KHOA HQC - CONG NGHfi
TOI ini HOA MOT SO THONG SO CONG NGHE DE BAO QUAN QUA XOAI CAT HOA LOC B A N G PHlTONG PHAP KIEM SOAT KHI QUYEN
(CONTROLLED ATMOSPHERE)
Phgm Anh Tudn ', Tdng Thf Quynh Anh ^ TOM TAT
Mvc tiiu cua nghien cuu ndy id tdi iru hda chi dg cdng nghi bdo qudn qua xoai Cat Hda Lgc bdng phuong^ phdp kiim sodt khi quyin CA vdi 3 yiu l6 thuc nghi4m tuang img miin khdo sdt Id nhi4t dg (9 - 13 C), ndng dg khi O2 (2 - 5%) vd ndng dg khi CO2 (5 -10%). Ki hogch thuc nghidm gdm 9 thi nghiim lheo ma trgn Box-Wilson vdi hdm myc tieu la cdc chi tiiu chdt luang eiia qud xodi gdm diem cdm quan, dg cung qud.^ hdm luang dudng tdng s6 va ham lugng axit long s6. Tiin hdnh ddng th&i cd 9 ihi nghi4m trin h?
thdnq thiit bj CA da chuc nang cd thi diiu khiin vd gidm sal lu dgng dugc nhiit dg, dg dm, ndng dg khi O2 vd ndng dg khi COj. Kit qud da xdc djnh duac gid tri idi uu cUa cdc yiu td nhiit dg la 9, fC, nong dg khi O2 4,7% vd non^ dg khi CO2 5,0%, Cde hdm muc tiiu tuang ung dgt dugc sau 30 ngdy bda qudn Id chdt luang cdm quan xip logi khd (17,1 diim), dg cung qud 8,46 kG/cm', hdm luang dudng tdng sd 13,1%. hdm luang axit tdngsd 0,5%. Sau 30 ngdy bdo qudn a diiu kiin ldi uu, xodi duac chuyin sang bao gdi bdng vgt liiu PE dg ddy 0,03mm va bdo qudn dip tue & nhiit do 9,5± 0,5''C. Kit qua sau 7 ngdy bdo qudn, chdt lugng cdm quan dot 17,8 diem, trong do diem vi mdu sdc, miti, vi duac cdi thiin hem, trong khi chi liiu trang thdi co hi suy gidm so vdi mdu ldi iru.
Tu- khda: Bdo qudn, kiem soai khi quyen, tdi uu hda, xodi Cdi Hda Lge.
OPTIMIZING OF TECHNOLOGICAL PARAMETERS FOR "CAT HOA LOC" MANGO PRESERVATION BY USING CONTROLLED ATMOSPHERE PACKAGING
Pham Anh Tuin ', Tong Thj Quynh Anh ^ SUMMARY
The objective of this study is to optimize the preservation of 'Cat Hoa Loc' mango by controlled atmosphere (CA) method with 3 corresponding factors with domain survey: temperature (9 - ]3''C), O2 concentrations (2-5%) and CO2 concentrations (5-10%). Plan 9 laboratory experiments include the Box - Wilson matrix with the objective function as indicators of the quality of mango which the observation, firmness, total sugar content and total acid content. Nine conducting experiments simultaneously on the multifunctional CA system can be controlled and monitored automatically about temperature, humidity, concentration of O2 and CO2 concentration. The results identified the optimal value ofthe temperature is 9.5 °C, 4.7% O2 concentration and CO2 concentration 5.0%. The corresponding objective function achieved after 30 days of storage the organoleptic quality graded fairly (17.1 points), 8,46 kG/cm^ hardness, the sugar content of 13.1%, total acid content of 0.5%. After 30 days of storage at optimal conditions, the mango was transferred to PE packaging material thickness of 0.03 mm and stored at temperatures 9.5 ± 0.5 "C. Results after 7 days of storage, the perceptible quality 17.8 points, including points of color, smell, taste are improved, while the status indicator has been declining over the optimal form.
