T DO PHOIVG

(1)

KHOA HOC C 6 N G N G H £

AlXIH HUQIVG CIJA PHUCTIXIG P H A P B A O IVIAIMG DEiV C H A T LUQIXIG X O A I C A T H O A L O C {Mangifera indica LA S A U THU HOACH O I V H | £ T DO PHOIVG

Trdn XuAn Hidn', Ddo Van Thanh', Hd Minh Ihaoi, Hd Tudn Anh', Lfe Thj A D6iigi T6MTAT

Xoai cat Hda Lgc la loai trAi cfty cd hiû qua kinh ta' vA gii trj dinh dudng kha cao. Tuy nhidn, xoai I91 rat kho bao quan. d^ hu hdng va bi^n iV>\ clial lifcnig ni-w nhu thu hAi. vAn chuydn va bao quan khong phu hgp. Vi^c bao quan nhdni kô dai Ihm gian chin, duy tri thinh phdn dinh duftng va tang gia tn kinh t^ cho xoaj cat Hda Ldc la cdn thirt. Vi vay muc liû cua d6 lai IA khao sal phuong phip bao mang bang guargum-beewax ket hgp vdi NaOCI. I IjBO^, GA^ va KMnO^ d nhivt do phdng d^n cAr chi ti6u nhu dd cimg, miu sdc vd. ham luong saearoza, tinh bdt, axit tong so. carotin va chdt khd hda tan. Ket qua nghian cuu cho thdy, xoai duoc bao mang guargum-beewax k^t hgp voi NaOCl 1% va HjBOj 1% giii dugc giA tn cam quan cung nhu gia trj dinh duiing sau 16 ngay bao quan, cdn khi bao niAng guargum-beewax k^t hgp vdi NaOCl 1% va GAj5 ppm vatui KMnO,d5keodai then gian chin. giA tn cam quan va dinh dudng ddn 20ngay. Tr^n ca sd do dO ciing, mau sdc vd va phAn tich cac chi ticu chdt lugng bfin trong da thi^t ISp duoc mdi tuong quan theo mo hinh y= ax" + bx + c va Z = aX + bY + cX^+ dXY + eY" voi he sd R^ cao n*n cd thd du doan su thay ddi linh chat vgt ly va thanh plian hoa hgc cua xoai tlieo thoi gian tdn trur.

Tir khda: Xoai cat Hoa Ldc, mau sdc, do ciing, cbat lupng, tiidi gian tdn tru:

LDATVANDE

Ddng bdng sdng Cuu Long (DBSCL) Id viing ed tidm ndng rat ldn ve cdc loai trdi eay nhidt ddi. ngudn trdi cay ddi ddo ndy sd tao ra mdt the manh rat Idn cho viec xudt khau, gdp phan lam tang gid tri kinh te va mang lai ngudn thu nhap dang kd cho ngirdi ndng dan. Ngdy nay mdt trong nhung loai trai ciiy dupe ua chudng va cd gid tri xuat khau eao b DBSCL phai kd den xoai eat Hda Ldc {Mangifera indica L) boi huong thom tu nhidn. hdp dan khi chin vd cd gia trj dinh dudng cao. Tuy nhien ngodi nhtmg uu diem dd, xodi lai rdt khd bao qudn. d^ hu hdng vd bidn ddi chat luong nû nhu cde qud trinh thu hdi, v ^ ehuydn vd bao quan khdng phu hpp. Hi^n nay a Vidt Nam cdng nghd sau thu hoaeh trai cay ehua dupe quan tam nhiû ndn su tdn that v^ mat dinh dudng va gid trj kinh td la diû khdng thd trdnh khoi. Vi vay mue tidu cua de tdi la tim ra phuong thiic bao mdng thich hi?p nhdm ngan can, loai bo khi etylen - tac nhdn xiic tde cho qua trinh chin cua xoai eat Hda Lpe sau thu hoaeh, duy hi ehat lupng cua xodi h-ong qud trinh tdn trir d' nhiet dd phong.

