wholesome food rich in proteins, fats and many nutrients vital to the body, it was shunned for some time by the international buyers, because of the presence of mycotoxins, the hazardous metabolic product of the mold belonging to Aspergillus species which contaminates the crop mostly in the field due to improper drying. Its good thermal stability at high temperatures make it hard to destroy during processing and mold infected raw material if used will taint the final product also. Non-availability of an acceptable process to decontaminate peanuts and bring down the aflatoxin content to safe levels is a constraint coming in the way of development of this agricultural crop, competing effectively against soybean, considered its rival in the international market. While decorticated nut is a versatile food material for humans both for direct consumption as well as for providing edible oil, the protein rich deoiled residues are much sought after as an ingredient for animal feeds. In contrast soybean is mostly used for oil extraction, soy flour and processed products based it and as a component in animal feeds.

Peanut seeds can be blanched to remove cuticles if white kernel is desired or can be roasted, boiled, fried or coated to get different consumer products. Peanut butter, a highly popular product in western countries is made by grinding decuticled and roasted kernels through a process that ensures no separation of oil during packing and storage. Nutritionally shelled peanut seeds contain good quality oil to the extent of 50% while its protein content is around 25%. Bold seeds are in good demand and hand picked bold seeds fetch premium price in the export market. In India peanuts are processed in oil mills using ghani type rotary presses, screw expellers and solvent extraction plants to recover as much oil as possible. Since oil recovery is the major goal, very little attention is paid to the quality of the deoiled residue which generally contains high levels of husk and cuticles besides other undesirable contaminants. Edible quality peanut cake can be made if the seeds are precleaned before pressing for oil and during nineteen fifties and sixties, peanut protein isolate made from the deoiled cake was touted as a concentrated protein source with 90-93% protein content. Deficiency of amino acid lysine is considered as a drawback when peanut protein isolate is compared with that from soybean. Even a milk like product was developed from the peanut 4 decades ago in India as a cheap substitute to dairy milk.

Aspergillus flavus and Aspergillus parasiticus, the two organisms that grow on moist peanut seeds containing more than 7% moisture, excrete aflatoxins of different types which if consumed have been found to cause acute hepatic necrosis, liver cirrhosis and eventually carcinoma. There are 13 different types of aflatoxins identified so far and the most potent is aflatoxin B1. Global standards do not permit aflatoxin presence in peanut or any preparations derived from it beyond 4-20 parts per billion (ppb) and unless very high precaution is taken it will not be possible to restrict the aflatoxin to the stringent standard that exists to day. However in a country like USA, aflatoxin up to 300 ppb is permitted in domestic corn for feeding beef cattle, swines and mature poultry birds. It was in 1960 that the first out break of aflatoxin poisoning was encountered in UK killing more than 1 lakh turkey poults and subsequently several such incidences were reported from different parts of the world due to feeding aflatoxin contaminated feeds.

Aflatoxins belong to the difurocoumarolactone group of chemicals with molecular weights ranging from 312 to 346 with melting points in the range of 190-299C. Neither heat processing as encountered in frying or baking nor any other known method can destroy the toxin very significantly. Toxins present in oil fraction are not affected by the conventional alkali refining process but special filtration system can remove the particulates of aflatoxin satisfactorily. Ammoniation (0.5-2% ammonia) at room temperature or at elevated temperature and pressure can bring down the toxin level considerably but whether it can be deployed commercially is not certain. Use of Flavobacterium auranatiacum bacteria to destroy aflatoxin has been found to be technically feasible but the limitation is that such biological system can work only in aqueous medium calling for expensive process technologies and long processing time. Gamma irradiation at a level of 5-20kGy dose has been reported to be effective in detoxification but limited facilities available for irradiation makes this technology impractical on a large scale.

In spite of 4 decades of scientific endeavor a satisfactory method of detoxification is still eluding the peanut industry. Preempting development of mold infection through prompt drying of the crop to less than 7% moisture, careful handling and storage at low temperature and humidity may be the best option. Use of electronic sorters to sort the seeds based on color development caused by the growth of the mold was explored without success. Considering the practical constraints in changing the prevalent agricultural practices, the best way to eliminate aflatoxin problem seems to be manual sorting of the seeds which has been accepted by many importing countries.

V.H.POTTY
http://vhpotty.blogspot.com/