Keywords: Preservation, controlled atmosphere, optimize, 'Cat Hoa Loc' mango I. D A T VAN D E
Cdng nghe bao quan bang kiem soat khi bien nhu qua xoai, do ed the lie chl dugc cuong quyln CA la mgt trong nhiing phuang phap vat do hd hap, mat khac cdn ban che dugc su phat Iy an toan va cd hieu qua ddi voi rau qua tuoi, trien cua vi sinh vat gay thdi hdng.
dac biet la nhirng loai cd dae tinh hd h i p dot Nhin chung cac ket qua nghien ciiu [4,5,6]
cho thay, ndng dg khi O2 va CO2 trong mdi ' TS.Vi^n CO dien nong nghi?pvA cong nghe STH. trucmg CO anh hudng dang k l den chit luone
^ KS. Tnrcmg D?i hpc NQng Iam Hue.
TAP CHf CONG NGHIEP NONG THON - SO 10 - 2013 29
5"
KHOA HOC - CONG NGH?
qua xoai trong qua trinh bao quan thdng qua cac chi tieu danh gia ve dg ciing va mau sac cam quan. Cu thl, vai nlng do khi O2 thap tir (3 - 5%) va ndng do CO2 cao tir (5 - 10%) co xu hudng keo dai thcri gian bao quan, d mdi truong nhiet dp tii (8 - IS^'C). Tai Viet Nam chua cd nghien cuu nao v6 cdng ngh? bao quan bang CA dugc thuc hien mdt each ddy dii. Muc tieu cua nghien ciiu nay la tdi uu hda 3 yeu td anh hudng chinh gdm nhiSt do, ndng do khi O2 va ndng dp khi CO2 den chat lugng va thdi gian bao quan, day la budfc ke tiep cua chudi cac nghien ciiu khao sat da dugc thue hien, nhim hoan thien quy trinh edng nghe bao quan qua xoai Cat Hda Ldc bang phuong phap CA.
n . NGUYEN L i f u VA FHU'OfNG PHAP NGHIEN CUtJ
2.1. Nguyen lieu
Qua xoai Cat Hda Lge xuit xii xa Hda Hung, huyen Cai Be, tinh Tiln Giang, Viet Nam. Thu hoach d do tudi tu 70 - 80 ngay. Vu thu hoach tii thang 3 din thang 5 duge chgn nhiing qua con eiing, cSu tnic thit qua rin chie, mau sac vo qua cdn xanh tu nhien.
2.2. Phu-ffng phap nghien cihi 2.2.}. Thiet bi su dung
Ifinh 1, H? thong thiit bi thi nghi4m CA da chdc nang He thdng thilt bi thi nghiem CA da chiic nang (hinh 1) voi 10 kho cd dung tich 90 lit/kho, ttong dd gdm 09 kho CA, cd thl dilu khiln giam sat ddc lap dugc 4 thdng sd la nhiet do, do im, ndng dg khi O2, ndng do khi CO2 va hiln thi giam sat canh bao ndng do khi Etiiylene; 01 kho chi dilu khiln dugc 2 thdng sd nhiet do va dd am voi nhiem vg lim miu ddi 30
chiing. Cac kho dugc thiet kS cd gioSng ciia kin chuySn dyng vdri kinh each nhi?t 2 lop co thl quan sat mau thi nghi$m tu ben ngoai.
cac CO cdu chap hanh diSu chinh khi thilt kl hoan toan tu dgng dilu khiln giam sat bang hg PLC kit ndi may tinh trung tam, cd till cap nh|t, luu trii va in an so li?u nhat ky thi nghiem. Cac Sensor cam biln (O2, CO2, C2H4) ciia HSng Detcon - USA, tin hi^u chuan tii 4 - 20mA.