L VATUpiVii PHUDNG PHAP NGHBVCUU

1. V$t U$u

Xodi cdt Hod Lpc diroc thu nhan tai cdc vuon xoai xa My Hiep (Huy^n Chg Mdi, tinh An Giang). Xoai dupe chpn nghidn cihi b dp eung dat ydu cdu cho ton tru, vdi sd ngdy tudi tir 95-115 ngay (sau khi trd ho^.

dupe thu hdi tir 8 gid sdng. Khdi lupng trai hi 450-500 gram, la nhiing trai phat tri^n binh thirong, cd kidi thudc ddng ddu (dudng kinh trai trung binh 25 cm, chidu dai trdi trung bmh 16 em), khdng cd vet tr^

xudc vd khdng bj sau b^nh, khdng bi tdn thuong co hpc.

2. Phuong phdp nghien cuu

Xodi sau khi din?c thu ho^ch cr vudn dugc dong gdi bdng thiing cde tdng vd van chuydn ve phdng thi nghidm (khdng qud 4 gid). tidn hdnh phdn loai de ehpn ra nhung trdi xodi ddng nhat ve dp chin va tien hdnh xii ly sa bd bang nudc ndng a 5PC thdi gian 1 phiit, lam nguOi nhanh trong nu6c lanh (20°C).Ti^

theo xii ly xoai vdi dung djch CaCl2 3% thdi gian 1 phut, sau cimg xoai dupe tidn hdnh xu ly bao mang' Thi nghidm dupe bd tri nhu so dd sau:

Trudng D^i hpc An Giang

^^ N 6 N G NGHlfP VA PHAT TRIEN N 6 N G T H 6 N - KV 2 - THANG 7/2012

(2)

KHOA HpC C d N G N G H |

Xoai cat Hda Loe

Lira chpn, phan loai Bao mang

0 Go Gc NJ NC 1

„ . „ L 1—I

Ho He Ao Ac I 1 \ \ \ \ 1 \ 1

Phan tich, danh gla Hinh 1. So dd bd tri thi nghidm Trong dd:

0 : Khdng xuly (ddi chung) Go: Guargum -Bee wax Ge: Guargum - Bee wax + KMnOj No: Guargum-Bee wax+NaOCl 1%

Nc: Guargum-Bee wax+NaOCI n-fKMnO^

Ho: Guargum-Bee wax+HjBOa 1%

He: Guargum-Bee wax+Hj BO3 l%+KMn04 Ao: Guargum-Bee wax +GA3 5 ppm Ac: Guargum-Bee wax+GAj 5 ppm+KMn04 3. Xirly kdt qua

Cde thi nghiem dupe bd tri hodn toan ngau nhien vdi 3 lan lap lai. Ket qua dupe thdng ke ANOVA 1 ehieu va Duncan Multiple Range Test d miie do y nghia 95% bdng phdn mdm Excel vd Stargraphies centurion XV

• . KET QDAVA THAO LUAN

1. Su thay ddi tinh chdt vat Iy cua xodi cdt Hda Lde theo thdi gian tdn trft

Cdc thi nghidm dupe bd tri hodn toan ngau nhidn vdi 3 ldn lap lai. Kdt qua dupe thdng kd ANOVA 1 chidu va Duncan Multiple Range Test b mue dp y nghia 95% bdng phdn mdm Excel va Stargraphies centurion XV.

