Vấn đề sử dụng hóa chất để giữ trắng cho dừa

Van dl suf dting koa c^

« TS. NGUYEN THUAN ANH

Trdi dfla khi lot ldp vd mdu xanh sfi nhanh

ehdng hi den do mu nhfla hi oxy hda. De nhflng

qua dfla sau khi gpt bd ldp vd ngodi ma vdn

gifl dflpc mau tring, ngfldi ban da sfl dung chit natri

bisulfit (NaHSOa) hay natri sulfit (Na^SOa) pha loang

vdi nflde de ngdm,

Nhiing trai dfla da dfloc gpt hd ldp vd ngoai vd cd

ldp vd trdng mult lap tfle dfldc ngfldi tifiu dung dac

bifit fla chudng bdi ve hat mit be ngoai va ca sfl tien

dung vi chi d n d t nhe Id ngfldi dung cd the thfldng

thfle ngay. Ngddi tifiu dung ludn ed xu hfldng chpn lfla

cac san pham cd hinh thfle bat mit, vi ngodi ngon -

bo - re thi hinh thfle ben ngodi cung rit quan trpng

va la ye'u to' tac dfing, chi phd'i sfl chpn lfla san pham

eua ngfldi tieu diJng. Chinh dilu nay da quye't dinh

dfi'n sfl ton tai cua nhiing trai dfla cd ngdm hda chd't

de gifl tring.

Theo thdng tfl 27/2012/TT-BYT cua Bp Y tl,

Na2S03 (natri sulfit) va natri bisulfit (NaHSOg) thudc

nhdm sulfit, cd chflc nang bdo quan, chfi'ng oxy hda,

tay mau, xfl ly bfit va dfldc phep sfl dung trong thfle

phim nhifng vdi Ifldng hgn ehfi', nfi'u hdm lflpng

Na2S03 vfldt mfle eho phep se anh hfldng rit nhilu

de'n sflc khde,

Na2S0a vdo cd the con ngfldi qua dfldng tifiu hda

vdi lilu Ifldng vddt mflc cho phep se gay kfch flng tifiu

hda vdi trifu ehflng dau bung, huln ndn, tifiu chay.

Na2S03 edn ed khd nang gay anh hddng he thin kinh

vgn dfing va trung ddng, hf hfi hip, he tim mgeh;

thfldng xuyfin tifi'p xde Na2S03 cd nguy cd gdy vifim

da di flng, viem phoi, thay doi kha nang cam nhgn

mui vi, anh hfldng dfi'n tuy xfldng.

Vdi thfle trang hda chd't thfle pham (dfldc phep

dung trong thfle pham) ed gid thanh eao gd'p vdi chuc

lan so vdi hda chd't cdng nghifip, ngfldi ta thfldng sfl

dung hda cha't cfing nghifip re tien de dung trong che'

bie'n, blo quan thfle pham nhdm thu vl ldi nhudn

cao. Dang lo nggi Id khfing it ngddi bdn vi thifi'u hieu

bifi't, ldm theo kinh nghiem, truyen t£u nhau hogc vi

ldi nhugn dd dung cha't tay trang cdng nghifip dl tay

trang rau eu, dfla tfldi. Vife ndy se gay ddc hai cho

ngddi sfl dung.

Dfi'i vdi qua dfla, ldp vd cflng d ngoai khfing thd'm

nflde nhflng ldp cui dfla lai hut nflde va cd hda chit

nfin khi dung dao chat ldp vd cflng dfla dl uing,

Na2S03 cung cd nguy ed ngam vao trong tai v\ tri

chdt. Hdn the' nfla, d dau cud'ng qud dfla cd hai cdi

Cixdt diia xong, uong ngay Id cddi diing an todn nhat

mdt mam eo ldp vd rat mdng, chl can dung ong hiit

thoi dam cung thung. Vi vay trong qud trinh ngam,

NaiSOg CO kha nang tham vao bfin trong trai difa.

Ngoai dfla gpt vd ra thi cac thdc pham khac nhif

cu sen, hoa chud'i . da dddc bao, thai sdi de tao tinh

tifin dung cho ngddi tieu dung cung thfldng bi tham

den sau khi ddpc bao, thai. De gifl cho cdc san pham

nay cd mau trdng dep ngfldi bdn da sfl dung cha't natri

bisulfit hay natn sulfit pha loang vdi nddc de ngam

gifl trdng tddng tfl nhfl da lam dd'i vdi dfla.

Ngddi tieu diJng can ndm dfldc van de nhd sau: Cii

sen, hoa chud'i, dfla tfldi khi dd bdo, cdt vd thi se co

mau thdm den, vang ndu do chat polyphenol bi oxy

hda chfl khdng the cd mau trdng tinh. Vi vgy neu san

pham da dddc cat ra tfl lau md van cd mau trdng tinh

la chle chan da dfldc ngam hda chat, Mau tham den

nay chi lam giam gia tri cam quan cua san phara chif

khdng he anh hddng gi de'n gid tri dinh dddng. Vi vay

de dam bao sflc khde thi khfing nen qud chu trpng

vao hinh tbflc trdng dep cua san pham ma quen di

nhflng rui ro ma nd mang lai. Tot nhat, nen mua hoa

chuo'i, cu sen, sa cay, dfla nguyen trai.,, ve td got, sO

che. Ne'u mudn mua cac san pham da ddpc bao got

thi chi nen mua cac san pham mdi dfldc bao gpt luc

den mua, chda bi ngam hda chd't gi.

Ne'u khi an hoac uong ma phat hien tbflc pham co

dieu gi la, khac thfldng thi tuyet dfi'i khong sfl dung,

dac biet ddi vdi tre em vi he tieu hda cdn ye'u. ^

THUOC &L Si:rc KHOE so 507 (1.9,2014)