2.2.2. Phuangphdp bo tri thuc nghiem Tien hanh thuc nghi$m theo ma tran Box-Wilson gdm 9 thi nghigm CTj, CT2. CT3.
CT4. CT5, CT6. CT7. CTg. CT9 vdi 3 ylu tl tuong ling mien bien thien la kit qua ciia nghien ciiu don yeu td da dugc thuc hien trudc:
Xl- Nhiet do (9 -1 S^'C); X2 - ndng do khi O2 (2- 5%); X3 - ndng dg khi CO2 ( 5 - 10%). Cac ham muc tieu gdm Yi cam quan (dilm); Y2 dg ciing (kG/em^);Y3 ham lugng duorng tdng sd (%); Y4 ham lugng axit tdng sd (%).
- Chuan bj mau: tidn hanh so chl va xii ly nguyen lieu bing loai bd nhung qua bi tin thuang, xay xuac, dap nat do qua trinh van chuyln va nhung qua bi benh. Cit cudng dai 1cm va rua sach bing nuac, tilp theo xii ly nhiet bang nhiing nuoc ndng 52''C vai thdi gian 5 phiit, lam khd va dinh lugng 5kg/mau x 9 miu va 1 mau ddi chung (DC) a dilu kien lanh 1 l"C khdng dilu chinh khi CA.
2.2.3. Phmngi^i^phdntichddnhffddi^hmng - Phuang phap lay mau qua tuoi: theo TCVN 5120-90.
- Danh gia chat lugng cam quan bing lap Hdi ddng chim dilm: 4 chi tidu cam quan: mau sac, mCii, vj, ttang thai dugc danh gia rieng re theo thang 5 dilm, dilm cao nhit la 5, dilm tiiip nhit la 1 (TCVN 3218:2011). Tuong iing he sd quan ttgng: Mau sic (1,2), miii (0,8), vj (0,8), ti^g thai (1,2). Miic xep loai theo tdng dilm: tdt (18,2 - 20); kha (15,2 -18,1); ttung binh (11,2 - 15,1);kem (7,2-11,1); hdng<7,1. [1,3].
- Xac dinh do ciing: bing may FT327 (Italia).
TAP CHI CONG NGHIEP NONG THON - SO 10 - 2013
K H O A H Q C - C O N G N G H f - Xae djnh ham lugng dudmg tdng sd: theo
TCVN 4594-88
- Xac djnh d$ axit: theo TCVN 5483-91 2.2.4. Phucmg phdp xu ly s6 lieu Sii dung phan mem Design - Expertversion de xir ly so lieu thgc nghiem da y l u td va tdi uu md hinh thgc nghiem theo thuat toan ham mong dgi.
I I I . K £ T Q U A VA T H A O LU-^N 3.1. Ket q u a k h a o sat a n h hv&ng cua nhift do, nong dg khi O2, n&ng dg khi CO2 den chat l u v n g cua q u a xo&i C a t Hoa Lgc
Tdng hgp sd lieu vdi cac gia tri thuc ciia cac yeu td thuc nghifm dugc ma hda (bang 1)
Bdng 1. Tong hgp so li^u thi nghiem da yiu td
CTI CT2 CT3 CT4 CT5 CT6 CT7 CT8 CT9
Xi
-1 -1 -1 -1 +1 +1 +1 +1 0
X ,
-1 -1 +1 +1 -1 -1 +1 +1 0
X J
-1 +1 -1 +1 -I +1 -1 +1 0
Y ,
13,7 14,6 16,2 15,1 13,6 13,1 14,2 12,2 17,1
Yi
4,60 5,20 8,95 6,40 4,55 4,05 6,37 2,47 5,85
Y J
14,12 13,29 12,52 13,64 14,89 15,28 13,41 15,88 14,81
Y ,
0,31 0,41 0,53 0,45 0,37 0,33 0,49 0,28 0,39
Bieu diln quan h? giiia cac yeu td thuc nghi?m d i n chat lugng cam quan (hinh 2a, hinh 2b, hinh 2c).