Dd Cling cua trdi Id mdt chi tidu rdt quan trpng ddnh gia mtic dd chin cua xodi trong qud trinh tdn tiTi Ket qua thd hidn b hinh 2 cho thay, trong sudt qud trinh chin cdc phan img thuy phan protopectin thdnh pectin hda tan lam cho dd ciing trdi giam. Mau ddi chinig dp cirng cua trdi giam nhanh sau 9 ngdy tdn trii, trdi ehuyen sang trang thdi mdm nhanh chdng. Cdn mau bao mdng NaOCl va GA3 ldm iic chd qua trinh phan huy vat chat b^n trong trdi ndn da lie che su mdm trdi ndn sau 16 ngay dp ciing ciia trai giam di khodng 58%. Ddi vdi cdc mau bao mang cd tlii KMnOj dp eiing vd trai giam rdt cham va sau 20 ngdy tdn tru gia tri dp ciing ciia mau Nc va mau Gc do dupe la 457,57 g luc vd 467,54 g luc. Ngodi ra mau sdc vd trdi cung hdn quan den dp chin cua trai sau thu hoach. Khi vd xoai cd mdu xanh Id do su hien dien eua sdc td diep lue td, mtic dp giam mau xanh phu thudc vao mue dp phan hiiy didp luc td vd su tdng hpp sdc td carotin. Ket qua the hien cr hinh 3 cho thay, mau ddi chiing mdu sdc vd gidm di rat nhieu, vo trdi chuyen sang mdu vdng rat nhanh sau 9 ngay. O cdc mau bao mdng mau xanh vd trai hau nhu khdng chuyen sang mdu vdng, van giu mau tu nhien sau 13 ngdy. Cac mdu bao mang (cd KMnOJ trdi van giu dupe mdu xanh trong sudt qua trinh tdn trii Id vi chat bao mdng NaOCl vd GA3 va thudc tim da ngan can su san sinh etylen sau 20 ngay tdn trii.

Hinh 2. Su thay ddi dfy ciing cua xodi 2. Sir thay ddi thdnh phdn hda hpc ciia xodi cdt Hda LOc theo thdi gian tdn trOr

Hdm lirpng ehat khd hda tan Id mpt trong nhiing ehi tidu quan hpng dd danh gia chat lupng xoai frong qua binh tdn trii. Su gia tang ham lupng chdt khd hda tan lien quan true tiep ddn phan iing thiiy phan tinh bpt

Hinh 3. Si;r thay ddi mdu sdc vd ciia xoai va sir chuydn hda tinh bdt thanh dudng. Ket qua the hi§n a hinh 4 cho thay, mau ddi ehiing chin rat nhanh, tinh bdt gian m?nh, saearoza tang eao ndn hdm lupng chdt khd hoa tan ciing tSng theo vd dat 22.5''brix vao ngay thii 9. O cac mau bao mdng ham lupng chat khd hoa tan tiing ehdm va sau 16 ngay cdc mau dat trung

NONG NGHIEP VA PHAT TRIEN N O N G THON • KY 2 - THANG 7/2012 37

(3)

KHOA HQCCdNGNGHt

binh 12''brix. Ham Immg chfil kho h6a tan mSu bao mang (tlii KMnOJ CO Idiuynh hirong Uing chSm vi thap hoTi cdc mau chi bao mang, ham lirpng chat I<hA hoa tan a m3u Nc vi mfiu Ac dat tnmg binh 14 12"bra 6 ngay thir 20 ton trvr.

Sir thiiy phta tinh bOt thAnh du6ng h6a tan B m^t trong nhimg thay ddi Ai thiy nhii a xoai, chinh sir thiiy phan nrly ldm cho tinh bot giam. Tinh li^t trong trdi gidm do qud trinh dudng h6a, duoi Ue dung enzym n^i t^- K^t qua th^ hi^n o hinh 5 cho thSy, tinh hi/t b mSu ddi chiing tir 9,84* (ngay 2) gidm xudng cAn 0,69% 6 ngdy thil 9. Con mau bao mdng NaOCl vd GAj c6 tdc dO giam tinh bpt thap, sau 16 ngay tdn trii tinh bOt b hai miu nay c6n khodng 8,5%. RiSng mSu Nc vd Ac tinh bdt giam h djnh vd con l^ii khodng 8,5% sau 20 ngay ton trii.

Hinh 4. Sir lhay ddi hdm luong chdt khd hda tan ciia xodi

.,.

9 '^"

3 J','

.

- i

I t & 1

" h - ' i l t i K i

• 1 (

ID 11 IJ It liin trfl-. •iKl>

:a

:;•

II M

,

Hinh 5. Sir thay ddi tinh bdt ciia xodi Song song vide tinh bdt giam thi dudng tang ldn tuong ling. Ket qua the hidn b hinh 6 cho tliay, mau ddi chiing hdm lupng saearoza chidm 16,66% sau 9 ngdy tdn trii. Ddi vdi cdc mau bao mdng ham lupng saearoza tang cham, mau No va Ao dat trung binh 9,10% sau 16 ngdy tdn trii. Ridng edc mau bao mdng (cd KMnOJ lupng saearoza t ^ g cham hon rat nhidu, mau Ac sau 20 ngdy tdn trir lupng saearoza chi dat 9,32%. qua dd cho thay GA3 va KMn04 cd tae dung ngan can trai tiep xiic vdi khdng khi, lam giam qud trinh trao ddi chat, keo ddi thoi gian chin.

Sau thu hoach axit tdng sd gidm Id do eung cdp eho qud trinh hd hap va tae dung voi rupu sinh ra trong trdi dd tao thdnh este ldm trai ed miii thom d$e

Hinh 6. Sv thay ddi saearoza ciia xodi trung. Ket qua tlid hi^n b hinh 7 cho thay su thay do!

axit tdng giiia cdc mau rdt khdc nhau trong thdi gian tdn trir. Axit tdng sd mdu ddi ehiing giam rat nhanh sau 9 ngay (cdn 1^ 0.08%). Cdc mau bao mang, su bidn ddi ciia axit theo xu hudng chung Id giam ddn, den ngay thii 16 mau No vd Ao axit tdng sd con lai la 1,11% va 1.09%. Cde mdu bao mang (ed KMnO*) axit tdng sd van con b miie eao, mdu xir Iy vdi NaOCl va GA3 kdt hpp vdi tlii hdp thu khi etylen da ldm giam tdc dp hd hdp, ldm ehdm thdi ky gia chin, Idm chSm thay ddi mdu sdc trdi, ndn sau 20 ngdy ton trfl hai mdu ndy axit tdng sd vdn edn hrong ddi eao (1,0396 va 1,04%).

I?;]

f i r

| ? i :

n 1 ;:;

.

' -'.-^ y •'

• • » • ' , ' • . • ; - • ' •

' • - r ? " •

, « ' * " • I 4 « > 10 11 14 Ifi

ThAi itlan Ion t i * , tifiky

' - '.%.

> C c

*-Z

IS 10

Hinh 7. Sv thay ddi axit tdng sd cua xodi Hinh 8. Sv thay ddi carotin ctia xoii

38 N O N G N G H I E P V A PHAT TRIEN N O N G T H O N - KV 2 - THANG 7/201!

(4)

KHOA HQC C 6 N G N G H |

Trong qud trinh tdn trii xoai. chdt mdu thay ddi rd nhat khi chin la diep lue td giam, trong khi carotin ddn ddn tang dd trd thanh chat mau chinh ciia trai chin. Kdt qua thd hidn 6- hinh 8 cho thdy carotin ddu tang theo thdi gian tdn tni o tat ea cdc mau, chii ydu la xay ra d thit hdi. Mau ddi chiing carotin trong trdi tang nhanh, ddn ngay thii 9 dat 16,64 |Jg/g. Cde mau bao mang carotin tang cham, ddn ngdy thii 13 carotin b mdu Go va Ho tang len 5.23 p g / g va 4,98 pg/g.

Ridng mdu xii ly GA3 kdt hpp vdi KMnO^ carotin tang cham hon, den ngdy thii 20 ehi dat 5,16 pg/g carotin.

3. Su tuong quan giQa cdc chi tidu ehdt lupng

1),.'

g- 11.5

^ ' ' • '

" 1 '•".

~ *:«

^ c - . «

n Sfa

, .

M « 7W DO t i i - o

. ^ 0 910 iiU.Kivc

. 0 * . !