ITinh 2a. Anh hu&ng cua nhi4t do vd ndng dg khi O2 din chdt lugng cdm quan
Hinh 2b. Anh hu&ng cua nhiit dg vd ndng do khi CO2 den chal lugng cdm quan
Tien hanh xii Iy sd lieu bang phan mem Design - Expert vdi cac buoc Iua chgn md hinh tuang ling cac bien va cac muc tieu yeu eau, chgn bac ciia ham muc tieu phii hgp, kiem tta su cd nghla cua cac he sd bdi quy va su tuong thich cua md hinh thyc nghiem. Ket qua da xac dinh dugc 04 phuong trinh hdi quy Yi (1), Y2 (2), Y3 (3), Y4 (4) tuong ling cac ham muc tieu v l d i l m cam quan, do ciing, ham Iugng dudng tdng sd va ham Iugng axit tdng sd.
Sau day la ket qua khao sat cac yeu td thuc nghiem d i n cac ham muc tieu:
3.1.1. Anh huang cua nhiet do, nong do khi O2 vd CO2 ^^n chdt luang cdm quan.
Y| = 17,1 - 0,76X, + 0,39 X^ - 0,39 X3 - 0,36 XjX;
- 0.34 X,X3-0,49X2X3-2,96X1= (1)
Hinh 2c. Anh hu&ng cua ndng do khi O2 vd CO2 den chdt luang cdm quan Tu phuong trinh hdi quy (1) thdng qua eac he sd hdi quy cho thay cac yeu td thuc nghiem deu anh huang dang ke den chat Iugng cam quan cua qua xoai.Trong do anh hudng ldn nhit la yeu td nhiet do, tiep den la ndng do khi CO2 va anh hudng it nhat la ndng do khi O2.
Khao sat su bien thien ciia cac yeu to d i n chit lugng cam quan tren dd thj 2D (hinh 2a, TAP CHf CONG NGHIEP NONG THON - SO 10 - 2013
K H O A HQC - CONG N G H f hinh 2b) cho thay: ttong khoang nhiet dg cao
>12 C, diem cam quan giam dang kd, chiing td ring cd su gia tang cudng dg hd hap dan den s\r biln ddi nhanh vd mau sic, miii, vi va ciu tnic cua qua. Mat khac, khi nhidt do thip < 9,5''C eiing lam gidm diem cam quan, dieu nay cd the giai thich do qua ttinh rdi lo^n sinh ly a nhiet dp thap dan den s\r bien ddi vd cau tnic, mau sic qua hay cdn ggi la hien tugng "tdn thuang lanh".
Mat khac khi co dinh nhiet dg tai tam la ll^C (hinh 2e) diem cam quan cd xu hudng tang theo chieu tang ciia nong dd khi O2 va giam ndng dp khi CO2. Trong do, diem cam quan cd xu huang dugc cai thien khi nong dd khi O2 >3,5% va ndng do khi C62 <7,5%.
3.L2. Anh hudng cua nhiet do, ndng do khi O2 vd CO2 den do cung qud.
Yi = 5,85 - 0,96Xi + 0,72 X2 - 0,79 X3 - 0,66X,X2 - 031X1X3 - 0,82X2X3 - 0,53 X,^ (2)
Bieu dien quan h$ gifia cac y l u td thuc ngbiem den do eiing cua qua xoai Cat Hda Ldc (hmh 3a, hinh 3b, hinh 3c).
Hinh 3a. Anh hudng cua nhiit do vd ndng do khi O2 din dg ciing
r
Hinh 3b. Anh hu&ng ciia nhi^t do vd nong dg khi CO2 din do cung
32 TAP
Hinh 3c. Anh hu&ng cUa ndng dg khi O2 vd CO2 din dg cung
Thdng qua he sd hdi quy (2) cho thiy cac yeu td thyc nghiem deu cd anh hudng dang kl den do Cling cua (jua, ttong dd anh hudng ldn nhat la nhiet do, tiep den la n l n g do khi CO2 va ndng dg khi O2.
Khao sat sy bien thien ciia cac yeu to din dg Cling Ciia qua xoai ttdn dd thi 2D cho thiy:
do Cling cd xu hudng tang dan theo chidu giam nhiet dd ttong mien khao sat tii 9 -13*'C. Khi cd dinh nhiet do o 11°C dg cfing cd xu hudng tSng a muc cao tfi 7,11 - 7,65 kG/cm^, tuong iing vdi mfic ndng do khi O2 > 3,5% va nlng dp khi CO2 < 6,25%. Dieu nay chfing td anh hudng ciia ndng dd khi O2 cao va ndng do khi CO2 thSp den miic do tdn thuomg lanh d nhiet dd thap dan den sy bien ddi ve cau tnic ciia qua.
Qua do ciing cho thiy cd t h l dilu chinh nhiet dg bao quan 6 mfic thdp han ma van tranh dugc hien tugng tdn thuang Ianh bing each dilu chinh n^ng dg khi O2 thip hon, ddng thdi vdi ndng dg khi CO2 cao han.
3.1.3. Anh hudng ciia nhi^t do, nSngdokhi O2 vd CO2 den hdm lucmg dudmg tong so.
Y3 = 14,81+ 0,74X1 - 0,27X2 + 039X3 + 0,046X,X2 + 032X1X3+0,5X2X3- 0,68X,^ (3)
Bilu diln quan h$ gifia cac ylu td thuc nghiem den ham Iugng duorng tdng s6 (hinh 4a, hinh 4b, hinh 4c).
Thdng qua he s6 hdi quy (3) cho thiy cac yeu to thyc nghidm d i u cd dnh huong ddng kl den h i m Iugng ducmg tdng sd ciia qua xoii Cat Hda Ldc, ttong do anh huong \dn nhit la ylu td nhiet do, tilp den la ndng do khi CO2 va ndng do khi O2.
CHf CONG NGHIEP NONG THON • SO 10 - 2013
KHOA HQC - CONG NGHE
't 4a. Anh humg cua nhiet do va nong do khi O2 den hdm lu^g duang tong s6
i 4b. Anh hicang ciia nhiit do vd nong do khi COi den hdm lirong dudng tong s6
i& khi O2 trong khoang < 2,75%. DiSu nay la hoan toan phu hop 6 giai doan cu6i cua qua xoai (ngay bao quan thii 30) khi do qua trinh chuySn hoa tinh bot thanh dirong co t6c dg cham dto, tuong iing mile tieu hao khi O2 a miic thSp < 2,75%. M5t khac khi n6ng khi CO2 6 miic eao > 7,85% co xu huong kiSm ham qua trinh ho hap la phu hop voi t6e do chuySn hoa.
Nguoc lai khi ndng do khi O2 > 2,75% va n6ng dp khi CO2 < 7,85%i lai eo xu huong giam ham lugng duong tdng so, diSu nay chiing to ring su gia tang cua cuong do ho h i p manh hon, khi do nhiSu phan img chuySn hoa khac xay ra lam tiSu hao nhiSu hon eac hgp chit hOu co cua qua xoai trong do co ducmg.
3.1.4. Anh hudng cua nhiet do, ndng do khi 02 vd C02 den hdm luang axit tong s6.
Y, = 039 - 0,029X| + 0,041X2 - 0,029Xj -0,024X|X2
• 0,034X1X3-0,044X2X3 - 0,00625X|' (4) BiSu diSn quan hS giira cac ySu t6 thuc nghiSm den ham lugng axh tdng s6 (hinh 5a, hlnh 5b, hinh 5c).
Hinh 4c. Anh hirang cuu nong do khi O2 va CO2 den hdm luang dudng long so Khao sat sir bien thiSn cua cae yeu to den ham iugng duong tong so dugc bieu diln trSn d6 thi va quan sat thay; trong khoang nhiet do tir 9 - 13°C, ham lugng duong tdng s6 tang din theo chiSu tang ciia nhiet do diSu nay la phii hgp voi xu huong gia tang toe do chuySn hoa tir tinh bgt thanh ducmg. Khi c6 dinh nhiet do 11°C tai tam ciia miSn khao sat, thi ham lugng duong tfing so co xu hucmg tang theo chieu tang cua nong dg khi CO2 trong khoang
> 7,85% va nguge lai theo chiSu giam ciia n6ng
Hinh Sa. Anh huang cua nhiet do vd ndng do khi O2 den hdm luang axit long so
\.