• 0

• G o

0 N i l 0 N c

• Ik

•*fc

i i s f l l u c

-

Hinh 9. Tuong quan giQa hdm lupng CK hda tan vd dd Cling b edc phirong phdp bao mdng

i 'I J -,";

1 J'"

^':.-

- "•

^ •

' ••

bSU 7 M SM V5U 1>V C f " K . U I v r

,m J.

,M 12 u

a J - V 14 i ' • "

ii: I -

£ w

»

• n - • . . ,

*

D v w i M U . B l ,

• 0 • . CH) .. INo

. . H o

' • - ' ' •••^> ' '^'

" " - J T

' ' " " • • ' - ' " " • "

Hinh 10. Tuong quan giua hdm lupng saearoza vd dd Cling b cdc phuong phdp bao mang Theo hinh 9, 10 vd 11 cho thay tuong quan giiia ham lupng chat khd hda tan. ham lupng saearoza,

Hinh 11. Tuong quan giQa hdm lupng carotin va dp Cling xodi dr edc phuong phdp bao mdng ham lupng carotin va dp ciing eua xodi Id mdi tuong quan ty Id nghich vdi nhau.

•5 I J "

s;;-:

t "••

?;:•:

i '«

* o

"--

' 1 ' ^ • ' "

W S«l <.VI 7M SSI l>J c r r i K

"

vxi Ivc

, t

.•^ = •

:!;:

-"I

VI I I M IIA<I

• f ' • - '

_ , 1 v:

S " '

a. '•"••

k ' "

* '•"'

-,'

4 . 1 . «

.' " »

*•

1>0 c i r

_^ . ,

l i . K l V « .

•

'V

" - '.°o

** 'sl

= Ho

• A t n v i ,.,Mi

Hinh 12. Tuong quan giua tinh b^t vd dp ciing b Hinh 13. Tuong quan gifia axit tdng sd vk dp cdc phuong phdp bao radng ciing b cde phirong phap bao mdng Theo hinh 12 vd 13 eho thdy su bien ddi ham lupng tinh bdt, ham lupng axit tdng sd eiia xoai tuong quan ty le thuan dp eiing trdi.

f II.0

S"' 1 11.

i ;;

_{5 M}

^ -t ' ->.*

=*,.': A / '

' ^ • , •

J", i-

TtT

7 34,8 34.» JS.0 3S.I J5.1 3S.3 3S.4 3 MAu sic ^ 6 l f i i . Kid Irj t>

"

• o

• Cn A Cc e Nc a Ilu

• Ac S.S 3S,6

.

^ 9 , '

1 ;•;;

g S.1I

^ ^^' - fi

[

y

-:•-'•'

' °'''J-

\f "-'•

• j i •=

C--

7 34.« 34.9 - ^ < • "

3MI 3-M 3 M

*&

I Ho

VJ 3S.4 J.V'

Hinh 14. Tuong quan gifia hdm lupng chdt khd Hinh 15. Tuong quan giua saearoza vd mdu hda tan vd mdu sdc vd a cde phuong phdp bao sdc v6 a cdc phuong phdp bao mdng

mdne

NONG NGHIEP VA PHAT TRIEN NONG THON - KY 2 - THANG 7/2012 ³⁹

(5)

KHOA HQC C 6 N 0 NOHfe

Hinh 16. Tuong quan giua carotin vi mdu sdc vd b cdc phuong phdp bao mdng Kdt qua the hidn a hinh 14, 15 vd 16 eho Ihdy ham lupng chdt klid hda tan, hdm lupng saearoza, ham lupng carotin eiia xoai ty 1$ thu$n vdi mdu sdc vd trdi (gid tri b)

l,MI 1

• S | , . i - c l,J^

to-l,K i3 E | i i <

. • • • [ )

\. ^ ,

r" ^ * t

r ,

J4,7 1-1,8 34.9 iya 3S.1 35.2 J5J J M Mau sac ^0 I r i i , gia trj b

. C o ) t C c D N O ' N c a Ho

• He

• 0

SW 35,*

^ . _ J

Hinh 17. Tuong quan giQa tinh bdt vd mdu sdc vd 6 cdc phuong phdp bao mdng

Hinh 18: Tirong quan gifia axit tdng s& vd mdu sdc v6 b cdc phirong phdp bao mdng Kdt qud thu nhdn 6 hinh 17 vd 18 cho thay hin lupng tinh bdt vd hdm lupng axit tdng sd trong xoai ty 1§ nghjch vdi mdu sdc vd trdi.