Hinh 5h. Anh hu&ng cua nhiit do vd ndng do khi CO2 den hdm luang axil tdng so TAP CHi CONG NGHIEP NONG THON - SO 10 - 2013 33
K H O A H Q C - C O N G N G H E
Hinh Sc. Anh hu&ng cua ndng do khi O2 vd CO2 din hdm luang axit idng s6 Thdng qua he s6 hdi quy (4) cho thiy eae ylu td thuc nghiem ddu cd anh hudng dang ke den ham lugng axit tdng sd cua qua xoai Cat Hoa Ldc, ttong do anh huang lon nhat la yeu td nhiet do, tilp d i n la ndng do khi CO2 va ndng do khi O2.
Khao sat sy biln thien ciia cac yeu td den bam lugng axit tdng sd bang bieu dien tten dd thi va quan sat thay: khi cd dinh ndng dd khi CO2 tai didm tam la 7,5%, hoac ndng do khi O2 tai tam la 3,5% thi ham lugng axit tdng sd co xu hudng giam din theo chieu tang ciia nhiet do bao quan trong mien khao sat tfi 9 -13*'C.
Dilu nay la phu hgp vdi qua trinh bien ddi hda sinh cua qua xoai ttong qua trinh bao quan, tuy nhien de duy tri ham lugng axit tdng sd d muc cao, ddng nghia voi viec keo dai thai gian bao quan qua xoai d dieu kien nhiet do thap. Xet cu the khi cd dinh nhiet dg t^i 11 "C de duy tri ham lugng axit tdng sd d mfic cao tu 0,39 - 0,48%
thi can dieu chinh ndng do khi O2 > 2,75%, tuong ling ndng do khi CO2 < 8,75%.
3.2. Ket qua toi iru hoa che do bao quan xoai Cat Hoa Loc
Tdi uu hda bang phan mem xfi ly Design - Expertversion tten nguydn tac chap cac muc tieu thda man dieu kien rang bugc, cu the:
Ddi vdi 3 yeu td thyc nghiem mong mudn dat dugc gia tri trong mien bien thien da dugc khao sat:
Nhiet do (9 - 13°C); ndng dd khi O2 (2 - 5%); ndng do khi CO2 (5 - 10%), tuong ung chpn he sd quan ttgng ciia 3 yeu td (5,5,5).
Doi vdi cac ham muc tieu mong mudn dugc:
chat lugng cam quan d^t gia tii Max ttong miln (15,2 - 17,1 dilm); dg cung mong mudn dat gia tii Max ttong khoang (6 - 8,95 kG/cm^); ham Iugng dudng tdng so mong mudn dat gia tri Min trong khoang (13 -15,88%); ham lugng axit ting sd mong mudn nim trong khoang (0,4 - 0,5%), tuong fing chgn h? so quan ttgng cua 4 hkn myc tieu (5,5, 5,5).
Ket qua chaty sd lieu da dua ra 31 phuang an da xac dinh dugc 11 phuang an co muc tieu chung > 96%, trong dd phuang an tdi uu vdi myc tieu chung cao nhat la 96,3% (hinh 6)
Hinh 6. Bieu dien mde mong dgi dgi dugc cua phuang dn tdi uu
Kit qua tdi uu dat dugc vdi: Nhiet do bao quan 9,5*'C, ndng do khi O2 4,7%, ndng do khi CO2 5%; chit lugng cam quan 17,1 diem; dO cfing 8,46 kG/cm^; ham Iugng duong tdng so 13,1%; ham lugng axit tdng sd 0,5%.
Ket qua nay la tucmg ddi phu hgp vdi cac nghiSn cfiu ddi vdi qua xoai Florida [6] va qua xoai xanh Namdokmai [4,5] vd quy luat bien thien cua ndng do khi O2 va CO2 co tac ddng din chat lugng va thdi gian bao quan qua xoai. Tuy vay kha nang tdn thuong lanh cua qua xom Cat Hda Ldc a nhiet dO cao hon so vdi qua xoai xanh Namdokmai Thai Lan.
Ket qua danh gia vdi mau ddi chfing (DC) d dieu kien lanh sau 20 ngay bao quan, tuong fing cac chi tidu chit lugng cam quan 9,1 diem, dg cfing 2,7 kG/cm^, ham Iugng dudng tdng sd 17,16%, ham lugng axit tdng sd 0,6%. Trong khi ket qiia bao quan cung vdi qua xoai Cat Hda Lpc bang cdng nghe phu mang 6 diSu kien thudng dugc 12 ngay, so voi m i u xoai d khdng bao mang chi bao quan dugc tfi 5 - 7 ngay [2\
CHf CONG NGHIEP NONG THON - SO 10 - 2013
K H O A H Q C - C O N G NGH^
Qua do cho thiy cong ngh§ bao quan bang CA khong nhung keo dai thdi gian bao quan ma cdn tri hoan dang ke sy bien ddi ve chat lugng ciia qua xoai Cat HoaLoc. Tu ket qua toi uu sau 30 ngay bao quan, mau xoai Cat Hoa LOc tiep tuc dugc khao sat trong dilu ki^n bao gdi vdi vat li$u PE dg day 0,03mm va bao quan d nhi$t dg 9,5± CS^C. Kit qua sau 7 ngay bao quan, chat Iugng cam quan dat 17,8 diem, trong do cac chi ti§u v l mau sic, mui, vi dugc cai thien hon, trong khi chi tieu ttang thai co bi suy giam so voi mau toi uu, dilu nay chiing to rang qua trinh chin ciia qua xoai van dien ra ty nhi€n va dam bao chit lugng thuong mai.
l y . KET L U ^ N
Ket qua budc diu sau 30 ngay bao quan qua xoai Cat Hda LQC bing phuong phap kiem soat khi quyen CA, da xac dinh dugc cac thong sd toi uu cy the vdi: Nhi?t do 9,5''C; nlng do khi O2 4,7%; nong dp khi CO2 5,0%, tuong fing cac chi tieu chat lugng dat dugc ve cam quan 17,1 dilm; do ciing 8,46 kG/cm^; ham lugng dudng tdng s6 13,1%; ham lugng axit tdng so 0,5%. Kha nang duy tri dirge chat lugng thuang mai ciia qua xoai Cat Hoa Loc sau qua trinh bao quan bing CA cd the dugc tu 7-10 ngay ttong dilu ki?n bao gdi.
TAI LIEU THAM K H A O 1. Nguyfin Hoing DOng {2005): Giio trinh th\rc hanh danh gii cam quan. Tnr&ng D^ii hpc Bach khoa • Thanh pho Ho Chf Minh.
2. Nguyin Duy Lam (2010), "Nghien ciru vi img dyng cong ngh§ vk ihiSt bj san xuit chS phim bao quan dung trong bao quan m$t s6 rau qua tirai", Bao cao tong ket de tai cap Nha nudcKC07.04/06-IO.
3. Hi Duyen Tu (2006); Quan ly chil lugmg trong c6ng nghifip thyc phSm; Nhi xuit ban Khoa hpc vi Ky thu^t. Hi NOi.
4. Jammaree Singkaew and Sinchai Kanlayanarat (2009), Effect of hight C02 atmospheres on fruit quality and shelf life of "Namdokmai" mango (Magifera Indical.) at chilling and nonchiliing temperatures. Division of Poslharvest Technology, School of Bioresource and Technology King Mongkut's University of Technology Thonburi , Thungru, Bangkok 10140, Thailand.