Di,ra vdo md hinh chung y - ax^ + bx + c voi h^ so R^ > 0,90 ed thd du doan su thay ddi thanh phdn hoa hpc theo do Cling (mdu sdc vo) cua xoai theo thoi gian tdn trir b cae phuong phdp bao mdng khdc nhau,

.;4i3-x - 3Dise3-y 0 OOOOIUllS-X-2 - 0 751IU-T-2 • OaSSIiltTt

Hinh 19. Tuong quan giiia hdm lupng chdt khd hda tan vdi d$ ciing vd mdu sdc vd trdi

0 37644rX - 4 SB0B2-Y - 0 000003Ce55S-X'2

Hinh 20. TXiong quan gifia hdm lupng do Cling vd mdu sdc vd trdi

-00I4WT3-K • 0 U e S S J f » • TMME-rXI - 0 OIBOI'V'S * ooociMOSirx^

Hinh 21. Tuong quan giOa hdm lugng tinh bdt vdi dd Cling vd mdu sdc vd trdi

Hinh 22. T\Kmg quan gifia hdm lupng axit tdng s6 v6i do ciing vd mdu sdc vd trdi

40 N 6 N G NGHlfP VA PHAT T R I I N N 6 N G T H 6 N - KV 2 - THANG 7/2012

(6)

KHOA HQC CdNG NGH|

Hinh 23. Tuong quan gitia hdm lupng carotin vdi do eiing vd mdu sde vd trdi Ket qua khao sat va phan tich hdi qui thd hidn b hinh 19, 20, 21, 22 vd 23 cho thdy c6 mdi tuong quan giua hdm lupng chat khd hda tan. axit tdng sd, saearoza, tinh bpt, carotin vdi dO eimg vd mdu sdc trdi khi xodi cat Hda Lpc dupe xii ly bao mdng tdn tru d- nhtpt dd phdng.

i

Phuong trinh tuong quan hdi quy thu nhan dupe theo md hinh Z = aX + bY + cXY + dX^ + eY^ cd dp chinh xdc cao (R^>0.99); vdi X; dd ciing ciia trdi (g lue), Y: mdu sdc vo trdi (gid tr; b); Z: thdnh phdn hda hpc. vi v|y ed thd su dung phuong trinh ndy dd du dodn su thay ddi thanh phdn hda hpc theo dp eiing vd mdu sdc xodi b ede phuong phdp bao mang.

nr.KfrLuAnivADfNGHj 1. Kdt ludn

Xodi cdt Hda LOc tidn hdnh bao mdng guargum- beewax kdt hpp xir ly trong NaOCl vd H3BO3 da keo dai thdi gian tdn trii dupe 16 ngdy va khi kdt hpp xu ly trong NaOCl, GA3 ed hii KMnO* giii dupe gid tri cam quan vd dinh dirdng ddn ngay thii 20 so vdi mau ddi chirng chi bao qudn dupe 9 ngay.

NgdyO Ngdy 2 Ngdy 4 Ngdy 6 Ngdy? Ngdy 9 Hinh 24. Mdu xodi cdt Hda LOc khdng xii ly

Ngdy 11 Ngdy 13 Ngdy 16 Ngdy 18 Ngdy 20

Hinh 25. Miu xodi cdt Hda LOc bao mdng guargum - bee wax -i- NaOCl 1% + KMn04 2. Kidn nghi

Xay dung md hinh bidn ddi chat lupng xoai cdt Hoa LOc b nhidu nhidt dO tdn tru khac nhau nhdm hodn thi^n bang mau cho vide dd xudt hudng dan lua chpn nhidt dd vd thdi gian ton trir xoai cdt Hoa LOc thieh hpp vdi timg ydu cdu khdc nhau, nhat Id nghidn ciiu hep mdt sd chi tidu dnh hudng khac nhu ty Id hu hdng, ^ 1$ hao hijt khdi lupng,... trong didi gian bao quan.

Xdy dung mo hinh ddnh gid chat lupng ede loai xodi khde sau thu ho?ich (xoai Chau Hgng Vd, xoai CatChu,...).

TAI LJ$I IHAM KHAO

1. Dd Minh Hidn, Thai Tlii Hda, Pham Hodng Lam, 2001. Anh huong eiia nhiOt dO den thdi gian bao qudn vd ehat lirpng trai xoai cdt Hda Lpc. TP.Hd Chi Minh: Nhd xudt ban Ndng nghiOp.

NdNG NGHlfP VA PHAT TRIEN N O N G THON - KV 2 • THANG 7/2012

41

(7)

KHOA HOC CdNGNGHl

2. Trdn Thi Kim Ba. 2007. Ndng cao nang sudt. Pakistan. Department of Food Teachnology.Farculty pham ehat va keo dai thdi gian tdn trii xodi cdt Hoa of Crop and Food Sciences University of Arid Loc {Mangdera indica. Var Cat Hoa Loe) bang bidn Agiculture.

phdp xu ly hda chat trudc vd sau tliu hoaeh. TP. Cdn 4 Nuzba Anjum, 2006. Effect of various Coating Tho: Dai hpc Cdn Tho. material on keeping quality of mangose {Mangiiers

3. Habib Admed Khan Rathore, 2007. Effect of indica) stored at low temperature. Department of surface coating and packaging on the keeping quality food and technology. University of Arid Agriculture, of mango {Maiigifeia indica.L). Rawanpindi. Rawalpindi, Pakistan.

EFFECT OF THE SURFACE COATING METHOD ON THE POSTHARVEST QUALTIY OF HOA LOC MANGO (Mangifera indica I.) AT ROOM TEMPERTURE

Tran Xuan Hien, Dao Van Thanh, Ho Minh TTiao, Ho Tuan Anh, Le l l i i A Dong Summary

Hoa Loc mangoes have highly nutritional and economical values. However, it is very difficult lo preserve because they will easy get spoil and change quality if they are harvested, transported and stored inappropriately. Preservation of Hoa Loc mango in order to extend npe time, maintain nutritional components and increase economical value is urgent issue. Therefore, the purposes of this study were to examine the efflciency of the use of guargum-beewax film combined with NaOCl, H3BO3, GA3 and KMnO, treatment at room temperature through measuring and analyzing the firmess, skin color, reducing sugars, saccharose, starch, total acid, carotene content and total soluble solids. Results showed that the guargum- beewax membrane associated with 1% NaOCl and 1% HjBOj treament can maintain sensory and nutritional values of mangoes up to 16 days while guargum-beewax membrane with 1% NaOCl and 5 ppm GA, and absorbent KMn04 can extend ripe period, sensory and nutntiona] values until 20 days. Based on measunng of hardness, skin color and analyzing of the inside quality standards; the correlation model y = ax^ + bx + c and Z = aX + bY + c)? + dXY + eY^ was estabhshed with the high R^ values, so they can be used to predict relatively-accurately the changes of physical properties and chemical compositions of mango wilh the storage time.

Keywords: Hoa Loc mango, color. Srmness. quality, shelf life.

NguW phan b i ^ : TS. Hodng Thi L$ Hdng Ngdy nhdn bdi: 19/4/2012

Ngdy thdng qua phdn biOn: 5/7/2012 Ngdy duyOt dang: 12/7/2012

"^2 NONG NGHIEP VA PHAT TRIEN NONG T H 6 N - KV 2 - THANG 7/2012