5. Nattamon Somsak and Sinchai Kanlayanarat (2009), Effect of low oxygen atmospheres on fruit quality and shelf life of "Namdokmai" mango (Magifera Indical.) at chilling and nonchiliing temperatures. Division of Postharvest Technology, School of Bioresource and Technology King Mongkut's University of Technology Thonburi, Thungru, Bangkok 10140, Thailand.
'' 6. Slaughter D.C. (2009), Biological and Agricultural
^ Engineering, University of California, Davis, January.
KET QUA NGHIEN CUU CONG NGHE VA CHE TAO THIET Bj DIET MEN CHE XANH B A N G VI SONG NANG SUAT 45-80 KG CHE Blip TUUl/Gid
( Tiip theo trang 28 ) Ben canh nhOng mi dilm, thiet bi diet men bang vi sdng con c6 nhugc diem d6 la gia Ihiet bi con cao, nang suat thiet bi thap.
IV. KET LUAN
1. Da dira ra dugc quy trinh cong ngh? diet men che xanh bang vi song, theo dd tlidi gian diet men 4 - 5 phut, nhiet dO khoi che trong buong diet men 84''C ± 2''C, do am che sau khi diet men 59 - 61,6%.
2. Da thiet kl, chl tao dugc a trong nuac thiet bi di?t men bang vi song. Thiet bi hoat dong on dmh, hien thj va tir dong dieu khien nhiet do diet men. Chat lugng cua thiet bj diet men bang vi song che tao trong nudc tuong ducmg vdi thiet bi ciing loai ciia Tmng Quoc nhung gia thanh thap hon 15%.
3. Che diet men b^ng cong nghe vi song cho chit Iugng cao hon diet men bang cong nghe truyen thing. Dac biet san pham giu dugc mau xanh tu nhien ciia nguyen lieu, nudc trong sang khong cd can, van due.
TAI LIEU THAM KHAO
1. Trinh Chit, Le VSn Uyfin. Tinh loan thiet kfi hfi din dgngcakhi.NXBGiSoDyc, 1999.
2. Ton Thit Mmh. Miy va thifit b) v ^ chuyfin v i Dinh lu<;mg. D^ii hoc Bach Khoa Hi npi, 2000
3. Ton Thit Mmh TruySn nhifit vi thifit bi trao d6i nhifit. Dgi hpc Bich Khoa Hi ngi, 2003.
4. Dinh Gia Titdng, Ta Khinh Lam. Nguyen ly may.
NXB Khoa hpc vi Ky thugt, 1995.
5. H6 Le Vifin. Giio Irinh Cosotinh loin cacmayhoichSlvi lh;;c phim. Dai hpc Bich Khoa Hi npi, 1997.
6. YU, YongWANG, Zi-MingWANG, Yu-Tang(Ll, Tie- ChunCHENG, Jian-Hua LIU, Zhong-YingZHANG, Han-Qi,
"Non-polar Solvent Microwave-Assisted Extraction of VolatiieConstituents from Dried Zingiber Officinale Rose.", Chinese Journal of Chemistry, 2007.25,346—350
7. Ziming Wang & Lu Wang & Tiechun Li & Xin Zhou & Lan Ding &, Yong Yu & Aimin Yu & Hanqi Zhang, Rapid analysis of the essential oils from dried Illicium vcrumHook. f and Zingiber officinale Rose, by improved solvent-free microwitve cMraclion with three types of microwave-absorption medium. Received: 18 April 2006 / Revised; 20 July 2006 / Accepted; 15 August 2006 / Published online: 19 September 2006# Springer-Verlag 2006
Ngay nh?n bai: 15/10/2013 Ngay nhan bai: 5/10/2013 Ngay phin bi^n: 28/10/2013 Ngay phan bi?n: 20/10/2013 ^
Ngucri phan bi?n: TS. Doan Xuan Thin, Hoi co khi Ngiroi phan bi?n: TS. Nguyin VSn Doan, Vi?n co nong nghi?p Viet Nam. dien Nong nghiep & Cong nghe sau thu hoach.
TAP CHI CONG NGHIEP NONG THON - SO 10 - 2013 35
